CN103663793B - High-concentration emulsified liquid wastewater treatment method - Google Patents
High-concentration emulsified liquid wastewater treatment method Download PDFInfo
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- CN103663793B CN103663793B CN201310683121.6A CN201310683121A CN103663793B CN 103663793 B CN103663793 B CN 103663793B CN 201310683121 A CN201310683121 A CN 201310683121A CN 103663793 B CN103663793 B CN 103663793B
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Abstract
The invention provides a high-concentration emulsified liquid wastewater treatment method. By the adoption of the method, high-concentration emulsified liquid wastewater is demulsified jointly by sodium polyacrylate and polyaluminium chloride without being blended with low-concentration wastewater, a relatively good demulsification effect is achieved in the conditions of a relatively small agent adding quantity and short processing time, and the COD removal ratio is 95% above; the demulsified wastewater is oxidized by Fenton's reagent and subjected to direct static settlement and mud drainage, so that the sludge production is reduced; after the PH value of a clear liquid is adjusted to 6-9, the clear liquid is subjected to static precipitation, so that Fe<3+> in the water can be removed, effluent can reach the level III standard of the National Integrated Wastewater Discharge Standard, and can reach the level I standard of national integrated wastewater discharge standard after being treated through adopting the sequencing batch reactor activated sludge process.
Description
Technical field
The present invention is a kind of high-concentration emulsified liquid waste water treatment process, belongs to technical field of industrial sewage treatment.
Background technology
Emulsion is in the course of processing such as cutting, grinding of the machine spare and accessory parts of the industry such as mechanical workout, rolling metal, be commonly used as cooling, lubrication or the medium of transmission of pressure.Emulsion is recycling repeatedly, and in various degree putrid and deteriorated occurs, and performance reduces, and need change, define emulsifying liquid waste water.
Owing to belonging to the reluctant trade effluent of ordinary method containing a large amount of oil in water emulsions and tensio-active agent in emulsion, current treatment process mainly comprises chemical demulsification-By Bubble-floating Method, filtration method, electrocoagulation.
Chemical demulsification-By Bubble-floating Method is the traditional method of prolonged application, and this method is not very desirable to high-concentration emulsified liquid waste water treatment effect, and By Bubble-floating Method power consumption is larger simultaneously; Filtration method utilizes retaining and the mechanism such as inertial impaction, screening, surface adhesion, coalescence of granule medium filter bed, removal oil-in-water divides, current effect is preferably inorganic ceramic membrane filter method, the shortcoming of this method is that one-time investment is high, technique is more complicated, operational administrative level requirement is high, is applicable to the emulsifying liquid waste water of low concentration; Electricity flocculence be under the effect of impressed current by soluble anode dissolve bubble that the flocs unit, the electrolytic process that generate produce, the oxidisability of anode and the reductibility of negative electrode the pollutent in waste water produced flocculate, air supporting, oxidation and induction comprehensive action, the shortcoming of this method is that equipment corrosion is serious, easily blocks when waste strength is higher.
Summary of the invention
The present invention designs for the shortcoming existed in above-mentioned prior art just and provides a kind of high-concentration emulsified liquid waste water treatment process, its objective is that solution high-concentration emulsified liquid waste water demulsification is poor, process needs sewage of low concentration to blend, the problem of direct biochemical treatment difficulty.
