CN111252946A - Treatment process and treatment system for sewage containing COD - Google Patents
Treatment process and treatment system for sewage containing COD Download PDFInfo
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- CN111252946A CN111252946A CN202010116501.1A CN202010116501A CN111252946A CN 111252946 A CN111252946 A CN 111252946A CN 202010116501 A CN202010116501 A CN 202010116501A CN 111252946 A CN111252946 A CN 111252946A
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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
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention discloses a treatment process and a treatment system for sewage containing COD, wherein the process comprises the following steps: introducing sewage into an adjusting tank, adding a pH regulator, starting an aeration device and a stirring device, adjusting the pH to 4-6, introducing the sewage into a primary reaction tank, respectively adding a strong reducing agent and a strong oxidizing agent, standing for 3-10 min, and adding PAM; then, introducing the sewage into an inclined tube sedimentation tank to separate precipitates, introducing the precipitates into a sludge tank, introducing the upper-layer sewage into a secondary reaction tank, and adjusting the pH value to be neutral; sewage in the secondary reaction tank overflows into an air floatation tank, suspended matter particles are removed by an air floatation machine in the air floatation tank and are conveyed into a sludge tank, and the sewage at the lower layer is introduced into a sand filter tank and is discharged after sand filtration; the process is simple to operate, high in treatment efficiency, and capable of purifying sewage with the COD content of 120-200 mg/L to the COD content of below 50mg/L within half an hour, and the produced sludge is less; the processing system has low requirement on equipment and is easy to implement.
Description
Technical Field
The invention relates to the field of sewage treatment methods and equipment, in particular to a treatment process and a treatment system for sewage containing COD.
Background
COD (Chemical Oxygen Demand) is a Chemical method for measuring the amount of reducing substances to be oxidized in a water sample. COD in the wastewater comprises soluble COD and non-soluble COD (such as suspended COD), the wastewater generated in the production of air conditioning enterprises generally contains soluble COD with higher content, and the existing coagulating sedimentation method added with PAC (polyaluminium chloride) and PAM (polyacrylamide) can well treat suspended substances but cannot solve the soluble COD; the method generates more sludge and has high cost for treating the sludge; the biochemical treatment method has long treatment time, and is difficult to treat soluble COD to be suitable for the discharge standard of industrial circulating water in a short time.
The sewage treatment system of the existing chemical precipitation method has unreasonable arrangement among all the tank bodies, short reaction residence time of the medicament, insufficient chemical reaction, long distance between the medicament tank and the reaction tank, incapability of adding or stopping adding medicaments in time and poor controllability of the reaction.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a process and system for treating wastewater containing COD, which is directed to solving at least one of the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for treating sewage containing COD comprises the following steps:
s001, introducing the sewage into a primary reaction tank, respectively adding a strong reducing agent and a strong oxidizing agent, standing for 3-10 min, and adding PAM;
s002, introducing the treated sewage into an inclined tube sedimentation tank to separate precipitates, introducing the precipitates into a sludge tank, introducing the upper-layer sewage into a secondary reaction tank, and adjusting the pH value to be neutral;
and S003, overflowing the sewage in the secondary reaction tank into an air floatation tank, removing suspended particles by an air floatation machine in the air floatation tank, conveying the sewage into a sludge tank, introducing the sewage at the lower layer into a sand filter, and discharging the sewage after sand filtration.
In the treatment process of the sewage containing COD, before the step S001, the sewage is introduced into an adjusting tank, and the pH is adjusted to 4-6.
In the treatment process of the sewage containing COD, when the medicament is added into the regulating tank to regulate the pH value of the sewage, the aeration device and the aeration device are simultaneously started.
In the treatment process of the sewage containing COD, the strong reducing agent in the step S001 is ferrous sulfate, and the strong oxidant is hydrogen peroxide.
In the treatment process of the sewage containing COD, the primary reaction tank comprises a tank A, a tank B and a tank C, the bottoms of the tank A and the tank B are communicated, and the upper parts of the tank B and the tank C are communicated.
In the treatment process of the sewage containing COD, in the step S001, a strong reducing agent is added into the tank A, a strong oxidizing agent is added into the tank B, stirring and aeration are carried out, standing is carried out for 3-8 min, a pH regulator is added into the tank C to regulate the pH value to 6-9, and PAM is added.
In the treatment process of the sewage containing COD, the dosing points of the strong reducing agent and the strong oxidizing agent are arranged in a staggered mode.
In the treatment process of the sewage containing COD, the aeration device and the stirring device are simultaneously started when the pH regulator is added into the secondary reaction tank in the step S002.
A treatment system of sewage containing COD, which is applied to the treatment process of the sewage.
