CN111732249A - Pretreatment process of integrated Fenton equipment integrated system - Google Patents
Pretreatment process of integrated Fenton equipment integrated system Download PDFInfo
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- CN111732249A CN111732249A CN202010668796.3A CN202010668796A CN111732249A CN 111732249 A CN111732249 A CN 111732249A CN 202010668796 A CN202010668796 A CN 202010668796A CN 111732249 A CN111732249 A CN 111732249A
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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
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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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
- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses a pretreatment process of an integrated Fenton equipment integration system, which comprises the following steps: s1, connecting the original wastewater into a regulating tank to homogenize the quality of the wastewater; s2, pumping the wastewater into a pH adjusting tank, wherein sulfuric acid can be added into the pH adjusting tank to make the pH value in the pH adjusting tank acidic; s3, pumping the process wastewater in the pH adjusting tank into an oxidation tank A, and adding an oxidant; s4, pumping the effluent of the oxidation pond A into an oxidation pond B, and adding hydrogen peroxide to carry out a high-grade Fenton oxidation reaction; s5, adding caustic soda liquid into the wastewater subjected to the high-grade Fenton oxidation reaction to adjust the pH value to be neutral, and then adding polyacrylamide to perform coagulation reaction; s6, discharging the effluent after the coagulation reaction treatment into a sedimentation tank for mud-water separation, enabling the settled effluent to enter a clean water tank, and pumping the generated sludge into a sludge concentration tank; and (8) overflowing the effluent of the S7 sedimentation tank to a subsequent wastewater treatment process. The process has the advantages of strong oxidation capacity, high treatment efficiency, low operation cost and great shortening of the construction period.
Description
Technical Field
The invention relates to the technical field of sewage treatment processes, in particular to a pretreatment process of an integrated Fenton equipment integrated system.
Background
The data of the national statistical bureau show that 180 hundred million tons of industrial wastewater discharged in 2017 accounts for 26.0 percent of the total discharged water, and because municipal sewage pollutants are single, the technology is relatively simple, the industrial wastewater has more component types, and the water quality difference discharged by different manufacturers of the same product is large, the industrial wastewater treatment investment is large, the operation cost is high, the management is complex, and the technical difficulty is large; and the effluent does not reach the standard due to poor later management, and the expected effect cannot be realized.
A public centralized sewage treatment plant is generally built in an industrial park, and wastewater of each plant can enter the sewage treatment plant only after being treated to a certain degree; the consequence of this is that the pollutant which is easy to treat is treated by the factory, and most of the pollutant which is difficult to treat is treated by the factory, which finally results in that the operation load of the sewage treatment factory is very high, and the reduction of the pollutant can not be realized.
Industrial wastewater often contains complex chemical components, and particularly contains phenols, polycyclic aromatic hydrocarbons, chlorobenzene, nitrobenzene and other high-toxicity refractory organic pollutants in industrial wastewater such as printing and dyeing wastewater, dye wastewater, chemical wastewater, medical wastewater, coking wastewater and the like, so that the industrial wastewater is a main emission source of environmental pollution, and the standard emission of refractory organic matters in the industrial wastewater is important for environmental protection.
Refractory organics are organics where the microorganism cannot degrade at a sufficiently fast rate under any conditions; the reason why the organic matter is difficult to biodegrade is that, in addition to the fact that the external environmental conditions (such as temperature, pH, etc.) at the time of treatment do not reach the optimum conditions for biological treatment, there are two important reasons, namely that the chemical composition and structure of the compound itself, and in the microbial community, there are no enzymes directed to the compound to be treated, so that it is resistant to degradation; secondly, the wastewater contains substances (organic matters or inorganic matters) which are toxic to microorganisms or can inhibit the growth of the microorganisms, so that the organic matters cannot be rapidly degraded.
In view of the above, it is important to provide a new pretreatment process at the front end of the centralized treatment of industrial wastewater to remove the refractory organic pollutants by a physical or biochemical treatment process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pretreatment process of an integrated Fenton equipment integrated system, so as to solve the technical problem of high difficulty in industrial wastewater treatment in the prior art.
