CN105366863A - High-efficient eco-friendly processing method for reducing COD in sewage - Google Patents
High-efficient eco-friendly processing method for reducing COD in sewage Download PDFInfo
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- CN105366863A CN105366863A CN201510822497.XA CN201510822497A CN105366863A CN 105366863 A CN105366863 A CN 105366863A CN 201510822497 A CN201510822497 A CN 201510822497A CN 105366863 A CN105366863 A CN 105366863A
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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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- 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 Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a high-efficient eco-friendly processing method for reducing COD in sewage. The method comprises the following steps: high COD waste water is pretreated, wherein SS content of the pretreated waste water is less than 20 ppm, then desalination processing is carried out, the waste water after being processed with desalination is performed with COD separation processing, the COD separation processing is characterized in that the waste water is heated to temperature of 70-110 DEG C for 10-120 minutes, insulation is carried out after a heating process, and gas-liquid separation is performed, the separated liquid is cooled to normal temperature, and then is discharged. According to the invention, quality requirement for the sewage is low, inorganic salt content can reach 20%, and COD content can reach 10%. The processing method is more eco-friendly, and addition of bacterial fungi or a strong oxidizing agent cannot be required.
Description
Technical field
The COD that the present invention relates to a kind of high pollution concentration sewage removes technique, and specifically a kind of high-efficiency environment friendly reduces the treatment process of COD in sewage, belongs to sewage treatment process.
Background technology
Chemical oxygen demand (COD), also known as chemical oxygen demand (chemicaloxygendemand), is called for short COD.Be utilize chemical oxidizing agent (as potassium permanganate) by an oxidisable substance in water (as organism, nitrite, ferrous salt, sulfide etc.) oxygenolysis, then calculate the consumption of oxygen according to the gauge of residual oxygenant.It is the same with biochemical oxygen demand (BOD) (BOD), is the important indicator representing water pollution degree.The unit of COD is ppm or mg/litre, and its value is less, illustrates that water pollution degree is lighter.
Along with technical renovation and the high speed development of industry, increasing waste water quality has the feature such as difficult for biological degradation, high COD.Current Environmental Protection Situation is increasingly severe, and environmental issue has become the hot issue that the common people pay close attention to, and in industrial enterprise, the qualified discharge of sewage becomes the rigid index of Business survival already.But the difficulty of sewage disposal is large in multiple industry, cost is high, not easily qualified up to standard, day by day govern the survival and development of enterprise.At present, the method removing COD in sewage has biochemical process, oxidation style, physical sedimentation method etc.These traditional way ubiquity influent qualities require that strict, applicable water sample is few, kinds of processes coordinates technical process length, investment working cost high, safeguard complexity, easily produce secondary pollution, the shortcomings such as processing efficiency is low, the waste water COD produced in some chemical industry can up to tens thousand of and even hundreds thousand of milligrams per liter.Traditional physical sedimentation method cannot directly process these waste water.
Therefore, the study hotspot that high-COD waste water is sewage treatment industry always how is processed.
Summary of the invention
For the deficiencies in the prior art, the invention provides the treatment process that a kind of high-efficiency environment friendly reduces COD in sewage, the method increase the clearance of COD in various trade effluent, investment running cost is low, and treatment scheme is short, and the qualified of effluent quality is stablized.Compared with conventional processes, exempt biochemical grade for process operation; Do not need to add the chemical agents such as oxygenant, secondary pollution can not be produced and pollute, high-efficiency environment friendly.
Term illustrates:
Sewage, is also waste water, comprises trade effluent, sanitary wastewater.
COD, i.e. chemical oxygen demand (COD) are under certain conditions, when adopting certain strong oxidizer process water sample, and the oxidant content consumed.It is the index representing that in water, reducing substances is how many.Often as weighing the how many index of Organic substance in water matter content.Chemical oxygen demand (COD) is larger, illustrates that water body is more serious by organic pollution.
Waste water ss: refer to solid suspension substrate concentration, is suspended in the solid matter in water, and comprise the inorganics of water fast, organism and silt particle, clay, microorganism etc., general unit is: mg/L.
Technical scheme of the present invention is as follows:
High-efficiency environment friendly reduces a treatment process of COD in sewage, comprises step as follows:
(1) high-COD waste water is carried out pre-treatment, make the waste water SS content after pre-treatment be less than 20ppm;
(2) waste water after pre-treatment carries out desalting treatment, and the waste water saltiness after desalting treatment is less than or equal to 700ppm;
(3) waste water after desalting treatment carries out COD separating treatment, described COD separating treatment is that waste water is heated to 70 ~ 110 DEG C, heat-up time 10 ~ 120min, heating after insulation carries out gas-liquid separation, the liquid cooling obtained after separation is to normal temperature qualified discharge.
