CN110498490B - Electric flocculation reactor and application thereof - Google Patents
Electric flocculation reactor and application thereof Download PDFInfo
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- CN110498490B CN110498490B CN201910816216.8A CN201910816216A CN110498490B CN 110498490 B CN110498490 B CN 110498490B CN 201910816216 A CN201910816216 A CN 201910816216A CN 110498490 B CN110498490 B CN 110498490B
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- 238000005189 flocculation Methods 0.000 title claims abstract description 69
- 230000016615 flocculation Effects 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000005273 aeration Methods 0.000 claims abstract description 68
- 239000002351 wastewater Substances 0.000 claims abstract description 59
- 238000004140 cleaning Methods 0.000 claims abstract description 32
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 30
- 230000023556 desulfurization Effects 0.000 claims abstract description 30
- 230000006698 induction Effects 0.000 claims abstract description 16
- 239000010802 sludge Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 52
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 38
- 238000006386 neutralization reaction Methods 0.000 claims description 34
- 239000002253 acid Substances 0.000 claims description 29
- 238000004062 sedimentation Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 25
- 239000003513 alkali Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009297 electrocoagulation Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 6
- 238000004065 wastewater treatment Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000012028 Fenton's reagent Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 meanwhile Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses an electric flocculation reactor, which comprises an insulating shell, a water inlet, a water outlet, a cleaning system and a sludge discharge outlet; an electrode groove is formed in the insulating shell, and is used for installing a first electrode, a second electrode and an induction electrode, and is provided with a power connection plate to be connected with a high-frequency pulse power supply; a mud bucket is arranged at the bottom of the insulating shell; an air inlet is formed in one side of the insulating shell, one end of the air inlet is connected with the electrode groove, and the other end of the air inlet is connected with an outlet of the aeration fan and used for aeration. The invention discloses application of the electric flocculation reactor. The electric flocculation reactor is applied to the treatment of desulfurization wastewater, and has the characteristics of strong shock resistance, low treatment cost, high automation degree and the like.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to an electric flocculation reactor and application thereof.
Background
Sulfur dioxide has long been listed as an important rule in China to control air pollutants, and the concentration level of sulfur dioxide in the atmosphere is used as an important index for evaluating air quality, and flue gas desulfurization is one of the most effective means for reducing emission of sulfur dioxide. For a long time, the power industry, the thermal production and supply industry are main bodies of sulfur dioxide emission in China, and the emission amount accounts for more than 50% of the total national sulfur dioxide emission, so that the industries are important industries for sulfur dioxide emission reduction, and particularly the sulfur dioxide emission reduction in the thermal power industry.
At present, the flue gas desulfurization technology is divided into three main types of wet desulfurization technology, dry desulfurization technology and semi-dry desulfurization technology according to the states of desulfurizing agents and desulfurization reaction products. By 2014, the capacity of the thermal power unit which is put into operation by adopting the limestone-gypsum wet desulfurization technology in 22 desulfurization environment-friendly companies which are included in the rank of the flue gas desulfurization industry of the thermal power plant is 504725.80MW, and the capacity of the thermal power unit accounts for 92.31% of the total unit.
Limestone-gypsum wet desulfurization in order to maintain the balance of the materials of the desulfurization unit slurry circulation system, prevent the concentration of chlorine, which is a soluble part of the flue gas, from exceeding a prescribed value and to ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system, mainly from the gypsum dewatering and cleaning system. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, and many of the impurities are first pollutants which are required to be strictly controlled in the national environmental protection standard. Because of the special quality of the desulfurization wastewater, the desulfurization wastewater treatment difficulty is high, and meanwhile, because metal ions have strong pollution to the environment, the desulfurization wastewater needs to be treated independently. At present, the desulfurization wastewater treatment process is still in the traditional three-header treatment, and the method has the problems of complex treatment process, unstable effluent quality after treatment, high treatment cost, low automation degree and the like. In view of the above, it is necessary to find a desulfurization wastewater treatment process which is impact resistant, low in cost and high in automation degree.
Disclosure of Invention
The invention aims to: the invention aims to overcome the defects of the prior art, and provides an electric flocculation reactor which is applied to the treatment of desulfurization wastewater and has the characteristics of strong shock resistance, low treatment cost and high degree of automation.
