CN113735346A - Method for treating organic chemical wastewater - Google Patents
Method for treating organic chemical wastewater Download PDFInfo
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- CN113735346A CN113735346A CN202111083475.8A CN202111083475A CN113735346A CN 113735346 A CN113735346 A CN 113735346A CN 202111083475 A CN202111083475 A CN 202111083475A CN 113735346 A CN113735346 A CN 113735346A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 97
- 239000000126 substance Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 34
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 32
- 238000005189 flocculation Methods 0.000 claims abstract description 26
- 230000016615 flocculation Effects 0.000 claims abstract description 26
- 239000000706 filtrate Substances 0.000 claims abstract description 17
- 239000000701 coagulant Substances 0.000 claims abstract description 15
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000008394 flocculating agent Substances 0.000 claims abstract description 9
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- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 3
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention relates to a method for treating organic chemical wastewater, which belongs to the technical field of wastewater treatment and comprises the following steps: adding a flocculating agent and a coagulant aid into organic chemical wastewater to carry out flocculation precipitation treatment, and filtering to obtain wastewater filtrate; secondly, adding persulfate and hydrogen peroxide into the wastewater filtrate under the ultraviolet irradiation activation condition, and carrying out oxidation reaction while stirring to obtain oxidized water; thirdly, adjusting the pH value of the oxidized effluent by alkali to reach the standard of dischargeable wastewater, obtaining treated wastewater, and discharging the treated wastewater through a drainage pipeline; the method can effectively improve the oxidation capacity of organic matters, the formed composite oxidation system can exert a synergistic oxidation effect, the oxidation reaction rate is greatly improved, and the method has the remarkable characteristics of simple process, quick and efficient reaction, thorough removal of refractory pollutants, low power loss, easily controlled reaction conditions and the like, and has good engineering application value and popularization prospect.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of organic chemical wastewater.
Background
Chemical industry includes two major types, organic chemical industry and inorganic chemical industry, and chemical wastewater discharged from chemical plants is also divided into two major types, inorganic chemical wastewater and organic chemical wastewater. The inorganic chemical wastewater comprises wastewater generated in the production process of preparing acid, alkali and salt basic chemical raw materials from inorganic minerals, and the production mainly comprises cooling water, and the discharged wastewater contains acid, alkali, a large amount of salts and suspended matters, and sometimes contains sulfides, arsenic, mercury, cadmium or lead and other toxic or extremely toxic substances. The organic chemical wastewater has various components, comprises chemical wastewater discharged in the processes of rubber synthesis, plastic synthesis, fiber manufacturing, dye synthesis, paint synthesis, medicine manufacturing and the like, has strong oxygen consumption property, contains toxic substances such as cyanogen, phenol and the like, has toxic influence on organisms and microorganisms under certain concentration, contains phenols, polycyclic aromatic compounds, organic acids, aldehydes, ketones, ethers and other heterocyclic compounds and other components, is typical refractory organic chemical wastewater, has the characteristics of wide pollution range, high harm degree, large treatment difficulty and high treatment cost, and can be connected into a drain pipe to be discharged only by effective treatment.
At present, the organic pollutants difficult to degrade in chemical wastewater are usually treated by adopting advanced oxidation processes such as iron-carbon micro-electrolysis, Fenton oxidation and ozone oxidation, but because the components in the organic chemical wastewater are complex, when the heterocyclic organic matters difficult to degrade such as phenol, nitrobenzene, biphenyl, quinoline and indole are treated by adopting a single advanced oxidation process, the problems of poor removal effect, large residual quantity of the pollutants difficult to degrade, general biodegradability of effluent after treatment, poor biochemical degradation effect, high treatment cost and the like are often faced.
Disclosure of Invention
The invention aims to provide a method for treating organic chemical wastewater, which degrades the organic chemical wastewater into effluent capable of being directly discharged through three steps of flocculation precipitation, ultraviolet activation oxidation and pH adjustment.
The technical problems to be solved by the invention are as follows: how to improve the removal rate of the refractory organic matters in the organic chemical wastewater.