The system for treating the sewage containing COD comprises an adjusting tank, a primary reaction tank, an inclined tube sedimentation tank, a secondary reaction tank, an air flotation tank and a sand filter tank which are sequentially connected, and further comprises a sludge tank, a strong reducing agent storage tank, a strong oxidizing agent storage tank, a flocculating agent storage tank, a first pH regulator storage tank and a second pH regulator storage tank; the sludge tank is respectively communicated with the inclined tube sedimentation tank and the air flotation tank; the primary reaction tank comprises a tank A, a tank B and a tank C, the upper part of the regulating tank is communicated with the tank A, the bottom of the tank A is communicated with the tank B, the upper part of the tank B is communicated with the tank C, and the bottom of the tank C is communicated with the upper part of the inclined tube sedimentation tank; the first pH regulator storage tank is respectively connected with the regulating reservoir and the C tank through pipelines, the reducing agent storage tank is connected with the A tank through pipelines, the oxidizing agent storage tank is connected with the B tank through pipelines, and the second pH regulator storage tank is connected with the secondary reaction tank through pipelines.
Has the advantages that:
the invention provides a treatment process and a treatment system for sewage containing COD (chemical oxygen demand), wherein the process adds a strong oxidant and a strong reducing agent to carry out redox reaction on the strong oxidant and the strong reducing agent to generate an intermediate product with strong oxidative decomposition capability under an acidic condition, so that the soluble COD in the sewage is quickly decomposed, and the effect of quickly removing the COD is achieved; the process is short in time consumption, can purify sewage with the COD content of 120-200 mg/L within half an hour until the COD content is below 50mg/L, and meets the discharge standard of industrial recycling water; and the method produces less sludge, reduces the cost for treating the sludge and accords with the economic benefits of enterprises.
Drawings
FIG. 1 is a schematic structural view of the system for treating sewage containing COD provided by the present invention.
Detailed Description
The invention provides a treatment process and a treatment system for sewage containing COD, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
The invention provides a treatment process of sewage containing COD, which comprises the following steps:
introducing the sewage into an adjusting tank, adding a pH regulator, starting an aeration device and a stirring device, and adjusting the pH to 4-6; within the pH range, the strong reducing agent and the strong oxidizing agent have strong oxidative decomposition capacity and can rapidly decompose soluble COD substances in the wastewater.
Introducing the sewage into a primary reaction tank, respectively adding a strong reducing agent and a strong oxidizing agent, standing for 3-10 min, and adding PAM;
specifically, the primary reaction tank comprises a tank A, a tank B and a tank C, the bottoms of the tank A and the tank B are communicated, and the upper parts of the tank B and the tank C are communicated; through the dislocation connection mode between each cell body, can increase the dwell time of medicament in the waste water, guarantee that chemical reaction can fully go on.
More specifically, simultaneously adding a strong reducing agent into the tank A, adding a strong oxidizing agent into the tank B, stirring, aerating, standing for 3-8 min to ensure that the reaction is sufficient, overflowing sewage into the tank C, adding a pH regulator into the tank C to regulate the pH to 6-9, adding PAM, stirring, aerating to ensure that the PAM fully adsorbs suspended particles in the wastewater.
Furthermore, the dosing points of the strong reducing agent and the strong oxidizing agent are arranged in a staggered manner; the distance between the strong reducing agent and the strong oxidizing agent is lengthened, so that the strong reducing agent and the strong oxidizing agent can be fully dispersed in water to contact and react with each other, the uniformity of wastewater treatment is improved, and the treatment effect is improved.
In this embodiment, the strong reducing agent is ferrous sulfate, and the strong oxidant is hydrogen peroxide; the ferrous sulfate and hydrogen peroxide can generate oxidation-reduction reaction after contacting in sewage to generate intermediate products of OH free radicals and O2The free radicals and the two intermediate products have strong oxidative decomposition capability under the acidic condition, and can quickly decompose soluble COD substances in sewage, thereby achieving the effect of quickly purifying the soluble COD in the water.
Introducing the treated sewage into an inclined tube sedimentation tank to separate precipitates, introducing the precipitates into a sludge tank, and carrying out outward treatment after dehydration treatment; introducing the upper-layer sewage into a secondary reaction tank, starting an aeration device and a stirring device, and adding hydrochloric acid to adjust the pH of the sewage to be neutral so as to enable the sewage to meet the discharge standard of industrial circulating water;
then sewage in the secondary reaction tank overflows to the air flotation tank, an air flotation machine in the air flotation tank generates a large amount of micro bubbles in the sewage, air is attached to suspended particles in a highly dispersed micro bubble mode, the suspended particles are caused to be in a state that the density is smaller than that of water and float on the water surface, then substances floating on the water surface are scraped off through a scraper blade and conveyed to a sludge tank through a feeding pump, and the sewage on the lower layer is introduced into a sand filter and is discharged after sand filtration.
