CN106467349B - High-concentration acidic organic wastewater treatment system and method - Google Patents
High-concentration acidic organic wastewater treatment system and method Download PDFInfo
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Abstract
The invention discloses a high-concentration acidic organic wastewater treatment system and a method, comprising a micro-electrolysis reactor, an adjusting sedimentation tank and an IC reactor internally provided with micro-electrolysis filler; the micro-electrolysis reactor comprises a tank body, micro-electrolysis fillers and an aeration system; the adjusting sedimentation tank comprises a tank body, a dosing machine and a stirrer; the IC reactor with the built-in micro-electrolysis filler comprises a tank body, a mixing zone, a 1 st anaerobic zone, a 2 nd anaerobic zone and a precipitation zone, wherein the micro-electrolysis filler is arranged in the 1 st anaerobic zone and the 2 nd anaerobic zone. The invention is characterized in that the micro-electrolysis and the IC reactor are reasonably combined together, the pH value and the biodegradability of organic matters of the wastewater after the micro-electrolysis treatment are improved, and conditions are provided for the treatment of the IC reactor; micro-electrolysis filler is arranged in the IC reactor to provide enough electrons for a reaction system and reduce oxidation-reduction potential. The invention has simple equipment, small occupied area and high treatment effect, and is suitable for treating various organic wastewater.
Description
Technical Field
The invention relates to the technical field of industrial sewage treatment, in particular to a high-concentration acidic organic wastewater treatment system and a high-concentration acidic organic wastewater treatment method, which are suitable for treating high-concentration acidic organic wastewater with characteristics of biotoxicity, difficult degradation, stable chemical property and the like generated in the industries of chemical industry, printing and dyeing, organic material synthesis, pesticides, pharmacy and the like.
Background
With the rapid development of industrial level, the variety and quantity of industrial wastewater are also rapidly increased, the components are more complex, especially high-concentration organic wastewater has the characteristics of strong biological toxicity, difficult degradation and the like, and the treatment of the wastewater is more difficult than that of domestic sewage. The difficulty in biological treatment of high-concentration organic wastewater is mainly caused by the following reasons: the chemical composition and structure of the organic compound itself, and the microbial community has no enzyme aiming at the organic compound to be treated, so that the organic compound has biodegradability; the waste water contains substances with strong biological toxicity or capable of obviously inhibiting the growth of microorganisms, such as pentachlorophenol, polychlorinated biphenyl and other organic halogenated compounds, so that the organic substances cannot be rapidly degraded. Such waste waterThe method mainly has the following characteristics: firstly, the concentration of organic matters in the wastewater is high, and the biodegradability is poor. High concentration organic waste water, such as waste water discharged from coking, pharmaceutical, printing and dyeing industries, and COD in the effluent of the main sectionCrThe concentration is generally about 2000-6000 mg/L, and the effluent of part of working sections even exceeds 10000 mg/L; the biodegradability of such waste water is poor, and most of the waste water BOD5/CODCrLess than 0.3. Secondly, the components of the waste water are complex. The organic matters in the wastewater are abundant in aromatic compounds, heterocyclic compounds and halogenated compounds, and part of the wastewater contains toxic and harmful substances such as sulfide, nitride, heavy metal ions and the like, so that the wastewater is strong in biotoxicity and difficult to biochemically treat. Thirdly, the wastewater has high chroma and peculiar smell. Part of the waste water is turbid and emits pungent odor, which brings adverse effects to the surrounding environment. Fourthly, the waste water has strong acidity and basicity. The high-concentration organic wastewater discharged in industrial production often has strong acid or strong alkalinity, and is not beneficial to the further treatment of the wastewater. The pollution of the waste water to the environment is increasingly prominent, and the health and the safety of human beings are seriously threatened.
Disclosure of Invention
The technical problems to be solved by the invention are as follows:
the high-concentration acidic organic wastewater often contains a large amount of toxic and harmful compounds, and the activity of microorganisms can be obviously inhibited, so that the treatment rate of the IC reactor is obviously reduced; meanwhile, the biological toxicity of the compound and the slow electron transfer rate are two key factors limiting the anaerobic degradation rate, and the limitation of the electron transfer rate causes the processing rate of the IC reactor to be further slowed down.
