CN207845431U - A kind of high vanadium SCR denitration regenerative wastewater processing unit - Google Patents

Abstract

The utility model discloses a high-vanadium SCR denitrification catalyst regeneration wastewater treatment device, which is provided with a pre-sedimentation tank, followed by a circulation pool, a waste water pool, an iron-carbon micro-electrolysis tank, a triple tank, a sedimentation tank, a hydrolysis Acidification tank, contact oxidation tank, aeration oxidation tank, integrated MBR system, ozone oxidation tower and clean water tank; pre-sedimentation tank, iron-carbon micro-electrolysis tank, triple tank, sedimentation tank and integrated MBR system all pass through switchable pipelines It is connected to the sludge pool, and a sludge dehydrator is installed beside the sludge pool; the flow pool is provided with a NaOH feeding port; the iron-carbon micro-electrolysis box is provided with iron-carbon micro-electrolysis filler; the triple box includes a reaction box, a middle There are three processing boxes, namely, the neutralization box and the flocculation box. The reaction box is equipped with a FeSO4 feeding port, the neutralization box is equipped with a lye feeding port, and the flocculation box is provided with a coagulant aid feeding port. The beneficial effects of the utility model are that the treatment efficiency of the high-vanadium SCR denitrification catalyst regenerated wastewater can be improved, the treatment cost can be reduced, and the volume of solid waste can be reduced.

Description

A high vanadium SCR denitrification catalyst regeneration wastewater treatment device

technical field

The utility model belongs to the field of environmental protection, in particular to a high-vanadium SCR denitrification catalyst regeneration wastewater treatment device.

Background technique

Thermal power plants burn a large amount of coal to produce electricity, and the flue gas after combustion contains a considerable proportion of nitrogen oxides, which need to be treated with SCR denitrification catalysts to reduce the content of nitrogen oxides and meet the emission standards. The SCR denitration catalyst needs to be regenerated after a period of use to restore its catalytic activity. At present, SCR commercial catalysts basically use TiO2 as the base material, V2O5 as the main active component, and WO3 and MoO3 as anti-oxidation and anti-poisoning auxiliary components. Chinese patent document CN104667997A disclosed "a SCR catalyst regeneration method" on June 3, 2015, which is aimed at vanadium-containing SCR denitration catalysts. SCR catalyst water washing regeneration mainly involves four steps, namely pre-cleaning, acid cleaning, chemical cleaning, active component loading, etc. Among them, the active loading does not generate wastewater, and the wastewater generated by the other three processes will be collected and treated in a unified manner. After testing, the main pollutants of wastewater are suspended solids, heavy metals, surfactants, ammonia nitrogen, etc. Therefore, catalyst denitrification wastewater presents the characteristics of high vanadium, high organic matter, heavy metals, etc., poor biodegradability, high pollution, and high difficulty in treatment. SCR out-of-stock catalyst regeneration wastewater must go through a suitable treatment plan to meet the discharge standards for discharge. Due to the increasing environmental protection requirements, the regeneration frequency of SCR catalysts is also increasing, and the amount of sewage to be treated during the regeneration process is also increasing. Most of the existing high-vanadium SCR denitrification catalyst regeneration wastewater treatment uses bentonite adsorption method, which has high efficiency and low cost, and the waste volume is huge, which is not conducive to the final harmless disposal.

Contents of the invention

The technical problem to be solved by the utility model is that the existing high-vanadium SCR denitrification catalyst regeneration wastewater is high in vanadium, high in organic matter, and heavy metals, has poor biodegradability, high pollution, high processing difficulty, and a large volume of waste, thereby providing a high-vanadium The SCR denitrification catalyst regeneration wastewater treatment device can improve treatment efficiency, reduce treatment costs, and reduce the volume of solid waste.

In order to achieve the purpose of the invention, the utility model adopts the following technical scheme: a high-vanadium SCR denitrification catalyst regeneration wastewater treatment device is provided with a pre-sedimentation tank, followed by a circulation pool, a waste water pool, and an iron-carbon micro-electrolyzer , triple box, sedimentation tank, hydrolytic acidification tank, contact oxidation tank, aeration oxidation tank, integrated MBR system, ozone oxidation tower and clear water tank; pre-sedimentation tank, iron-carbon micro electrolysis tank, triple tank, sedimentation tank and integration The MBR system is connected to the sludge pool through switchable pipelines, and a sludge dehydrator is installed beside the sludge pool; the flow pool is equipped with NaOH feeding port; the iron-carbon micro-electrolysis box is equipped with iron-carbon micro-electrolysis filler; triple The box includes three treatment boxes in sequence: reaction box, neutralization box, and flocculation box. The reaction box is equipped with FeSO4 feeding port, the neutralization box is equipped with lye feeding port, and the flocculation box is provided with coagulant feeding port; the contact oxidation tank and The aeration oxidation tank is equipped with aeration equipment.