The purpose of the invention can be realized by the following technical scheme:
a method for treating organic chemical wastewater specifically comprises the following steps:
step one, flocculating settling treatment
Pumping the organic chemical wastewater into a flocculation sedimentation tank, adding a flocculating agent and a coagulant aid into the flocculation sedimentation tank, controlling the addition of the flocculating agent to be 100-300mg/L and the addition of the coagulant aid to be 0.2-2mg/L, filtering the organic chemical wastewater by using a screen after flocculation sedimentation is performed for 5-20min, removing suspended impurities, solid particles and part of macromolecular organic pollutants in the organic chemical wastewater, separating out a flocculating body, and treating the flocculating body as solid waste to obtain wastewater filtrate;
step two, ultraviolet light activation oxidation treatment
Pumping the waste water filtrate into an oxidation reaction tank, adding persulfate and hydrogen peroxide into the oxidation reaction tank, and controlling the adding amount of the persulfate to be 0.12-1.2kg/m3The adding amount of hydrogen peroxide is 0.1-1L/m3Keeping the stirring state under the condition of the rotation speed of 150-3Controlling the reaction time to be 0.25-2h to obtain oxidized effluent;
step three, pH adjustment treatment
Pumping the oxidized effluent into a pH adjusting tank, adjusting the pH value of the oxidized effluent to 6.0-7.0 by using alkali to reach the standard of wastewater discharge to obtain treated wastewater, and discharging the treated wastewater through a drainage pipeline.
As a further scheme of the invention, the addition amount of the flocculating agent in the step one is preferably 100-200mg/L, the addition amount of the coagulant aid is preferably 0.25-1mg/L, the flocculation settling time is preferably 5-10min, and the mesh size of the screen is 100-400 meshes.
As a further scheme of the invention, in the first step, the flocculating agent is polymeric ferric sulfate, the polymeric ferric sulfate is an inorganic macromolecular coagulant and is an intermediate compound between ferric sulfate and ferric hydroxide, compared with a common ferric salt coagulant, a hydroxyl polymer formed by the polymeric ferric sulfate has more positive charges, the coagulation effect in the water treatment process is good, and compared with an aluminum salt coagulant, the polymeric ferric sulfate has the advantages of large flocculating body, high settling speed, good low-temperature coagulation performance, no residue and the like; the coagulant aid is nonionic polyacrylamide which is a water-soluble high molecular polymer or polyelectrolyte, and the molecular chain of the coagulant aid contains a certain number of polar groups, so that the coagulant aid can bridge particles by adsorbing suspended solid particles in water or coagulate the particles to form large flocculates by charge neutralization, thereby accelerating the sedimentation of the particles in suspension, and having very obvious effects of accelerating the clarification of solution, promoting filtration and the like.
As a further aspect of the present invention, the persulfate is preferably added in the second step in an amount of 0.12 to 0.6kg/m3The dosage of the hydrogen peroxide is preferably 0.1-0.6L/m3The rotating speed is preferably 150r/min, and the ultraviolet radiation power is preferably 5-10kW/m3The reaction time is preferably 0.5 to 1 hour.
As a further scheme of the invention, the ultraviolet lamps in the step two are immersed ultraviolet germicidal lamps, when in use, a plurality of immersed ultraviolet germicidal lamps are connected and immersed in the wastewater filtrate in the oxidation reaction tank, and the interval of each immersed ultraviolet germicidal lamp is kept uniform, so that each cubic meter of wastewater filtrate can receive ultraviolet radiation in the power range of 3-30 kW.
In a further embodiment of the present invention, in the second step, the mass concentration of the hydrogen peroxide is 27.5%, and the persulfate is sodium persulfate or potassium persulfate.
As a further scheme of the present invention, the wavelength of the ultraviolet light emitted by the ultraviolet light lamp in step two is preferably 254nm, and at the wavelength of the ultraviolet light, the energy absorbed by the phenolic organic matter is converted from a stable state to an excited state, and a chemical reaction occurs in the oxidation reaction tank to generate a readily degradable substance, or the readily degradable substance becomes an intermediate product for initiating a thermal reaction.
As a further scheme of the invention, the pH value in the third step is preferably 6.5-7.0, and the pH value is weakly acidic water.
As a further embodiment of the present invention, the alkali in step three is sodium hydroxide or potassium hydroxide.