The invention aims to provide a system and a method for treating high-concentration acidic organic wastewater, which are suitable for treating the high-concentration acidic organic wastewater with the characteristics of biotoxicity, difficult degradation, stable chemical property and the like generated in the industries of chemical industry, printing and dyeing, organic material synthesis, pesticides, pharmacy and the like.
The invention has the outstanding characteristics that the micro-electrolysis and the IC reactor are reasonably combined together, the pH value and the biodegradability of organic matters of the wastewater after the micro-electrolysis treatment are improved, and conditions are provided for the further treatment of the IC reactor; the adjusting sedimentation tank is not only beneficial to the sedimentation of pollutants, but also the dosing machine arranged at the top of the adjusting sedimentation tank can realize the effective regulation and control of the water inlet of the IC reactor by adding various reagents; the micro-electrolysis filler is arranged in the IC reactor, so that not only can enough electrons be provided for a reaction system and the oxidation-reduction potential be reduced, but also enough activated sludge in the reaction system can be maintained.
The device has the advantages of low energy consumption, simple process, stable system operation, wide raw material source, high treatment efficiency, reusability and the like, and is widely used for treating the printing and dyeing wastewater, the pharmaceutical wastewater, the landfill leachate, the chemical wastewater and other wastewater which are difficult to treat.
The invention provides a high-concentration acidic organic wastewater treatment system, which comprises a micro-electrolysis reactor, a regulating sedimentation tank and an IC reactor internally provided with micro-electrolysis fillers; the device is characterized in that the micro-electrolysis reactor comprises a tank body, micro-electrolysis fillers, a sludge discharge hopper positioned at the bottom of the tank body and an overflow port positioned at the top of a filler area of the tank body, wherein a water inlet system and an aeration system are arranged at the bottom of the tank body; the adjusting sedimentation tank comprises a tank body, a sludge discharge hopper positioned at the bottom of the tank body, and a dosing machine and a stirrer positioned at the top of the tank body, wherein the bottom and the top of the tank body are respectively provided with a water inlet system and an overflow port; the IC reactor with the built-in micro-electrolysis filler sequentially comprises a sludge discharge hopper, a mixing area, a water inlet system, a 1 st anaerobic area, the micro-electrolysis filler, a solid-liquid separator, a 2 nd anaerobic area, the micro-electrolysis filler, a settling area, a solid-liquid separator, an overflow port, a gas-liquid separator and a filler replacing port positioned on the side wall of a micro-electrolysis filler area of the reactor from bottom to top; the wastewater sequentially passes through the micro-electrolysis reactor, the adjusting sedimentation tank and the IC reactor internally provided with the micro-electrolysis filler and is discharged from an overflow port of the IC reactor internally provided with the micro-electrolysis filler.
The micro-electrolysis reactor utilizes a larger potential difference between iron and carbon, takes iron with low potential as an anode and carbon with high potential as a cathode to form a large number of micro-galvanic cells and cause electrochemical corrosion of the iron, and Fe is formed in the presence of oxygen2+And Fe3+Using Fe2+And Fe3+And the reaction product thereof and the pollutant have physical and chemical reactions such as complexation, flocculation, adsorption, precipitation and the like to effectively remove PO4 3-、S2-Various contaminants such as SS; meanwhile, free radicals with strong oxidizing capability generated by micro-electrolysis can obviously improve the biodegradability of the organic matters.
The micro-electrolysis reactor is used for the pretreatment of high-concentration acidic organic wastewater, can effectively neutralize the acidity of the wastewater, improve the pH value of the wastewater, remarkably improve the biodegradability of refractory organic matters, reduce the turbidity and the chromaticity of water, and is favorable for further biochemical treatment of the wastewater.
The IC reactor is also called an internal circulation anaerobic reactor and is formed by connecting 2 layers of UASB reactors in series. The IC reactor automatically dilutes the inlet water through internal circulation, so that the stability of the inlet water concentration of the 1 st anaerobic zone is effectively ensured; secondly, the IC reactor has the advantages of high impact load resistance, high volume load, investment saving and the like, and is suitable for treating high-concentration organic wastewater. Micro-electrolysis fillers are arranged in a 1 st anaerobic zone and a 2 nd anaerobic zone of the IC reactor, and iron in the micro-electrolysis fillers can provide sufficient electrons for a reaction system and remarkably reduce the oxidation-reduction potential of the reaction system; meanwhile, the carbon fiber in the micro-electrolysis filler has good conductivity and huge specific surface area, is beneficial to the rapid transfer of electrons between iron and microorganisms, and is beneficial to maintaining the sufficient amount of activated sludge in a reaction system.