The object of the invention is to be achieved through the following technical solutions:
This kind of high-concentration emulsified liquid waste water treatment process, described high density refers to that the value of COD is more than 50000mg/L, is characterized in that: the step of the method is:
(1) in emulsifying liquid waste water, add sodium polyacrylate 0.5g/L ~ 5g/L, stir 10min ~ 30min, in whipping process, adjust emulsifying liquid waste water pH value to 2 ~ 6, static 10min ~ 30min after stirring with sulfuric acid or hydrochloric acid, remove emulsifying liquid waste water surface oil slick, form clear liquid;
(2) adjust clear liquid pH value to 8 ~ 10 with sodium hydroxide solution, add polymerize aluminum chloride 1g/L ~ 5g/L, polyacrylamide 0.1g/L ~ 0.5g/L, quiescent setting 0.5h ~ 1h after stirring 5min ~ 20min, discharges bed mud;
(3) discharge the clear liquid PH after bed mud to 3 ~ 4 with sulfuric acid or hydrochloric acid adjustment, add Fenton reagent, H in Fenton reagent
2o
2and Fe
2+mol ratio be (50 ~ 10): 1, the mass ratio of the H2O2 in the Fenton reagent added and the COD of clear liquid is (0.5 ~ 3): 1, stirs quiescent setting 0.5h ~ 2h after 0.5h ~ 2h, discharges bed mud;
(4) adjust the clear liquid pH value after (3) step processes to 6 ~ 9 with sodium hydroxide solution, quiescent setting 0.5h ~ 2h after stirring 10min ~ 30min, discharges bed mud.
Technical solution of the present invention carries out sodium polyacrylate and poly-aluminium associating breakdown of emulsion when not blending sewage of low concentration to high-concentration emulsified liquid waste water, and under less added amount of chemical and treatment time, obtain good demulsification, COD clearance reaches more than 95%; Waste water after breakdown of emulsion process again after Fenton reagent oxidation direct quiet heavy after spoil disposal, reduce sludge yield, then adjust quiescent settings after clear liquid pH value to 6 ~ 9, remove the Fe in water
3+, water outlet can reach the grade III Standard in " national sewage comprehensive emission standard ", and water outlet can reach the primary standard in " national sewage comprehensive emission standard " again after sequencing batch active sludge process.
Embodiment
Below with reference to embodiment, technical solution of the present invention is further described:
This embodiment get the waste water that emulsifying liquid waste water is the actual generation in certain workshop, to be 93560mg/L treatment step be the COD value of this waste water:
(1) in emulsifying liquid waste water, add sodium polyacrylate 2g/L, stir 15min, in whipping process, adjust emulsifying liquid waste water pH value to 3.5, static 15min after stirring with sulfuric acid, remove emulsifying liquid waste water surface oil slick, formation clear liquid;
(2) adjust clear liquid pH value to 9.5 with sodium hydroxide solution, add polymerize aluminum chloride 2g/L, polyacrylamide 0.3g/L, quiescent setting 1h after stirring 20min, discharges bed mud, and measuring clear liquid COD value is 4260mg/L;
(3) discharge the clear liquid PH after bed mud to 3.5 with sulfuric acid adjustment, add H
2o
24.5g/L, adds Fe
3+quiescent setting 2h after 0.37g/L stirring 1h, discharges bed mud;
(4) adjust the clear liquid pH value after (3) step processes to 9 with sodium hydroxide solution, quiescent setting 2h after stirring 20min, discharges bed mud, and mensuration clear liquid COD value is 467mg/L, BOD value is 79mg/L.
Because treatment scheme of the present invention is relatively long, and emulsifying liquid waste water output is relatively very little, the equipment operating performance that employing runs continuously when blending without sewage of low concentration can not be desirable, also difficult realization simultaneously, therefore the present invention is directed to the waste water that the process water yield is relatively large, be applicable to adopting semicontinuous sequence batch (processing mode, for the waste water that the process water yield is relatively little, be applicable to adopting complete sequence batch (processing mode.
Compared with prior art, do not need when the advantage of technical solution of the present invention is emulsifying liquid waste water process to blend sewage of low concentration, after the process of two-stage associating breakdown of emulsion, COD goes processing rate to reach more than 95%, the grade III Standard in " national sewage comprehensive emission standard " can be reached again after Fenton reagent oxide treatment, water outlet directly can carry out biochemical treatment, can reach the primary standard in " national sewage comprehensive emission standard " after biochemical treatment.
