CN102050533A - Method for treating and recycling circulating water and sewage - Google Patents
Method for treating and recycling circulating water and sewage Download PDFInfo
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- CN102050533A CN102050533A CN2009102095359A CN200910209535A CN102050533A CN 102050533 A CN102050533 A CN 102050533A CN 2009102095359 A CN2009102095359 A CN 2009102095359A CN 200910209535 A CN200910209535 A CN 200910209535A CN 102050533 A CN102050533 A CN 102050533A
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Abstract
The invention relates to a method for treating and recycling circulating water and sewage, which comprises the following steps of: adding an oxidative bactericide and a catalyst into the sewage for chemical reaction, performing flocculation precipitation on reacted wastewater, adding wastewater subjected to flocculation precipitation into a membrane system for treating, and recycling recycled water subjected to membrane treatment to a circulating water system. Compared with the prior art, the method can effectively reduce the chemical oxygen demand (COD) of the wastewater, can reduce the content of bacteria in the wastewater, and meets the requirement of recycling the treated wastewater to the circulating water system.
Description
Technical field
The present invention relates to a kind of method of waste water treating and reutilizing, especially adopt processing and the recycling method of externally discharged waste water as the sewer of the recirculated water that make up water produced of recirculated water.
Background technology
The continuous deterioration of the shortage of water resources and water body environment comes into one's own water-saving and emission-reducing work day by day.The externally discharged waste water of industrial enterprise through be back to use after the advanced treatment circulating water system as a supplement water be effective water-saving and emission-reducing measure of the most normal employing, but when reusing sewage behind recirculating cooling water system, because the inspissated of circulating water system, the COD of its sewer, total dissolved solidss (TDS) are more a lot of than adopting fresh water to exceed during water as a supplement.At present, reuse once more after many enterprises send such waste water again back to sewage work and handle has not only increased the load of sewage work, can cause also that sewer water outlet salts contg increases, the water quality variation, has increased the sewage difficulty of reuse once more.Thereby need be back to use circulating water system again after the sewer individual curing with recirculated water.At present, both at home and abroad the document of handling the back reuse about the recirculated water sewer focuses mostly on aspect suspended substance, salt amount and the bacterium in removing water, as:
In A, " energy environment protection " 2006 the 20th the 4th phases of volume " reverse osmosis process is handled the skilled industry of reuse recirculated water sewer and the used " literary composition employing " pre-treatment+reverse osmosis " art breading thermal power plant recirculated cooling water sewer has been proposed, as the method for circulating water system and boiler feedwater.
In B, " Treatment of Industrial Water " 2007 the 27th volumes o. 11th " application of membrane technique in the reuse of the circulation cooling sewer " literary composition method that adopts membrane technique (ultrafiltration-reverse osmosis combination process) the circulation sewer to be removed turbid desalination has been proposed in power plant's circulating cooling system sewerage reuse.
Above-mentioned document is primarily aimed at reuse aspect after the processing of the recirculated water sewer that make up water produced that adopts fresh water to do recirculated water, and at the processing and the reuse aspect that adopt externally discharged waste water as the sewer of the recirculated water that make up water produced of recirculated water bibliographical information is not arranged.
Thereby, need adopt a feasible method to adopt externally discharged waste water as the sewer of the recirculated water that make up water produced of recirculated water handle and reuse to circulating water system, with the water resources of saves valuable and reduce the pollution of environment.
Summary of the invention
The objective of the invention is to propose a kind of for the processing and the recycling method of employing externally discharged waste water, to reduce the amount of makeup water of recirculated water, the water resources of saves valuable as the sewer of the recirculated water that make up water produced of recirculated water.
The treatment process that the present invention proposes comprises: adding oxidizing bactericide and catalyzer carry out chemical reaction in sewage, sewage after reaction finishes carries out flocculation sediment, sewage after flocculation sediment finishes enters the film system and handles, and the middle water after film disposes is back to use circulating water system.
Treatment process of the present invention specifically comprises following step:
1), adding acid or alkali are adjusted to the pH value less than 8 in pending recirculated water sewer, in sewage, add oxidizing bactericide and catalyzer again and carry out chemical reaction, when reducing waste water COD, the free radical that produces in the oxidizing bactericide of use and the reaction process all has effective germicidal action.
