CN106830554B - Treatment method of photovoltaic industrial wastewater - Google Patents
Treatment method of photovoltaic industrial wastewater Download PDFInfo
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Abstract
The invention relates to a method for treating photovoltaic industrial wastewater, which comprises the following steps: adjusting the photovoltaic industrial wastewater in an adjusting tank to homogenize the water quality; introducing the wastewater into an anaerobic biochemical tank, and removing nitrate nitrogen in the wastewater by using a biochemical denitrification method; introducing the wastewater into a sedimentation tank to remove biological sludge in the wastewater, and recycling the sludge settled in the sedimentation tank into an anaerobic biochemical tank; introducing the wastewater into a reaction tank, and removing fluorine ions in the wastewater by adopting a mode of combining chemical reaction precipitation and coagulating sedimentation separation; and introducing the wastewater into a clarification tank to remove chemical sludge in the wastewater, and recycling part of sludge deposited in the clarification tank into a regulating tank. The treatment method of the invention firstly puts forward that part of sludge in the clarification tank is recycled to the regulating tank, thus not only reducing the dosage of fluorine removal substances and the generation amount of chemical sludge, but also greatly improving the removal efficiency of fluorine ions in the treated wastewater and stably keeping the fluorine ions at 4-5 ppm.
Description
Technical Field
The invention relates to a method for treating photovoltaic industrial wastewater.
Background
With the development of electronic industry technology, especially photovoltaic industry technology, the treatment of photovoltaic industry wastewater has become a prominent difficult problem in the water treatment industry. In the electronic industry, a large amount of chemical agents such as hydrofluoric acid, sulfuric acid, phosphoric acid, ammonia water, hydrochloric acid, organic solvents and the like are generally used in the production process, so that discharged wastewater contains a large amount of components which pollute the surrounding environment, and the water pollution and the water resource shortage situation of China are aggravated.
The fluorine-containing and nitrogen-containing wastewater in the electronic industry has the characteristics of large water quantity, complex pollution components, strong pollution, poor biodegradability, high content of total dissolved solid salt (TDS), total nitrogen and fluoride and the like. At present, photovoltaic enterprises do not have mature and effective treatment methods for the type of wastewater, and generally can only discharge the wastewater into a municipal sewage treatment plant for centralized treatment after simple defluorination treatment. Due to poor biodegradability of the wastewater (BOD/COD is less than 0.1) and the limitation of the process technology of municipal sewage treatment plants, the total nitrogen in the effluent often does not reach the standard, thus easily causing eutrophication of the discharged water body, and particularly, certain specific pollutants (such as fluorine) can not be effectively removed and the concentration can only be reduced by dilution. In the environmental protection of the growing environment, the state requires industrial enterprises to implement the policy of 'energy conservation and emission reduction', and in the environmental evaluation and the approval of industrial enterprises and water consumers, the wastewater is required to reach a certain reuse rate, and the conventional treatment method cannot effectively reduce the emission of pollutants, and cannot effectively reduce the emission of the wastewater through the regeneration and reuse of the wastewater, so that the circular economy is realized. Therefore, the treatment process must be improved in the wastewater treatment process, so that the discharge amount of pollutants is reduced to the maximum extent, the pollution to the surrounding environment is reduced, the regeneration and reuse rate of the wastewater is improved, and precious water resources are saved.
At present, for the treatment of photovoltaic industrial wastewater, the total nitrogen and fluorine ions in the wastewater are removed by the wastewater according to the procedures of a nitrogen removal procedure, a fluorine removal procedure and the like, the content of the fluorine ions in the treated wastewater is less than 10ppm, the content of the fluorine ions in the specifically treated wastewater can fluctuate greatly, the quality of the treated wastewater is not favorably controlled, and when the wastewater is treated, more sludge is produced, and the sludge is generally conveyed to a sludge treatment tank for uniform treatment. However, from the conventional processing situation, the following problems mainly exist: 1. the dosage of the substances for removing the total nitrogen and the fluoride ions is larger; 2. the cost of wastewater treatment is high; 3. the content of fluorinion in the treated wastewater is unstable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for treating photovoltaic industrial wastewater.