The regenerated wastewater treatment device designed in this scheme includes a pre-sedimentation tank, a flow tank, a waste water tank, an iron-carbon micro-electrolysis tank, a triple tank, a sedimentation tank, a hydrolytic acidification tank, a contact oxidation tank, and an aeration oxidation tank in sequence along the sewage treatment process. pool, integrated MBR system, ozonation tower and clear water pool. The SCR out-of-stock wastewater first enters the pre-sedimentation tank for sedimentation, and the large-particle solids suspended in the wastewater first settle into the bottom sludge, which flows into the sludge tank through the sludge discharge ditch; the wastewater after pre-settling treatment flows into the flow tank by itself, and the residence time For no less than 5 minutes, add NaOH reagent to the flow pool to adjust the pH to about 3 and then flow to the waste water pool; use the pump to lift the waste water in the waste water pool to the iron-carbon micro-electrolyzer, and the iron-carbon micro-electrolyte box uses the principle of metal corrosion to form the original The battery treats the wastewater to achieve the purpose of degrading organic pollutants; the triple box is the combination of the reaction box, the neutralization box, and the flocculation box. Combined into triple boxes, it can also be set independently according to needs and arranged in sequence; among them, FeSO4 is added to the reaction box to undergo oxidation-reduction reaction with vanadium in wastewater, and alkali is added to the neutralization box to adjust the pH value of wastewater for subsequent coagulation and sedimentation reaction The coagulation aid is added to the flocculation box to carry out the coagulation reaction. Through these three steps, the vanadium and other heavy metals in the wastewater can be flocculated; Precipitation, so as to separate vanadium and other heavy metals in the wastewater from the water body; the function of the hydrolytic acidification tank is to improve the biodegradability of the wastewater; the contact oxidation tank is a biological treatment device based on the biofilm method and active mud , by providing an oxygen source, the organic matter in the sewage is adsorbed and degraded by microorganisms, so that the water quality is purified; the filler is set in the aeration oxidation tank, and it is used as the carrier of the biofilm. The wastewater to be treated flows through the filler at a certain flow rate after being oxygenated, and contacts with the biofilm. The biofilm and the suspended activated sludge work together to purify the wastewater; the integrated MBR system adopts hollow fiber membrane high-efficiency membrane separation technology The method combined with the traditional activated sludge method can efficiently treat various organic wastewater, and has the characteristics of simple treatment process, small footprint, stable treatment water quality, good effluent water quality and simple maintenance and management; the ozone oxidation tower can further remove waste water Refractory organic matter and decolorize the wastewater; after completing the whole process of treatment, the wastewater finally reaches the clean water tank, which can be recycled in industry, and can also be safely imported into the municipal rainwater pipe network for subsequent treatment. During the treatment process, pre-sedimentation tanks, iron-carbon micro-electrolysis tanks, triple tanks, sedimentation tanks and integrated MBR systems may all generate sludge, so these treatment equipment are designed with sludge discharge channels leading to the sludge tank. After the sludge is sent to the sludge tank, it is dehydrated and reduced by the sludge dehydrator installed next to the sludge tank, and is regularly transported out for harmless treatment. After the treatment of this device, the wastewater containing heavy metals such as nitrogen oxides and vanadium is sufficient to meet the first category of pollutants "Vadium Industry Discharge Standard" (GB26452-2011), and the remaining indicators and "Sewage Comprehensive Discharge Standard" (GB 8978-1996) Secondary standard.

As a preference, the surface load of the pre-sedimentation tank and the sedimentation tank is between 1~1.5 m3/m2h. This can make the wastewater settle more fully. In order to make full use of the potential energy of the water and reduce secondary lifting, the height of the pre-sedimentation tank is higher than that of the sedimentation tank.

As a preference, the hydraulic retention time of the iron-carbon micro-electrolytic box is not less than 2h, the air-water ratio is 5:1, the specific gravity of the filler is 1.1 tons/m3, the specific surface area is 1.2 m2/g, the porosity is 65%, and the physical strength is 800 kg/ cm2, using perforated tube aeration.

Preferably, a stirrer is provided in the reaction box, the neutralization box, and the flocculation box respectively. Setting up the mixer can enhance the disturbance of the water body, so that the added chemicals can be fully mixed in the water body, and help the flocculation of heavy metals and other pollutants.