Preferably, the cathode material of the microelectrolysis filler of the microelectrolysis reactor is carbon-containing materials such as activated carbon, carbon fiber and graphite, and the anode material is iron wire, iron block, iron pipe and iron-containing materials such as iron-containing alloy.
Preferably, the medicament added into the dosing machine of the adjusting sedimentation tank is a mixed solution of one or more of pH adjusting agent, hydrogen peroxide, organic carbon source, flocculating agent, trace element nutrient solution, redox mediator and other reagents; the redox mediator is one or a mixture of anthraquinone, cobalamin, viologen, phenazine, naphthoquinone and derivatives of the substances.
Preferably, the fibrous material woven by carbon fiber and iron wire is used as the micro-electrolysis filler in the IC reactor with the built-in micro-electrolysis filler, the filling volume ratio of the micro-electrolysis filler in the anaerobic zone of the IC reactor with the built-in micro-electrolysis filler is 5-50%, the mass ratio is 10-1 g/L, and the mass ratio of iron to carbon in the micro-electrolysis filler is 10-2; the carbon fiber is one of carbon fiber materials such as viscose-based carbon fiber, pitch-based carbon fiber, polyacrylonitrile-based carbon fiber and the like.
Preferably, the waste gas discharged by the gas-liquid separator of the IC reactor with the built-in micro-electrolysis filler can be used for generating electricity or heat to provide energy for the whole treatment system.
The invention provides a method for treating high-concentration acidic organic wastewater by adopting the sewage treatment system in the technical scheme.
Preferably, the method is applied to the treatment of high-concentration acidic organic wastewater, in particular to the treatment of halogenated organic wastewater which contains pentachlorophenol, polychlorinated biphenyl and the like and is strong in toxicity and difficult to degrade.
Preferably, the IC reactor with the micro-electrolysis filler built in the method can be operated independently.
Preferably, the method can be used for treating high-concentration acidic organic wastewater and can also be used for treating other types of wastewater containing refractory organic matters.
The invention has the beneficial effect that the invention provides a high-concentration acidic organic wastewater treatment system, which comprises a micro-electrolysis reactor, a regulating sedimentation tank and an IC reactor internally provided with micro-electrolysis filler. When high-concentration acidic organic wastewater passes through the micro-electrolysis reactor, the micro-electrolysis reaction can be effectively promoted due to the low pH value of inlet water, the pH value of a water body is obviously improved along with the continuous corrosion of iron, and the pH value of outlet water is close to neutral; the following reactions mainly occur during this process: [ H ] produced by a mono-or microelectrolytic reaction]The non-degradable organic matter and zero-valent iron have strong reducibility, and can effectively reduce non-degradable organic matters generated in the industries of chemical industry, printing and dyeing, pharmacy, electroplating and the like such as caprolactam, methyl orange, azo dyes and the like, destroy double bonds and cyclic groups of partial organic matters, improve the biodegradability of the non-degradable organic matters, and simultaneously can reduce partial high-valence toxic metal ions and reduce the biochemical toxicity of the non-degradable organic matters; second, Fe generated in the electrode reaction process2+And Fe3+At hydrolysis or pH adjustmentWhen alkaline, a large amount of Fe (OH) is formed2And Fe (OH)3The hydrolysate is a good flocculating agent, and the removal effect of the wastewater pollutants can be enhanced through physical adsorption, chemical adsorption, flocculation, coagulation, coprecipitation and other modes; III, Fe2+、Fe3+Can be connected with CN-、S2 -、PO4 3-The chemical reactions of complexation, precipitation and the like are carried out on various inorganic ions, the biotoxicity of various harmful substances is reduced, and the wastewater with black and smelly color and Fe2+、Fe3+The water transparency can be obviously improved, part of peculiar smell substances can be removed, and the treatment load of a subsequent treatment process can be reduced.
