CN111635030A - Advanced wastewater treatment process by flocculation precipitation method - Google Patents
Advanced wastewater treatment process by flocculation precipitation method Download PDFInfo
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- CN111635030A CN111635030A CN202010494767.XA CN202010494767A CN111635030A CN 111635030 A CN111635030 A CN 111635030A CN 202010494767 A CN202010494767 A CN 202010494767A CN 111635030 A CN111635030 A CN 111635030A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic 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
- C02F1/52—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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The invention discloses a wastewater advanced treatment process by a flocculation precipitation method, belonging to the field of sewage treatment. The invention comprises the following steps: filtering the wastewater by a grating and a twill filter screen in sequence; filling ozone into the wastewater, and fully stirring the wastewater; adding activated carbon into the wastewater, fully stirring the wastewater and filtering the wastewater; feeding the wastewater into a primary flocculation tank, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and finally performing solid-liquid separation to obtain a supernatant and a flocculation precipitate; sending the supernatant into a secondary flocculation tank, adding polyacrylamide into the secondary flocculation tank, and finally performing solid-liquid separation to obtain the supernatant and a flocculation precipitate; and (4) performing ultrafiltration on the supernatant and introducing the supernatant into a water collecting tank. The invention carries out deep treatment on the wastewater based on the flocculation precipitation method, can effectively improve the treatment effect on the wastewater, has the advantages of simple treatment operation, low cost, no byproduct generation and the like, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a wastewater advanced treatment process by a flocculation precipitation method.
Background
In recent years, with the frequent occurrence of various water pollution events and the improvement of sewage discharge standards, higher requirements are put forward for enterprises, and how to better utilize sewage resources, reduce sewage discharge and realize cyclic utilization becomes an important task for the enterprises.
The recycling of the industrial wastewater after advanced treatment is an important way for realizing water saving, emission reduction and water pollution control. The water quality of the industrial wastewater is relatively complex along with different components of the production process and the production mode. Most industrial wastewater has large quality and water quantity change and high salt content, and part of the industrial wastewater contains toxic and harmful substances, so the industrial wastewater is difficult to directly recycle or recycle after being treated conventionally.
The current technologies adopted in industrial wastewater treatment mainly include advanced oxidation, reverse osmosis, conventional biological treatment and the like, which achieve certain effects, but have certain problems. Most industrial wastewater has poor biochemical property after secondary treatment, if the industrial wastewater is directly treated by a biological method, the treatment effect is poor, and the removal rate of COD, Cr and other related indexes cannot reach the recycling standard; if a chemical method is directly adopted, the treatment cost is higher and the economic benefit is poorer. Therefore, it is desired to develop a wastewater advanced treatment process of the flocculation precipitation method in order to solve the above problems.
Disclosure of Invention
The invention aims to provide a wastewater advanced treatment process by a flocculation precipitation method, and solves the existing problems.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a wastewater advanced treatment process by a flocculation precipitation method, which comprises the following steps:
filtering the wastewater by a grid and a twill filter screen in sequence, and intercepting suspended matters in the wastewater by using grid holes of an inclined screen;
step two, filling ozone into the wastewater obtained in the step one, and fully stirring the wastewater; the ozone filling amount is 300mg/L, and the stirring time is 15-30 min; then, fully exposing the wastewater to the sun; exposing for 24-48 h;
step three, putting the wastewater obtained in the step two into active carbon, and fully stirring the wastewater; the input amount of the active carbon is 500g/L, and the stirring time is 15-30 min; then, sending the wastewater into a filter, and intercepting active carbon in the wastewater by using the filter;
step four, feeding the wastewater obtained in the step three into a primary flocculation tank, adjusting the pH value of the primary flocculation tank to 3-5, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and fully stirring the wastewater for 10-20 min; standing for 10-20min after stirring, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step five, sending the supernatant obtained in the step four into a secondary flocculation tank, adjusting the pH value of the secondary flocculation tank to 6-8, adding polyacrylamide into the secondary flocculation tank, and fully stirring the wastewater for 10-20 min; standing for 10-20min after stirring, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step six, performing ultrafiltration on the supernatant obtained in the step five, and introducing the supernatant into a water collecting tank; the water purified in the water collecting tank is detected by the water quality detector, and the water is recycled after being qualified.