Preferably, the void ratio of the filler in the hydrolytic acidification tank is 99%, the specific surface area is 1246 m2/m3, the unit weight is 4.6 kg/m3, and the film-forming weight is 60-70 kg/m3.

Preferably, the porosity of the filler in the contact oxidation tank is 99%, the specific surface area is 1246 m2/m3, the unit weight is 4.6 kg/m3, and the film-forming weight is 60-70 kg/m3.

As a preference, the contact oxidation tank is equipped with aeration equipment, the pore density is not less than 2200 per unit, the ventilation volume is 1-3m3/per unith, and the service area should meet 0.3-0.6 m3 per unit.

As a preference, the aeration equipment of the aeration oxidation tank is connected to the same fan as the iron-carbon micro-electrolysis tank and the aeration equipment of the contact oxidation tank; the density of pores is not less than 2200/piece, and the ventilation volume is 1-3 m3/pieceh , the service area should be 0.3-0.6 m3/piece. Fan sharing is designed, which can save energy and equipment installation space, save investment, and maximize the use of idle resources of equipment.

As a preference, in the integrated MBR system, the membrane flux is not more than 15 L/m2h, the membrane system return flow is not less than 2Q, and the normal filtration cycle of the MBR system is to run for 8 minutes and then stop for 2 minutes. Here, in order to improve the continuous treatment effect, the chemical cleaning of the MBR membrane is about once a month, and the off-line chemical cleaning is about half a year. The cleaning period is 7 to 10 days, and the concentration is 0.3% citric acid for cleaning.

Preferably, the integrated MBR system is also equipped with a sludge return pump for returning the sludge to the hydrolysis acidification tank, the contact oxidation tank, and the aeration oxidation tank. This design can ensure the balance of sludge concentration in the integrated MBR system, which is conducive to long-term and efficient treatment of wastewater.

As preferably, the height of the drain of the pre-sedimentation tank is higher than the liquid level of the flow cell; the height of the drain of the flow cell is higher than the liquid level of the waste water pool; the height of the drain of the iron-carbon micro-electrolyzer is higher than the liquid level of the triple box; The height of the drain outlet of the sedimentation tank is higher than the liquid level of the sedimentation tank; the height of the drain outlet of the sedimentation tank is higher than the liquid level of the hydrolytic acidification tank; the height of the drain outlet of the hydrolytic acidification tank is higher than the liquid level of the contact oxidation tank; the height of the drain outlet of the contact oxidation tank The height is higher than the liquid level of the aeration oxidation tank; the height of the drain of the aeration oxidation tank is higher than the liquid level of the integrated MBR system; the height of the drain of the ozone oxidation tower is higher than the liquid level of the clear water tank. In this design, pumps are only required to introduce wastewater from the wastewater pool to the iron-carbon micro-electrolyzer at a high place, and pumps are required to introduce wastewater from the integrated MBR system to the ozonation tower at a high place. Between other treatment equipment The height of the liquid level is lowered in sequence according to the flow direction, so that the waste water can flow directly from the previous equipment to the next equipment by gravity, which reduces the configuration of power equipment and saves energy consumption for treatment.

In summary, the beneficial effects of the utility model are: it can improve the treatment efficiency of high-vanadium SCR denitrification catalyst regeneration wastewater, reduce the treatment cost, and reduce the volume of solid waste.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them: 1 pre-sedimentation tank, 2 flow tank, 3 waste water tank, 4 iron-carbon micro electrolysis tank, 5 triple tank, 6 sedimentation tank, 7 hydrolytic acidification tank, 8 contact oxidation tank, 9 aeration oxidation tank, 10 integrated MBR System, 11 ozone oxidation tower, 12 clear water tank, 13 sludge tank, 14 sludge dehydrator.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

The embodiment shown in Fig. 1 is a high-vanadium SCR denitrification catalyst regenerated wastewater treatment device, which is applied to the treatment of regenerated wastewater of high-vanadium SCR denitrification catalysts used in thermal power plants.

The equipment in this example includes pre-sedimentation tank 1, circulation tank 2, wastewater tank 3, iron-carbon micro-electrolysis tank 4, triple tank 5, sedimentation tank 6, hydrolytic acidification tank 7, contact oxidation tank 8, aeration according to the wastewater treatment process. Oxidation pond 9, integrated MBR system 10, ozone oxidation tower 11, clear water pond 12. Among them, the pre-sedimentation tank, iron-carbon micro-electrolysis tank, triple tank, sedimentation tank and integrated MBR system will all generate sludge during the treatment process, so they are all connected to the sludge tank 13 through the sludge discharge ditch, and installed next to the sludge tank There is a sludge dewatering machine 14, which can dehydrate and reduce the collected sludge for regular removal.