The present invention is preferred, and the pre-treatment described in step (1) is flocculation treatment, and the flocculation agent of use is polyacrylamide, one or more combinations in sodium polyacrylate, iron trichloride, aluminum chloride.
Preferred further, the dosage of flocculation agent is 5 ~ 20ppm.
The present invention is preferred, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 70 ~ 110 DEG C, heat-up time 10 ~ 120min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water.
The present invention is preferred, the COD tripping device that in step (3), COD separating treatment uses comprises well heater, separate reactor and the water cooler of connecting successively, described well heater comprises water back and heating interlayer, water back is communicated with separate reactor, current stabilization matrix is filled with in the cavity of separate reactor, water cooler comprises cooling duct and cooling sandwith layer, and cooling duct is communicated with separate reactor.
Preferred further, in heating interlayer, be filled with heating steam, heating steam temperature 140 ~ 145 DEG C.
The present invention is preferred, and in pre-treatment, desalting treatment, COD separating treatment, waste water ph controls to 6 ~ 8.
The present invention is preferred, gas-liquid separation hydraulic detention time 10 ~ 30min, gas-liquid separation temperature 80 ~ 100 DEG C.
The present invention is preferred, and the waste water of qualified discharge enters aftertreatment and carries out harmless treatment, and aftertreatment to a small amount of dense water being rich in COD carries out burning or import other COD and produces the harmlessness disposing measures such as technique, can according to the actual requirements or existence conditions select.
The present invention is preferred, Heating temperature 90 ~ 110 DEG C in step (3), 10 ~ 20min between heat-up time.
Before process of the present invention in high pollution concentration sewage COD content range generally tens of to tens thousand of ppm.COD of sewage content is after treatment generally below 45ppm by this area custom requirements.
Excellent results of the present invention:
Compared with traditional water treatment mode, the quality requirements of the present invention to sewage is lower, and inorganic salt content can reach 20%, COD content can reach 10%.Processing mode is environmental protection more, need not add biological mushroom or strong oxidizer.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that high-efficiency environment friendly reduces the treatment process of COD in sewage, and wherein, 1 is COD tripping device for pre-treatment pond, 2 be desalting plant, 3.
Fig. 2 is the concrete schematic diagram of COD tripping device in Fig. 1, wherein, 1 be well heater, 2 is separate reactor, 3 is water cooler, 4 for take away pump.
Fig. 3 is the schematic flow sheet of the treatment process of COD in conventional sewage, wherein, 1 be settling bowl, 2 is desalting plant, 3 for biochemical treatment apparatus.
Fig. 4 is the schematic flow sheet of biochemical sewage treatment device in Fig. 3, wherein, 1 be neutralization tank, 2 be coagulation basin, 3 be settling tank, 4 be biochemical A pond, 5 be biochemical O pond, 6 be second pond, 7 for oxidation pond 1,8 for oxidation pond 2,9 is sandfiltration pot, 10 is biochemical sludge sump, 11 is materialized mud pond, 12 is blower fan, 13 is oxygenant.
Embodiment
Further illustrate the present invention below in conjunction with embodiment, but be not limited thereto.
Embodiment 1:
High-efficiency environment friendly reduces a treatment process of COD in sewage, and as shown in Figure 1, step is as follows for the schematic flow sheet for the treatment of process:
(1) high-COD waste water COD content is 23000ppm, inorganic salt content is 5%, adds flocculation agent polyacrylamide and carry out pre-treatment in high-COD waste water, and the dosage of flocculation agent is 10ppm, make the waste water SS content after pre-treatment be less than 20ppm, after sedimentation clear liquid after pre-treatment.
(2) after pre-treatment, clear liquid enters desalting plant and carries out desalting treatment, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 90 DEG C, heat-up time 20min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water; Waste water saltiness after desalting treatment is less than 500ppm; (sodium chloride content≤500ppm)
(3) waste water after desalting treatment enters and carries out COD separating treatment in COD tripping device, COD separating treatment is that waste water is heated to 103 DEG C, heat-up time 20min, heating after insulation carries out gas-liquid separation, the liquid cooling obtained after separation is to normal temperature qualified discharge.The water COD flowed out from COD tripping device 3 is reduced to 20ppm.