Has the advantages that:
aiming at the components such as suspended impurities, solid particles, part of macromolecular organic pollutants and the like in the organic chemical industry wastewater, the invention selects polymeric ferric sulfate and non-ionic polyacrylamide as a flocculating agent and a coagulant aid respectively to carry out flocculation treatment on the wastewater. In the traditional water treatment process, because the polymeric ferric sulfate has low basicity and strong acidity, after the polymeric ferric sulfate is added into wastewater, the pH value of the wastewater is easily reduced, and the coagulation treatment effect of the wastewater is influenced.
According to the invention, persulfate and hydrogen peroxide are activated by ultraviolet light to excite to generate sulfate radicals and hydroxyl radicals, so that the organic pollutants can effectively undergo reactions such as electron transfer, addition, hydrogen substitution and the like, and the organic matters which are difficult to degrade such as phenol, nitrobenzene, biphenyl and the like are subjected to ring opening decomposition to form easily degradable substances, thereby improving the removal rate of the organic matters which are difficult to degrade and achieving the purpose of harmless treatment; meanwhile, part of the organic pollutants (such as phenol) which are difficult to degrade can absorb energy and change from a stable state to an excited state under the irradiation of ultraviolet light with specific wavelength, and the organic pollutants are subjected to chemical reaction in an oxidation reaction tank to generate easily degradable substances or become intermediate products for initiating thermal reaction; ultraviolet light produces direct or indirect degradation effect to some difficult degradation organic pollutant, can effectively improve the oxidizing power to can form compound oxidation system with hydrogen peroxide, persulfate, play synergistic oxidation effect, improve oxidation reaction rate greatly, strengthen the throughput to organic chemical industry waste water.
The invention can achieve the purpose of effectively controlling the degradation rate of pollutants and the reaction time by adjusting the intensity of ultraviolet light, has the remarkable characteristics of simple process, quick and efficient reaction, thorough removal of pollutants difficult to degrade, low power loss, easy control of reaction conditions and the like, and has good engineering application value and popularization prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for treating organic chemical wastewater according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Selecting chemical wastewater biochemical effluent generated by a chemical industry factory as a treatment object, wherein various indexes of the chemical wastewater biochemical effluent are shown in the following table 1:
TABLE 1
Referring to fig. 1, the treatment of the biochemical effluent of the chemical wastewater specifically includes the following steps:
step one, flocculating settling treatment
Pumping biochemical effluent of chemical wastewater into a flocculation sedimentation tank, adding polymeric ferric sulfate and non-ionic polyacrylamide into the flocculation sedimentation tank, controlling the addition of the polymeric ferric sulfate to be 100mg/L and the addition of the non-ionic polyacrylamide to be 0.5mg/L, filtering the organic chemical wastewater by using a 200-mesh screen after flocculation sedimentation is performed for 5min, separating a flocculating constituent, and treating the flocculating constituent as solid waste to obtain wastewater filtrate;
through detection, after the flocculation precipitation treatment, the COD concentration of the wastewater filtrate is reduced to 92mg/L, and the removal rate of the COD in the flocculation precipitation treatment is 54%;
step two, ultraviolet light activation oxidation treatment
Pumping the waste water filtrate into an oxidation reaction tank, adding sodium persulfate and hydrogen peroxide with the mass concentration of 27.5% into the oxidation reaction tank, and controlling the adding amount of the persulfate to be 0.24kg/m3The adding amount of hydrogen peroxide is 0.3L/m3Keeping stirring state at 150r/min, starting ultraviolet lamp, and controlling ultraviolet irradiation power at 7kW/m3Controlling the reaction time to be 0.25h and obtaining oxidized effluent, wherein the wavelength of ultraviolet light is 254 nm;
through detection, the COD concentration of the oxidized effluent is 33mg/L, BOD concentration and 12mg/L, the ammonia nitrogen concentration is 1.1mg/L, the total organic nitrogen is 4mg/L and the total nitrogen is 6 mg/L;