Further, in the fourth step, the addition amount of the polymeric aluminum ferric silicate flocculant is 45-80 mg/L.
Further, in the fourth step, the polymeric aluminum ferric silicate flocculant is prepared from the following raw materials in parts by weight: 15-20 parts of sodium silicate, 4-8 parts of dilute sulfuric acid, 10-20 parts of aluminum chloride, 13-18 parts of ferric sulfate and 30-50 parts of distilled water.
Further, the preparation process of the polymeric aluminum ferric silicate flocculant comprises the following steps: firstly, adding a certain amount of sodium silicate into distilled water, and stirring and heating the solution; secondly, adding a certain amount of dilute sulfuric acid into the solution, and fully stirring; thirdly, adding a certain amount of aluminum chloride into the solution, and fully stirring; finally, adding a certain amount of ferric sulfate into the solution, and fully stirring; standing to prepare the polymeric aluminum ferric silicate flocculant.
Further, in the fifth step, the adding amount of the polyacrylamide is 50-85 mg/L.
The invention has the following beneficial effects:
the invention deeply treats the wastewater based on the flocculation precipitation method, can effectively improve the treatment effect of the wastewater, has the advantages of simple treatment operation, low cost, no byproduct generation and the like, can ensure that the final wastewater is stably discharged up to the standard, enables the final discharged water to be naturally linked with the surface water body, greatly improves the recycling rate of the wastewater, realizes the aims of energy conservation and emission reduction of enterprises, achieves the unification of environmental benefits and social benefits, and has higher market application value.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
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 wastewater advanced treatment process of a flocculation precipitation method of the 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.
The first embodiment is as follows:
as shown in figure 1, the advanced wastewater treatment process of the flocculation precipitation method comprises the following steps:
filtering the wastewater by a grid and a twill filter screen in sequence, and intercepting suspended matters in the wastewater by using grid holes of an inclined screen;
step two, filling ozone into the wastewater obtained in the step one, and fully stirring the wastewater; the ozone filling amount is 300mg/L, and the stirring time is 15 min; then, fully exposing the wastewater to the sun; exposing for 24 h;
step three, putting the wastewater obtained in the step two into active carbon, and fully stirring the wastewater; the adding amount of the active carbon is 500g/L, and the stirring time is 15 min; then, sending the wastewater into a filter, and intercepting active carbon in the wastewater by using the filter;
step four, feeding the wastewater obtained in the step three into a primary flocculation tank, adjusting the pH value of the primary flocculation tank to 3, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and fully stirring the wastewater for 10 min; standing for 10min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step five, sending the supernatant obtained in the step four into a secondary flocculation tank, adjusting the pH value of the secondary flocculation tank to 6, adding polyacrylamide into the secondary flocculation tank, and fully stirring the wastewater for 10 min; standing for 10min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step six, performing ultrafiltration on the supernatant obtained in the step five, and introducing the supernatant into a water collecting tank; the water purified in the water collecting tank is detected by the water quality detector, and the water is recycled after being qualified.
Wherein, in the fourth step, the addition amount of the polymeric aluminum ferric silicate flocculant is 45 mg/L.
In the fourth step, the polymeric aluminum ferric silicate flocculant comprises the following raw materials in parts by weight: 15 parts of sodium silicate, 4 parts of dilute sulfuric acid, 10 parts of aluminum chloride, 13 parts of ferric sulfate and 30 parts of distilled water.
The preparation process of the polymeric aluminum ferric silicate flocculant comprises the following steps: firstly, adding a certain amount of sodium silicate into distilled water, and stirring and heating the solution for 20min and 20 min; secondly, adding a certain amount of dilute sulfuric acid into the solution, and fully stirring for 15 min; thirdly, adding a certain amount of aluminum chloride into the solution, and fully stirring for 15 min; finally, adding a certain amount of ferric sulfate into the solution, and fully stirring for 30 min; standing for 45min to obtain the polymeric aluminum ferric silicate flocculant.
Further, in the fifth step, the amount of the polyacrylamide added is 50 mg/L.