The technical scheme is as follows: the invention provides an electric flocculation reactor, which comprises an insulating shell, a water inlet, a water outlet, a cleaning system and a sludge discharge outlet, wherein the insulating shell is provided with a water inlet and a water outlet; an electrode groove is formed in the insulating shell, and is used for installing a first electrode, a second electrode and an induction electrode, and is provided with a power connection plate to be connected with a high-frequency pulse power supply; a mud bucket is arranged at the bottom of the insulating shell; an air inlet is formed in one side of the insulating shell, one end of the air inlet is connected with the electrode groove, and the other end of the air inlet is connected with an outlet of the aeration fan and used for aeration;
the water inlet is respectively connected with the electrode groove and the mud bucket through the circulating pump, the water outlet is arranged at the side part of the insulating shell opposite to the water inlet, and the mud discharge outlet is respectively connected with the insulating shell and the mud bucket and is used for discharging a very small amount of deposited flocs and preventing the short circuit of the polar plate; the cleaning system is connected with the electrode groove and is used for periodically cleaning the electrode to prevent passivation.
Preferably, the first electrode, the second electrode and the induction electrode are connected in a bipolar mode, so that the space between the electrode plates can be effectively reduced, the tank voltage and the energy consumption are reduced, and the space between the electrode plates, the current density and the quantity of the induction electrode plates can be adjusted according to the actual water quality.
Preferably, the first electrode, the second electrode and the sensing electrode are all soluble polar plates, the soluble polar plates are iron plates, a high-activity flocculating agent can be formed to remove SS and heavy metals in water, meanwhile, fenton reagent can be provided for Fenton reaction, and the output can be adjusted through high-frequency pulse power supply parameter setting.
Preferably, the aerated gas is at least one of air, oxygen and ozone.
Preferably, the cleaning liquid is at least one of clear water and weak acid cleaning liquid.
Preferably, the frequency of the high-frequency pulse power supply is continuously adjustable, so that the automatic pole inverting function of the first electrode and the second electrode can be realized.
The invention also provides an application of the electric flocculation reactor in treating desulfurization wastewater.
The invention also provides an electro-Fenton-electric flocculation integrated device, which comprises a homogenizing aeration tank, wherein the homogenizing aeration tank is connected with a reaction tank, a neutralization tank and a sedimentation tank in sequence; the upper part of the reaction tank is fixedly provided with the electric flocculation reactor through a bracket, the electric flocculation reactor is connected with the tail end of the homogenizing aeration tank and the upper part of the settling tank through a circulating pump, and the elevation of a water outlet of the electric flocculation reactor is higher than the highest liquid level of the reaction tank; an aeration system is arranged in the homogeneous aeration tank, and is connected with an aeration fan or an ozone generator; the reaction tank and the neutralization tank are internally provided with stirrers; the integrated device also comprises a frequency converter, a control system, an online detection system, an acid dosing system, an alkali dosing system and a hydrogen peroxide dosing system; the frequency converter comprises a frequency converter a, a frequency converter b and a frequency converter c; the online detection system comprises an SS detector, a COD detector, a pH detector and a effluent turbidity meter; the SS detector is arranged at the water inlet, the COD detector is arranged at the water inlet and the water outlet, the pH detector is arranged at the reaction tank and the neutralization tank, and the effluent turbidity meter is arranged at the water outlet; the control system controls the high-frequency pulse power supply to adjust current or voltage according to the SS detector and the COD detector, and controls the cleaning system according to the current or voltage of the high-frequency pulse power supply; the control system controls the frequency converter a to adjust the acid dosing system according to the COD detector and the pH detector of the reaction tank; the control system controls the frequency converter b to adjust the alkali dosing system according to the pH detector of the neutralization pond; the control system controls the frequency converter c to adjust the hydrogen peroxide dosing system according to the COD detector
The water outlet of the electric flocculation reactor is arranged right above the reaction tank, so that the wastewater overflows into the reaction tank through the electric flocculation reactor, the water flow mode can be free-resistance self-flow, and the water flow can take out the flocs generated in the electric flocculation device as much as possible.
Preferably, a baffling section is arranged in front of the neutralization tank, which is favorable for the growth of flocs, and a sludge discharge port is arranged at the lower part of the neutralization tank to prevent the deposition of flocs.
Preferably, a baffling section is arranged in front of the sedimentation tank, which is favorable for the growth of flocs, and a sludge discharge port is arranged at the lower part of the sedimentation tank, so that the flocs are prevented from being deposited.
The invention also provides an application of the integrated device in treating high-COD high-turbidity heavy metal-containing wastewater.