In order to solve the technical problems, the invention adopts the following technical scheme:
a treatment method of photovoltaic industrial wastewater, wherein the content of fluorine ions in the photovoltaic industrial wastewater is not higher than 20mg/L, the content of total nitrogen in the photovoltaic industrial wastewater is not higher than 100mg/L, and the pH value of the wastewater is 6-9, and the method comprises the following steps:
step (1), carrying out a regulating procedure on the photovoltaic industrial wastewater in a regulating reservoir to homogenize the water quality;
step (2), introducing the wastewater subjected to the step (1) into an anaerobic biochemical pond, and removing nitrate nitrogen in the wastewater by using a biochemical denitrification method;
step (3), introducing the wastewater subjected to the step (2) into a sedimentation tank to remove biological sludge in the wastewater, and recycling part of sludge settled in the sedimentation tank into the anaerobic biochemical tank in the step (2);
step (4), introducing the wastewater subjected to the step (3) into a reaction tank, and removing fluorine ions in the wastewater by adopting a mode of combining chemical reaction precipitation and coagulating sedimentation separation;
and (5) introducing the wastewater subjected to the step (4) into a clarification tank to remove chemical sludge in the wastewater to obtain treated wastewater, and recycling part of sludge deposited in the clarification tank into the regulating tank in the step (1).
Further, in the step (3), the mass of the partial sludge is 40-60% of the total mass of the sludge generated in the sedimentation tank.
Furthermore, in the step (3), the mass of the partial sludge is 45-55% of the total mass of the sludge generated in the sedimentation tank.
Further, in the step (5), the mass of the partial sludge is 15-25% of the total mass of the sludge generated in the clarification tank.
Further, in the step (5), part of the sludge in the clarification tank is recycled to the regulation tank in the step (1) at the frequency of 2 times per week.
In the step (2), the biochemical denitrification method is to introduce small molecular organic matters which are easy to be biochemically generated into the wastewater so that nitrate nitrogen in the wastewater is converted into nitrogen gas under the action of denitrifying bacteria and is removed.
Furthermore, the small molecular organic substance which is easy to be biochemically generated is acetic acid.
Further, in the step (4), the chemical reaction precipitation is to add a substance containing calcium ions into the wastewater and react fluoride ions in the wastewater to convert into calcium fluoride under the condition of pH 6-7.
Still further, the calcium ion-containing material is one or more selected from calcium oxide, calcium hydroxide or soluble calcium salt.
Furthermore, the coagulating sedimentation separation means that the generated calcium fluoride is chemically destabilized to form flocs under the action of a coagulant to enhance the sedimentation effect.
Preferably, the coagulant is one or a combination of several selected from various coagulants conventional in the technical field of wastewater treatment, such as polyaluminium chloride (PAC), Polyacrylamide (PAM) and the like.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
the treatment method of the invention firstly proposes that part of sludge in the clarification tank is recycled to the regulating tank, thereby reducing the dosage of fluorine removal substances and the generation amount of chemical sludge and reducing the treatment cost of wastewater; in addition, the removal efficiency of the fluoride ions in the wastewater treated by the method is greatly improved, and the fluoride ions can be stably kept at 4-5 ppm without generating large fluctuation, so that the water quality of the treated wastewater is favorably controlled.
Drawings
FIG. 1 is a process flow diagram of the treatment process of the present invention;
wherein: 1. a regulating tank; 2. an anaerobic biochemical tank; 3. a sedimentation tank; 4. a reaction tank; 5. a clarification tank.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the following examples.
As shown in figure 1, the photovoltaic industrial wastewater treatment device comprises a regulating tank 1, an anaerobic biochemical tank 2, a sedimentation tank 3, a reaction tank 4 and a clarification tank 5 which are sequentially communicated.