A treatment system of sewage containing COD, which is applied to the treatment process of the sewage.
Referring to fig. 1, the system for treating sewage containing COD comprises an adjusting tank 1, a primary reaction tank 2, an inclined tube sedimentation tank 3, a secondary reaction tank 4, an air flotation tank 5, a sand filter 6, a sludge tank 7, a strong reducing agent storage tank 8, a strong oxidant storage tank 9, a flocculant storage tank 10, a first pH adjuster storage tank 11, and a second pH adjuster storage tank 12, which are connected in sequence; in the embodiment, the device further comprises an online water quality monitoring device 13, wherein the online water quality monitoring device 13 is connected to a drainage pipeline at the downstream of the sand filter 6 and used for monitoring the quality of the treated discharged water and ensuring that the quality meets the national standard of industrial circulating water. The online water quality monitoring device 13 has a data storage function, and can record the water quality of the sewage discharged every day, so that technicians can conveniently check and monitor the water quality. Preferably, the online water quality monitoring device also has an alarm function, and if the discharged water quality does not meet the specification, an alarm is given to remind technicians to overhaul the whole treatment system. The sludge tank 7 is respectively communicated with the inclined tube sedimentation tank 3 and the air flotation tank 5; and conveying the sediments in the inclined tube sedimentation tank 3 and suspended matters on the surface of the air floatation tank 5 to a sludge tank 7 as sludge for treatment.
The primary reaction tank 2 comprises a tank A201, a tank B202 and a tank C203, the upper part of the adjusting tank 1 is communicated with the tank A201, the bottom of the tank A201 is communicated with the tank B202, the upper part of the tank B202 is communicated with the tank C203, and the bottom of the tank C203 is communicated with the upper part of the inclined tube sedimentation tank 3; the tank A, the tank B and the tank C are communicated in a staggered manner, so that the retention time of sewage among corresponding tank bodies is increased, the medicine is uniformly dispersed, and the reaction time is longer and more sufficient.
First pH regulator holding vessel 11 passes through the pipe connection with equalizing basin 1 and C groove 203 respectively, strong reductant holding vessel 8 passes through the pipe connection with A groove 201, strong oxidant holding vessel 9 passes through the pipe connection with B groove 202, second pH regulator holding vessel 12 passes through the pipe connection with secondary reaction tank 4. The medicament tanks are respectively arranged on one side of the corresponding connected tank bodies/tank bodies, and the distance between the medicament tanks and the corresponding connected tank bodies/tank bodies is shortened, so that the reaction time of adding medicaments and stopping adding medicaments is shortened, and the accuracy of controlling the amount of the added medicaments is improved.
In this embodiment, the adjusting tank 1, the primary reaction tank 2 and the secondary reaction tank 4 are all provided with an aeration device 14 and a stirring device 15, so that the added medicament is more uniformly distributed in the sewage, and the sewage treatment effect is improved. The aeration device 14 also increases the dissolved oxygen level in the water, increasing the dissolution of the soluble COD to some extent. The aeration device 14 and the stirring device 15 in the primary reaction tank 2 can also make the intermediate product generated after the reaction of the strong reducing agent and the strong oxidizing agent uniformly distributed in the water body, quickly decompose the soluble COD in the wastewater and accelerate the reaction rate.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A process for treating sewage containing COD is characterized by comprising the following steps:
s001, introducing the sewage into a primary reaction tank, respectively adding a strong reducing agent and a strong oxidizing agent, standing for 3-10 min, and adding PAM;
s002, introducing the treated sewage into an inclined tube sedimentation tank to separate precipitates, introducing the precipitates into a sludge tank, introducing the upper-layer sewage into a secondary reaction tank, and adjusting the pH value to be neutral;
and S003, overflowing the sewage in the secondary reaction tank into an air floatation tank, removing suspended particles by an air floatation machine in the air floatation tank, conveying the sewage into a sludge tank, introducing the sewage at the lower layer into a sand filter, and discharging the sewage after sand filtration.
2. The process of claim 1, further comprising adjusting the pH of the wastewater to 4-6 by introducing the wastewater into an adjusting tank before the step S001.
3. The process according to claim 2, wherein the aeration apparatus and the aeration apparatus are simultaneously started while the pH of the wastewater is adjusted by adding the chemical to the adjusting tank.
4. The process of treating sewage containing COD according to claim 1, wherein said strong reducing agent in step S001 is ferrous sulfate and said strong oxidizing agent is hydrogen peroxide.