The invention also provides a treatment method applied to the desulfurization wastewater treatment according to the integrated device, which comprises the following steps:
s1, homogenizing and pre-oxidizing desulfurization wastewater in the homogenizing aeration tank through aeration, selectively adding acid according to a COD detector at a water inlet to adjust pH, and automatically adjusting the acid addition amount according to a pH detector of a reaction tank through a frequency converter a to obtain pretreated wastewater; the aeration quantity of the aeration is mainly used for controlling the removal rate of COD in the wastewater, and the effect of controlling the flocculating agent precipitation in the wastewater is used as an auxiliary.
S2, enabling the pretreated wastewater to automatically flow into the reaction tank, stirring and mixing the pretreated wastewater with overflow liquid of the electric flocculation reactor, carrying out flocculation reaction by assisting aeration, selectively adding hydrogen peroxide according to a COD detector at a water inlet and a pH detector of the reaction tank to realize Fenton reaction, controlling the adding amount of the hydrogen peroxide according to the COD detectors at the water inlet and the water outlet, and removing COD in the water by using a frequency converter c to obtain treated wastewater; the aeration quantity of the aeration is mainly used for controlling the flocculating agent precipitation effect in the wastewater, and the produced hydrogen peroxide quantity is used as an auxiliary.
In the step, as the electric flocculation reactor is connected with the tail end of the homogenizing aeration tank and the upper part of the settling tank through the circulating pump, part of the pretreatment wastewater at the tail end of the homogenizing aeration tank or the upper part of the settling tank is pumped into the electric flocculation reactor through the circulating pump, high-activity flocs (namely overflow liquid) and a small amount of hydrogen peroxide generated by the electric flocculation reactor are uniformly mixed with part of the pretreatment wastewater by assistance of aeration, and the mixture flows into the reaction tank together, and according to the water inlet turbidity meter and the COD detector, the current and the voltage of a high-frequency pulse power supply can be automatically regulated through the control system, so that the cation leaching amount of a polar plate is controlled. The wastewater at the tail end of the homogenizing aeration tank or the upper part of the sedimentation tank is selectively pumped into the electric flocculation reactor through the circulating pump, so that on one hand, the conductivity between polar plates can be effectively increased, the energy consumption is reduced, on the other hand, organic matters in the wastewater can be directly oxidized on the polar plates to effectively remove COD, the circulating flow is mainly the COD and the turbidity of the effluent of the control system, and the flow of the circulating pump is regulated through the control system control frequency converter.
S3, enabling the treated wastewater to automatically flow into the neutralization tank for neutralization reaction, selectively adding alkali according to a pH detector of the neutralization tank to adjust pH, and automatically adjusting the alkali addition amount according to the pH detector through a frequency converter b to obtain neutralized wastewater;
s4, enabling the neutralized wastewater to automatically flow into the sedimentation tank for sedimentation to obtain supernatant, judging whether the supernatant meets the standard according to a water outlet turbidity meter and a COD detector at a water inlet, and directly discharging after the standard, or refluxing into the homogenizing aeration tank.
Preferably, in S1, in the homogeneous aeration tank, the aerated gas is at least one of air, oxygen and ozone.
Preferably, in S1, when the COD value of the COD detector at the water inlet is greater than 300ppm, acid is added to adjust pH, and the pH of the wastewater is controlled to 3-5 by adjusting the acid addition amount through the frequency converter a according to the pH detector.
Preferably, in S2, the pH value of the flocculation reaction is controlled to be 4-9 when no acid is added into the electric flocculation reactor.
Preferably, in S2, when the COD value of the COD detector at the water inlet is greater than 300ppm, hydrogen peroxide is added, to implement Fenton reaction, remove COD, and adjust the dosage through the frequency converter c according to the difference between the COD value at the water inlet and the discharge index COD.
Preferably, in S3, when the COD value of the COD detector at the water inlet is greater than 300ppm, alkali is added to adjust pH, and the pH of the wastewater is controlled to be 6-9 by adjusting the alkali addition amount through the frequency converter b according to the pH detector.
Preferably, the cleaning system automatically cleans when the voltage value of the high-frequency pulse power supply is 10-50% higher than the normal voltage.
The control system is not limited, and a PLC control system and a DCS control system are preferable.
Compared with the prior art, the invention has the beneficial effects that:
(1) The electro-Fenton-electro-flocculation integrated device is a combined process of electro-Fenton (automatically selected and started by a program) and electro-flocculation, and is capable of effectively removing pollutants such as COD, heavy metals, SS and the like in water, and has strong impact resistance and stable water quality of effluent; the high-frequency pulse power supply is adopted in the electric flocculation reactor, and aeration is assisted in the electric flocculation reactor, so that low-valence hydroxide can be oxidized into high-valence hydroxide with better performance, the activity of flocs is improved, and a better flocculation effect is obtained; and the first electrode, the second electrode and the induction electrode adopt a bipolar connection mode, so that the distance between the polar plates is effectively reduced, the tank voltage is reduced, the energy-saving effect is achieved, and the processing cost is greatly reduced.