In order to achieve the aim, the invention provides a pretreatment process of an integrated Fenton equipment integrated system, which comprises a regulating tank, a pH regulating tank, an oxidation tank A, an oxidation tank B, a sedimentation tank and a clean water tank which are sequentially communicated through pipelines; the sedimentation tank is communicated with a sludge concentration tank of a wastewater station;
s1: raw wastewater is connected into a regulating tank to homogenize the quality of the wastewater;
s2: pumping the wastewater into a pH adjusting tank, wherein sulfuric acid can be added into the pH adjusting tank to make the pH value in the pH adjusting tank acidic;
s3: pumping the process wastewater in the pH adjusting tank into an oxidation tank A, and adding an oxidant into the oxidation tank A;
s4: pumping the effluent of the oxidation pond A into an oxidation pond B, and adding hydrogen peroxide into the oxidation pond B to perform a high-grade Fenton oxidation reaction;
s5: adding liquid caustic soda into the wastewater subjected to the high-grade Fenton oxidation reaction to adjust the pH value to be neutral, and then adding polyacrylamide to perform a coagulation reaction;
s6: discharging the effluent subjected to the coagulation reaction into a sedimentation tank for sludge-water separation, allowing the settled effluent to enter a clean water tank, and pumping the generated sludge into a sludge concentration tank;
s7: and overflowing the effluent of the sedimentation tank to a subsequent wastewater treatment process.
Further, the adjusting tank in the step S1 is provided with an aeration stirring device.
Further, the pH value of the pH adjusting tank adjusted in the step S2 is not less than 3.5 and not more than 4.
Further, the amount of ferrous sulfate added in step S3 is 0.5kg/m3Waste water 1kg/m3And (4) waste water.
Further, in the step S5, liquid caustic soda is added in the coagulation reaction process to adjust the pH value to be less than or equal to 7.0 and more than or equal to 6.5, and the addition amount of the polyacrylamide is 0.005kg/m3Waste water of 0.01kg/m3And (4) waste water.
Further, the overflow water after the reaction in the step S6 enters the clean water tank can be connected to a subsequent wastewater treatment process for continuous treatment.
Further, after mud-water separation in the step S6, the sludge is discharged to a sludge tank of a wastewater station for centralized treatment.
Compared with the prior art, the invention has the following beneficial effects: according to the pretreatment process of the integrated Fenton equipment integrated system, the Fenton reaction principle is adopted, the industrial sewage is subjected to front-end treatment, and the problem that part of characteristic organic pollutants in the chemical wastewater are difficult to degrade is effectively solved. The invention can reduce the COD in the chemical wastewater from 30000mg/L to 20000mg/L or below, and the whole process engineering is characterized by equipment and modular combination, simple operation and management, stable operation and the like, and the system has strong oxidation capability, high treatment efficiency and low operation cost, and greatly shortens the construction period.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention has no special limitation on the type or source of the salt-containing organic chemical wastewater to be treated, and any chemical wastewater to be treated can be used; in the embodiment of the invention, the Chemical Oxygen Demand (COD) of the chemical wastewater is less than or equal to 30000mg/L, and the electrical conductivity is less than or equal to 40000 mu s/cm.
In the invention, the salt-containing organic chemical wastewater preferably further comprises a mechanical filtration step before water quality adjustment, and the specific mode of the mechanical filtration is not particularly limited, and the mechanical filtration step is conventional in the field.
Referring to fig. 1, a preferred embodiment of the present invention provides a pretreatment process of an integrated fenton device integrated system, including: comprises an adjusting tank, a pH adjusting tank, an oxidation tank A, an oxidation tank B, a sedimentation tank and a clean water tank which are sequentially communicated through a pipeline; the sedimentation tank is communicated with a sludge concentration tank of a wastewater station;
s1: raw wastewater is connected into a regulating tank to homogenize the quality of the wastewater;
s2: pumping the wastewater into a pH adjusting tank, wherein sulfuric acid can be added into the pH adjusting tank to make the pH value in the pH adjusting tank acidic, and the pH value after the adjustment of the pH adjusting tank is more than or equal to 3.5 and less than or equal to 4;
s3: pumping the process wastewater in the pH adjusting tank into an oxidation tank A, and adding ferrous sulfate (or hydrogen peroxide) into the oxidation tank A; the addition amount of the hydrogen peroxide is preferably 0.5-1 kg/m3The addition amount of the waste water and the ferrous sulfate is preferably 0.5-1 kg/m3Waste water; the Fenton reaction is carried out in the oxidation pond A and the oxidation pond B, so that most of organic matters in the wastewater can be oxidized.