2), the sewage pH value after step 1) reacted is adjusted to greater than 6, carries out flocculation precipitation reaction; In effectively reducing waste water, also can reduce the hardness of sewage in the impurity such as suspended substance, colloid.
3), step 2) waste water of reaction after finishing enters film processing system and handles, the middle water reuse after disposing is to circulating water system.
Described oxidizing bactericide can be a kind of in hypochlorite, hydrogen peroxide, ozone, the persulphate, preferred clorox; The dosage of oxidizing bactericide can be 5-800mg/L, preferred 10-300mg/L, most preferably 50-100mg/.
Described catalyzer can be an also ortho states transition metal salt of solubility, also can be transition metal oxide, preferred Fe
2+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+And Zn
2+Vitriol, nitrate or muriate in one or more, more preferably ferrous sulfate.The dosage of catalyzer can be 10-5000mg/L, preferred 20-2000mg/L, most preferably 100-500mg/.
In the step 1, the pH value of sewage can be less than 8, preferred 1-7; The time of reaction can be 5-120 minute, preferred 10-90 minute; The catalytic oxidation process is preferably under agitation carried out, and can adopt churned mechanically method, also can adopt aeration agitation or beats pump around circuit and carry out stirring method.
In the step 2: the pH value of the sewage after conditioned reaction is intact is greater than 6, preferably 6-9; The time of flocculation sediment can be 3-300 minute, preferred 5-200 minute, also can adopt the mode that adds flocculation agent to strengthen the effect of flocculation sediment in the flocculation sediment process.Said flocculation agent can be one or more in polymeric aluminum, poly-iron, polyacrylamide and other polymeric flocculants, the optimization polypropylene acid amides.
In the step 3: said film processing system is to be the treatment system of core with the reverse osmosis, can be a kind of in the combination procesies such as " ultrafiltration+reverse osmosis ", " nanofiltration+reverse osmosis ", " filtration+reverse osmosis ", preferred " ultrafiltration+reverse osmosis " treatment process.
Compared with prior art, the present invention has following advantage:
1, adds oxidizing bactericide and catalyzer in the pending recirculated water sewer, can effectively reduce the COD of waste water and can reduce bacteria content in the waste water.
2, adopt the flocculation sediment technology can further reduce the COD of waste water and can reduce impurity such as suspended substance in the waste water, colloid.
3, the sewage after the flocculation precipitation pretreatment, condition of water quality significantly improves, and the processing cost that can reduce film processing system prolongs the work-ing life of film processing system.
4, the middle water after film is handled reaches the requirement of reuse circulating water system.
5, this method treatment facility investment cost is low, and processing cost is cheap, and environmental protection, can not cause secondary pollution.
Embodiment
The present invention is further detailed explanation below in conjunction with embodiment, but the scope of protection of present invention is not limited to the scope that embodiment represents.
Among the embodiment, COD measures according to GB GB11914-1989 method; Specific conductivity is measured according to glass electrode method; Total dissolved solidss TDS is according to gravimetric determination; Always measure according to the GB/T7477-1987 method firmly.
Embodiment 1
Handle certain refinery's recirculated water sewer.The operational condition of catalyzed oxidation and flocculation is defined as: water inlet pH value is 5, catalyst sulfuric acid ferrous dosage is 300mg/L, and the clorox dosage is 80mg/L, and retention time of sewage is 40 minutes in the reactor, the pH of waste water is 7 in the flocculation basin, and the residence time is 30 minutes.Film processing system adopts " nanofiltration+reverse osmosis ".The water-quality guideline of sewage sees Table 1 before and after handling.By the data in the table 1 as can be seen, sewage after treatment, leading indicator satisfies the water quality requirement of recirculated water reuse.