step three, pH adjustment treatment
Pumping the oxidized effluent into a pH adjusting tank, adjusting the pH value of the oxidized effluent to 6.7 by using sodium hydroxide to obtain treated wastewater, and detecting that all indexes of the treated wastewater are shown in the following table 2:
TABLE 2
Example 2
Chemical wastewater biochemical effluent generated by a certain chemical industry factory is selected as a treatment object, and various indexes of the chemical wastewater biochemical effluent are shown in the following table 3:
TABLE 3
Referring to fig. 1, the treatment of the biochemical effluent of the chemical wastewater specifically includes the following steps:
step one, flocculating settling treatment
Pumping biochemical effluent of chemical wastewater into a flocculation sedimentation tank, adding polymeric ferric sulfate and non-ionic polyacrylamide into the flocculation sedimentation tank, controlling the addition of the polymeric ferric sulfate to be 150mg/L and the addition of the non-ionic polyacrylamide to be 0.5mg/L, after flocculation sedimentation is carried out for 5min, filtering the organic chemical wastewater by using a 200-mesh screen, separating out a flocculating constituent, and treating the flocculating constituent as solid waste to obtain wastewater filtrate;
through detection, after the flocculation precipitation treatment, the COD concentration of the wastewater filtrate is reduced to 94mg/L, and the removal rate of the COD in the flocculation precipitation treatment is 57%;
step two, ultraviolet light activation oxidation treatment
Pumping the waste water filtrate into an oxidation reaction tank, adding sodium persulfate and hydrogen peroxide with the mass concentration of 27.5% into the oxidation reaction tank, and controlling the adding amount of the persulfate to be 0.3kg/m3The adding amount of hydrogen peroxide is 0.4L/m3Keeping the stirring state under the condition that the rotating speed is 150r/min, starting an ultraviolet lamp, and controlling the ultraviolet irradiation power to be 6kW/m3Controlling the reaction time to be 0.5h and obtaining oxidized effluent, wherein the wavelength of ultraviolet light is 254 nm;
through detection, the COD concentration of the oxidized effluent is 20mg/L, BOD concentration and 9mg/L, the ammonia nitrogen concentration is 0.4mg/L, the total organic nitrogen is 2mg/L and the total nitrogen is 3 mg/L;
step three, pH adjustment treatment
Pumping the oxidized effluent into a pH adjusting tank, adjusting the pH value of the oxidized effluent to 6.7 by using sodium hydroxide to obtain treated wastewater, and detecting that all indexes of the treated wastewater are shown in the following table 4:
TABLE 4
Example 3
Selecting chemical wastewater biochemical effluent generated by a chemical industry factory as a treatment object, wherein various indexes of the chemical wastewater biochemical effluent are shown in the following table 5:
TABLE 5
Referring to fig. 1, the treatment of the biochemical effluent of the chemical wastewater specifically includes the following steps:
step one, flocculating settling treatment
Pumping biochemical effluent of chemical wastewater into a flocculation sedimentation tank, adding polymeric ferric sulfate and non-ionic polyacrylamide into the flocculation sedimentation tank, controlling the addition of the polymeric ferric sulfate to be 150mg/L and the addition of the non-ionic polyacrylamide to be 0.5mg/L, after flocculation sedimentation is carried out for 7min, filtering the organic chemical wastewater by using a 200-mesh screen, separating out a flocculating constituent, and treating the flocculating constituent as solid waste to obtain wastewater filtrate;
through detection, after the flocculation precipitation treatment, the COD concentration of the wastewater filtrate is reduced to 93mg/L, and the removal rate of the COD in the flocculation precipitation treatment is 55%;
step two, ultraviolet light activation oxidation treatment
Pumping the waste water filtrate into an oxidation reaction tank, adding potassium persulfate and hydrogen peroxide with the mass concentration of 27.5% into the oxidation reaction tank, and controlling the over-sulfurThe amount of the acid salt added was 0.5kg/m3The adding amount of hydrogen peroxide is 0.4L/m3Keeping the stirring state under the condition that the rotating speed is 200r/min, starting an ultraviolet lamp, and controlling the ultraviolet irradiation power to be 8kW/m3Controlling the reaction time to be 1h and obtaining oxidized effluent, wherein the wavelength of ultraviolet light is 254 nm;
through detection, the COD concentration of the oxidized effluent is 11mg/L, BOD concentration and is 6mg/L, the ammonia nitrogen concentration is 0.2mg/L, the total organic nitrogen is 1.3mg/L, and the total nitrogen is 2.6 mg/L;
