CN111892238B - Black and odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method - Google Patents

Black and odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method Download PDF

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CN111892238B
CN111892238B CN202010662414.6A CN202010662414A CN111892238B CN 111892238 B CN111892238 B CN 111892238B CN 202010662414 A CN202010662414 A CN 202010662414A CN 111892238 B CN111892238 B CN 111892238B
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black
forward osmosis
concentration
stage
water
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CN111892238A (en
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张勇
何佳颖
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Nanjing Normal University
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Nanjing Normal University
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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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/203—Iron or iron compound
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/206—Manganese or manganese compounds
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses a black odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method, wherein black odorous water is subjected to three-stage concentration treatment by step forward osmosis, and the step concentration ensures that the single-stage flux is low, the membrane pollution degree is light, and the continuous operation can be realized; the drawing liquid diluted in the forward osmosis process is subjected to re-concentration and recycling by adopting reverse osmosis, so that secondary pollution can be avoided; the concentrated black and odorous water volume is greatly reduced, the concentrations of organic matters, iron, manganese and the like are obviously improved, the treatment capacity is effectively reduced, and the efficiency is improved; iron, manganese, suspended matters and colloidal substances in water are removed through coagulating sedimentation in sequence, anoxic hydrolysis is performed to improve biodegradability of concentrated water, and effluent finally enters a sewage plant, so that the defect that pollutants stay in a water body in conventional methods such as aeration, in-situ coagulant adding and the like is overcome.