Table 1 water quality data 1 of disposing of sewage
| Index | COD(mg/L) | Specific conductivity μ S | TDS(mg/L) | Total hard (mmol/L) |
| Sewage before handling | 110 | ?5800 | 2500 | 30 |
| Handle back sewage | 25 | ?50 | 40 | 0.1 |
Embodiment 2
Handle certain chemical plant recirculated water sewer.The operational condition of catalyzed oxidation and flocculation is defined as: water inlet pH value is 4, catalyst sulfuric acid ferrous dosage is 250mg/L, and the clorox dosage is 60mg/L, and retention time of sewage is 50 minutes in the reactor, the pH of waste water is 7.5 in the flocculation basin, and the residence time is 20 minutes.Film processing system adopts " nanofiltration+reverse osmosis ".The water-quality guideline of sewage sees Table 2 before and after handling.By the data in the table 2 as can be seen, sewage after treatment, leading indicator satisfies the water quality requirement of recirculated water reuse.
Table 2 water quality data 2 of disposing of sewage
| Index | COD(mg/L) | Specific conductivity μ S | TDS(mg/L) | Total hard (mmol/L) |
| Sewage before handling | 102 | 5600 | 2800 | 28 |
| Handle back sewage | 23 | 45 | 42 | 0.1 |
Embodiment 3
Handle certain electric power plant circulating water sewer.The operational condition of catalyzed oxidation and flocculation is defined as: water inlet pH value is 5, and catalyst sulfuric acid ferrous dosage is 200mg/L, H
2O
2Dosage is 50mg/L, and retention time of sewage is 45 minutes in the reactor, and the pH of waste water is 7 in the flocculation basin, and the residence time is 20 minutes.Film processing system adopts " ultrafiltration+reverse osmosis ".The water-quality guideline of sewage sees Table 3 before and after handling.By the data in the table 3 as can be seen, sewage after treatment, leading indicator satisfies the water quality requirement of recirculated water reuse.
Table 3 water quality data 3 of disposing of sewage
| Index | COD(mg/L) | Specific conductivity μ S | TDS(mg/L) | Total hard (mmol/L) |
| Sewage before handling | 104 | 5800 | 2700 | 25 |
| Handle back sewage | 24 | 48 | 40 | 0.1 |
Claims (14)
1. a recirculated water sewer is handled and recycling method, may further comprise the steps in order: adding oxidizing bactericide and catalyzer carry out chemical reaction in sewage, sewage after reaction finishes carries out flocculation sediment, sewage after flocculation sediment finishes enters the film system and handles, and the middle water after film disposes is back to use circulating water system.
2. in accordance with the method for claim 1, it is characterized in that adding acid or alkali are adjusted to the pH value less than 8 in pending recirculated water sewer.
3. in accordance with the method for claim 2, it is characterized in that adding acid or alkali in pending recirculated water sewer, to be adjusted to pH value be 1-7.
4. in accordance with the method for claim 1, it is characterized in that, the sewage pH value after having reacted is adjusted to greater than 6, carry out flocculation sediment again.
5. in accordance with the method for claim 1, it is characterized in that, the sewage pH value after having reacted is adjusted to 6-9.
6. in accordance with the method for claim 1, it is characterized in that described oxidizing bactericide is hypochlorite, hydrogen peroxide, ozone or persulphate.
7. in accordance with the method for claim 1, it is characterized in that described oxidizing bactericide is a clorox.
8. in accordance with the method for claim 1, it is characterized in that described catalyzer is also ortho states transition metal salt or a transition metal oxide of solubility.
9. in accordance with the method for claim 1, it is characterized in that described catalyzer is selected from Fe
2+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+And Zn
2+Vitriol, nitrate or muriate in one or more.
10. in accordance with the method for claim 1, it is characterized in that described catalyzer is a ferrous sulfate.
11. in accordance with the method for claim 1, it is characterized in that the dosage of oxidizing bactericide is 5-800mg/L, the dosage of catalyzer is 10-5000mg/L.
12. in accordance with the method for claim 1, it is characterized in that the dosage of oxidizing bactericide is 10-300mg/L, the dosage of catalyzer is 20-2000mg/L.
13. in accordance with the method for claim 1, it is characterized in that the dosage of oxidizing bactericide is 50-100mg/L, the dosage of catalyzer is 100-500mg/L.
14. in accordance with the method for claim 1, it is characterized in that said film processing system is a kind of in " ultrafiltration+reverse osmosis ", " nanofiltration+reverse osmosis ", " filtration+reverse osmosis " combination process.
