CN106517619A - Device and method for treating organic wastewater by sound, light and ozone coupling - Google Patents

Abstract

The invention relates to a device for coupling sound, light and ozone to treat organic waste water. The device comprises: a waste water regulating tank for adjusting the pH value of waste water; The ozone pre-oxidation reaction system in which the ozone reaches the saturation concentration; the coupling oxidation reaction system used for ultrasonic, ozone, and ultraviolet light coupling oxidation of wastewater, greatly reducing the concentration of organic matter in wastewater, and achieving the goal of deep oxidation treatment of wastewater; clear water pool; the wastewater The regulating tank, the ozone pre-oxidation reaction system, the ultrasonic-ultraviolet-ozone coupling oxidation reaction system and the clean water tank are connected in sequence from left to right. The device adopts the coupling mechanism of ultrasonic oxidation, ozone oxidation, and ultraviolet light oxidation, and has a built-in ultrasonic vibration plate. The three advanced oxidation technologies are used in conjunction with the treatment of high-concentration and refractory industrial organic wastewater to improve the treatment effect and ensure that the wastewater treatment of enterprises reaches New emission standard requirements.

Description

A device and method for coupling sound, light and ozone to treat organic wastewater

technical field

The invention belongs to the technical field of wastewater treatment, and in particular relates to a device and method for coupling sound, light and ozone to treat organic wastewater. The invention is particularly suitable for treating organic wastewater with refractory biodegradability and high concentration.

Background technique

The treatment of organic wastewater discharged in industrial production has always been an environmental protection problem that plagues enterprises, and it is also a technical problem in water pollution control. The existing industrialization technologies mainly include Fenton reagent oxidation, ozone oxidation, electrochemical oxidation, etc. Among them, the oxidation of Fenton reagents is the most widely used technology, mainly because the initial investment cost of this technology is low, but a large amount of chemicals need to be added during the operation period, the operation cost is high, and a large amount of sludge will be generated , this kind of sludge contains harmful substances and needs to be managed and disposed of in accordance with hazardous waste, which further increases the operating cost of the enterprise. In addition, as the whole society pays more and more attention to environmental protection, it is imperative to upgrade the sewage treatment standard of enterprises. Many places The government has required enterprises to improve the discharge standards of sewage treatment. Only using Fenton reagent oxidation technology to treat wastewater cannot meet the requirements of the new discharge standards. Therefore, it is urgent to develop new technologies to solve this problem.

As an advanced oxidation technology, ozone oxidation is widely used in water treatment. In recent years, it has been gradually applied in the field of wastewater treatment and achieved good results. However, this technology is easily affected by various objective conditions, resulting in the utilization rate of ozone. Low, the dosage is far greater than the theoretical requirement, resulting in higher operating costs and a large amount of residual ozone discharged into the atmosphere to pollute the ambient air. The popularization and application of this technology is limited.

Ultrasonic oxidation technology integrates advanced oxidation, incineration, and supercritical oxidation. It has the advantages of simple and convenient operation and no secondary pollution, but the oxidation efficiency is low. Therefore, this technology is usually coupled with other advanced oxidation technologies to treat a variety of industrial organic wastewater.

The composition of industrial wastewater is complex and there are many types of pollutants. It is difficult to achieve the ideal treatment effect by using a certain technology alone, and it cannot meet the increasingly high environmental protection discharge standards. Therefore, joint research on multiple technologies has attracted attention. It is reported that the process and device for co-treating organic wastewater with ultrasonic wave, ozone and ultraviolet light can improve the treatment effect compared with a single technology, but not significantly; in addition, the utilization rate of ozone is low, and the emptying of residual ozone will also bring air pollution Problem; third, the external ultrasonic vibrator on the thicker reactor wall also reduces the cavitation and other effects of ultrasonic waves, and loses a lot of acoustic energy. Due to the above problems, the cooperative processing efficiency of the joint processing method is greatly reduced, and the coupling effect of the three technologies cannot be truly played.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art, and propose a device and method for coupling treatment of organic wastewater with sound, light, and ozone. Vibration plate uses three advanced oxidation technologies to treat high-concentration, refractory industrial organic wastewater, and uses ozone cycle oxidation technology to improve ozone utilization, reduce ozone emissions, reduce industrial organic wastewater treatment costs, and improve treatment effects. Ensure that the wastewater treatment of enterprises meets the requirements of the new discharge standards, reduce the pressure on environmental protection of enterprises, and protect the ecological environment.