After the wastewater enters a regulating sedimentation tank, Fe (OH) is generated due to the micro-electrolysis process2And Fe (OH)3The flocculant is a good flocculant, granular pollutants and part of soluble pollutants in the wastewater in the working section can be effectively precipitated and removed, and the pH value of the wastewater is adjusted to meet the biochemical treatment requirement through a dosing machine; adding organic carbon source, trace element nutrient solution and other substances through a dosing machine to adjust the wastewater to the biochemical treatment requirement; for halogen-to-be-treated organic matters which are contained in the wastewater and have strong biological toxicity and are difficult to degrade, such as pentachlorophenol, polychlorinated biphenyl and the like, a proper amount of redox mediator is added through a dosing machine, so that the transfer rate of electrons in an anaerobic reaction system is improved, and the anaerobic degradation process of the IC reactor is effectively promoted.
After the effluent of the adjusting sedimentation tank reaches an IC reactor internally provided with micro-electrolysis filler, the high-concentration organic wastewater is effectively diluted through the wastewater backflow, so that the degradation of activated sludge is facilitated; the micro-electrolysis filler positioned in the 1 st anaerobic zone and the 2 nd anaerobic zone can provide enough electrons for an anaerobic reaction system, and the oxidation-reduction potential of the reaction system is obviously reduced; meanwhile, the carbon fiber in the micro-electrolysis filler has good conductivity and huge specific surface area, is beneficial to the rapid transfer of electrons between iron and microorganisms, and is beneficial to maintaining the sufficient amount of activated sludge in a reaction system. The wastewater passes through an IC reactor with a built-in micro-electrolysis filler, and the water quality is effectively purified.
The method provided by the invention has the advantages that various pollutants are removed more thoroughly, pollutants such as refractory organic matters, suspended matters and the like are obviously removed, the waste metal iron is used as a cathode material of micro-electrolysis, a large amount of medicament is not required to be added, the flow is simple, the occupied area is small, the treatment cost is low, and the operation is convenient.
Drawings
FIG. 1 is a schematic diagram of a high concentration acidic organic wastewater treatment system.
Fig. 2 is a schematic structural diagram of an IC reactor microelectrolytic filler with a built-in microelectrolytic filler.
Description of reference numerals:
in FIG. 1, 1-micro-electrolysis reactor; 2-adjusting a sedimentation tank; 3-an IC reactor with built-in micro-electrolysis filler; 4-tank body; 5-a water inlet system; 6-a mud discharging hopper; 7-an aeration system; 8-micro-electrolysis filler; 9-an overflow port; 10-a water intake system; 11-a mud bucket; 12-a tank body; 13-a dosing machine; 14-a stirrer; 15-an overflow port; 16-a mud bucket; 17-a mixing zone; 18-the 1 st anaerobic zone; 19-2 nd anaerobic zone; 20-filler replacement port; 21-micro-electrolysis filler; 22-a tank body; 23-a solid liquid separator; 24-a precipitation zone; 25-a gas-liquid separator; 26-an overflow port;
Detailed Description
As shown in figure 1, the invention provides a high-concentration acidic organic wastewater treatment system, which comprises a micro-electrolysis reactor (1), a regulating sedimentation tank (2) and an IC reactor (3) with a built-in micro-electrolysis filler; the device is characterized in that the micro-electrolysis reactor (1) comprises a tank body (4), micro-electrolysis fillers (8), a sludge discharge hopper (6) positioned at the bottom of the tank body and an overflow port (9) positioned at the top of a filler area of the tank body, wherein the bottom of the tank body is provided with a water inlet system (5) and an aeration system (7); the adjusting sedimentation tank (2) comprises a tank body (12), a sludge discharge hopper (11) positioned at the bottom of the tank body, a chemical dosing machine (13) and a stirrer (14) positioned at the top of the tank body, wherein the bottom and the top of the tank body are respectively provided with a water inlet system (10) and an overflow port (15); the tank body (22) of the IC reactor (3) with the built-in micro-electrolysis filler is sequentially provided with a mixing area (17), a 1 st anaerobic area (18), a 2 nd anaerobic area (19), a settling area (24), an overflow port (26) and a gas-liquid separator (25) from bottom to top, the micro-electrolysis filler (21) is arranged in the 1 st anaerobic area (18) and the 2 nd anaerobic area (19), a filler replacing port (20) is arranged on the side wall of the tank body, and a sludge discharge hopper (16) is arranged at the bottom; the wastewater sequentially passes through the micro-electrolysis reactor (1), the adjusting sedimentation tank (2) and the IC reactor (3) with the built-in micro-electrolysis filler and is discharged from an overflow port (26) of the IC reactor (11) with the built-in micro-electrolysis filler.