(2) The method and the device can effectively solve the defects of the prior desulfurization wastewater treatment process, including complex process, unstable water quality of treated effluent, high treatment cost, low automation degree and the like; in addition, the method and the device can effectively replace part of traditional dosing agents such as coagulant, coagulant aid, ferrous ions and a small amount of hydrogen peroxide, and avoid secondary pollution.
Drawings
FIG. 1 is a block diagram of an electrocoagulation reactor in an embodiment of the present invention.
FIG. 2 is a block diagram of an electro-Fenton-electro-flocculation integrated apparatus in an embodiment of the invention.
Fig. 3 is a structural diagram of an electrode in an embodiment of the present invention.
Fig. 4 is a logic diagram of a PLC control system according to an embodiment of the present invention.
In the drawing, a 1-insulating shell, a 2-water inlet, a 3-water outlet, a 4-cleaning system, a 5-mud discharge outlet, a 6-electrode tank, a 7-first electrode, a 8-second electrode, a 9-induction electrode, a 10-high-frequency pulse power supply, a 11-mud bucket, a 12-air inlet, a 13-circulating pump, a 14-homogenizing aeration tank, a 15-reaction tank, a 16-neutralizing tank, a 17-sedimentation tank, a 18-aeration system, a 19-stirrer and a 20-aeration fan are arranged.
Detailed Description
The technical scheme of the present invention will be described in detail by means of specific embodiments and drawings, but the scope of the present invention is not limited to the embodiments.
Example 1
An electric flocculation reactor, referring to figures 1-4, comprises an insulating shell 1, a water inlet 2, a water outlet 3, a cleaning system 4 and a mud discharge outlet 5; an electrode groove 6 is arranged in the insulating shell 1, and the electrode groove 6 is used for installing a first electrode 7, a second electrode 8 and an induction electrode 9 and is provided with an electric connection plate to be connected with a high-frequency pulse power supply 10; the bottom of the insulating shell 1 is provided with a mud bucket 11; an air inlet 12 is formed in one side of the insulating shell 1, one end of the air inlet 12 is connected with the electrode groove 6, and the other end of the air inlet 12 is connected with an outlet of the aeration fan 20 for aeration; the water inlet 2 is respectively connected with the electrode groove 6 and the mud bucket 11 through the circulating pump 13, the water outlet 3 is arranged on the opposite side part of the insulating shell 1 and the water inlet 2, the mud discharging and discharging outlet 5 is respectively connected with the insulating shell 1 and the mud bucket 11, and the cleaning system 4 is connected with the electrode groove 6.
Wherein the first electrode 7, the second electrode 8 and the induction electrode 9 adopt 6 loops, 5 induction polar plates are arranged in each loop, the polar plate distance is 2.5mm, and the current density is 1mA/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first electrode 7, the second electrode 8 and the sensing electrode 9 are iron plates.
Wherein the aerated gas is air; the cleaning liquid of the cleaning system 4 is clean water; the parameters of the high frequency pulse power supply 10 are as follows: the output voltage is 0-55V, the current is 0-250A, the frequency range is 500-10000HZ, the output voltage is continuously adjustable, and the duty ratio is 50%.
An electro-Fenton-electric flocculation integrated device comprises a homogenizing aeration tank 14, wherein the homogenizing aeration tank 14 is connected with a sedimentation tank 17 through a reaction tank 15, a neutralization tank 16 and a sedimentation tank in sequence; the electric flocculation reactor is arranged above the reaction tank 15, the electric flocculation reactor is connected with the tail end 14 of the homogenizing aeration tank and the upper part of the sedimentation tank 17 through a circulating pump 13, and the elevation of a water outlet 3 of the electric flocculation reactor is higher than the highest liquid level of the reaction tank 15; an aeration system 18 is arranged in the homogeneous aeration tank 14, and the aeration system 18 is connected with an aeration fan 20; the reaction tank 15 and the neutralization tank 16 are provided with stirrers 19; the integrated device also comprises a frequency converter, a control system, an online detection system, an acid dosing system, an alkali dosing system and a hydrogen peroxide dosing system; the frequency converter comprises a frequency converter a, a frequency converter b, a frequency converter c and a frequency converter d; the online detection system comprises an SS detector, a COD detector, a PH detector and a effluent turbidity meter; the SS detector is arranged at the water inlet 2, the COD detector is arranged at the water inlet 2 and the water outlet 3, the pH detector is arranged at the reaction tank and the neutralization tank, and the effluent turbidity meter is arranged at the water outlet 3; the control system controls the high-frequency pulse power supply 10 to adjust current or voltage according to the SS detector and the COD detector, and controls the cleaning system according to the current or voltage of the high-frequency pulse power supply 10; the control system controls the frequency converter a to adjust the acid dosing system according to the COD detector and the pH detector of the reaction tank; the control system controls the frequency converter b to adjust the alkali dosing system according to the pH detector of the neutralization pond; the control system controls the frequency converter c to adjust the hydrogen peroxide dosing system according to the COD detector.