The present invention is achieved through the following technical solutions: a device for coupling treatment of organic wastewater with sound, light and ozone, the device includes:

Wastewater adjustment tanks for adjusting the pH value of wastewater;

Ozone pre-oxidation reaction system used to pre-oxidize small molecular organic matter and destroy macromolecular organic matter in wastewater, and make ozone in wastewater reach saturation concentration;

A coupled oxidation reaction system for ultrasonic, ozone, and ultraviolet light coupling oxidation of wastewater, greatly reducing the concentration of organic matter in wastewater, and achieving the goal of deep oxidation treatment of wastewater;

Clean water tank;

The wastewater regulating pool, the ozone pre-oxidation reaction system, the ultrasonic-ultraviolet light-ozone coupled oxidation reaction system and the clear water pool are arranged sequentially from left to right.

A method for coupling sound, light and ozone to treat organic wastewater, the method comprising the following steps:

①. After the wastewater is discharged into the wastewater adjustment tank, the pH is adjusted between 4-6 with lye or acid solution, and the pH-adjusted wastewater in the wastewater tank is pumped into the ozone pre-oxidation reaction system;

② Turn on the ozone generator, adjust the amount of ozone generated to 5g/h-15g/h, the wastewater in the ozone pre-oxidation reaction system will reach the saturation concentration after ozone pre-oxidation, and then pump it into the coupled oxidation reaction system;

③. The remaining ozone in the ozone pre-oxidation reaction system is discharged from the top evacuation pipeline into the coupling oxidation reaction system, and the ultrasonic generator power supply and the ultraviolet lamp power supply are turned on, so that the ozone oxidation, ultrasonic oxidation and ultraviolet light oxidation are coupled to oxidize the wastewater, and the residence time Determined according to the wastewater treatment effect, the wastewater is discharged to the clean water pool through the valve after reaching the treatment effect.

The acid solution used in step ① is nitric acid of 5-20% concentration or sulfuric acid of 5-20% concentration, and the lye used is sodium hydroxide of 10-20% concentration or sodium carbonate of 5-20% concentration.

The technical solution provided by the invention has the following advantages:

(1) The present invention uses ozone, ultraviolet light, and ultrasonic coupling oxidation to treat organic wastewater, which can completely mineralize organic matter, especially toxic and harmful organic matter that is biodegradable, and significantly enhances the efficiency of the combined treatment of organic wastewater by the three oxidation technologies.

(2) The present invention sets a wastewater regulating tank and an ozone pre-oxidation process at the front end of the process, which can ensure the treatment effect of the subsequent coupling oxidation process and further improve the treatment efficiency.

(3) The wastewater regulating tank has the functions of a buffer pool and a water storage tank, which can not only adjust the pH value, but also adjust the wastewater flow rate, so that the subsequent process influent water volume and water quality are stable.

(4) The ozone pre-oxidation process can decompose and destroy some organic matter, so that the concentration of ozone in the wastewater is saturated, and the remaining ozone circulates into the coupling reaction pool, which is beneficial to the coupling oxidation reaction, can improve the utilization rate of ozone and reduce the pollution of ozone emission to the atmosphere.

(5) The coupled oxidation reaction pool is set in a hexagonal prism structure, and ultrasonic vibrating plates are installed on the six sides, which can speed up the mass transfer rate of the ozone liquid phase, improve the energy and material exchange at the gas-liquid interface, reduce the loss of acoustic energy, and improve Ultrasonic cavitation and other effects, supplemented by ultraviolet light irradiation, thereby generating more holes or hydroxyl radicals to participate in oxidation reactions, improving the mineralization capacity and efficiency of organic matter.

(6) The process of the present invention is simple, does not produce secondary pollution, and occupies a small space. It can be installed in the production workshop to directly treat process wastewater, and can also be installed in a sewage treatment station for comprehensive wastewater treatment.

(7) The process and device of the present invention adopt the coupling mechanism of ultrasonic oxidation, photocatalytic oxidation, and ozone oxidation to increase the yield of strong oxidizing hydroxyl radicals, and simultaneously utilize ozone pre-oxidation and cyclic oxidation to increase the utilization rate of ozone.

Description of drawings

Fig. 1 is a process flow chart of the present invention for coupling treatment of organic wastewater with sound, light and ozone.

Fig. 2 is a schematic diagram of a device for coupling treatment of organic wastewater with sound, light and ozone according to the present invention.