step three, pH adjustment treatment
Pumping the oxidized effluent into a pH adjusting tank, adjusting the pH value of the oxidized effluent to 6.7 by using potassium hydroxide to obtain treated wastewater, and detecting that all indexes of the treated wastewater are shown in the following table 6:
TABLE 6
Comparative example 1
Selecting chemical wastewater biochemical effluent to be treated with the same index data as in example 1 as a treatment object, adopting an ozone oxidation treatment process, controlling the concentration of ozone in an ozone oxidation contact reactor to be 45mg/L, controlling the ozone contact reaction time to be 40min, adjusting the pH value of the oxidation effluent to be 6.8 by using sodium hydroxide after reaction to obtain treated wastewater, and detecting that the indexes of the treated wastewater are shown in the following table 7:
TABLE 7
Comparative example 2
Selecting the chemical wastewater biochemical effluent to be treated with the same index data as the example 1 as a treatment object, adopting a Fenton oxidation treatment process, firstly adjusting the pH value of the chemical wastewater biochemical effluent to be 3.6, and FeSO4·7H2The dosage of O is 700mg/L, the dosage of hydrogen peroxide with the mass concentration of 27.5 percent is 600mg/L, the temperature is normal temperature, and the reaction time isAnd 2h, adjusting the pH value of the oxidized effluent to 6.8 by using sodium hydroxide after reaction to obtain treated wastewater, and detecting that all indexes of the treated wastewater are shown in the following table 8:
TABLE 8
As can be seen from the index data of the treated wastewater in examples 1-3 and comparative examples 1-2, the treatment method of the invention has better treatment effect on the organic chemical wastewater and stronger treatment capacity on the organic chemical wastewater.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (9)
1. The method for treating the organic chemical wastewater is characterized by comprising the following steps:
pumping organic chemical wastewater into a flocculation sedimentation tank, adding a flocculating agent and a coagulant aid into the flocculation sedimentation tank, controlling the addition of the flocculating agent to be 100-300mg/L and the addition of the coagulant aid to be 0.2-2mg/L, and filtering the organic chemical wastewater by using a screen after flocculation sedimentation is performed for 5-20min, and separating out a flocculating body to obtain wastewater filtrate;
pumping the wastewater filtrate into an oxidation reaction tank, adding persulfate and hydrogen peroxide into the oxidation reaction tank, and controlling the adding amount of the persulfate to be 0.12-1.2kg/m3The adding amount of hydrogen peroxide is 0.1-1L/m3Keeping stirring under the condition of the rotation speed of 150-3The reaction time is 0.25-2h, and oxidized effluent is obtained;
pumping the oxidized effluent into a pH adjusting tank, adjusting the pH value of the oxidized effluent to 6.0-7.0 by using alkali to obtain treated wastewater, and discharging the treated wastewater through a drainage pipeline.
2. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the addition amount of the flocculant is 100-200mg/L, the addition amount of the coagulant aid is 0.25-1mg/L, the flocculation settling time is 5-10min, and the mesh opening diameter is 100-400 meshes.
3. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the flocculating agent is polymeric ferric sulfate, and the coagulant aid is nonionic polyacrylamide.
4. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the adding amount of the persulfate is 0.12-0.6kg/m3The adding amount of the hydrogen peroxide is 0.1-0.6L/m3The rotating speed is 150r/min, and the ultraviolet light irradiation power is 5-10kW/m3The reaction time is 0.5-1 h.
5. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the ultraviolet lamp is an immersed ultraviolet germicidal lamp.
6. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the mass concentration of the hydrogen peroxide is 27.5%, and the persulfate is sodium persulfate or potassium persulfate.
7. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the wavelength of the ultraviolet light emitted by the ultraviolet lamp is 254 nm.
8. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: in the third step, the pH value is adjusted to 6.5-7.0.
9. The method for treating organic chemical wastewater according to claim 1, wherein the method comprises the following steps: the alkali is sodium hydroxide or potassium hydroxide.
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