The second embodiment is as follows:
as shown in figure 1, the advanced wastewater treatment process of the flocculation precipitation method comprises the following steps:
filtering the wastewater by a grid and a twill filter screen in sequence, and intercepting suspended matters in the wastewater by using grid holes of an inclined screen;
step two, filling ozone into the wastewater obtained in the step one, and fully stirring the wastewater; the ozone filling amount is 300mg/L, and the stirring time is 22.5 min; then, fully exposing the wastewater to the sun; exposing for 36 h;
step three, putting the wastewater obtained in the step two into active carbon, and fully stirring the wastewater; the adding amount of the activated carbon is 500g/L, and the stirring time is 22.5 min; then, sending the wastewater into a filter, and intercepting active carbon in the wastewater by using the filter;
step four, feeding the wastewater obtained in the step three into a primary flocculation tank, adjusting the pH value of the primary flocculation tank to 4, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and fully stirring the wastewater for 15 min; standing for 15min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step five, sending the supernatant obtained in the step four into a secondary flocculation tank, adjusting the pH value of the secondary flocculation tank to 7, adding polyacrylamide into the secondary flocculation tank, and fully stirring the wastewater for 15 min; standing for 15min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step six, performing ultrafiltration on the supernatant obtained in the step five, and introducing the supernatant into a water collecting tank; the water purified in the water collecting tank is detected by the water quality detector, and the water is recycled after being qualified.
Further, in the fourth step, the addition amount of the polymeric aluminum ferric silicate flocculant is 65 mg/L.
Further, in the fourth step, the polymeric aluminum ferric silicate flocculant is prepared from the following raw materials in parts by weight: 17 parts of sodium silicate, 6 parts of dilute sulfuric acid, 15 parts of aluminum chloride, 15 parts of ferric sulfate and 40 parts of distilled water.
Further, the preparation process of the polymeric aluminum ferric silicate flocculant comprises the following steps: firstly, adding a certain amount of sodium silicate into distilled water, and stirring and heating the solution for 30min and 30 min; secondly, adding a certain amount of dilute sulfuric acid into the solution, and fully stirring for 20 min; thirdly, adding a certain amount of aluminum chloride into the solution, and fully stirring for 20 min; finally, adding a certain amount of ferric sulfate into the solution, and fully stirring for 40 min; standing for 60min to obtain the polymeric aluminum ferric silicate flocculant.
Further, in the fifth step, the amount of polyacrylamide added is 70 mg/L.
The third concrete embodiment:
as shown in figure 1, the advanced wastewater treatment process of the flocculation precipitation method comprises the following steps:
filtering the wastewater by a grid and a twill filter screen in sequence, and intercepting suspended matters in the wastewater by using grid holes of an inclined screen;
step two, filling ozone into the wastewater obtained in the step one, and fully stirring the wastewater; the ozone filling amount is 300mg/L, and the stirring time is 30 min; then, fully exposing the wastewater to the sun; exposing for 48 h;
step three, putting the wastewater obtained in the step two into active carbon, and fully stirring the wastewater; the adding amount of the active carbon is 500g/L, and the stirring time is 30 min; then, sending the wastewater into a filter, and intercepting active carbon in the wastewater by using the filter;
step four, feeding the wastewater obtained in the step three into a primary flocculation tank, adjusting the pH value of the primary flocculation tank to 5, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and fully stirring the wastewater for 20 min; standing for 20min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step five, sending the supernatant obtained in the step four into a secondary flocculation tank, adjusting the pH value of the secondary flocculation tank to 8, adding polyacrylamide into the secondary flocculation tank, and fully stirring the wastewater for 20 min; standing for 20min after stirring is finished, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step six, performing ultrafiltration on the supernatant obtained in the step five, and introducing the supernatant into a water collecting tank; the water purified in the water collecting tank is detected by the water quality detector, and the water is recycled after being qualified.
Further, in the fourth step, the addition amount of the polymeric aluminum ferric silicate flocculant is 80 mg/L.
Further, in the fourth step, the polymeric aluminum ferric silicate flocculant is prepared from the following raw materials in parts by weight: 20 parts of sodium silicate, 8 parts of dilute sulfuric acid, 20 parts of aluminum chloride, 18 parts of ferric sulfate and 50 parts of distilled water.