Fig. 3 is a trend diagram of the chemical oxygen demand of the wastewater with different residence times when the process of the present invention is used to treat the chemical wastewater discharged by a dye intermediate production enterprise.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1: a device for coupling treatment of organic wastewater with sound, light and ozone, the device includes:

A wastewater regulating tank a for adjusting the pH value of wastewater;

Ozone pre-oxidation reaction system b used to pre-oxidize small molecular organic matter and destroy macromolecular organic matter in wastewater, and make ozone in wastewater reach a saturated concentration;

A coupled oxidation reaction system c used for coupling oxidation of wastewater with ultrasonic waves, ozone, and ultraviolet light, greatly reducing the concentration of organic matter in wastewater, and achieving the goal of deep oxidation treatment of wastewater;

clean water pool d;

The wastewater regulating pool a, the ozone pre-oxidation reaction system b, the ultrasonic-ultraviolet light-ozone coupled oxidation reaction system c, and the clean water pool d are arranged sequentially from left to right.

A method for coupling sound, light and ozone to treat organic wastewater, the method comprising the following steps:

1. After the waste water is discharged into the waste water adjustment tank a, the pH is adjusted between 4-6 with lye or acid solution, and the pH-adjusted waste water in the waste water tank a is sent into the ozone pre-oxidation reaction system b through a water pump;

2. Turn on the ozone generator, adjust the amount of ozone generated to 5g/h-15g/h, the wastewater in the ozone pre-oxidation reaction system b will reach the saturation concentration after ozone pre-oxidation, and then pump it into the coupled oxidation reaction system c;

3. The remaining ozone in the ozone pre-oxidation reaction system b is discharged from the top evacuation pipeline into the coupling oxidation reaction system c, and the ultrasonic generator power supply and the ultraviolet lamp power supply are turned on, so that the ozone oxidation, ultrasonic oxidation and ultraviolet light oxidation are coupled to oxidize the wastewater, The residence time is determined according to the wastewater treatment effect. After the wastewater reaches the treatment effect, it is discharged to the clear water pool through the valve d.

As shown in Figure 2: the waste water regulating tank a is mainly used to adjust the pH value of waste water, acid solution or lye is added from the top of the waste water regulating tank a, and the acid solution used is nitric acid of 5-20% concentration or 5-20% % concentration of sulfuric acid, the lye used is 10-20% sodium hydroxide or 5-20% concentration of sodium carbonate. A first water inlet a1 is set on the upper end of the left side of the waste water regulating tank a, and a first water outlet a2 is set on the lower end of the right side. The first water outlet a2 is connected to the first valve a3 and the first booster pump a4 in sequence. The water outlet of the pressure pump a4 is sequentially connected with the first flow meter a5 and the second water inlet b1 of the ozone pre-oxidation reaction system b through pipelines.

The ozone pre-oxidation reaction system b is mainly used for pre-oxidizing small molecular organic matter and destroying macromolecular organic matter in waste water, and making the ozone in the waste water reach a saturated concentration; including ozone generator b2 and ozone pre-oxidation reaction tank b3, ozone generator b2 It is any commercially available ozone generator that can produce 15g/h of ozone. The ozone pre-oxidation reaction tank b3 is a sealed reactor, and the bottom of the ozone pre-oxidation reaction tank b3 is equipped with a first disc aeration The pipe b4 and the ozone generator b2 are sequentially connected to the first check valve b5 and the first disc aeration pipe b4 through the pipeline; the top of the ozone pre-oxidation reaction tank b3 has an emptying port b6, and the emptying port b6 is connected in sequence through the pipeline The second valve b7, the gas booster pump b8, the second check valve b9, the coupling oxidation reaction tank c1; the upper left end of the ozone pre-oxidation reaction tank b3 is provided with a second water inlet b1, and the second water inlet b1 passes through the pipeline in sequence It is connected with the first flow meter a5 and the first booster pump a4. A second water outlet b10 is provided at the middle and lower part of the right side of the ozone pre-oxidation reaction tank b3, and the second water outlet b10 is connected to the third valve b11, the second booster pump b12, and the third check valve b13 in sequence through pipelines.

