CN105523656A - Sewage treatment method - Google Patents
Sewage treatment method Download PDFInfo
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- CN105523656A CN105523656A CN201410506778.XA CN201410506778A CN105523656A CN 105523656 A CN105523656 A CN 105523656A CN 201410506778 A CN201410506778 A CN 201410506778A CN 105523656 A CN105523656 A CN 105523656A
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Abstract
The present invention relates to a sewage treatment method for sewage pretreatment and deep treatment, wherein the sewage treatment method has characteristics of high treatment efficiency, high operation flexibility, less agent types, and less agent consumption. The sewage treatment method comprises: A, taking a sewage sample to be treated, adjusting the pH value of the sample to 5.5-6.0, adding FeSO4.7H2O, adjusting the pH value of the sample to 3.0-6.0, adding H2O2, controlling the redox potential at 180-220 mv, and carrying out a stirring reaction for 10-20 min to make the agent and the sample be subjected to a complete contact reaction; B, adjusting the pH value of the mixed liquid obtained in the step A to 8.0-9.0, adding polyacrylamide, and uniformly mixing; and C, stirring the mixing liquid obtained in the step B for 3-5 min at a stirring speed of 50-300 r/min to completely perform a coagulation reaction, and standing to precipitate, wherein the supernatant is the treated effluent.
Description
Technical field
The present invention relates to a kind of sewage water treatment method, particularly relate to a kind of sewage water treatment method that can be used for sewage disinfection treatment and advanced treatment.
Background technology
The light oil such as by-product gas, petroleum naphtha in producing with oil refining or heavy oil are that raw material carries out thermo-cracking and produces the industrial chemicals such as ethene single step reaction of going forward side by side and synthesize various organic chemistry product, and the waste water of discharging in the process is called petrochemical wastewater.Synthetic rubber and synthetic plastics, fiber, the products such as washing composition and benzene, naphthalene, methyl alcohol, glycerine, the waste water of discharging in the industrial chemicals production processes such as acetaldehyde is petrochemical wastewater, as: Nitrilon waste water, oil refinery effluent and petrochemical industrial park comprehensive wastewater, pollutent composition in this sewage is complicated, toxicity is high, there is organic sulfonate, EDTA, the recalcitrant substances such as polyoxyethylene nonylphenol ether, also have the Biostatic compositions such as certain sulfate radical, cause the biodegradability of waste water very low, also finish is there is in waste water, the polymkeric substance of various molecular weight, these materials are present in water with the form of colloidal suspended substance, be difficult to natural subsidence.Therefore be the industrial organic waste water of a kind of typical high density, high pollution, high poison, difficult degradation, be difficult to realize organic permineralization in existing biochemistry treatment process, moreover, the petrochemical wastewater such as Nitrilon waste water and refinery water also exists that intractability is comparatively large, Meteorological is higher, form the problems such as severe contamination to the pollution of environment.Along with deepening constantly of National Sustainable Development Strategies, improve and solve the problem of petrochemical wastewater environmental pollution, become a problem in the urgent need to address.
Poisonous Persistent organic pollutants containing high density in the sewage that current China acrylic fiber production process process produces, the grease molecules of waste water also simultaneously containing a large amount of high molecular that refinery is discharged, after adopting existing biochemical treatment system process, the COD of bio-chemical effluent etc. also can only reach petrifaction sewage COD secondary discharge standard reluctantly.Therefore, the treatment technology of exploitation petrochemical wastewater, to improve waste water COD clearance, makes water outlet COD reach petrifaction sewage COD first discharge standard very important to petrochemical wastewater process.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of processing efficiency compared with high, that turndown ratio is large, reagent type is few, dosage is few sewage water treatment method.