The invention provides a method for treating high-concentration acidic organic wastewater; the wastewater firstly flows from a water inlet system (5) to the micro-electrolysis reactor (1), an aeration system (7) provides sufficient air for the wastewater, and the wastewater is effectively treated by the micro-electrolysis reactor (1) and then flows to the adjusting sedimentation tank (2) from an overflow port (9); part of pollutants in the wastewater can be removed through effective precipitation of the adjusting sedimentation tank (2), various reagents are added into the adjusting sedimentation tank (2) through a dosing machine (13), the wastewater in the adjusting sedimentation tank (2) meets the requirements of biochemical treatment, and the wastewater reaches an IC reactor (3) with a built-in micro-electrolysis filler through an overflow port (15); the wastewater is effectively diluted and mixed in the mixing zone (17), so that the degradation of activated sludge in the 1 st anaerobic zone (18) is facilitated, and the microelectrolysis filler (21) positioned in the 1 st anaerobic zone (18) and the 2 nd anaerobic zone (19) can provide enough electrons for an anaerobic reaction system, and the oxidation-reduction potential of the reaction system is remarkably reduced; meanwhile, the carbon fiber in the micro-electrolysis filler (21) has good conductivity and huge specific surface area, which is beneficial to the rapid transfer of electrons between iron and microorganisms, and the carbon fiber is beneficial to maintaining the sufficient amount of activated sludge in a reaction system; the wastewater is fully degraded and purified in the 1 st anaerobic zone (18) and the 2 nd anaerobic zone (19), solid-liquid separation is carried out at a solid-liquid separator (23), and the wastewater is discharged from an overflow port (26). Thereby realizing the treatment of high-concentration acidic organic wastewater.
The method is applied to treating high-concentration acidic organic wastewater, in particular to treating high-toxicity and difficult-to-degrade halogenated organic wastewater containing pentachlorophenol, polychlorinated biphenyl and the like; in the method, an IC reactor with built-in micro-electrolysis filler can independently operate; the method can be used for treating high-concentration acidic organic wastewater and can also be used for treating other types of wastewater containing refractory organic matters.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. A high-concentration acidic organic wastewater treatment system comprises a micro-electrolysis reactor, an adjusting sedimentation tank and an IC reactor internally provided with micro-electrolysis fillers; it is characterized in that the preparation method is characterized in that,
the micro-electrolysis reactor comprises a tank body, micro-electrolysis fillers, a sludge discharge hopper positioned at the bottom of the tank body, an overflow port positioned at the top of a filler area of the tank body, a water inlet system and an aeration system at the bottom of the tank body;
the adjusting sedimentation tank comprises a tank body, a sludge discharge hopper positioned at the bottom of the tank body, a dosing machine and a stirrer positioned at the top of the tank body, a water inlet system at the bottom of the tank body and an overflow port at the top of the tank body;
the IC reactor with the built-in micro-electrolysis filler sequentially comprises a sludge discharge hopper, a mixing area, a water inlet system, a 1 st anaerobic area, the micro-electrolysis filler, a solid-liquid separator, a 2 nd anaerobic area, the micro-electrolysis filler, a settling area, a solid-liquid separator, an overflow port, a gas-liquid separator and a filler replacing port positioned on the side wall of a micro-electrolysis filler area of the reactor from bottom to top;
the IC reactor with the built-in micro-electrolysis filler takes a fibrous material woven by carbon fibers and iron wires as the micro-electrolysis filler.
2. The high concentration acidic organic wastewater treatment system according to claim 1, wherein the cathode material of the micro-electrolysis filler in the micro-electrolysis reactor is one of activated carbon, carbon fiber and graphite, and the anode material is one of iron wire, iron block, iron pipe and iron-containing alloy.