Further, the preparation process of the polymeric aluminum ferric silicate flocculant comprises the following steps: firstly, adding a certain amount of sodium silicate into distilled water, and stirring and heating the solution for 30min and 30 min; secondly, adding a certain amount of dilute sulfuric acid into the solution, and fully stirring for 25 min; thirdly, adding a certain amount of aluminum chloride into the solution, and fully stirring for 25 min; finally, adding a certain amount of ferric sulfate into the solution, and fully stirring for 45 min; standing for 70min to obtain the polymeric aluminum ferric silicate flocculant.
Further, in the fifth step, the amount of polyacrylamide added was 85 mg/L.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A wastewater advanced treatment process of a flocculation precipitation method is characterized by comprising the following steps:
filtering the wastewater by a grid and a twill filter screen in sequence, and intercepting suspended matters in the wastewater by using grid holes of an inclined screen;
step two, filling ozone into the wastewater obtained in the step one, and fully stirring the wastewater; the ozone filling amount is 300mg/L, and the stirring time is 15-30 min; then, fully exposing the wastewater to the sun; exposing for 24-48 h;
step three, putting the wastewater obtained in the step two into active carbon, and fully stirring the wastewater; the input amount of the active carbon is 500g/L, and the stirring time is 15-30 min; then, sending the wastewater into a filter, and intercepting active carbon in the wastewater by using the filter;
step four, feeding the wastewater obtained in the step three into a primary flocculation tank, adjusting the pH value of the primary flocculation tank to 3-5, adding a polymeric aluminum ferric silicate flocculant into the primary flocculation tank, and fully stirring the wastewater for 10-20 min; standing for 10-20min after stirring, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step five, sending the supernatant obtained in the step four into a secondary flocculation tank, adjusting the pH value of the secondary flocculation tank to 6-8, adding polyacrylamide into the secondary flocculation tank, and fully stirring the wastewater for 10-20 min; standing for 10-20min after stirring, and finally performing solid-liquid separation to obtain supernatant and flocculated precipitate;
step six, performing ultrafiltration on the supernatant obtained in the step five, and introducing the supernatant into a water collecting tank; the water purified in the water collecting tank is detected by the water quality detector, and the water is recycled after being qualified.
2. The advanced wastewater treatment process through flocculation and precipitation of claim 1, wherein in the fourth step, the polymeric aluminum ferric silicate flocculant is added in an amount of 45-80 mg/L.
3. The advanced wastewater treatment process of a flocculation precipitation method according to claim 1 or 2, wherein in the fourth step, the polymeric aluminum ferric silicate flocculant comprises the following raw materials in parts by weight: 15-20 parts of sodium silicate, 4-8 parts of dilute sulfuric acid, 10-20 parts of aluminum chloride, 13-18 parts of ferric sulfate and 30-50 parts of distilled water.
4. The advanced wastewater treatment process of flocculation precipitation of claim 3, wherein the preparation process of the polymeric aluminum ferric silicate flocculant comprises: firstly, adding a certain amount of sodium silicate into distilled water, and stirring and heating the solution; secondly, adding a certain amount of dilute sulfuric acid into the solution, and fully stirring; thirdly, adding a certain amount of aluminum chloride into the solution, and fully stirring; finally, adding a certain amount of ferric sulfate into the solution, and fully stirring; standing to prepare the polymeric aluminum ferric silicate flocculant.
5. The advanced wastewater treatment process through flocculation and precipitation of claim 1, wherein in the fifth step, the amount of polyacrylamide added is 50-85 mg/L.
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| CN202010494767.XA CN111635030A (en) | 2020-06-03 | 2020-06-03 | Advanced wastewater treatment process by flocculation precipitation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353256A (en) * | 2022-08-22 | 2022-11-18 | 山东华城工程技术有限公司 | Water purification treatment process for micro-polluted surface water source water |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353256A (en) * | 2022-08-22 | 2022-11-18 | 山东华城工程技术有限公司 | Water purification treatment process for micro-polluted surface water source water |
| CN115353256B (en) * | 2022-08-22 | 2024-04-16 | 山东华城工程技术有限公司 | Water purification treatment process for micro-polluted surface water source water |
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