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《净水技术》Vo1.23,No.2,2004,21~24近年来电化学法用于去除废水中有机污染物的研究不断增多,主要由于电化学法处理难降解的有机物具有很好的效果,它可以使非生化降解的有机物转化为可以生化降解的有机物,或使非生化降解的有机物燃烧生成CO2和H2O。本文综述了处理水中酚类的电化学方法的原理、反应速率的影响因素,并介 相似文献
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精细化工行业废水具有有机污染程度高、可生化性差、含醇高、含盐量高等特点。通过对南通某精细化工废水水质情况的实际考察,提出了具有针对性的废水处理工艺,即含醇高、含盐量的高浓度废水预处理分别采用蒸馏、蒸发冷凝等技术;综合废水采用UASB+水解酸化+PACT活性污泥好氧反应+二沉池技术。该工艺可实现对废水中难降解、溶解性有机污染物及特征污染物的有效去除,满足废水的达标排放。 相似文献
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中科院过程工程研究所采用电—生物耦合技术处理难被微生物降解的有机废水取得良好效果。最近该技术已申请国家发明专利。据介绍,硝基苯类、卤代烃、还原染料等都是重要的工业原料或产品,但它们都很难被微生物所降解。以前这类废水的处理一直是企业面临的一项难题。中科院过程工程研究所经过深入研究发明的电—生物耦合技术,利用电催化反应将水中难降解有机物催化还原成生物易降解的有机分子,之后通过生化工艺将它们彻底去除。 相似文献
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为了更有效地实现工业废水的"零排放",并且得到满足回用要求的高度净化回用水,研发了电化学紫外光联用耦合膜过滤技术对"零排放"工艺中双膜法当中的超滤或微滤预处理技术进行改良。结果发现,经过该工艺处理后的中水,其COD和UV;相比于单独膜过滤或电化学膜过滤工艺具有更高的去除率,且使用UVC作为电化学紫外光联用耦合膜过滤技术的光源处理废水时,水中COD的去除率相较于使用UVA紫外光光源的去除率更高。通过对不同处理时间三维荧光激发发射光谱图(EEM)的分析发现,被该技术所去除有机物的主要组分为腐殖质类物质以及蛋白质类物质,特别是腐殖质类组分的浓度显著降低。有机物的去除主要是由于电化学和紫外光联用可产生多种强氧化性自由基,从而降解废水中的有机污染物。 相似文献
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污水处理厂尾水中因可生物降解的有机物含量较低,无法实现生物深度脱氮,外排仍含有较高浓度的总氮,若排入河流会引起富营养化,因此深入研究尾水的深度脱氮技术具有重要意义。采用催化电氧化技术,以污水处理厂尾水为研究对象,研究了在电流密度、水力停留时间(HRT)、进水pH值等因素的影响下,尾水中总氮的去除。结果表明,催化电氧化技术在电流密度为32.67 mA·cm-2、进水pH值为6.25~7.02、HRT为30 min时,总氮(TN)从26.40 mg·L-1降至11.91 mg·L-1,NO3--N从18.03 mg·L-1降至4.90 mg·L-1,去除率分别可达到54.9%和72.8%;TN的脱除主要以硝氮(NO3--N)的去除为主。催化电氧化技术能高效去除污水厂尾水中的总氮,且具有运行稳定和抗冲击等优点。为污水处理厂尾水的电化学深度脱氮提供了理论基础。 相似文献
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Vapor recompression is considered a highly energy-efficient technology to recover the heat involved in a process. Unfortunately, in conventional vapor recompression technology, not all of the heat can be recovered effectively. In this study, an enhanced vapor recompression technology enabling more effective heat recovery is proposed, and its ability to dry low rank coal (LRC) is evaluated. We consider the factors of exergy recovery and heat coupling. In addition to conventional vapor recompression, enhanced vapor recompression technology used to dry LRC can recover effectively the sensible heat of dried solid LRC through water recirculation. Moreover, we show that there is an optimum amount of recirculated water for each initial and target moisture content. A temperature–enthalpy diagram reveals that the proposed enhanced vapor recompression technology shows effective heat coupling for each type of heat, which results in less exergy loss so that a marked reduction in energy consumption can be achieved. 相似文献