The coupling oxidation reaction system c is mainly used for ultrasonic wave, ozone, ultraviolet light coupling oxidation wastewater, greatly reducing the concentration of organic matter in wastewater, and realizing the goal of deep oxidation treatment of wastewater; including coupling oxidation reaction pool c1, ultrasonic generator c2, ultrasonic vibration Plate c3, ultraviolet lamp c4, ultraviolet lamp power supply c5 and quartz tube c6; the pool body c7 of the coupling oxidation reaction pool c1 is a hexagonal prism, the pool body c7 has six sides, and the ultrasonic vibrating plate c3 is installed on the pool body c7 The inner surface of the ultrasonic vibrating plate c3 cannot be less than 1/5 of the area of the inner surface, and the six sides are all provided with an ultrasonic vibrating plate c3, and the ultrasonic vibrating plate c3 is connected to the ultrasonic generator c2 through the first wire c12; The generator c2 selects any commercially available ultrasonic generator whose frequency is above 40KHz and whose power matches the power of the ultrasonic vibrating plate; a quartz tube c6 is arranged in the center of the coupling oxidation reaction pool c1, and the quartz tube c6 is a center with an opening at one end. Empty tube, the quartz tube c6 is fixed by the fixed bracket c8 on the top of the pool body, the open end of the quartz tube c6 faces upwards, the ultraviolet lamp c4 is inserted into the cavity of the quartz tube c6 and connected to the ultraviolet lamp power supply c5 through the second wire c9; the coupling A second disc aeration pipe c12 is installed at the bottom of the oxidation reaction tank c1; one side of the body c7 of the coupled oxidation reaction tank c1 is provided with a third water outlet c10, and the clean water tank d is connected to the third water outlet c10 through a pipeline , A fourth valve c11 is set between the third water outlet c10 and the clean water pool d, the fourth valve c11 is opened, and the treated waste water is discharged into the clean water pool d through the third water outlet c10.

Taking the treatment of chemical wastewater discharged by a dye intermediate production enterprise as an example, the wastewater treatment process of the present invention is specifically introduced. The chemical wastewater discharged by a dye intermediate production enterprise is discharged into the wastewater regulating pool a, and the pH of the wastewater is adjusted to 4.62 with acid and lye, and then the first valve a3 and the first booster pump a4 are opened, and the first flowmeter is used to The regulating valve that comes with a5 adjusts the waste water flow rate at 1.0L/min-20.0L/min, and the pH-adjusted waste water in the waste water regulating tank a is sent to the ozone pre-oxidation reaction system b through the first booster pump a4 Tank b1, turn on the power button b14 of the ozone generator b2, adjust the ozone output to 5g/h-15g/h through the flow regulating valve b15 of the ozone generator b2, and the output ozone gas passes through the bottom of the ozone pre-oxidation reaction tank b1 The first disc aeration pipe b4 enters the ozone pre-oxidation reaction tank b1, and the ozone and wastewater undergo an oxidation reaction in the ozone pre-oxidation reaction tank b1 to make the ozone reach a saturated concentration. The residence time of the wastewater in the ozone pre-oxidation reaction tank b1 is controlled at 2 Hours to 4 hours later, open the third valve b11, the third check valve b13 and the second booster pump b12, the ozone-saturated wastewater is pumped into the coupled oxidation reaction tank c1, and then open the third valve b11 and open the second valve at the same time b7, the second check valve b9 and the gas booster pump b8, the remaining ozone in the ozone pre-oxidation reaction tank b1 is discharged into the coupling oxidation reaction tank c1 from the top exhaust port b6, and the ultrasonic generator c2 power supply and the ultraviolet lamp power supply c5 are turned on , in the coupled oxidation reaction pool c1, ozone oxidation, ultrasonic oxidation, and ultraviolet light oxidation are used to couple and oxidize the wastewater, and samples are taken at different residence times to detect the chemical oxygen demand of the wastewater. The results are shown in Figure 3. 62% of oxygen removal, 81.5% of chemical oxygen demand in waste water for 2 hours, 95.2% of chemical oxygen demand in waste water for 3 hours, 99.6% of chemical oxygen demand in waste water for 4 hours, chemical oxygen demand in waste water The amount is reduced from 9100mg/L to 36.4mg/L, reaching the first-class A discharge standard of sewage treatment. After the wastewater reaches the treatment effect, it is discharged to the clear water pool d through the fourth valve c11.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. a kind of sound, light and ozone coupling process the device of organic wastewater, it is characterised in that the device includes：

For adjusting the wastewater equalization pond of pH value of waste water（a）；

It is dense for pre-oxidizing waste water small molecular Organic substance with destruction larger molecular organicses and making the ozone in waste water reach saturation The ozone pre-oxidation response system of degree（b）；

For ultrasound wave, ozone, ultraviolet optical coupling oxidized waste water, organic concentration in waste water is greatly lowered, depth oxygen is realized Change the coupling oxidation system for processing waste water target（c）；

Clear water reserviors（d）；

The wastewater equalization pond（a）, ozone pre-oxidation response system（b）, ultrasound wave-ultraviolet light-ozone coupling oxidation reaction system System（c）And clear water reserviors（d）Setting is sequentially connected from left to right.

2. a kind of sound according to claim 1, light and ozone coupling process the device of organic wastewater, it is characterised in that：Institute State wastewater equalization pond（a）Left surface upper end arrange first water inlet（a1）, right flank lower end arranges the first outlet （a2）, the first outlet（a2）It is sequentially connected the first valve（a3）, the first booster pump（a4）, the first booster pump（a4）Outlet By pipeline successively with first flowmeter（a5）, ozone pre-oxidation response system（b）The second water inlet（b1）Connection.