S4: pumping the effluent of the oxidation pond A into an oxidation pond B, and adding hydrogen peroxide into the oxidation pond B to perform a high-grade Fenton oxidation reaction; by Fe2+The excitation and reaction transfer function of (2) enables the chain reaction to be continuously carried out, and further enables H to be continuously carried out2O2Can continuously release hydroxyl free radical (. OH) until H2O2Is exhausted. Hydroxyl free radical (. OH) captures organic pollutant molecules in a reaction system to take hydrogen, plays roles of chain scission and decomposition, and degrades macromolecular organic matters into micromolecular organic matters or mineralizes the macromolecular organic matters into CO2And H2Inorganic substances such as O, etc., thereby improving the biodegradability of the wastewater and reducing the COD of the wastewaterCr。
S5: adding liquid caustic soda into the wastewater subjected to the high-grade Fenton oxidation reaction to adjust the pH value to be less than or equal to 6.5 and less than or equal to 7.0, and adding Polyacrylamide (PAM) to perform a coagulation reaction, wherein the addition amount of the PAM is 0.005kg/m3 wastewater-0.01 kg/m3 wastewater; and (3) obtaining oxidized wastewater, sequentially carrying out aeration and iron mud removal coagulation reaction on the oxidized wastewater, then carrying out mud-water separation, and collecting sludge and overflow liquid. In the invention, the aeration intensity of the oxidation pond B is preferably 5-10 m3/(m2H), more preferably 7 to 8m3/(m2H); the time of aeration is preferably 2-3 hr; in the invention, the aeration is used for removing the excess hydrogen peroxide remained in the previous step. In the inventionAdding lime and PAM in the iron mud coagulation reaction process; the addition amount of the lime is preferably 1-3 kg/m3Waste water, more preferably 2kg/m3Waste water; the preferable addition amount of the PAM is 0.005-0.01 kg/m3Waste water; more preferably 0.006 to 0.009kg/m3Waste water; the pH value is preferably adjusted to 6.5-7.5 in the iron mud coagulation reaction process, and lime is ionized into Ca in the iron mud coagulation reaction process2+Under the condition that the pH value is 6.5-7.0, reacting with F in the wastewater-、Cl-Rapid association to form CaF2、Ca Cl2Precipitation, effective removal of F-、Cl-。
S6: discharging the effluent subjected to the coagulation reaction into a sedimentation tank for sludge-water separation, allowing the settled effluent to enter a clean water tank, and pumping the generated sludge into a sludge concentration tank; carrying out sludge-water separation after the coagulation reaction of the iron sludge is removed, wherein the sludge-water separation is preferably carried out in a sedimentation tank, the sludge generated by the sludge-water separation is preferably pumped into a sludge tank for centralized treatment, and the sludge mainly comprises lime, calcium fluoride, calcium chloride, impurities and the like; the sludge pump is preferably a sludge screw pump.
S7: and the effluent of the sedimentation tank overflows to a subsequent wastewater treatment process, and overflow liquid generated by mud-water separation enters a clean water tank and is connected to the subsequent treatment process.
Preferably, the adjusting tank in the step S1 is provided with an aeration stirring device, and the type of the aeration stirring device is not limited, and the aeration stirring device is conventional in the art.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the invention can reduce COD in the chemical wastewater from 30000mg/L to 20000mg/L or less, and simultaneously reduce the fluorine content in the wastewater from 5000mg/L to 20mg/L or less; and the whole process has the advantages of good treatment effect, low power consumption, low running cost, simple operation management and stable running.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. The pretreatment process of the integrated Fenton equipment integrated system is characterized by comprising a regulating tank, a pH regulating tank, an oxidation tank A, an oxidation tank B, a sedimentation tank and a clean water tank which are sequentially communicated through pipelines; the sedimentation tank is communicated with a sludge concentration tank of a wastewater station;
s1: raw wastewater is connected into a regulating tank to homogenize the quality of the wastewater;
s2: pumping the wastewater into a pH adjusting tank, wherein sulfuric acid can be added into the pH adjusting tank to make the pH value in the pH adjusting tank acidic;
s3: pumping the process wastewater in the pH adjusting tank into an oxidation tank A, and adding an oxidant into the oxidation tank A;
s4: pumping the effluent of the oxidation pond A into an oxidation pond B, and adding hydrogen peroxide into the oxidation pond B to perform a high-grade Fenton oxidation reaction;
s5: adding liquid caustic soda into the wastewater subjected to the high-grade Fenton oxidation reaction to adjust the pH value to be neutral, and then adding polyacrylamide to perform a coagulation reaction;
s6: discharging the effluent subjected to the coagulation reaction into a sedimentation tank for sludge-water separation, allowing the settled effluent to enter a clean water tank, and pumping the generated sludge into a sludge concentration tank;
s7: and overflowing the effluent of the sedimentation tank to a subsequent wastewater treatment process.