COD tripping device structure as shown in Figure 2, comprise well heater 1, separate reactor 2 and the water cooler 3 of connecting successively, described well heater 1 comprises water back and heating interlayer, water back is communicated with separate reactor 2, in the cavity of separate reactor 2, be filled with current stabilization matrix, water cooler 3 comprises cooling duct and cooling sandwith layer, and cooling duct is communicated with separate reactor 2, heating steam is filled with, heating steam temperature 140 ~ 145 DEG C in heating interlayer.
Embodiment 2:
High-efficiency environment friendly reduces a treatment process of COD in sewage, and as shown in Figure 1, step is as follows for the schematic flow sheet for the treatment of process:
(1) high-COD waste water COD content is 5000ppm, inorganic salt content is 8%, adds flocculation agent polyacrylamide and carry out pre-treatment in high-COD waste water, and the dosage of flocculation agent is 5ppm, make the waste water SS content after pre-treatment be less than 10ppm, after sedimentation clear liquid after pre-treatment.
(2) after pre-treatment, clear liquid enters desalting plant and carries out desalting treatment, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 100 DEG C, heat-up time 15min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water; Waste water saltiness after desalting treatment is less than 600ppm; (sodium chloride content≤600ppm)
(3) waste water after desalting treatment enters and carries out COD separating treatment in COD tripping device, COD separating treatment is that waste water is heated to 105 DEG C, heat-up time 18min, heating after insulation carries out gas-liquid separation, the liquid cooling obtained after separation is to normal temperature qualified discharge.The water COD flowed out from COD tripping device 3 is reduced to 32ppm.
Embodiment 3:
High-efficiency environment friendly reduces a treatment process of COD in sewage, and as shown in Figure 1, step is as follows for the schematic flow sheet for the treatment of process:
(1) high-COD waste water COD content is 200ppm, inorganic salt content is 8%, adds flocculation agent polyacrylamide and carry out pre-treatment in high-COD waste water, and the dosage of flocculation agent is 8ppm, make the waste water SS content after pre-treatment be less than 5ppm, after sedimentation clear liquid after pre-treatment.
(2) after pre-treatment, clear liquid enters desalting plant and carries out desalting treatment, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 105 DEG C, heat-up time 10min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water; Waste water saltiness after desalting treatment is less than 600ppm; (sodium chloride content≤600ppm)
(3) waste water after desalting treatment enters and carries out COD separating treatment in COD tripping device, COD separating treatment is that waste water is heated to 95 DEG C, heat-up time 30min, heating after insulation carries out gas-liquid separation, the liquid cooling obtained after separation is to normal temperature qualified discharge.The water COD flowed out from COD tripping device 3 is reduced to 11ppm.
Comparative example 1:
A treatment process of COD in sewage, as shown in Figure 3, step is as follows for the schematic flow sheet for the treatment of process:
(1) high-COD waste water COD content is 800ppm, inorganic salt content is 8%, adds flocculation agent polyacrylamide and carry out pre-treatment in high-COD waste water, and the dosage of flocculation agent is 8ppm, make the waste water SS content after pre-treatment be less than 5ppm, after sedimentation clear liquid after pre-treatment.
(2) after pre-treatment, clear liquid enters desalting plant and carries out desalting treatment, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 105 DEG C, heat-up time 10min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water; Waste water saltiness after desalting treatment is less than 900ppm; (sodium chloride content≤900ppm)
(3) waste water after desalting treatment enters biochemical treatment apparatus 3.In biochemical treatment apparatus 3, sewage is through biochemical reactions such as aerations.The water COD flowed out from biochemical treatment apparatus 3 is reduced to 40ppm.
Comparative example 2:
A treatment process of COD in sewage, as shown in Figure 3, step is as follows for the schematic flow sheet for the treatment of process:
(1) high-COD waste water COD content is 8000ppm, inorganic salt content is 7%, adds flocculation agent polyacrylamide and carry out pre-treatment in high-COD waste water, and the dosage of flocculation agent is 8ppm, make the waste water SS content after pre-treatment be less than 5ppm, after sedimentation clear liquid after pre-treatment.
(2) after pre-treatment, clear liquid enters desalting plant and carries out desalting treatment, and desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 105 DEG C, heat-up time 10min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water; Waste water saltiness after desalting treatment is less than 800ppm; (sodium chloride content≤900ppm)
(3) waste water after desalting treatment enters biochemical treatment apparatus 3.In biochemical treatment apparatus 3, sewage is through biochemical reactions such as aerations.The water COD flowed out from biochemical treatment apparatus 3 is reduced to 1500ppm.Needed for this flow process mesophytization device, biological inoculum can only be survived 2 days, and device has not possessed continuous service ability.