3. a kind of sound according to claim 1, light and ozone coupling process the device of organic wastewater, it is characterised in that：Institute State ozone pre-oxidation response system（b）Including ozonator（b2）With ozone pre-oxidation retort（b3）, the pre- oxygen of the ozone Change retort（b3）Be one sealing reactor, ozone pre-oxidation retort（b3）Bottom be equipped with a first disc type aeration Pipe（b4）, ozonator（b2）First non-return valve is sequentially connected by pipeline（b5）, the first disc type aeration tube（b4）；Ozone is pre- Oxidation reaction tank（b3）Top leave evacuation port（b6）, evacuation port（b6）Second valve is sequentially connected by pipeline（b7）, gas Body booster pump（b8）, the second non-return valve（b9）, coupling oxidation reaction pond（c1）；The ozone pre-oxidation retort（b3）Left side Upper end is provided with the second water inlet（b1）, the second water inlet（b1）By pipeline successively with first flowmeter（a5）, first supercharging Pump（a4）Connection；Ozone pre-oxidation retort（b3）Right side middle and lower part arrange the second outlet（b10）, the second outlet （b10）By pipeline successively with the 3rd valve（b11）, the second booster pump（b12）, the 3rd non-return valve（b13）Connection.

4. a kind of sound according to claim 1, light and ozone coupling process the device of organic wastewater, it is characterised in that：Institute State coupling oxidation system（c）Including coupling oxidation reaction pond（c1）, supersonic generator（c2）, ultrasound wave vibration plate（c3）、 Uviol lamp（c4）, uviol lamp power supply（c5）And quartz ampoule（c6）；The coupling oxidation reaction pond（c1）Cell body（c7）It is one Hexagonal prism, cell body（c7）There are six sides, ultrasound wave vibration plate（c3）It is installed to cell body（c7）Medial surface, ultrasound wave vibration plate （c3）Can not be less than the 1/5 of medial surface area, six sides are both provided with ultrasound wave vibration plate（c3）, the ultrasound wave vibration plate（c3） By the first wire（c12）With supersonic generator（c2）Connection；The coupling oxidation reaction pond（c1）Centrally disposed one Quartz ampoule（c6）, quartz ampoule（c6）It is the hollow pipe of one end open, quartz ampoule（c6）By the fixed support at the top of cell body（c8） It is fixed, quartz ampoule（c6）Opening upward, uviol lamp（c4）Insertion quartz ampoule（c6）Inside cavity passes through the second wire（c9） With uviol lamp power supply（c5）Connection；The coupling oxidation reaction pond（c1）Bottom the second disc type aeration tube is installed（c12）, institute State coupling oxidation reaction pond（c1）Cell body（c7）Side arrange by the 3rd outlet（c10）, clear water reserviors（d）By pipeline With the 3rd outlet（c10）Connection, in the 3rd outlet（c10）And clear water reserviors（d）Between be provided with the 4th valve（c11）, beat Open the 4th valve（c11）, the waste water after process is by the 3rd outlet（c10）Enter clear water reserviors（d）.

5. a kind of method that sound, light and ozone coupling process organic wastewater, it is characterised in that：The method is comprised the following steps：

1., waste water enters wastewater equalization pond（a）Afterwards with alkali liquor or acid solution regulation pH between 4-6, wastewater disposal basin（a）In regulate pH Waste water through water pump send into ozone pre-oxidation response system（b）；

2. ozonator is opened, ozone generating capacity is adjusted for 5g/h-15g/h, ozone pre-oxidation response system（b）Interior is useless Water ozone after ozone pre-oxidation reaches saturated concentration, is then pumped into coupling oxidation system（c）；

3., ozone pre-oxidation response system（b）Interior remaining ozone enters coupling oxidation system from top vent line （c）, open supersonic generator power supply and uviol lamp power supply so that the coupling of ozone oxidation, ultrasound oxidation technology and ultraviolet oxidation Sewage oxidation treatment, the time of staying determine that according to water treatment effect waste water passes through Valved discharge to clearly after reaching treatment effect Pond（d）.

6. the method that a kind of sound according to claim 5, light and ozone coupling process organic wastewater, it is characterised in that：Step It is rapid 1. in acid solution used nitric acid or 5-20% concentration for 5-20% concentration sulphuric acid, the hydrogen-oxygen of alkali liquor used for 10-20% Change the sodium carbonate of the concentration of sodium or 5-20%.