Wherein, a baffling section is arranged in front of the neutralization tank 16, and a mud discharging port is arranged at the lower part of the neutralization tank 16; a baffling section is arranged in front of the sedimentation tank 17, and a sludge discharge port is arranged at the lower part of the sedimentation tank 17.
A treatment method according to the application of the integrated apparatus to treatment of desulfurization wastewater, the method comprising the steps of:
s1, introducing desulfurization wastewater into a homogenizing aeration tank 14, wherein the source water quality of the desulfurization wastewater is as follows: COD 400mg/L, TDS 37000mg/L, SS 15000mg/L, arsenic 0.014mg/L, cadmium 0.012mg/L, chromium 0.004 mg/L, nickel 0.15ppm, mercury 0.5ug/L. As the online inflow COD meter detects that COD is more than 300mg/L, the pH value is regulated to 3 by adding acid through an acid dosing system, air aeration is adopted for 1h, the COD of the effluent is 250mg/L, and the heavy metal content is basically unchanged, so that pretreated wastewater is obtained;
s2, enabling the pretreated wastewater to automatically flow into a reaction tank 15, stirring and mixing the wastewater with overflow liquid of the electric flocculation reactor, carrying out flocculation reaction by assisting aeration, controlling a frequency converter d to adjust the flow of a circulating pump through a control system, enabling the reflux amount of the electric flocculation reactor to be 40%, adding hydrogen peroxide through a frequency converter c according to a COD detector at a water inlet and a pH detector of the reaction tank, and selecting the adding amount to be 200mg/L according to the COD detectors at the water inlet and a water outlet to obtain flocculated wastewater;
s3, enabling the flocculated wastewater to automatically flow into a neutralization tank 16 for neutralization reaction, and adding alkali to adjust the pH value to 6 through an alkali dosing system to obtain neutralized wastewater;
s4, enabling the neutralized wastewater to automatically flow into a sedimentation tank 17 for sedimentation to obtain supernatant, wherein the supernatant is: COD115mg/L, SS 32mg/L, arsenic 0.006mg/L, cadmium 0.008mg/L, chromium 0.003mg/L, nickel 0.06ppm and mercury 0.2ug/L, and effluent is discharged up to the standard.
In S2, when no acid is added into the electric flocculation reactor, controlling the pH value of the flocculation reaction to be 4.
Wherein, when the voltage value of the high-frequency pulse power supply 10 is 10% higher than the normal voltage, the cleaning system 4 performs automatic cleaning.
Wherein, control system is PLC control system.
The electro-Fenton-electro-flocculation integrated device combines electro-Fenton (automatically selected and started by a program) and electro-flocculation combined technology, so that pollutants such as COD, heavy metals and SS in water are effectively removed, the shock resistance is high, and the quality of effluent is stable; the high-frequency pulse power supply 10 is adopted in the electric flocculation reactor, and aeration is assisted in the electric flocculation reactor, so that low-valence hydroxide can be oxidized into high-valence hydroxide with better performance, the activity of flocs is improved, a better flocculation effect is obtained, meanwhile, the cathode and the anode can be freely switched by the high-frequency pulse power supply 10, and the anode replacement frequency and the polar plate passivation phenomenon of an electric flocculation device in the electrolysis process are reduced; and the first electrode 7, the second electrode 8 and the induction electrode 9 adopt a bipolar connection mode, so that the distance between polar plates is effectively reduced, the tank voltage is reduced, the energy-saving effect is achieved, and the processing cost is greatly reduced.