Claims (1)
1. a high-concentration emulsified liquid waste water treatment process, described high density refers to that the value of COD is more than 50000mg/L, is characterized in that: the step of the method is:
(1) in emulsifying liquid waste water, add sodium polyacrylate 0.5g/L ~ 5g/L, stir 10min ~ 30min, in whipping process, adjust emulsifying liquid waste water pH value to 2 ~ 6, static 10min ~ 30min after stirring with sulfuric acid or hydrochloric acid, remove emulsifying liquid waste water surface oil slick, form clear liquid;
(2) adjust clear liquid pH value to 8 ~ 10 with sodium hydroxide solution, add polymerize aluminum chloride 1g/L ~ 5g/L, polyacrylamide 0.1g/L ~ 0.5g/L, quiescent setting 0.5h ~ 1h after stirring 5min ~ 20min, discharges bed mud;
(3) discharge the clear liquid pH after bed mud to 3 ~ 4 with sulfuric acid or hydrochloric acid adjustment, add Fenton reagent, H in Fenton reagent
2o
2and Fe
2+mol ratio be (50 ~ 10): 1, the H in the Fenton reagent added
2o
2be (0.5 ~ 3) with the mass ratio of the COD of clear liquid: 1, stir quiescent setting 0.5h ~ 2h after 0.5h ~ 2h, discharge bed mud;
(4) adjust the clear liquid pH value after (3) step processes to 6 ~ 9 with sodium hydroxide solution, quiescent setting 0.5h ~ 2h after stirring 10min ~ 30min, discharges bed mud.
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| CN201310683121.6A CN103663793B (en) | 2013-12-12 | 2013-12-12 | High-concentration emulsified liquid wastewater treatment method |
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| CN103663793A CN103663793A (en) | 2014-03-26 |
| CN103663793B true CN103663793B (en) | 2014-12-17 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000708A (en) * | 2015-07-01 | 2015-10-28 | 上海幽岫环保科技有限公司 | Waste emulsion quantitative reduction processing technology and apparatus |
| CN105906118B (en) * | 2016-05-05 | 2019-02-26 | 上海交通大学 | A kind of machine cut emulsified waste liquid less salt reuse technology |
| CN106007070B (en) * | 2016-06-29 | 2019-04-02 | 江汉大学 | A kind of processing method of the water base cutting waste fluid of high concentration |
| CN106115957A (en) * | 2016-07-06 | 2016-11-16 | 郑州西利康新材料有限公司 | A kind of metal cutting emulsifying liquid waste water breakdown of emulsion hyperfiltration treatment method |
| CN112607962A (en) * | 2020-12-04 | 2021-04-06 | 上海天汉环境资源有限公司 | Emulsion wastewater treatment method and system |
| CN114735789B (en) * | 2022-04-20 | 2024-02-27 | 青岛水清木华环境工程有限公司 | Demulsifier for oil-containing emulsion sewage treatment, preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6034792A (en) * | 1983-08-05 | 1985-02-22 | Hitachi Plant Eng & Constr Co Ltd | Treatment of waste water containing oil |
| CA2531169C (en) * | 2005-12-28 | 2009-10-20 | Omtec Inc. | Spent metalworking fluid treatment system |
| CN101139142A (en) * | 2007-08-21 | 2008-03-12 | 洪骧龙 | Oily sewage processing method |
| CN101700941B (en) * | 2009-11-20 | 2011-11-09 | 上海应用技术学院 | Method for demulsifying and purifying waste emulsion produced by dyeing high-end ribbons |
| CN102936074B (en) * | 2012-12-03 | 2014-11-26 | 浙江嘉澳环保科技股份有限公司 | Pretreatment method of epoxy type plasticizer production wastewater |
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Address after: 100011 Beijing Xicheng District Dewai Street No. 12 Patentee after: CHINA AVIATION PLANNING AND DESIGN INSTITUTE (GROUP) CO., LTD. Address before: 100011 Beijing Xicheng District Dewai Street No. 12 Patentee before: China Aviation Planning and Construction Development Co., Ltd. |