Description

Black and odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a black odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method.
Background
Due to the discharge of industrial wastewater and domestic sewage, the ecological systems of surface water bodies such as urban rivers, lakes and the like face a great challenge, and black and odorous water has become a common problem in many cities in China. The formation mechanism of the black and odorous water body is that when the water body suffers from serious organic pollution, the aerobic decomposition of organic matters leads the oxygen consumption rate in the water body to be larger than the reoxygenation rate, so that the water body is anoxic, the organic matters are not completely degraded and are slowed down, odorous substances such as hydrogen sulfide, amine, ammonia, mercaptan and the like are generated in the anaerobic biodegradation process, and black substances such as FeS, MnS and the like are formed at the same time, so that the water body is black and odorous.
The current treatment methods for black smelly water comprise a physical method, a chemical method, a biological method and the like. The physical method comprises water conservancy projects such as water diversion, dredging and the like, mechanical algae removal, water diversion dilution and the like, and has the main problems of temporary solution, permanent solution and incapability of fundamentally solving the problem of black and odor; the chemical method comprises the steps of adding a chemical reagent to remove algae, adding ferric salt to remove phosphorus and the like, but the chemical reagent dosage is large, and the cost is higher; the biological method is widely applied, and the in-situ ecological restoration technology of the polluted river comprises aeration oxygenation, microbial restoration, protozoan restoration, phytoremediation, artificial wetland restoration and the like, and is economical and practical, but the effect is slow, and the plants are obviously influenced by seasonality. The patent 201611166004.2 discloses "black smelly water A/O forward osmosis treatment system and treatment process" applies forward osmosis technology to black smelly water, but its pioneer pretreatment technology includes ozone oxidation, air stripping, hydrolytic acidification, aerobic biological fluidized bed and other combined technologies, the process is complex, and black smelly water has lower organic load than sewage, and is difficult to directly adopt biochemical engineering treatment. How to fully exert the advantages of the forward osmosis technology plays an important role in reasonably applying the forward osmosis technology to the treatment of black odorous water.
Disclosure of Invention
The invention provides a combined emergency treatment method of black and odorous water forward osmosis-coagulation-anoxic hydrolysis, aiming at the problems of large investment, slow effect taking, easy radical treatment and the like of the current black and odorous water treatment, and aims to realize the aims of rapidness, stability and long-acting of the emergency treatment of the black and odorous water.
In order to achieve the purpose, the invention provides the following technical scheme:
a black smelly water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method comprises the following steps:
1) the black odorous water is subjected to three-stage concentration treatment through stepped forward osmosis, the three-stage drawn liquid is sent to the second-stage forward osmosis for continuous drawing operation after being subjected to osmotic dilution, and is finally sent to the first-stage forward osmosis for black odorous water concentration, and the first-stage diluted drawn liquid is sent to the reverse osmosis unit for concentration and then returns to the third-stage forward osmosis system for recycling;
2) the black and odorous water concentrated solution enters a coagulating sedimentation treatment device to remove iron, manganese, suspended matters and colloidal substances in water;
3) and the black and odorous water concentrated solution is sent into a biomembrane anoxic tank for anoxic hydrolysis, so that the biodegradability of the concentrated water is improved, the organic load is reduced, and the effluent is finally discharged into a municipal sewage pipe network and sent to a sewage plant for centralized treatment.
Further, in the step 1), the first-stage forward osmosis concentration multiple and the second-stage forward osmosis concentration multiple are both 2 times, the third-stage forward osmosis concentration multiple is 3 times, the volume of the black smelly water is reduced by 12 times after gradient concentration, the concentration of main pollutants is improved by about 10 times, and the next step of efficient treatment is facilitated.
Further, in the step 1), the forward osmosis drawing liquid adopts inorganic salt system drawing liquid, and the initial concentration of the third-level drawing liquid is 2M, so that the concentration of the drawing liquid entering the first-level forward osmosis system can be ensured to reach 0.5M, and the black and odorous water can still be concentrated well.
Further, in the step 1), the primary diluted draw solution is sent to a reverse osmosis unit to be concentrated to 2M and then returns to the three-stage forward osmosis system.
Further, in the step 2), PAC is used as a coagulant, and the air stirring and mixing mode is adopted in the mixing reaction stage to promote Fe 2+ 、Mn 2+ Oxidation and precipitation.
Further, in the step 3), the suspension filler is filled in the anoxic tank, and after film hanging, anoxic hydrolysis is performed on the black ozone concentrated solution by using an anoxic biomembrane, wherein the hydraulic retention time of the anoxic tank is 2-4 hours.
The invention has the following positive effects:
the method is a physicochemical-biochemical combined emergency treatment method for black smelly water, and has the advantages that: the black smelly water is greatly concentrated and subjected to volume reduction and then is subjected to subsequent treatment, so that the treatment capacity can be effectively reduced, and the efficiency can be improved; the gradient concentration mode is adopted, the single-stage flux is low, the membrane pollution degree is light, the flux is kept at a stable level after multiple cycles, and the continuous operation can be realized; the absorption liquid is circularly diluted and concentrated through forward osmosis and reverse osmosis, so that secondary pollution is avoided; after the black smelly water is concentrated, Fe, Mn and other black factors are removed by coagulation, and organic pollutants are subjected to anoxic hydrolysis and finally enter a sewage plant, so that the defect that the pollutants still stay in the water body in the conventional methods such as aeration, in-situ coagulant adding and the like is overcome.
Drawings
FIG. 1 is a flow chart of the combined emergency treatment method of black odorous water forward osmosis-coagulation-anoxic hydrolysis.
Fig. 2 is the change rule of the third stage forward osmosis flux of black odorous water according to the period in example 1.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications or substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and scope of the invention.
With reference to fig. 1, the combined emergency treatment method of black odorous water forward osmosis-coagulation-anoxic hydrolysis of the invention comprises the following steps:
black smelly water at first carries out tertiary concentrated processing through the step forward osmosis, one-level, the second grade forward osmosis concentration multiple all adopts 2 times, the tertiary forward osmosis concentration multiple adopts 3 times, the solution is drawn in the forward osmosis adopts inorganic salt system to draw the liquid, tertiary draw liquid initial concentration is 2M, the tertiary draw liquid is sent into the second grade forward osmosis and is continued to draw the operation after the dilution of permeating, send into the one-level at last and just permeate and carry out black smelly water concentration, the concentration is 0.5M when drawing the liquid and getting into the one-level forward osmosis system, still have good concentration effect to black smelly water. The volume of the black smelly water is reduced by 12 times after the gradient concentration, and the concentration of main pollutants is improved by about 10 times. And the first-stage diluted draw solution is sent into a reverse osmosis unit to be concentrated to 2M and then returns to the third-stage forward osmosis system.
The black and odorous water concentrated solution enters a coagulating sedimentation treatment device, PAC is taken as a coagulant, and iron, manganese, suspended matters and colloidal substances in water are removed in a mode of air stirring and mixing in a mixing reaction stage; and feeding the black and odorous water concentrated solution into a biomembrane anoxic tank, filling suspended fillers into the anoxic tank, performing anoxic hydrolysis on the black and odorous water concentrated solution by using an anoxic biomembrane after film hanging, wherein the hydraulic retention time of the anoxic tank is 2-4 hours, the biodegradability of the concentrated water subjected to anoxic hydrolysis is improved, the organic load is reduced, and the effluent is finally discharged into a municipal sewage pipe network and sent to a sewage plant for centralized treatment.
Example 1
During the test, a certain black and odorous water body in Nanjing of Jiangsu province is taken as a treatment object, the black and odorous water is firstly subjected to three-stage concentration treatment through stepped Forward Osmosis (FO), the COD (chemical oxygen demand) concentration of inlet water is within the range of 50.4-60mg/L, and NH (ammonia-to-nitrogen) is adopted 4 + N (ammoniacal nitrogen) is 2.0-4.2mg/L, and TP (total phosphorus, a contaminant commonly measured in sewage) is 0.26-0.29 mg/L. The first-stage and second-stage forward osmosis concentration times are 2 times, the third-stage forward osmosis concentration time is 3 times, and the forward osmosis drawing solution is sodium chloride solution (sodium chloride production place: chemical reagents of national drug group, Inc.)) And the initial concentration of the third-level drawing liquid is 2M, the third-level drawing liquid is sent to the second-level forward osmosis unit for continuous drawing operation after being subjected to osmotic dilution, and the first-level diluted drawing liquid is sent to the reverse osmosis unit for concentration to 2M and then returns to the third-level forward osmosis system. After the concentration of the three-stage FO, the COD concentration range of the black odorous water is increased to 480-550mg/L, and the biodegradability of the wastewater is low (the B/C ratio is in the range of 0.22-0.28).
The black odorous water concentrated solution enters a coagulating sedimentation treatment device, PAC (polyaluminium chloride) is used as a coagulant in the embodiment, and an air stirring and mixing mode is adopted in a mixing reaction stage to remove iron, manganese, suspended matters and colloidal substances in water.
And feeding the black and odorous water concentrated solution into a biomembrane anoxic tank, filling spherical suspended filler (phi 100mm, production place: Yixing Sedum environmental protection science and technology Limited company) into the anoxic tank, and performing anoxic hydrolysis on the black and odorous water concentrated solution by using an anoxic biomembrane after film hanging, wherein the hydraulic retention time of the anoxic tank is 2-4 hours.
After the black ozone concentrated solution is subjected to coagulating sedimentation-anoxic hydrolysis, COD is reduced to 390-.
Flux monitoring of the forward osmosis process of this example shows that the forward osmosis black odorous water membrane is lightly contaminated, and each concentration cycle only adopts a simple physical cleaning method, and as can be seen from fig. 2, the flux of the new membrane is highest in the first operation cycle, and is reduced to a certain extent from the second cycle, but can be kept at a more stable level as the operation time is prolonged.