3. The system for treating high-concentration acidic organic wastewater according to claim 1, wherein the chemical added by the chemical adding machine in the adjusting sedimentation tank is a mixed solution of one or more reagents selected from a pH adjusting agent, hydrogen peroxide, an organic carbon source, a flocculating agent, a trace element nutrient solution and a redox mediator.
4. The high-concentration acidic organic wastewater treatment system according to claim 1, wherein the volume ratio of the microelectrolytic filler in the anaerobic zone of the IC reactor with the built-in microelectrolytic filler is 5-50%, the mass ratio of the microelectrolytic filler is 10-1 g/L, and the iron/carbon mass ratio of the microelectrolytic filler is 10-2; the carbon fiber is one of viscose-based carbon fiber, pitch-based carbon fiber and polyacrylonitrile-based carbon fiber.
5. The high-concentration acidic organic wastewater treatment system according to claim 1, wherein the micro-electrolysis reactor takes a fibrous material woven by carbon fibers and iron wires as a micro-electrolysis filler, the micro-electrolysis filler has a filling volume ratio of 5-50% in the micro-electrolysis reactor, a mass ratio of 10-1 g/L, and an iron/carbon mass ratio of 10-2; the carbon fiber is one of viscose-based carbon fiber, pitch-based carbon fiber and polyacrylonitrile-based carbon fiber.
6. The high concentration acidic organic wastewater treatment system according to claim 3, wherein the redox mediator is one or more of anthraquinone, cobalamin, viologen, phenazine, and naphthoquinone.
7. A method for treating high-concentration acidic organic wastewater, which is characterized in that,
the wastewater firstly enters the micro-electrolysis reactor through the water inlet system, the aeration system provides sufficient air for the micro-electrolysis reactor, and the wastewater is effectively treated by the micro-electrolysis reactor and then reaches the regulating sedimentation tank through the water inlet system through the overflow port;
part of pollutants in the wastewater are removed through effective precipitation of the adjusting sedimentation tank, various reagents are added into the adjusting sedimentation tank through a dosing machine, the wastewater in the adjusting sedimentation tank meets the requirement of biochemical treatment, and the wastewater reaches an IC reactor internally provided with micro-electrolysis filler through an overflow port through a water inlet system;
the wastewater is effectively diluted and mixed in a mixing area of an IC reactor provided with micro-electrolysis filler, the wastewater is fully degraded and purified in a 1 st anaerobic area and a 2 nd anaerobic area, solid-liquid separation is carried out at a solid-liquid separator, the wastewater is discharged from an overflow port,
the IC reactor with the built-in micro-electrolysis filler takes a fibrous material woven by carbon fibers and iron wires as the micro-electrolysis filler.
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| CN113477227B (en) * | 2021-07-30 | 2022-02-01 | 中国环境科学研究院 | Preparation method of grafting reinforced biochar-based heavy metal adsorption material |
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| CN101591064A (en) * | 2009-06-27 | 2009-12-02 | 大连理工大学 | Anaerobic built-in zero-valent iron reactor |
| AU2009304585A1 (en) * | 2008-10-15 | 2010-04-22 | The University Of Queensland | Treatment of solutions or wastewater |
| CN202030620U (en) * | 2011-05-24 | 2011-11-09 | 青岛理工大学 | Straw pulp papermaking middle-section waste water treatment system |
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| AU2009304585A1 (en) * | 2008-10-15 | 2010-04-22 | The University Of Queensland | Treatment of solutions or wastewater |
| CN101591064A (en) * | 2009-06-27 | 2009-12-02 | 大连理工大学 | Anaerobic built-in zero-valent iron reactor |
| CN202030620U (en) * | 2011-05-24 | 2011-11-09 | 青岛理工大学 | Straw pulp papermaking middle-section waste water treatment system |
| CN202390287U (en) * | 2011-12-15 | 2012-08-22 | 西安工程大学 | Internal iron-carbon UASB-SBR (Upflow Anaerobic Sludge Blanket-Sequencing Batch Reactor) coupling system for treatment of printing and dyeing wastewater |
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