排序方式: 共有72条查询结果,搜索用时 15 毫秒
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在煤矿生活污水深度处理的混凝处理前,投加高锰酸钾复合药剂(PPC)预处理,研究了PPC的对混凝处理的强化效应。实验结果表明:PPC预处理对煤矿生活污水深度处理的混凝处理具有很好的强化效应,能显著提高聚合氯化铝(PAC)的对CODMn和浊度的去除率;当PPC的投加量为4 mg/L时,CODMn和浊度的去除率分别提高21%和40%。 相似文献
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化工产业是天津滨海新区重要的支柱产业,该行业废水是滨海污染物控制的主要威胁。针对常规单一方法存在的问题,试验选取滨海某化工区实际废水从内电解-Fenton、内电解-混凝、内电解-超声及微波强化氧化-光催化4种耦合去毒预处理工艺进行了研究。试验表明,与传统方法相比,内电解-Fenton法中H2O2的加入增加了污染物的降解途径,提高了对污染物的去除效率;内电解-混凝法对于制药废水的生物毒性有比较好的去除作用,不加PAM或Ca(OH)2的效果更佳;内电解-超声法对制药废水的生物毒性去除率可达92%,其可生化性提高45%;微波强化氧化-光催化法对大多数难降解物质有效,而对酚类物质降解效果不佳。 相似文献
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A combined treatment technique consisting of enzymatic hydrolysis, followed by aerobic biological oxidation was investigated for the treatment of alcohol distillery spent wash. The enzyme cellulase was used for the pretreatment step with an intention of transforming the complex and large pollutant molecules into simpler biologically assimilable smaller molecules. Batch experiments were performed in order to analyze the influence of various parameters like pretreatment time, enzyme concentration and pH during the pretreatment step on the subsequent aerobic oxidation kinetics. The rate of aerobic oxidation was enhanced by 2.3 fold for the pretreated sample as compared to the untreated sample when the pH during the pretreatment step was maintained at a value of 4.8. Similarly, a two fold increase in the aerobic oxidation rate was found when the effluent was pretreated with the enzyme, without any pH control (i.e. effluent pH of 3,8). The study indicated that the enzymatic pretreatment of the effluent could be one of the successful pretreatments which can lead to enhancement of the rate of the subsequent aerobic oxidation. 相似文献
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不锈钢毛虽然用作阴极氧还原产电生物反应栅(CORE—PRB)的电极材料虽然有很多优点,但是反应电流较小。尝试对不锈钢毛进行酸蚀处理后用作电极材料,并分别研究比较了4种不同电极组合的产电反应性能。酸蚀处理显著提高不锈钢毛阳极的反应性能,并对提高不锈钢毛阴极的反应性能有一定作用。酸蚀的作用主要是使不锈钢毛表面变得粗糙,有利于提高电极表面积和材料的生物亲和性。虽然生物产电反应对COD降解的直接贡献不到10%,但是不同电极组合下COD的去除率与它们生物产电反应的贡献率呈现高度正相关性。 相似文献
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Cigdem Y. Gomec Esra Erdim Ilknur Turan Ali F. Aydin Izzet Ozturk 《Journal of environmental science and health. Part. B》2013,48(6):741-747
In this study, the applicability of physico-chemical methods was investigated for the pre-treatment of the olive mill effluents prior to the discharge into the common sewerage ending with a municipal wastewater treatment plant. The samples were taken from an olive oil industry operated as three-phase process located in Turkey. Various pre-treatment methods including acid craking, polyelectrolyte and lime additions were applied. Advanced oxidation study using Fenton's process was also investigated following pre-treatment by acid cracking and cationic polyelectrolyte. Acid cracking alone gave satisfactory treatment efficiencies and polyelectrolite additions to the acid-cracked samples enhanced treatment efficiency. Since a complete treatment plant is available at the end of the sewer system, results indicated that the effluents of the investigated industry could be discharged into the municipal sewerage in the case of total chemical oxygen demand (CODtot), suspended solid (SS) and volatile suspended solid (VSS) concentrations according to the Turkish Water Pollution Control Regulation after pre-treatment with 5 ppm anionic polyelectrolyte following acid cracking. The minimum CODtot, SS and VSS removals were observed when raw wastewater was pre-treated with lime and the discharge standards to the municipal sewer system could not be met. Advanced oxidation with Fenton's process was applied after acid cracking and cationic polyelectrolyte treatment in order to investigate further reduction in chemical oxygen demand (COD) concentration for minimizing the influence of this industrial discharge on the existing municipal wastewater treatment plant. Results indicated that CODtot removal increased up to 89% from 74% after Fenton's oxidation for the acid cracked samples in which cationic polyelectrolite (10 ppm) was added. 相似文献
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为了探究氧化与还原预处理对氧化-还原联合技术修复硝基苯污染地下水的影响,选取2,4-DNT(2,4-二硝基甲苯)为研究对象,构建过硫酸盐/铁炭修复技术体系,分别设置2个试验槽,一个试验槽以过硫酸盐作为氧化预处理联合以铁炭作为还原后处理,另一个试验槽以铁炭作为还原预处理联合以过硫酸盐作为氧化后处理,对比研究构建的氧化-还原联合系统中不同氧化与还原预处理方式对2,4-DNT去除机制的影响.结果表明:①过硫酸盐氧化材料填充位置显著影响试验槽pH和ORP(氧化还原电位)的变化,在运行周期5 PV(PV为孔隙体积,1 PV时间约为4 h)内,pH可显著增至11左右,ORP值达到最高.②在运行周期5 PV内,氧化填充层S2O82-浓度和还原填充层Fe2+浓度均显著降低.③在运行周期5 PV内,随运行周期的增加,以过硫酸盐作为氧化预处理联合以铁炭作为还原后处理的协同技术体系对2,4-DNT的去除效果显著降低,以铁炭作为还原预处理联合以过硫酸盐作为氧化后处理的协同技术体系对2,4-DNT的去除率维持在100%.④通过液相-质谱联用技术,识别构建的氧化-还原联合技术体系内2,4-DNT降解的主要中间产物,同时结合铁炭微电解还原机制和过硫酸盐氧化机制提出了2,4-DNT协同处理机制及其可能的降解路径.研究显示,还原预处理更有利于氧化-还原联合技术对地下水中2,4-DNT的去除,可为有效处理硝基苯化合物污染地下水提供理论支撑. 相似文献
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In this study, landfill leachate with and without pre-treatment was co-treated with municipal wastewater at different mixing ratios. The leachate pre-treatment was achieved by air stripping to removal ammonia. The objective of this study was to investigate the effect of landfill leachate on nutrient removal of the wastewater treatment process. It was demonstrated that when landfill leachate was co-treated with municipal wastewater, the high ammonia concentration in the leachate did not have a negative impact on the nitrification. The system was able to adapt to the environment and was able to improve nitrification capacity. The readily biodegradable portion of chemical oxygen demand (COD) in the leachate was utilized by the system to improve phosphorus and nitrate removal. However, this portion was small and majority of the COD ended up in the effluent thereby decreased the quality of the effluent. The study showed that the 2.5% mixing ratio of leachate with wastewater improved the overall biological nutrient removal process of the system without compromising the COD removal efficiency. 相似文献
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