A kind of sewage water treatment method, comprises the following steps:
A, get pending Wastewater Sample, FeSO47H2O is added after regulating water sample pH value to 5.5-6.0, H2O2 is added and controlled oxidization reduction potential is 180-220mv after regulating water sample pH value to 3.0 ~ 6.0 again, stirring reaction 10 ~ 20min makes medicament and water sample fully contact and react, wherein: often process 0.5L Wastewater Sample, add 0.1-0.7gFeSO47H2O and 0.1-0.16gH2O2;
PH value to 8.0 ~ 9.0 of B, regulating step A gained mixed solution, then add polyacrylamide (being abbreviated as PAM), mix, wherein: in steps A, often process 0.5L Wastewater Sample, in step B, add 1-2mg polyacrylamide;
C, step B gained mixed solution is stirred 3 ~ 5min under the stirring velocity of 50-300r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet.
Sewage water treatment method of the present invention, wherein said steps A is: get pending Wastewater Sample, FeSO47H2O is added after regulating water sample pH value to 5.5 ~ 6.0, H2O2 is added and controlled oxidization reduction potential is 200mv after regulating water sample pH value to 4.0 ~ 5.0 again, stirring reaction 10-20min makes medicament and water body fully contact and react, wherein: often process 0.5L Wastewater Sample, add 0.5-0.7gFeSO47H2O and 0.1-0.16gH2O2.
Sewage water treatment method of the present invention, wherein said sewage is petrochemical wastewater.
Sewage water treatment method of the present invention, wherein said petrochemical wastewater is the water inlet of acrylic fibers biochemical waste water, petrochemical industrial park comprehensive wastewater or refinery biochemistry.
Sewage water treatment method of the present invention, wherein: the FeSO47H2O solution of FeSO47H2O used to be concentration be 100g/L in steps A, H2O2 adds with the hydrogen peroxide solution of 10 volume %.
Sewage water treatment method of the present invention, wherein: the mode adding polyacrylamide in step B is that gradation adds, and first adds polyacrylamide needed for half, adds polyacrylamide needed for second half again after 20s.
Sewage water treatment method of the present invention, wherein: in step B, polyacrylamide used is polyacrylamide solution.
Sewage water treatment method of the present invention, wherein: in step B, polyacrylamide used is the polyacrylamide solution of 1g/L.
Sewage water treatment method of the present invention, wherein: in steps A and step B to pH value be adjusted to conventional employing acidic substance or alkaline matter regulates, its middle acid substance is sulfuric acid, hydrochloric acid or nitric acid; Alkaline matter is lime, milk of lime, soda ash or sodium hydroxide.
Sewage water treatment method of the present invention, wherein: described polyacrylamide is cationic-type polyacrylamide.Polyacrylamide that is cationic or anionic is selected to be select according to water quality.
Compared with the existing technology, its advantage is sewage water treatment method of the present invention:
1, processing efficiency is higher.By sewage water treatment method of the present invention, the CODcr of water body can decline more than 10%, the highlyest declines more than 60%.
2, turndown ratio is large.This Technology is once come into operation, and flooding quantity change fluctuation can not affect the stability of operation to a great extent.
3, medicament kind is few, and dosage is few.Present method has just used a small amount of FeSO47H2O, H2O2 and polyacrylamide, not extra dosing coagulant, and this greatly reduces cost of investment, there is practical feasibility, compared with simple chemical method, during same treatment effect, medicament usage quantity reduces 40% ~ 60%, reduces production run cost.
4, construction investment is low.Do not need complicated pre-processing device, floor space is relatively little, and sewage treatment project investment cost is low.
5, applied widely.Except the pretreatment and advanced treatment that can be used for petrochemical wastewater, the pretreatment and advanced treatment of the waste water such as papermaking, pharmacy, some fine chemical industry can also be used for.
