生态环境学报
生態環境學報
생태배경학보
ECOLOGY AND ENVIRONMENT
2014年
8期
1327-1331
,共5页
Fenton法%聚合氯化铝%机械加工厂乳化液废水%预处理
Fenton法%聚閤氯化鋁%機械加工廠乳化液廢水%預處理
Fenton법%취합록화려%궤계가공엄유화액폐수%예처리
Fenton method%aluminium polychlorid%machinery processing factory emulsion wastewater%pretreatment
乳化液在机械制造、加工等过程中有广泛的应用,主要起润滑、冷却、表面清洗和防腐蚀作用。其主要成分为矿物油、表面活性剂、抑菌剂和其他有机添加剂,在使用过程中产生了高浓度、乳化严重、成分复杂且波动大的乳化液废水,随意排放会对环境造成严重污染;目前国内外对低浓度含油废水的处理进行了大量的研究工作,如各种破乳法、微生物法等,但各种处理方法都有其局限性,尤其对高浓度乳化液废水尚没有定型的处理方法。Fenton氧化法是一种高级氧化技术,在酸性条件下,H2O2被 Fe2+催化分解并产生大量具有强氧化性的?OH,通过?OH 氧化降解废水中的有机物,达到废水净化的目的。在处理有毒有害难生物降解有机废水方面具有较强的应用优势;聚合氯化铝(PAC)是一种应用很广的无机高分子絮凝剂,与其它水处理剂配合使用具有更好的水处理效果,通过 Al(Ⅲ)盐水解-聚合产物对水中胶体颗粒或胶体污染物进行电性中和、脱稳和吸附架桥作用生成粗颗粒絮凝体去除,从而达到净化污水的目的;本文采用Fenton法-聚合氯化铝组合工艺预处理机械加工厂高浓度乳化液废水以满足后续生化处理进水要求,通过实验研究了Fenton法涉及的初始反应pH值、H2O2投加量、硫酸亚铁投加量、反应时间和后续投加聚合氯化铝涉及的反应pH值、PAC投加量及反应时间对乳化液废水预处理效果的影响。结果表明,Fenton法处理乳化液废水的最佳反应条件为:pH值为2、H2O2投加量为48 mL·L-1、质量分数为10%的FeSO4投加量为88 mL·L-1和反应时间为60 min;后续投加PAC处理的最佳反应条件为:pH值为7、质量分数为10%的PAC投加量为466 mL·L-1、反应时间为40 min;乳化液废水COD约34000 mg·L-1,经Fenton法-聚合氯化铝组合工艺处理后处理水COD小于5000 mg·L-1,COD去除率达到87%以上,色度从浑浊的乳白色变成了清澈的无色,满足了后续生化处理对进水的水质要求。可为解决同类高浓度乳化液废水预处理提供技术参考。
乳化液在機械製造、加工等過程中有廣汎的應用,主要起潤滑、冷卻、錶麵清洗和防腐蝕作用。其主要成分為礦物油、錶麵活性劑、抑菌劑和其他有機添加劑,在使用過程中產生瞭高濃度、乳化嚴重、成分複雜且波動大的乳化液廢水,隨意排放會對環境造成嚴重汙染;目前國內外對低濃度含油廢水的處理進行瞭大量的研究工作,如各種破乳法、微生物法等,但各種處理方法都有其跼限性,尤其對高濃度乳化液廢水尚沒有定型的處理方法。Fenton氧化法是一種高級氧化技術,在痠性條件下,H2O2被 Fe2+催化分解併產生大量具有彊氧化性的?OH,通過?OH 氧化降解廢水中的有機物,達到廢水淨化的目的。在處理有毒有害難生物降解有機廢水方麵具有較彊的應用優勢;聚閤氯化鋁(PAC)是一種應用很廣的無機高分子絮凝劑,與其它水處理劑配閤使用具有更好的水處理效果,通過 Al(Ⅲ)鹽水解-聚閤產物對水中膠體顆粒或膠體汙染物進行電性中和、脫穩和吸附架橋作用生成粗顆粒絮凝體去除,從而達到淨化汙水的目的;本文採用Fenton法-聚閤氯化鋁組閤工藝預處理機械加工廠高濃度乳化液廢水以滿足後續生化處理進水要求,通過實驗研究瞭Fenton法涉及的初始反應pH值、H2O2投加量、硫痠亞鐵投加量、反應時間和後續投加聚閤氯化鋁涉及的反應pH值、PAC投加量及反應時間對乳化液廢水預處理效果的影響。結果錶明,Fenton法處理乳化液廢水的最佳反應條件為:pH值為2、H2O2投加量為48 mL·L-1、質量分數為10%的FeSO4投加量為88 mL·L-1和反應時間為60 min;後續投加PAC處理的最佳反應條件為:pH值為7、質量分數為10%的PAC投加量為466 mL·L-1、反應時間為40 min;乳化液廢水COD約34000 mg·L-1,經Fenton法-聚閤氯化鋁組閤工藝處理後處理水COD小于5000 mg·L-1,COD去除率達到87%以上,色度從渾濁的乳白色變成瞭清澈的無色,滿足瞭後續生化處理對進水的水質要求。可為解決同類高濃度乳化液廢水預處理提供技術參攷。
유화액재궤계제조、가공등과정중유엄범적응용,주요기윤활、냉각、표면청세화방부식작용。기주요성분위광물유、표면활성제、억균제화기타유궤첨가제,재사용과정중산생료고농도、유화엄중、성분복잡차파동대적유화액폐수,수의배방회대배경조성엄중오염;목전국내외대저농도함유폐수적처리진행료대량적연구공작,여각충파유법、미생물법등,단각충처리방법도유기국한성,우기대고농도유화액폐수상몰유정형적처리방법。Fenton양화법시일충고급양화기술,재산성조건하,H2O2피 Fe2+최화분해병산생대량구유강양화성적?OH,통과?OH 양화강해폐수중적유궤물,체도폐수정화적목적。재처리유독유해난생물강해유궤폐수방면구유교강적응용우세;취합록화려(PAC)시일충응용흔엄적무궤고분자서응제,여기타수처리제배합사용구유경호적수처리효과,통과 Al(Ⅲ)염수해-취합산물대수중효체과립혹효체오염물진행전성중화、탈은화흡부가교작용생성조과립서응체거제,종이체도정화오수적목적;본문채용Fenton법-취합록화려조합공예예처리궤계가공엄고농도유화액폐수이만족후속생화처리진수요구,통과실험연구료Fenton법섭급적초시반응pH치、H2O2투가량、류산아철투가량、반응시간화후속투가취합록화려섭급적반응pH치、PAC투가량급반응시간대유화액폐수예처리효과적영향。결과표명,Fenton법처리유화액폐수적최가반응조건위:pH치위2、H2O2투가량위48 mL·L-1、질량분수위10%적FeSO4투가량위88 mL·L-1화반응시간위60 min;후속투가PAC처리적최가반응조건위:pH치위7、질량분수위10%적PAC투가량위466 mL·L-1、반응시간위40 min;유화액폐수COD약34000 mg·L-1,경Fenton법-취합록화려조합공예처리후처리수COD소우5000 mg·L-1,COD거제솔체도87%이상,색도종혼탁적유백색변성료청철적무색,만족료후속생화처리대진수적수질요구。가위해결동류고농도유화액폐수예처리제공기술삼고。