Claims (3)

1. A black smelly water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method is characterized by comprising the following steps:
1) the black and odorous water is subjected to three-stage concentration treatment by gradient forward osmosis, wherein the forward osmosis drawing liquid is inorganic salt system drawing liquid, the initial concentration of the three-stage drawing liquid is 2M, the three-stage drawing liquid is subjected to permeation dilution and then sent to the second-stage forward osmosis for continuous drawing operation, and finally sent to the first-stage forward osmosis for black and odorous water concentration, the first-stage diluted drawing liquid is sent to the reverse osmosis unit for concentration and then returned to the three-stage forward osmosis system for recycling, and the first-stage diluted drawing liquid is sent to the reverse osmosis unit for concentration to 2M; 2 times of primary and secondary forward osmosis concentration times, 3 times of tertiary forward osmosis concentration times, and 12 times of volume reduction of black odorous water after gradient concentration;
2) the black and odorous water concentrated solution enters a coagulating sedimentation treatment device to remove iron, manganese, suspended matters and colloidal substances in water;
3) and the black and odorous water concentrated solution is sent into a biomembrane anoxic tank for anoxic hydrolysis, so that the biodegradability of the concentrated water is improved, the organic load is reduced, and the effluent is finally discharged into a municipal sewage pipe network and sent to a sewage plant for centralized treatment.
2. The combined emergency treatment method of black odorous water forward osmosis-coagulation-anoxic hydrolysis according to claim 1, wherein in the step 2), PAC is used as coagulant, and air stirring and mixing are adopted in the mixing reaction stage to promote Fe 2+ 、Mn 2+ Oxidation and precipitation.
3. The combined emergency treatment method of black odorous water forward osmosis-coagulation-anoxic hydrolysis according to claim 1, wherein in the step 3), suspended fillers are filled in the anoxic tank, and the hydraulic retention time of the anoxic tank is 2-4 hours.
CN202010662414.6A 2020-07-10 2020-07-10 Black and odorous water forward osmosis-coagulation-anoxic hydrolysis combined emergency treatment method Active CN111892238B (en)

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CN106517669B (en) * 2016-12-16 2019-10-01 安徽师范大学 The positive osmosis treatment system of black smelly water A/O and treatment process
CN108706839B (en) * 2018-07-31 2024-04-12 山东默同生态有限公司 High-salt comprehensive wastewater treatment system for chemical industry park
CN210206461U (en) * 2019-04-09 2020-03-31 中海石油炼化有限责任公司 Concentration device for low-hardness sodium chloride solution

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