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This work deals with the ozonation of a chemical industry wastewater, which contains many complex organic pollutants and presents high chloride content and toxicity. Batch experiments were carried out until ozone absorption reached 0.1 to 3 gO3/L. Ozonation promoted low to moderate levels of organic matter removal even when high ozone doses were applied. Organic matter removal tended to decrease when chloride content increased. Toxicity removal increased with the ozone dose up to 0.5 gO3/L. High or complete toxicity removal was attained after ozonation of the wastewater samples. Ozonation was also very effective in removing the polycyclic aromatic compounds found in the wastewater. 相似文献
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Removal of residual organic matter from secondary effluent by iron oxides adsorption 总被引:3,自引:0,他引:3
Residual organic matter (ROM) removal is an important issue in wastewater reclamation and reuse processes. Use of iron oxide particles (IOPs) as adsorbents for further treatment of the secondary effluent was investigated to mainly remove non-biodegradable residual organic matter under various operating conditions. ROM removal by IOP adsorption was evaluated in terms of the changes of UV absorbance, COD, and DOC concentrations in feed (secondary effluent) and treated water. The respective relationship of UV removal with COD and DOC removal efficiencies exhibited somewhat different profiles, possibly due to the influence of ROM properties on adsorptive removal mechanisms by IOP, such as hydrophobicity and coordinative capability. The types of IOPs such as ferrihydrite, geothite, and hematite were compared, and it was found that amorphous ferrihydrite was most effective in ROM removal. Maximum ROM removal was occuring at a solution pH of approximately 6.0, which might be ascribed to the ability of ligand exchange related to the association and dissociation of ROM molecules and IOPs at differing pH levels. Substantial reduction in the oxidation state (OS) of the treated water at high ROM removal indicated the coordination of highly oxidized groups in ROM at the IOP surface, such as carboxylic groups. 相似文献
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厌氧氨氧化的发现使开发低能耗城市污水处理技术成为可能,可通过生物吸附实现污水能源与资源的回收。强化除磷系统污泥龄(SRT)仅为2 d,系统抗冲击性强,污泥沉降性良好,污泥体积指数(SVI)低于50,可为自养脱氮系统提供稳定的进水,但系统污泥碳含量仅为37%。将反应器内好氧水力停留时间(HRT)降至 40 min后,实现有机物去除序批式反应器(SBR)的稳定运行,厌氧段COD去除率占总COD去除率的93.8%,这表明系统对有机物的去除主要为生物吸附作用,同时污泥碳含量提升至48%。由于异养菌对有机物的消耗利用与除磷菌的吸磷过程同时进行,若试验废水C/P比较低,可降低系统水力停留时间、提升碳的回收率并辅助少量的化学除磷手段,对系统厌氧搅拌时间、曝气时间及污泥龄进行优化,从而实现C与P的高效回收。 相似文献
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水解酸化技术用于污泥减量与强化脱氮除磷 总被引:4,自引:0,他引:4
水解酸化工艺,可以使废水中有机大分子物质分解为小分子物质,目前主要被用于难生物降解的有机废水的预处理。综述了水解酸化的机理、影响因素及其在污泥减量化和强化脱氮除磷作用中的研究进展,并分析了水解酸化复合处理技术的研究前景。 相似文献
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目前水体富营养化情况相当严重,其主要原因是磷含量的增加,因此废水的除磷技术十分重要.反硝化除磷技术利用厌氧、缺氧交替的环境,通过反硝化聚磷菌的作用,同时完成过量吸磷和反硝化过程,应用前景广阔.简述了反硝化除磷技术的机理,介绍了单污泥系统反硝化除磷工艺(BCFS工艺)及双污泥系统反硝化除磷工艺(A2N工艺、DEPHANO... 相似文献