Embodiment
Embodiment 1:
The former water pH value of A, acrylic fibers bio-chemical effluent is 6.8 ~ 7.5, get the former water water sample of the pending acrylic fibers bio-chemical effluent of 500ml, regulate the pH value of water sample to 5.5-6.0 with H2SO4 solution, add the FeSO47H2O solution 1ml of 100g/L afterwards, after regulating pH to 2.5-3.0 again, add 0.1gH2O2 and control its redox potential at 180mv, stirring reaction 20min, medicament is fully contacted, sufficient reacting with water body;
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 0.5ml concentration is 1g/L, add the cationic PAM that 0.5ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 4min under the stirring velocity of 100r/min, make coagulating abundant, staticly settle, supernatant liquor is water outlet after process, and before and after this water sample process, water-quality COD cr changes as shown in table 1: the change of water quality after table 1. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 250.4 | ||
| Process water | 230.4 | 8.0 | 7.42 |
Embodiment 2:
The former water pH value of A, acrylic fibers bio-chemical effluent is 6.8 ~ 7.5, get the former water water sample of the pending acrylic fibers bio-chemical effluent of 500ml, with the pH to 5.5-6.0 of the adjustment water sample of H2SO4 solution, add the FeSO47H2O solution 3ml of the 100g/L prepared afterwards, regulate pH to 3.0-3.5, add 0.1gH2O2 and control its redox potential at 190mv, stirring reaction 10min, medicament is fully contacted, sufficient reacting with water body.
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 3min under the stirring velocity of 200r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 2:
Change of water quality after table 2. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 250.4 | ||
| Process water | 200.4 | 20.0 | 7.41 |
Embodiment 3:
The former water pH value of A, acrylic fibers bio-chemical effluent is 6.8 ~ 7.5, get the acrylic fibers bio-chemical effluent that 500ml is pending, pH to the 5.5-6.0 of water sample is regulated with H2SO4 solution, add the 100g/LFeSO47H2O solution 5ml prepared afterwards, regulate pH to 3.5 ~ 4.0, add 0.1gH2O2 and control its redox potential at 200mv, stirring reaction 15min, medicament is fully contacted, sufficient reacting with water body;
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 5min under the stirring velocity of 50r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 3:
Change of water quality after table 3. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 250.4 | ||
| Process water | 140.4 | 43.9 | 7.61 |
Embodiment 4:
The former water pH value of A, acrylic fibers bio-chemical effluent is 6.8 ~ 7.5, get the acrylic fibers bio-chemical effluent that 500ml is pending, the pH to 5.5-6.0 of water sample is regulated with H2SO4 solution, add the FeSO47H2O solution 7ml of 100g/L afterwards, regulate pH to 4.5 ~ 5.0 again, add 0.1gH2O2 and control its redox potential at 200mv, stirring reaction 15min, medicament is fully contacted, sufficient reacting with water body;
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 4min under the stirring velocity of 100r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 4:
Change of water quality after table 4. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 256.0 | ||
| Process water | 120.0 | 53.1 | 7.85 |
Embodiment 5:
The former water pH value of A, acrylic fibers bio-chemical effluent is 6.8 ~ 7.5, get the acrylic fibers bio-chemical effluent that 500ml is pending, with pH to the 5.5-6.0 of the adjustment water sample of 10%H2SO4 solution, add the 100g/LFeSO47H2O solution 3ml prepared afterwards, regulate pH to 5.0 ~ 5.5, add 0.1gH2O2 and control its redox potential at 220mv, under the stirring velocity of 400r/min, stir 10 ~ 20min, medicament is fully contacted, sufficient reacting with water body.
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 4min under the stirring velocity of 100r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 5:
Change of water quality after table 5. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 250.4 | ||
| Process water | 178.6 | 28.7 | 7.76 |
Embodiment 6:
The former water pH value of A, refinery biochemistry water inlet is 7.8, get the former water water sample of refinery biochemistry water inlet that 500ml is pending, the pH5.5-6.0 of water sample is regulated with H2SO4 solution, add the FeSO47H2O solution 5ml of 100g/L afterwards, regulate pH to 4.5-5.0 again, add 0.1gH2O2 and control its redox potential at 200mv, stirring reaction 10min, medicament is fully contacted, sufficient reacting with water body;
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution; C, step B gained mixed solution is stirred 4min under the stirring velocity of 100r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 6:
Change of water quality after table 6. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 236.0 | ||
| Process water | 84.0 | 64.4 | 7.60 |
Embodiment 7:
The former water pH value of A, the large Sewage Plant in petrochemical industry garden biochemistry water inlet is 7.4, get the former water water sample of large Sewage Plant biochemistry water inlet that 500ml is pending, the pH to 5.5-6.0 of water sample is regulated with H2SO4 solution, add the FeSO47H2O solution 7ml of 100g/L afterwards, regulate pH to 4.0 ~ 5.0 again, add 0.16gH2O2 and control its redox potential at 200mv, stirring reaction 20min, medicament is fully contacted, sufficient reacting with water body.