Example 1
The processing method comprises the following steps:
step (1), carrying out a regulating procedure on the photovoltaic industrial wastewater in a regulating tank 1 so as to homogenize the water quality;
step (2), introducing the wastewater subjected to the step (1) into an anaerobic biochemical pond 2, and removing nitrate nitrogen in the wastewater by adopting a biochemical denitrification method, wherein 2.7-3.2 mg of acetic acid is required to be added when 1mg of nitrate nitrogen in the wastewater is removed;
step (3), introducing the wastewater subjected to the step (2) into a sedimentation tank 3 to remove biological sludge in the wastewater;
step (4), introducing the wastewater subjected to the step (3) into a reaction tank 4, and removing fluoride ions in the wastewater by adopting a mode of combining chemical reaction precipitation and coagulating sedimentation separation, wherein the addition amount of calcium hydroxide is added according to the proportion of adding 50g of calcium hydroxide into 1 ton of wastewater, and the addition amount of a coagulant is added according to the proportion of adding 250g of coagulant into 1 ton of wastewater;
and (5) introducing the wastewater subjected to the step (4) into a clarification tank 5 to remove suspended matters in the wastewater to obtain treated wastewater. The contents of the main pollutants in the wastewater before and after the treatment are shown in Table 1.
Example 2
Sludge, which accounts for 50% of the total weight of the sludge produced in the sedimentation tank 3 of example 1, is returned to the anaerobic biochemical tank 2, and sludge, which accounts for 20% of the total weight of the sludge produced in the clarification tank 5 of example 1, is returned to the conditioning tank 1. Then the treatment is carried out according to the following steps:
step (1), carrying out a regulating procedure on the photovoltaic industrial wastewater in a regulating tank 1 so as to homogenize the water quality;
step (2), introducing the wastewater subjected to the step (1) into a biochemical pond 2, and removing nitrate nitrogen in the wastewater by adopting a chemical biochemical denitrification method, wherein the addition amount of acetic acid is generally added according to the proportion that 1mg of nitrate nitrogen in the wastewater needs 2.7-3.2 mg of acetic acid;
step (3), introducing the wastewater subjected to the step (2) into a sedimentation tank 3 to remove biological sludge in the wastewater;
step (4), introducing the wastewater subjected to the step (3) into a reaction tank 4, and removing fluoride ions in the wastewater by adopting a mode of combining chemical reaction precipitation and coagulating sedimentation separation, wherein the addition amount of calcium hydroxide is that the calcium hydroxide is added according to the proportion that 40g of calcium hydroxide is added into 1 ton of wastewater, and the addition amount of a coagulant is that the coagulant is added according to the proportion that 200g of coagulant is added into 1 ton of wastewater;
and (5) introducing the wastewater subjected to the step (4) into a clarification tank 5 to remove suspended matters in the wastewater to obtain treated wastewater. The contents of the main pollutants in the wastewater before and after the treatment are shown in Table 1.
TABLE 1
The present invention is described in detail in order to make those skilled in the art understand the content and practice the invention, and the invention is not limited to the above embodiments, and all equivalent changes or modifications made according to the spirit of the invention should be covered by the scope of the invention.
Claims (8)
1. The method for treating the photovoltaic industrial wastewater comprises the following steps of (1) treating the photovoltaic industrial wastewater, wherein the content of fluorine ions in the photovoltaic industrial wastewater is not higher than 20mg/L, the content of total nitrogen in the photovoltaic industrial wastewater is not higher than 100mg/L, and the pH value of the wastewater is 6-9, and is characterized in that: the method comprises the following steps:
step (1), carrying out a regulating procedure on the photovoltaic industrial wastewater in a regulating reservoir to homogenize the water quality;
step (2), introducing the wastewater subjected to the step (1) into an anaerobic biochemical pond, and removing nitrate nitrogen in the wastewater by using a biochemical denitrification method;
step (3), introducing the wastewater subjected to the step (2) into a sedimentation tank to remove biological sludge in the wastewater, and recycling part of sludge settled in the sedimentation tank into the anaerobic biochemical tank in the step (2); the mass of the partial sludge is 40-60% of the total mass of the sludge generated in the sedimentation tank;
step (4), introducing the wastewater subjected to the step (3) into a reaction tank, and removing fluorine ions in the wastewater by adopting a mode of combining chemical reaction precipitation and coagulating sedimentation separation;
step (5), introducing the wastewater subjected to the step (4) into a clarification tank to remove chemical sludge in the wastewater to obtain treated wastewater, and recycling part of sludge deposited in the clarification tank into the regulating tank in the step (1); the mass of the partial sludge is 15-25% of the total mass of the sludge generated in the clarification tank.