The following is an introduction to the device itself and the treatment process based on the wastewater treatment process in this device.

a: High-vanadium SCR denitrification catalyst regeneration wastewater first enters the pre-sedimentation tank for precipitation. The surface load of the pre-sedimentation tank is between 1 and 1.5 m3/m2h, and large particles of solid matter settle to the bottom;

b: The wastewater after pre-sedimentation treatment in step a flows into the flow pool by itself. The flow pool should ensure that the residence time is not less than 5 minutes. Add NaOH to the flow pool to adjust the pH to about 3, and then flow into the waste water pool;

c: Pump the wastewater in the wastewater pool in step b to the iron-carbon micro-electrolyzer, the residence time of the iron-carbon micro-electrolyzer is not less than 2 h, the gas-water ratio is 5:1, and the iron-carbon filler: specific gravity 1.1 tons/m3, specific gravity The surface area is 1.2 m2/g, the porosity is 65%, the physical strength is 800 kg/cm2, and the perforated tube aeration method is adopted;

d: The waste water treated in step c flows into the triple box by itself, and the triple box includes a reaction box, a neutralization box, and a flocculation box arranged in sequence. FeSO4 is added to the reaction box to react with the vanadium in the waste water for oxidation-reduction reaction, alkali is added to the neutralization box to adjust the pH value of the waste water for subsequent coagulation and sedimentation reaction, and coagulation aids such as PAM are added to the flocculation box for coagulation reaction ;Each independent box is equipped with a mixer;

e: After the treatment in step d, the waste water flows into the settling tank by itself, and its function is to generate flocs through the first-stage coagulation reaction, and to carry out precipitation to remove vanadium and other heavy metals in the water. The surface load of the sedimentation tank is between 1~1.5 m3/m2h;

f: The waste water treated in step e flows into the hydrolytic acidification tank, contact oxidation tank and aeration oxidation tank sequentially; among them, the filling of the hydrolytic acidification tank and contact oxidation tank requires a porosity of 99%, a specific surface area of 1246 m2/m3, and a unit weight of 4.6 kg /m3, film weight 60-70 kg/m3. The contact oxidation tank and the aeration oxidation tank need to be equipped with an aeration system, the stomatal density is not less than 2200 per tank, the ventilation volume is 1-3 m3 per tank h, and the service area should meet 0.3-0.6 m3 per tank;

g: The wastewater treated in step f flows into the integrated MBR system by itself, the membrane flux is not large at 15 L/m2h, the return flow of the membrane system is not less than 2Q, the normal filtration cycle of the MBR system is to run for 8 minutes, stop for 2 minutes, chemical Cleaning is about once a month, off-line chemical cleaning is about half a year, and the alkali maintenance cleaning cycle is 1 to 3 days, using NaClO with a concentration of 500 ppm for cleaning, and the acid maintenance cleaning cycle is 7 to 10 days, using a concentration of 0.3 % The integrated MBR system is also equipped with a sludge return pump to return the sludge to the hydrolytic acidification tank, contact oxidation tank, and aerated oxidation tank. In order to ensure the balance of sludge concentration in the integrated MBR system, some membranes The pool sludge is lifted to the hydrolysis acidification tank, contact oxidation tank and aeration oxidation tank through the sludge return pump;

h: The waste water treated in step g is sucked and pumped by the MBR system to the ozonation tower for further removal of refractory organic matter and decolorization. The residence time of the ozone oxidation tower is not less than 2 hours, and the ozone concentration is not less than 20-30 mg/L;

i: After the treatment in step h, the waste water flows into the clear water tank by itself; the clear water in the clear water tank can be recycled in industry, and can also be safely imported into the municipal rainwater pipe network and be normally recycled and processed by the recycling sewage treatment plant;

j: The sludge generated in steps a, c, d, e, and g enters the sludge tank by self-flow through the sludge discharge ditch, and the sludge tank is transported to the sludge dehydrator by the sludge pump for dehydration, and the sludge after dehydration and reduction is regularly Clearance.

In this device, the aeration equipment of the aeration oxidation tank is connected to the same fan as the iron-carbon micro-electrolysis tank and the aeration equipment of the contact oxidation tank, which can save energy and equipment installation space, save investment, and maximize the use of idle resources of equipment .