B, use sodium hydroxide solution regulating step A gained pH of mixed, after 8.0 ~ 9.0, add the cationic PAM that 1ml concentration is 1g/L, add the cationic PAM that 1ml concentration is 1g/L again after reaction 20s in mixed solution;
C, step B gained mixed solution is stirred 4min under the stirring velocity of 100r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet, and before and after this water sample process, water-quality COD Cr changes as shown in table 7:
Change of water quality after table 7. processes
| CODcr（mg/L） | CODcr clearance % | Water outlet pH | |
| Former water | 458.0 | ||
| Process water | 150.0 | 67.2 | 7.84 |
Above-described embodiment is only be described the preferred embodiment of the present invention, not to model of the present invention
Enclose and limit, under not departing from the present invention and designing the prerequisite of spirit, those of ordinary skill in the art are to technical side of the present invention
The various distortion that case is made and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (5)
1. a sewage water treatment method, is characterized in that: comprise the following steps:
A, get pending Wastewater Sample, FeSO47H2O is added after regulating water sample pH value to 5.5-6.0, H2O2 is added and controlled oxidization reduction potential is 180-220mv after regulating water sample pH value to 3.0 ~ 6.0 again, stirring reaction 10 ~ 20min makes medicament and water sample fully contact and react, wherein: often process 0.5L Wastewater Sample, add 0.1-0.7gFeSO47H2O and 0.1-0.16gH2O2;
PH value to 8.0 ~ 9.0 of B, regulating step A gained mixed solution, then add polyacrylamide, mix, wherein: in steps A, often process 0.5L Wastewater Sample, in step B, add 1-2mg polyacrylamide;
C, step B gained mixed solution is stirred 3 ~ 5min under the stirring velocity of 50-300r/min, make coagulating abundant, staticly settle, supernatant liquor is process water outlet.
2. sewage water treatment method according to claim 1, it is characterized in that: described steps A is: get pending Wastewater Sample, FeSO47H2O is added after regulating water sample pH value to 5.5 ~ 6.0, H2O2 is added and controlled oxidization reduction potential is 200mv after regulating water sample pH value to 4.0 ~ 5.0 again, stirring reaction 10-20min makes medicament and water body fully contact and react, wherein: often process 0.5L Wastewater Sample, add 0.5-0.7gFeSO47H2O and 0.1-0.16gH2O2.
3. sewage water treatment method according to claim 2, is characterized in that: described sewage is petrochemical wastewater.
4. sewage water treatment method according to claim 3, is characterized in that: described petrochemical wastewater is the water inlet of acrylic fibers biochemical waste water, petrochemical industrial park comprehensive wastewater or refinery biochemistry.
5. sewage water treatment method according to claim 4, is characterized in that: the mode adding polyacrylamide in step B is that gradation adds, and first adds polyacrylamide needed for half, adds polyacrylamide needed for second half again after 20s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410506778.XA CN105523656A (en) | 2014-09-28 | 2014-09-28 | Sewage treatment method |
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| CN201410506778.XA CN105523656A (en) | 2014-09-28 | 2014-09-28 | Sewage treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745959A (en) * | 2016-11-25 | 2017-05-31 | 南宁市黑晶信息技术有限公司 | A kind of petrochemical wastewater processing method |
| CN106745958A (en) * | 2016-11-25 | 2017-05-31 | 南宁市黑晶信息技术有限公司 | A kind of method for processing organic wastewater |
-
2014
- 2014-09-28 CN CN201410506778.XA patent/CN105523656A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745959A (en) * | 2016-11-25 | 2017-05-31 | 南宁市黑晶信息技术有限公司 | A kind of petrochemical wastewater processing method |
| CN106745958A (en) * | 2016-11-25 | 2017-05-31 | 南宁市黑晶信息技术有限公司 | A kind of method for processing organic wastewater |
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