5. The process according to claim 1, wherein the primary reaction tank comprises a tank A, a tank B and a tank C, the bottoms of the tank A and the tank B are communicated, and the upper parts of the tank B and the tank C are communicated.
6. The process of claim 5, wherein in step S001, the strong reducing agent is added into tank A, the strong oxidizing agent is added into tank B, the mixture is stirred, aerated and kept still for 3-8 min, the pH regulator is added into tank C to regulate the pH to 6-9, and PAM is added.
7. The process of claim 6, wherein the dosing points of the strong reducing agent and the strong oxidizing agent are staggered.
8. The process according to claim 1, wherein the aeration means and the stirring means are simultaneously started when the pH adjusting agent is added to the secondary reaction tank in the step S002.
9. A treatment system for sewage containing COD, characterized by being applied to the treatment process of sewage according to any one of claims 1 to 8.
10. The system for treating sewage containing COD according to claim 9, comprising an adjusting tank, a primary reaction tank, an inclined tube sedimentation tank, a secondary reaction tank, an air flotation tank and a sand filter tank which are connected in sequence, and further comprising a sludge tank, a strong reducing agent storage tank, a strong oxidizing agent storage tank, a flocculating agent storage tank, a first pH adjusting agent storage tank and a second pH adjusting agent storage tank; the sludge tank is respectively communicated with the inclined tube sedimentation tank and the air flotation tank; the primary reaction tank comprises a tank A, a tank B and a tank C, the upper part of the regulating tank is communicated with the tank A, the bottom of the tank A is communicated with the tank B, the upper part of the tank B is communicated with the tank C, and the bottom of the tank C is communicated with the upper part of the inclined tube sedimentation tank; the first pH regulator storage tank is respectively connected with the regulating reservoir and the C tank through pipelines, the reducing agent storage tank is connected with the A tank through pipelines, the oxidizing agent storage tank is connected with the B tank through pipelines, and the second pH regulator storage tank is connected with the secondary reaction tank through pipelines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010116501.1A CN111252946A (en) | 2020-02-25 | 2020-02-25 | Treatment process and treatment system for sewage containing COD |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010116501.1A CN111252946A (en) | 2020-02-25 | 2020-02-25 | Treatment process and treatment system for sewage containing COD |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104478176A (en) * | 2014-12-27 | 2015-04-01 | 温州泓呈祥科技有限公司 | Advanced treatment system for sewage discharged by meat processing enterprises |
| CN105217885A (en) * | 2015-09-22 | 2016-01-06 | 张家港市格锐环境工程有限公司 | A kind for the treatment of system of dyeing and printing auxiliary factory effluent and treatment process |
| CN207391162U (en) * | 2017-11-30 | 2018-05-22 | 江苏鑫诚嘉环保工程有限公司 | A kind of pneumatically supported underground water treating device containing high-efficiency dissolued-air |
| US20190084858A1 (en) * | 2016-03-22 | 2019-03-21 | Chinese Research Academy Of Environmental Sciences | Method for treating and recycling organic wastewater and apparatus |
| CN209537247U (en) * | 2019-01-28 | 2019-10-25 | 宜昌金兴新材料有限公司 | Laser printing waste water treatment system |
| CN209835897U (en) * | 2019-04-04 | 2019-12-24 | 河南省绿韵环保科技有限公司 | Novel slaughter wastewater treatment system |
-
2020
- 2020-02-25 CN CN202010116501.1A patent/CN111252946A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104478176A (en) * | 2014-12-27 | 2015-04-01 | 温州泓呈祥科技有限公司 | Advanced treatment system for sewage discharged by meat processing enterprises |
| CN105217885A (en) * | 2015-09-22 | 2016-01-06 | 张家港市格锐环境工程有限公司 | A kind for the treatment of system of dyeing and printing auxiliary factory effluent and treatment process |
| US20190084858A1 (en) * | 2016-03-22 | 2019-03-21 | Chinese Research Academy Of Environmental Sciences | Method for treating and recycling organic wastewater and apparatus |
| CN207391162U (en) * | 2017-11-30 | 2018-05-22 | 江苏鑫诚嘉环保工程有限公司 | A kind of pneumatically supported underground water treating device containing high-efficiency dissolued-air |
| CN209537247U (en) * | 2019-01-28 | 2019-10-25 | 宜昌金兴新材料有限公司 | Laser printing waste water treatment system |
| CN209835897U (en) * | 2019-04-04 | 2019-12-24 | 河南省绿韵环保科技有限公司 | Novel slaughter wastewater treatment system |
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Application publication date: 20200609 |