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| CN2009102095359A CN102050533B (en) | 2009-10-29 | 2009-10-29 | Method for treating and recycling circulating water and sewage |
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Cited By (12)
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| CN102701487A (en) * | 2012-06-25 | 2012-10-03 | 杨德敏 | Method for treating sulfur-containing wastewater of oil and gas field |
| CN102745834A (en) * | 2011-08-02 | 2012-10-24 | 深圳城市诺必达节能环保有限公司 | Household reclaimed water treatment method and reutilization apparatus |
| CN103030227A (en) * | 2011-09-29 | 2013-04-10 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN103496819A (en) * | 2013-09-18 | 2014-01-08 | 苏州市阳澄湖现代农业产业园特种水产养殖有限公司 | Method for sterilization treatment on aquaculture wastewater |
| CN103818993A (en) * | 2014-02-17 | 2014-05-28 | 华南理工大学 | Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt |
| CN106517582A (en) * | 2016-11-25 | 2017-03-22 | 南宁市黑晶信息技术有限公司 | Method for treating printing and dyeing wastewater of pure wool textile fabrics |
| CN106587423A (en) * | 2016-12-02 | 2017-04-26 | 常州大学 | Method for preventing membrane pollution through ozone-coagulation joint pretreatment |
| CN107417015A (en) * | 2016-05-24 | 2017-12-01 | 中国石油化工股份有限公司 | A kind of oil gas field wastewater with high concentration of sulfide reduces standard discharge method |
| CN109534480A (en) * | 2018-12-14 | 2019-03-29 | 西能化工科技(上海)有限公司 | Reduce the processing method of reuse Organic substance in water |
| CN109534539A (en) * | 2018-11-27 | 2019-03-29 | 东南大学 | A kind of materialization group technology based on the processing of chlorella Ageing solution cycling and reutilization |
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|---|---|---|---|---|
| CN1075471C (en) * | 1996-07-12 | 2001-11-28 | 中石化总公司兰州化学工业公司 | Method for treating high concentration waste water difficult to be bio-oxidized |
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| CN102745834A (en) * | 2011-08-02 | 2012-10-24 | 深圳城市诺必达节能环保有限公司 | Household reclaimed water treatment method and reutilization apparatus |
| CN103030227A (en) * | 2011-09-29 | 2013-04-10 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN103030227B (en) * | 2011-09-29 | 2014-12-17 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN102701487B (en) * | 2012-06-25 | 2013-10-30 | 重庆地质矿产研究院 | Oil and gas field sulfur-containing wastewater treatment method |
| CN102701487A (en) * | 2012-06-25 | 2012-10-03 | 杨德敏 | Method for treating sulfur-containing wastewater of oil and gas field |
| CN103496819A (en) * | 2013-09-18 | 2014-01-08 | 苏州市阳澄湖现代农业产业园特种水产养殖有限公司 | Method for sterilization treatment on aquaculture wastewater |
| CN103818993A (en) * | 2014-02-17 | 2014-05-28 | 华南理工大学 | Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt |
| CN107417015B (en) * | 2016-05-24 | 2020-10-20 | 中国石油化工股份有限公司 | Method for emission of high-sulfur-content wastewater of oil and gas field by reducing injection and reaching standard |
| CN107417015A (en) * | 2016-05-24 | 2017-12-01 | 中国石油化工股份有限公司 | A kind of oil gas field wastewater with high concentration of sulfide reduces standard discharge method |
| CN106517582A (en) * | 2016-11-25 | 2017-03-22 | 南宁市黑晶信息技术有限公司 | Method for treating printing and dyeing wastewater of pure wool textile fabrics |
| CN106587423A (en) * | 2016-12-02 | 2017-04-26 | 常州大学 | Method for preventing membrane pollution through ozone-coagulation joint pretreatment |
| CN109534539A (en) * | 2018-11-27 | 2019-03-29 | 东南大学 | A kind of materialization group technology based on the processing of chlorella Ageing solution cycling and reutilization |
| CN109534539B (en) * | 2018-11-27 | 2022-03-04 | 东南大学 | Physicochemical combination process based on chlorella aging liquid recycling treatment |
| CN109534480A (en) * | 2018-12-14 | 2019-03-29 | 西能化工科技(上海)有限公司 | Reduce the processing method of reuse Organic substance in water |
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