Emulsion has received frequent usage in the proceeding of machine building and operation, for its role of lubrication, cooling, surface cleaning and corrosion prevention. The principal constituents are mineral oils, surface-active preparations, bacteria inhibitor and other organic additions. There is high concentration, over emulsification, complicated compositions and large fluctuation of emulsion wastewater during use. Willfully effluent would cause serious environment pollution. At present, there are lots of researches about the treatment of low concentration oily wastewater at home and abroad, such as emulsion breaking microbial catalyzing, and so on. However, all of these treatment methods have certain limitations, especially for the high concentration emulsion wastewater. Fenton method is an advanced oxide technique. Under the acidic conditions, H2O2 is catalytically decomposited and comes into lots of strong oxidizing ?OH, which can degrade the organic matters in wastewater to purificate wastewater. This method has strong predominance to treat hazardous, toxic and hard to biological degradation of organic wastewater. As PAC is a very useful inorganic polymeric flocculant, there will be better effects when it is used in conjunction with other water treatment chemicals. Through Al(Ⅲ) salt hydrolysis product to neutralize electricity and absorb the colloidal solid or colloidal pollutants to clean wastewater. In the paper, Fenton method - PAC was adopted to pretreat high concentration emulsified wastewater of mechanical plant to meet the water requirements of the subsequent biological treatment. The experiment studies the initial pH of reaction, H2O2 dosage, dosage of ferrous sulfate and reaction time involved in Fenton method, and the amount of follow-up PAC dosing, which involves the pH of reaction, PAC dosage and reaction time, and those effects on emulsified wastewater pretreatment. The results show that the optimal reaction conditions of Fenton treatment are as follows:pH value is 2, H2O2 dosage is 48 mL·L-1, 10%concentration FeSO4 dosage is 88 mL·L-1 and reaction time was 60 min;The optimal reaction conditions of subsequent addition of PAC are as follows:pH value is 7, 10%concentration PAC dosage is 466 mL·L-1, reaction time is 40 min, COD of treated water is less than 5 000 mg·L-1, removal rate of COD is more than 87%. The color of water becomes clear colorless from the opacity of the milky white. Fenton method-PAC really meets water quality requirements of the subsequent biological treatment.