Claims (9)
1. high-efficiency environment friendly reduces a treatment process of COD in sewage, comprises step as follows:
(1) high-COD waste water is carried out pre-treatment, make the waste water SS content after pre-treatment be less than 20ppm;
(2) waste water after pre-treatment carries out desalting treatment, and the waste water saltiness after desalting treatment is less than or equal to 700ppm;
(3) waste water after desalting treatment carries out COD separating treatment, described COD separating treatment is that waste water is heated to 70 ~ 110 DEG C, heat-up time 10 ~ 120min, heating after insulation carries out gas-liquid separation, the liquid cooling obtained after separation is to normal temperature qualified discharge.
2. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, pre-treatment described in step (1) is flocculation treatment, and the flocculation agent of use is polyacrylamide, one or more combinations in sodium polyacrylate, iron trichloride, aluminum chloride.
3. high-efficiency environment friendly according to claim 2 reduces the treatment process of COD in sewage, and it is characterized in that, the dosage of flocculation agent is 5 ~ 20ppm.
4. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, desalting treatment comprises evaporation process and filtration treatment, the temperature of evaporation process 70 ~ 110 DEG C, heat-up time 10 ~ 120min, evaporation process is complete carry out filtration treatment obtain desalting treatment after waste water.
5. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, the COD tripping device that in step (3), COD separating treatment uses comprises well heater, separate reactor and the water cooler of connecting successively, described well heater comprises water back and heating interlayer, water back is communicated with separate reactor, current stabilization matrix is filled with in the cavity of separate reactor, water cooler comprises cooling duct and cooling sandwith layer, and cooling duct is communicated with separate reactor.
6. high-efficiency environment friendly according to claim 5 reduces the treatment process of COD in sewage, it is characterized in that, in heating interlayer, is filled with heating steam, heating steam temperature 140 ~ 145 DEG C.
7. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, in pre-treatment, desalting treatment, COD separating treatment, waste water ph controls to 6 ~ 8.
8. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, Heating temperature 90 ~ 110 DEG C in step (3), 10 ~ 20min between heat-up time.
9. high-efficiency environment friendly according to claim 1 reduces the treatment process of COD in sewage, it is characterized in that, gas-liquid separation hydraulic detention time 10 ~ 30min in step (3), gas-liquid separation temperature 80 ~ 100 DEG C.
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| CN201510822497.XA CN105366863B (en) | 2015-11-24 | 2015-11-24 | The processing method of COD in a kind of reduction sewage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587470A (en) * | 2016-11-23 | 2017-04-26 | 山东东岳氟硅材料有限公司 | Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid |
| CN107226579A (en) * | 2016-03-24 | 2017-10-03 | 福建省三净环保科技有限公司 | A kind of sewage disposal device |
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| CN103073140A (en) * | 2012-11-22 | 2013-05-01 | 南阳理工学院 | Flocculation deposition-evaporation-membrane separation combined technology for processing maleic anhydride industrial acidic waste water |
| CN103482715A (en) * | 2013-09-16 | 2014-01-01 | 惠州Tcl环境科技有限公司 | High-concentration organic waste water evaporating and concentration processing method |
| CN105000734A (en) * | 2015-06-18 | 2015-10-28 | 四川珍福堂商贸有限公司 | Pharmaceutical wastewater treating system and method |
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2015
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| CN103073140A (en) * | 2012-11-22 | 2013-05-01 | 南阳理工学院 | Flocculation deposition-evaporation-membrane separation combined technology for processing maleic anhydride industrial acidic waste water |
| CN103482715A (en) * | 2013-09-16 | 2014-01-01 | 惠州Tcl环境科技有限公司 | High-concentration organic waste water evaporating and concentration processing method |
| CN105000734A (en) * | 2015-06-18 | 2015-10-28 | 四川珍福堂商贸有限公司 | Pharmaceutical wastewater treating system and method |
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| 薛文源: "降低污水中的COD值的方法", 《中国给水排水》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107226579A (en) * | 2016-03-24 | 2017-10-03 | 福建省三净环保科技有限公司 | A kind of sewage disposal device |
| CN106587470A (en) * | 2016-11-23 | 2017-04-26 | 山东东岳氟硅材料有限公司 | Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid |
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