Example 2
An electric flocculation reactor, referring to figures 1-4, comprises an insulating shell 1, a water inlet 2, a water outlet 3, a cleaning system 4 and a mud discharge outlet 5; an electrode groove 6 is arranged in the insulating shell 1, and the electrode groove 6 is used for installing a first electrode 7, a second electrode 8 and an induction electrode 9 and is provided with an electric connection plate to be connected with a high-frequency pulse power supply 10; the bottom of the insulating shell 1 is provided with a mud bucket 11; an air inlet 12 is formed in one side of the insulating shell 1, one end of the air inlet 12 is connected with the electrode groove 6, and the other end of the air inlet 12 is connected with an outlet of the aeration fan 20 for aeration; the water inlet 2 is respectively connected with the electrode groove 6 and the mud bucket 11 through the circulating pump 13, the water outlet 3 is arranged on the opposite side part of the insulating shell 1 and the water inlet 2, the mud discharging and discharging outlet 5 is respectively connected with the insulating shell 1 and the mud bucket 11, and the cleaning system 4 is connected with the electrode groove 6.
Wherein the first electrode 7, the second electrode 8 and the induction electrode 9 adopt 5 loops, 5 induction plates are arranged in each loop, the spacing between the plates is 30mm, and the current density is 5mA/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first electrode 7, the second electrode 8 and the sensing electrode 9 are iron plates.
Wherein the aerated gas is ozone; the cleaning solution of the cleaning system 4 is weak acid cleaning solution; the parameters of the high frequency pulse power supply 10 are as follows: the output voltage is 0-55V, the current is 0-250A, the frequency range is 500-10000HZ, the output voltage is continuously adjustable, and the duty ratio is 50%.
An electro-Fenton-electric flocculation integrated device comprises a homogenizing aeration tank 14, wherein the homogenizing aeration tank 14 is connected with a sedimentation tank 17 through a reaction tank 15, a neutralization tank 16 and a sedimentation tank in sequence; the electric flocculation reactor is arranged above the reaction tank 15, the electric flocculation reactor is connected with the tail end 14 of the homogenizing aeration tank and the upper part of the sedimentation tank 17 through a circulating pump 13, and the elevation of a water outlet 3 of the electric flocculation reactor is higher than the highest liquid level of the reaction tank 15; an aeration system 18 is arranged in the homogeneous aeration tank 14, and the aeration system 18 is connected with an aeration fan; the reaction tank 15 and the neutralization tank 16 are provided with stirrers 19; the integrated device also comprises a frequency converter, a control system, an online detection system, an acid dosing system, an alkali dosing system and a hydrogen peroxide dosing system; the frequency converter comprises a frequency converter a, a frequency converter b, a frequency converter c and a frequency converter d; the online detection system comprises an SS detector, a COD detector, a pH detector and a effluent turbidity meter; the SS detector is arranged at the water inlet 2, the COD detector is arranged at the water inlet 2 and the water outlet 3, the pH detector is arranged at the reaction tank and the neutralization tank, and the effluent turbidity meter is arranged at the water outlet 3; the control system controls the high-frequency pulse power supply 10 to adjust current or voltage according to the SS detector and the COD detector, and controls the cleaning system according to the current or voltage of the high-frequency pulse power supply 10; the control system controls the frequency converter a to adjust the acid dosing system according to the COD detector and the pH detector of the reaction tank; the control system controls the frequency converter b to adjust the alkali dosing system according to the pH detector of the neutralization pond; the control system controls the frequency converter c to adjust the hydrogen peroxide dosing system according to the COD detector.
Wherein, a baffling section is arranged in front of the neutralization tank 16, and a mud discharging port is arranged at the lower part of the neutralization tank 16; a baffling section is arranged in front of the sedimentation tank 17, and a sludge discharge port is arranged at the lower part of the sedimentation tank 17.
A treatment method according to the application of the integrated apparatus to treatment of desulfurization wastewater, the method comprising the steps of:
s1, introducing desulfurization wastewater into a homogenizing aeration tank 14, wherein the source water quality of the desulfurization wastewater is as follows: COD 260mg/L, TDS 35000mg/L, SS 12000mg/L, arsenic 0.01mg/L, cadmium 0.015mg/L, chromium 0.005mg/L, nickel 0.1ppm, and mercury 0.3ug/L. As the online inflow COD meter detects that COD is less than or equal to 300mg/L, the pH value is not regulated by adding acid, ozone aeration is adopted for 1h, the effluent COD is 150mg/L, and the heavy metal content is basically unchanged, so that the pretreated wastewater is obtained.