2. The integrated Fenton equipment integrated system pretreatment process according to claim 1, wherein the Fenton equipment integrated system pretreatment process comprises the following steps: and the adjusting tank in the step S1 is provided with an aeration stirring device.
3. The integrated Fenton equipment integrated system pretreatment process according to claim 1, wherein the Fenton equipment integrated system pretreatment process comprises the following steps: the pH value of the pH adjusting tank in the step S2 is adjusted to be more than or equal to 3.5 and less than or equal to 4.
4. According to the rightThe integrated Fenton equipment integrated system pretreatment process of claim 1, characterized in that: the amount of the oxidizing agent added in step S3 was 0.5kg/m3Waste water 1kg/m3And (4) waste water.
5. The integrated Fenton equipment integrated system pretreatment process according to claim 1, wherein the Fenton equipment integrated system pretreatment process comprises the following steps: adding liquid caustic soda in the coagulation reaction process in the step S5 to adjust the pH value to be more than or equal to 6.5 and less than or equal to 7.0, wherein the addition amount of the polyacrylamide is 0.005kg/m3Waste water of 0.01kg/m3And (4) waste water.
6. The integrated Fenton equipment integrated system pretreatment process according to claim 1, wherein the Fenton equipment integrated system pretreatment process comprises the following steps: and step S6, after the reaction overflow water enters the clean water tank, the subsequent wastewater treatment process can be switched on for continuous treatment.
7. The integrated Fenton equipment integrated system pretreatment process according to claim 1, wherein the Fenton equipment integrated system pretreatment process comprises the following steps: and in the step S6, after mud-water separation, the sludge is discharged into a sludge pool of a wastewater station for centralized treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010668796.3A CN111732249A (en) | 2020-07-13 | 2020-07-13 | Pretreatment process of integrated Fenton equipment integrated system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772836A (en) * | 2022-04-28 | 2022-07-22 | 青岛海纳能源环保科技开发有限公司 | Method for treating waste emulsion |
| CN114853205A (en) * | 2022-04-11 | 2022-08-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Harmless treatment method for dilute sulfuric acid generated in acid preparation process by coking sulfur foam |
| CN115448508A (en) * | 2022-09-21 | 2022-12-09 | 扬州大学 | Device and method for treating chloroacetic acid production wastewater through ultrasonic-assisted Fenton-coagulating sedimentation |
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| CN103848513A (en) * | 2012-11-28 | 2014-06-11 | 苏州市环境保护有限公司 | Fluorine-containing wastewater treatment method based on Fenton oxidation reaction, and apparatus thereof |
| CN110642418A (en) * | 2019-09-20 | 2020-01-03 | 大连崇达电路有限公司 | Method for treating high organic wastewater generated in PCB production by Fenton process |
| CN111018187A (en) * | 2019-12-25 | 2020-04-17 | 苏州希图环保科技有限公司 | Wastewater treatment process based on Fenton oxidation reaction |
-
2020
- 2020-07-13 CN CN202010668796.3A patent/CN111732249A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848513A (en) * | 2012-11-28 | 2014-06-11 | 苏州市环境保护有限公司 | Fluorine-containing wastewater treatment method based on Fenton oxidation reaction, and apparatus thereof |
| CN110642418A (en) * | 2019-09-20 | 2020-01-03 | 大连崇达电路有限公司 | Method for treating high organic wastewater generated in PCB production by Fenton process |
| CN111018187A (en) * | 2019-12-25 | 2020-04-17 | 苏州希图环保科技有限公司 | Wastewater treatment process based on Fenton oxidation reaction |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114853205A (en) * | 2022-04-11 | 2022-08-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Harmless treatment method for dilute sulfuric acid generated in acid preparation process by coking sulfur foam |
| CN114853205B (en) * | 2022-04-11 | 2024-02-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Harmless treatment method for dilute sulfuric acid generated in coking sulfur foam acid production process |
| CN114772836A (en) * | 2022-04-28 | 2022-07-22 | 青岛海纳能源环保科技开发有限公司 | Method for treating waste emulsion |
| CN114772836B (en) * | 2022-04-28 | 2024-02-27 | 青岛海纳能源环保科技开发有限公司 | Treatment method of waste emulsion |
| CN115448508A (en) * | 2022-09-21 | 2022-12-09 | 扬州大学 | Device and method for treating chloroacetic acid production wastewater through ultrasonic-assisted Fenton-coagulating sedimentation |
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Application publication date: 20201002 |