2. The method for treating photovoltaic industrial wastewater according to claim 1, wherein: in the step (3), the mass of the partial sludge is 45-55% of the total mass of the sludge generated in the sedimentation tank.
3. The method for treating photovoltaic industrial wastewater according to claim 1, wherein: in the step (5), part of sludge in the clarifying tank is recycled to the regulating tank in the step (1) according to the frequency of 2 times per week.
4. The method for treating photovoltaic industrial wastewater according to claim 1, wherein: in the step (2), the biochemical denitrification method is to introduce micromolecular organic matters which are easy to be biochemically generated into the wastewater so that nitrate nitrogen in the wastewater is converted into nitrogen gas under the action of denitrifying bacteria and is removed.
5. The method for treating photovoltaic industrial wastewater according to claim 4, wherein: the micromolecular organic matter which is easy to be biochemically generated is acetic acid.
6. The method for treating photovoltaic industrial wastewater according to claim 1, wherein: in the step (4), the chemical reaction precipitation is to add a substance containing calcium ions into the wastewater and react fluoride ions in the wastewater to convert the fluoride ions into calcium fluoride under the condition of pH 6-7.
7. The method for treating photovoltaic industrial wastewater according to claim 6, wherein: the calcium ion-containing substance is one or more of calcium oxide, calcium hydroxide or soluble calcium salt.
8. The method for treating photovoltaic industrial wastewater according to claim 6, wherein: the coagulating sedimentation separation means that the generated calcium fluoride is subjected to chemical destabilization under the action of a coagulant to form flocs so as to enhance the sedimentation effect.
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| CN108033641A (en) * | 2017-12-22 | 2018-05-15 | 无锡德宝水务投资有限公司 | A kind of photovoltaic industry waste water treatment system |
| CN109879550B (en) * | 2019-04-08 | 2023-11-21 | 重庆港力环保股份有限公司 | Photovoltaic cell production wastewater purification system |
| CN112479486B (en) * | 2020-11-10 | 2021-11-26 | 南京大学 | Denitrification and defluorination co-treatment method for low-nitrogen and fluorine wastewater |
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| CN105152489A (en) * | 2015-09-22 | 2015-12-16 | 苏州科技学院 | Method for treatment of waste water containing fluorinions and nitrate ions |
| CN105461106A (en) * | 2015-11-25 | 2016-04-06 | 北京翰祺环境技术有限公司 | Optimization of wastewater fluorine-removal method and process through sludge refluxing effect |
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| CN102126799B (en) * | 2011-01-17 | 2012-06-20 | 无锡德宝水务投资有限公司 | Method for treating fluorine-containing and ammonia nitrogen-containing waste water in electronic industry |
| CN103848522B (en) * | 2014-03-26 | 2015-06-10 | 南京大学环境规划设计研究院有限公司 | Method for treating fluorine-containing wastewater and recycling fluorine-containing sludge produced by treatment of fluorine-containing wastewater |
| CN105417842A (en) * | 2015-11-12 | 2016-03-23 | 中新苏州工业园区环保技术有限公司 | Advanced treatment method for high-concentration degradation-resistant liquid crystal electronic industrial wastewater |
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| CN105152489A (en) * | 2015-09-22 | 2015-12-16 | 苏州科技学院 | Method for treatment of waste water containing fluorinions and nitrate ions |
| CN105461106A (en) * | 2015-11-25 | 2016-04-06 | 北京翰祺环境技术有限公司 | Optimization of wastewater fluorine-removal method and process through sludge refluxing effect |
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