The height of the drain outlet of the pre-sedimentation tank is higher than the liquid level of the flow pool; the height of the drain outlet of the flow pool is higher than the liquid level of the waste water pool; The height of the outlet of the sedimentation tank is higher than the liquid level of the hydrolysis and acidification tank; the height of the outlet of the hydrolysis acidification tank is higher than the liquid level of the contact oxidation tank; the height of the outlet of the contact oxidation tank is higher than The liquid level of the aeration oxidation tank; the height of the outlet of the aeration oxidation tank is higher than the liquid level of the integrated MBR system; the height of the outlet of the ozone oxidation tower is higher than the liquid level of the clear water tank. The iron-carbon micro-electrolyzer that only introduces wastewater from the waste water pool to the high place needs to use a pump, and the ozone oxidation tower that introduces wastewater from the integrated MBR system to a high place needs to use a pump, and all other treatment equipment are lowered in sequence according to the flow direction The height of the liquid level enables the waste water to flow directly from the previous equipment to the next equipment relying on gravity, which reduces the configuration of power equipment and saves energy consumption for treatment.

Claims (10)

1. a kind of high vanadium SCR denitration regenerative wastewater processing unit is equipped with preformed precipitate case（1）, characterized in that preformed precipitate case Also it is equipped with flow cell successively afterwards（2）, wastewater disposal basin（3）, iron-carbon micro-electrolysis case（4）, three headers（5）, settling tank（6）, hydrolysis acidification Pond（7）, contact-oxidation pool（8）, aeration oxidation pool（9）, integrated MBR system（10）, ozone oxidation tower（11）And clear water reserviors （12）；Preformed precipitate case, iron-carbon micro-electrolysis case, three headers, settling tank and integrated MBR system are connected to by switchable pipeline To sludge-tank（13）, sludge dewatering equipment is installed by sludge-tank（14）；The flow cell is equipped with NaOH feeding ports；Iron-carbon micro-electrolysis Iron-carbon micro-electrolysis filler is equipped in case；Include reaction chamber successively in three headers, neutralize three case, flocculation tanks treatment boxes, reaction chamber Equipped with FeSO4 feeding ports, neutralizes case and be equipped with lye feeding port, flocculation tanks are equipped with flocculation aid feeding port；Contact-oxidation pool and aeration Oxidation pond is equipped with aerator.

2. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1, characterized in that preliminary sedimentation The surface loading of shallow lake case and settling tank is between 1 ~ 1.5 m3/m2 h.

3. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that iron Carbon micro-electrolysis case hydraulic detention time is not less than 2 h, gas-water ratio 5：1, filler proportion is 1.1 tons/m3, specific surface area 1.2 M2/g, voidage are 65 %, and physical strength is 800 kg/cm2, using perforated pipe aerating regulation mode.

4. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that anti- Case is answered, case is neutralized, is respectively equipped with blender in flocculation tanks.

5. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that water The filler voidage 99% of acidification pool is solved, specific surface area is 1246 m2/m3, and Unit Weight is 4.6 kg/m3, and film forming weight is 60-70 kg/m3。

6. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that connect The filler voidage 99% of oxidation pond is touched, specific surface area is 1246 m2/m3, and Unit Weight is 4.6 kg/m3, and film forming weight is 60-70 kg/m3。

7. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 3, characterized in that contact Oxidation pond is equipped with aerator, and not less than 2200/, the m3/ h of ventilatory capacity 1~3, service area should meet stomatal frequency 0.3~0.6 m3/.

8. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 7, characterized in that aeration The aerator of oxidation pond and the aerator of iron-carbon micro-electrolysis case, contact-oxidation pool are connected to same wind turbine；Stomatal frequency Not less than 2200/, the m3/ h of ventilatory capacity 1~3, service area should meet 0.3~0.6 m3/.

9. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that one In body MBR system, the little 15 L/m2 h of membrane flux, membranous system regurgitant volume is not less than 2Q, and the MBR system normal filtration period is Stop 2 min after running 8 min.

10. a kind of high vanadium SCR denitration regenerative wastewater processing unit according to claim 1 or 2, characterized in that The height of the discharge outlet of preformed precipitate case is higher than flow cell liquid level；The height of flow cell discharge outlet is higher than wastewater disposal basin liquid level；Iron carbon is micro- The height of the discharge outlet of electrolyte tank is higher than three header liquid levels；The height of the discharge outlet of three headers is higher than settling tank liquid level；Settling tank Discharge outlet height be higher than hydrolysis acidification pool liquid level；The height of the discharge outlet of hydrolysis acidification pool is higher than contact-oxidation pool liquid level； The height of the discharge outlet of contact-oxidation pool is higher than aeration oxidation pool liquid level；The height of the discharge outlet of aeration oxidation pool is higher than integration The liquid level of MBR system；The height of the discharge outlet of ozone oxidation tower is higher than the liquid level of clear water reserviors.