S2, enabling the pretreated wastewater to automatically flow into a reaction tank 15, stirring and mixing the wastewater with overflow liquid of the electric flocculation reactor, carrying out flocculation reaction by assisting aeration, controlling a frequency converter d to adjust the flow of a circulating pump through a control system, enabling the reflux amount of the electric flocculation reactor to be 20%, adding hydrogen peroxide through a frequency converter c according to a COD detector at a water inlet and a pH detector of the reaction tank, and selecting the adding amount to be 100mg/L according to the COD detectors at the water inlet and a water outlet to obtain flocculated wastewater;
s3, enabling the flocculated wastewater to automatically flow into a neutralization tank 16 for neutralization reaction, and adding alkali to adjust the pH value to 9 through an alkali dosing system to obtain neutralized wastewater;
s4, enabling the neutralized wastewater to automatically flow into a sedimentation tank 17 for sedimentation to obtain supernatant, wherein the supernatant is: COD115mg/L, SS 32mg/L, arsenic 0.006mg/L, cadmium 0.008mg/L, chromium 0.003mg/L, nickel 0.06ppm and mercury 0.2ug/L, and effluent is discharged up to the standard.
In S1, in the homogenizing aeration tank 14, the aerated gas is ozone; in S1, the specific operation of selectively adding acid to adjust the pH value is as follows: when the COD value of the inflow COD detector is greater than 300ppm, starting to add acid to adjust the pH value, adjusting the acid adding amount through frequency conversion, and controlling the pH value of the wastewater to be 5 through the online pH meter.
In S2, when no acid is added into the electric flocculation reactor, controlling the pH value of the flocculation reaction to be 9;
wherein, when the voltage value of the high-frequency pulse power supply 10 is 50% higher than the normal voltage, the cleaning system 4 performs automatic cleaning.
Wherein, control system is PLC control system.
The electro-Fenton-electro-flocculation integrated device combines electro-Fenton (automatically selected and started by a program) and electro-flocculation combined technology, so that pollutants such as COD, heavy metals and SS in water are effectively removed, the shock resistance is high, and the quality of effluent is stable; the high-frequency pulse power supply 10 is adopted in the electric flocculation reactor, and aeration is assisted in the electric flocculation reactor, so that low-valence hydroxide can be oxidized into high-valence hydroxide with better performance, the activity of flocs is improved, a better flocculation effect is obtained, meanwhile, the cathode and the anode can be freely switched by the high-frequency pulse power supply 10, and the anode replacement frequency and the polar plate passivation phenomenon of an electric flocculation device in the electrolysis process are reduced; and the first electrode 7, the second electrode 8 and the induction electrode 9 adopt a bipolar connection mode, so that the distance between polar plates is effectively reduced, the tank voltage is reduced, the energy-saving effect is achieved, and the processing cost is greatly reduced.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. The electro-Fenton-electro-flocculation integrated device is characterized by comprising a homogenizing aeration tank, wherein the homogenizing aeration tank is connected with a reaction tank, a neutralization tank and a sedimentation tank in sequence; an electric flocculation reactor is arranged above the reaction tank and comprises an insulating shell, a water inlet, a water outlet, a cleaning system and a mud discharge outlet; an electrode groove is formed in the insulating shell, and is used for installing a first electrode, a second electrode and an induction electrode, and is provided with a power connection plate to be connected with a high-frequency pulse power supply; a mud bucket is arranged at the bottom of the insulating shell; an air inlet is formed in one side of the insulating shell, one end of the air inlet is connected with the electrode groove, and the other end of the air inlet is connected with an outlet of the aeration fan and used for aeration; the water inlet is respectively connected with the electrode tank and the mud bucket through the circulating pump, the water outlet is arranged at the side part of the insulating shell opposite to the water inlet, the mud discharging outlet is respectively connected with the insulating shell and the mud bucket through the circulating pump, and the cleaning system is connected with the electrode tank; the first electrode, the second electrode and the induction electrode adopt a multipolar connection mode; the first electrode, the second electrode and the induction electrode are all soluble polar plates, and the soluble polar plates are iron plates; the aeration gas is at least one of air, oxygen and ozone; the cleaning liquid of the cleaning system is at least one of clear water and weak acid cleaning liquid; the frequency of the high-frequency pulse power supply is continuously adjustable;
the electric flocculation reactor is connected with the tail end of the homogenizing aeration tank and the upper part of the sedimentation tank through a circulating pump, and the elevation of the water outlet of the electric flocculation reactor is higher than the highest liquid level of the reaction tank; an aeration system is arranged in the homogeneous aeration tank, and is connected with an aeration fan or an ozone generator; the reaction tank and the neutralization tank are internally provided with stirrers; the integrated device also comprises a frequency converter, a control system, an online detection system, an acid dosing system, an alkali dosing system and a hydrogen peroxide dosing system; the frequency converter comprises a frequency converter a, a frequency converter b and a frequency converter c; the online detection system comprises an SS detector, a COD detector, a pH detector and a effluent turbidity meter; the SS detector is arranged at the water inlet, the COD detector is arranged at the water inlet and the water outlet, the pH detector is arranged at the reaction tank and the neutralization tank, and the effluent turbidity meter is arranged at the water outlet; the control system controls the high-frequency pulse power supply to adjust current or voltage according to the SS detector and the COD detector, and controls the cleaning system according to the current or voltage of the high-frequency pulse power supply; the control system controls the frequency converter a to adjust the acid dosing system according to the water inlet COD detector and the reaction tank pH detector; the control system controls the frequency converter b to adjust the alkali dosing system according to the pH detector of the neutralization pond; and the control system controls the frequency converter c to adjust the hydrogen peroxide dosing system according to the COD detectors at the water inlet and the water outlet.
