共查询到19条相似文献,搜索用时 109 毫秒
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在电镀加工过程中会产生重金属含量较高的废水,这部分废水如果直接排入河道或者是湖泊,会对生态环境产生巨大的危害。因此,含重金属电镀废水的治理工作非常重要,需要加大相关部门的监督管理力度,严格控制电镀废水中重金属的含量,对违规排放的企业要予以相关的处罚措施,切实做好含重金属电镀废水的处理工作。 相似文献
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张国明 《辽宁城乡环境科技》1998,18(2):54-55
1前言电镀废水中的铬主要来自电镀车间的镀槽及钝化槽的洗涤废水。废水的含铬量变化很大,以铬酸根CrO42-和重铬酸根Cr2O72-两种形式存在。饮用含Cr6+产的水可引起人体内部组织的损坏,C产毒性比Cr3+高100倍,长期经消化道摄人的铬盐,可致癌。铬盐还能抑制水体的自净作用;用含铬的水灌溉农作物,铬可富集于果实中,危害人类健康。因此,电镀废水必须经过治理后排放或循环使用,避免对人类及生存环境造成危害。针对电镀废水间歇排放,水质、水量波动大的特点,沈阳七二四厂对铁法矿务局供电部公司电镀厂电镀废水采用l;bS0a-viauH法处… 相似文献
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前言清除有害物质是治理金属表面处理废水的首要问题。氰的氧化处理及铬的还原处理比重金属渣的处理被重视。但是,要施行像现在这样严格的重金属排放规定,既使是把氰氧化、把铬还原处理了的电镀废水也决不许只调节废水的 PH 值就排放,必须使废水中的重金属污泥充分沉淀后才可排放。这个污泥的生成量非常之大,而且其处理存在着各种问题,不能简单处理。因此如何控制废水的排放量和减少废水中重金属的含量是处理电镀废水的一个关键问题。本文首先概要介绍各种废水量的控制方法,接着介绍对过去的处理方法做了一些改进而 相似文献
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电镀废水处理技术的研究进展 总被引:1,自引:0,他引:1
随着经济发展和人民生活水平的提高,电镀产品的需求与日剧增,而电镀废水中含有大量的重金属等污染物质,如果不加以处理,任意排放,势必对环境及人类产生严重危害,因此,研究电镀废水的处理是一个热点问题.本文介绍了现有的一些电镀废水处理的主要技术和研究进展,阐述了电镀废水的不同处理工艺的特点,为电镀废水处理技术的选择提供了参考依据. 相似文献
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电镀重金属废水处理技术的研究进展 总被引:1,自引:0,他引:1
电镀废水成分复杂,含有铬、铜、锌、镉、镍等多种重金属,处理难度较大。介绍了当前电镀废水处理技术及新进展,分析了各方法的优缺点,并对发展趋势进行展望。 相似文献
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针对电镀有机废水COD浓度高、可生化性差等特点,选取广东深圳某工业园区电镀厂的除油废水(ρ(COD)为2 000~2 500 mg/L,pH=13.1~13.5),采用Fenton法进行预处理,探索了H_2O_2投加量、n(H_2O_2)/n(Fe~(2+))、pH及反应时间对COD和BOD_5的去除效果,得到的最佳Fenton工艺参数为:H_2O_2投加量=15 00 mg/L,n(H_2O_2)/n(Fe~(2+))=4∶1,pH=3,反应时间=30 min。在此条件下,COD去除率可达到89.76%,同时B/C从0.19提高到0.31,有机废水的可生化性大幅提高,能达到可生化处理的基本要求。采用Fenton法对电镀有机废水进行预处理是可行的。 相似文献
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Field studies were conducted to investigate the advanced treatment of the municipal secondary effluent and a subsequent artificial groundwater recharge at Gaobeidian Wastewater Treatment Plant, Beijing. To improve the secondary effluent quality, the combined process of powdered activated carbon adsorption, flocculation and rapid sand filtration was applied, which could remove about 400 dissolved organic carbon (DOC) and 70% adsorbable organic halogens. The results of liquid size exclusion chromatography indicate that in the adsorption unit the removed organic fraction was mainly low molecular weight compounds. The fractions removed by the flocculation unit were polysaccharides and high molecular weight compounds. The retention of water in summer in the open recharge basins resulted in a growth of algae. Consequently, DOC increased in the polysaccharide and high molecular weight humic substances fraction. The majority of the DOC removal during soil passage took place in the unsaturated area. A limited reduction of DOC was observed in the aquifer zone. 相似文献
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Electrochemical oxidation of polyethylene glycol (PEG) in an acidic(pH 0.18 to 0.42) and high ionic strength electroplating solution was investigated. The electroplating solution is a major source of wastewater in the printing wiring board industry. A paraffin composite copper hexacyanoferrate modified(PCCHM) electrode was used as the anode and a bare graphite electrode was used as the cathode. The changes in PEG and total organic carbon (TOC) concentrations during the course of the reaction were monitored. The efficiency of the PCCHM anode was compared with bare graphite anode and it was found that the former showed significant electrocatalytic property for PEG and TOC removal. Chlorides present in the solution were found to contribute significantly in the overall organic removal process. Short chain organic compounds like acetic acid, oxalic acid, formic acid and ethylene glycol formed during electrolysis were identified by HPLC method. Anode surface area and applied current density were found to influence the electro-oxidation process, in which the former was found to be dominating. Investigations of the kinetics for the present electrochemical reaction suggested that the two stage first-order kinetic model provides a much better representation of the overall mechanism of the process if compared to the generalized kinetic model. 相似文献
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为提高电镀废水的污染物去除效率,探讨厌氧-缺氧-好氧(AAO)-生物膜耦合工艺的有机物去除和脱氮除磷效能。结果表明:AAO-生物膜工艺处理电镀难降解有机废水运行效果良好,COD去除率稳定在89%左右;脱氮主要途径是好氧硝化,缺氧反硝化,60 d运行中系统脱氮率达到70%~80%;难降解有机物影响NH4+-N和COD的去除效率,且存在时间差距,在其影响下,NH4+-N的变化稍滞后于COD。AAO-生物膜工艺的除磷效果经50 d运行后趋于稳定,出水TP浓度低于1 mg/L,去除率>65%,除磷主要依靠厌氧释磷和好氧吸磷过程。 相似文献
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采用文献调研法比较评价了膜生物反应器与传统生物工艺对垃圾渗滤液的处理效果。结果表明,渗滤液的水质特征(主要指COD)主要由渗滤液年龄决定,B/C值和渗滤液年龄对COD去除有重要影响。传统生物处理常采用多级组合工艺,渗滤液特性、工艺单元数、水力停留时间和有机负荷率等是影响COD去除的重要参数。近年来,MBR工艺的应用日益广泛,对于B/C值较低的老龄渗滤液,MBR工艺可获得更好的COD去除效果,也有利于废水的膜深度处理。 相似文献