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向经过曝气的高铁高锰深井地下水中加入生活污水以模拟微污染地下水,并考察了生物除铁除锰滤池对其的净化效果.滤柱高为2.7m,内径为60 mm,内装填除铁除锰能力已经成熟的锰砂,设计滤速为6 m/h.研究了去除有机物滤层的培养过程及在不同滤速下对各污染物的去除规律,结果表明:生物滤柱对微污染地下水具有良好的净化效果,其中,Fe的高效去除区间在滤层上部,Mn和有机物可以实现同层去除,高效去除区间在滤层中下部;当进水有机物浓度较高时,沿程的溶解氧浓度会逐渐降低,导致对CODMn和Mn的去除效果变差,此时应考虑在滤层中部或底部增加曝气来提高溶解氧. 相似文献
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持久性有机污染物农药研究进展 总被引:4,自引:0,他引:4
概述了持久性有机污染物农药的特性及其对人体健康与环境的危害.分析了我国持久性有机污染物农药研究现状、分析和处理技术以及环境风险评价研究的进展.介绍了国际上持久性有机污染物的大型区域性研究,并对我国持久性有机污染物控制对策提出了建议. 相似文献
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Ru改性的铁基钙钛矿体系的催化性能研究 总被引:3,自引:0,他引:3
为研究Ru改性的铁基钙钛矿体系的催化性能,用溶胶-凝胶法分别制备了不同x、y、n值的La1-xCexFe1-y-nCoy RunO3系列化合物,在模拟条件下,以起燃温度和气体转化效率为90%时的温度为评价指标测定了HC、CO及NOx的三效催化活性.研究表明:改性催化剂具有更高的催化活性和抗老化能力;Ru的引入可大幅度提高催化活性,且催化活性与Ru离子的掺杂量成正比;La0.8Ce0.2Fe0.7Co0.2Ru0.1O3样品的催化性能较佳,起燃温度分别可达到HC 295℃、CO 280℃,NOx 280℃. 相似文献
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To evaluate the removal efficiency of organic pollutants in the sewage by Harbin municipal sewage treatment plant,the influent and effluent samples from the plant were pretreated by liquid-liquid extraction (LLE) under conditions of acidity,neutrality and alkalescence in sequence,and then were analyzed by gas chromatograph-mass spectrum (GC-MS) procedures.Results indicate that there are 70 species of organic pollutants in the influent sample of the plant,which mainly consist of alkyls,benzene series,esters,and heterocyclic compounds.Some of these organic pollutants are biotoxic and belong to persistent organic pollutants (POPs).Four species among them are on the list of Prior Pollutants of Environmental Protection Agency of USA (USEPA).However,7 species of organic pollutants appearing in the effluent sample mainly include alkyls of multi-carbons and phthalate esters.The removal efficiency of phthalates is poor because of their poor biodegradability.The sewage treatment technique is effective in removing most of organics pollutants. 相似文献
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为了减轻由室内装修所造成的污染,通过生物滴滤处理装置处理室内装修烘烤后排出的挥发性有机气体(甲醛、苯、甲苯、二甲苯).在气体流量为600 L/h、表面液体速度为3.14~3.93 m/h,pH为6~7,进气温度为30℃条件下采用生物强化技术,当入口甲醛浓度小于30.86 mg/m3,生物滴滤塔对甲醛净化效率一直保持100%;当入口苯浓度在2.07~43.22 mg/m3,生物滴滤塔对苯的净化效率是86.2%~88.4%;当入口甲苯浓度在0.76~31.61 mg/m3,生物滴滤塔对甲苯净化效率是93.2%~94%;当入口二甲苯浓度在3~55.20 mg/m3,生物滴滤塔对二甲苯净化效率是90%~91.6%.从《大气污染物综合排放标准(GB16297-1996)》的指标考察,室内装修烘烤污染物经生物滴滤处理后均可达到现有污染源和新污染源排放标准,生物强化处理是可行的. 相似文献
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The compound nano-ZnO modified with Ce was prepared by homogeneous precipitation. IR, XRD and dynamic experiments show that the crystal size of nano-ZnO desulfurizer is decreased after being modified with Ce and its desulfurization activities are improved greatly. When calcined at 270 ℃, Ce distributes evenly on the ZnO particle surface as amorphous state oxides, and the amorphous ZnO · H2O also exists; when the calcining temperature is 570 ℃, the crystal CeO2 separates out and the amorphous structure of zinc oxide disappears, at the same time, the crystal is perfect and its size increases, but the desulfurization activities decrease. The desulfurization product of nano-ZnO modified with Ce was analyzed with XPS. The results show that the adsorption compound of HS, S and ZnS exists on the surface of the desulfurizer. 相似文献
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给水絮凝处理中壳聚糖的助凝作用和机理 总被引:2,自引:1,他引:1
为能高效除浊,又能去除水中有机污染物,将无机絮凝剂聚合氯化铝与天然高分子絮凝剂壳聚糖协同使用,用于自来水厂的给水絮凝处理.考察助凝剂壳聚糖投加量、pH、壳聚糖相对分子质量等因素对浑浊度和有机物去除效果的影响,采用微电泳仪测定了絮凝过程中溶液Zeta电位的变化,通过电子显微镜和im-ageJ图像处理软件,对絮体形态进行分析.结果表明,在以黄河水为水源的自来水厂的给水絮凝处理中,以壳聚糖(CTS)作为聚合氯化铝(PAC)的助凝剂,pH为7.5时,PAC投加35mg/L,CTS投加0.15mg/L时,壳聚糖的助凝效果显著.壳聚糖的絮凝以吸附架桥为主,电性中和为次.显微摄像系统絮体的形态分析表明,单加PAC、PAC/CTS协同絮凝处理水样后絮体的分形维数分别为1.294和1.385. 相似文献