2. The integrated device according to claim 1, wherein a baffle section is arranged in front of the neutralization tank, and a sludge discharge port is arranged at the lower part of the neutralization tank.
3. The integrated device according to claim 1 or 2, wherein a baffling section is arranged in front of the sedimentation tank, and a sludge discharge port is arranged at the lower part of the sedimentation tank.
4. Use of the integrated device of any one of claims 1-3 for treating high COD high turbidity heavy metal containing wastewater.
5. A treatment method for the treatment of desulfurization wastewater by using the integrated apparatus according to any one of claims 1 to 3, characterized by comprising the steps of:
s1, homogenizing and pre-oxidizing desulfurization wastewater in the homogenizing aeration tank through aeration, selectively adding acid according to a COD detector at a water inlet to adjust pH, and automatically adjusting the acid addition amount according to a pH detector of a reaction tank through a frequency converter a to obtain pretreated wastewater;
s2, enabling the pretreated wastewater to automatically flow into the reaction tank, stirring and mixing the pretreated wastewater with overflow liquid of the electric flocculation reactor, carrying out flocculation reaction by assisting aeration, selectively adding hydrogen peroxide according to a COD detector at a water inlet and a pH detector of the reaction tank to realize Fenton reaction, controlling the adding amount of the hydrogen peroxide according to the COD detectors at the water inlet and the water outlet, and removing COD in the water by using a frequency converter c to obtain treated wastewater;
s3, enabling the treated wastewater to automatically flow into the neutralization tank for neutralization reaction, selectively adding alkali according to a pH detector of the neutralization tank to adjust pH, and automatically adjusting the alkali addition amount according to the pH detector through a frequency converter b to obtain neutralized wastewater;
s4, enabling the neutralized wastewater to automatically flow into the sedimentation tank for sedimentation to obtain supernatant, judging whether the supernatant meets the standard according to a water outlet turbidity meter and a COD detector at a water outlet, and directly discharging after reaching the standard, or refluxing into the homogenizing aeration tank.
6. The method according to claim 5, wherein in S1, the aerated gas in the homogeneous aeration tank is at least one of air, oxygen, and ozone.
7. The treatment method according to claim 5, wherein in S1, when the COD value of the COD detector at the water inlet is greater than 300ppm, the pH value of the wastewater is controlled to be 3-5 by starting to add acid to adjust the pH value and adjusting the acid addition amount through the frequency converter a according to the pH detector.
8. A process according to claim 5, wherein in S2, the pH of the flocculation reaction is controlled to be 4-9 in the absence of the addition of acid to the electrocoagulation reactor.
9. The treatment method according to claim 5, wherein in S2, when the COD value of the COD detector at the water inlet is greater than 300ppm, the addition of hydrogen peroxide is started to implement the Fenton reaction, the COD is removed, and the dosage is adjusted by the frequency converter c according to the difference between the COD value at the water inlet and the discharge index COD.
10. The treatment method according to claim 5, wherein in S3, when the COD value of the COD detector at the water inlet is greater than 300ppm, alkali is added to adjust pH, and the amount of alkali is adjusted by the frequency converter b according to the pH detector, so as to control the pH of the wastewater to 6-9.
11. The method according to claim 5, wherein the cleaning system automatically cleans when the high-frequency pulse power supply voltage is 10-50% higher than the normal voltage.
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