地下水中铁、锰的存在形式及去除技术探讨

地下水中铁、锰存在形式复杂 ,铁锰超标产生一定的危害性 ,本文通过研究地下水除铁除锰技术的发展趋势 ,对现有除铁除锰技术进行比较 ,阐明了生物除铁除锰技术的发展前景     

Removal of hydrophobic volatile organic compounds with sodium hypochlorite and surfactant in a co-current rotating packed bed

A co-current flow rotating packed bed was applied to remove volatile organic compounds(VOCs) by sodium hypochlorite(Na Cl O) and surfactant(sodium dodecyl benzene sulfonate,SDBS) from air stream. Xylene was used as a model VOC herein. The effect of p H,concentration of Na Cl O and SDBS solution, liquid flow rate, gas flow rate and rotational speed on xylene removal efficiency and overall mass transfer coefficient(KGa) were discussed. Then, a correlation for KGa of the co-current rotating packed bed was proposed by fitting the experimental data of KGa and independent variables of liquid/gas ratio,rotational speed, p H, Na Cl O concentration and treatment time, which was in good agreement with the experimental data(the deviation ≤± 30%).     

化学沉淀法处理模拟含铜废水的研究

采用化学沉淀法对模拟含铜废水进行处理,分别考察了反应pH值、温度、沉淀时间、絮凝剂(PAM)用量以及PAM作用下沉淀时间等因素对模拟含铜废水处理的影响,并在最佳条件下对实际含铜废水进行了处理研究。结果表明,采用化学沉淀法处理200 mg/L的模拟含铜废水时,1‰聚丙烯酰胺(PAM)的最佳加入比例为30 mg/L,在25℃下,合适的pH值为7.12左右,沉淀时间13 min。在此条件下对来自葫芦岛锌厂的酸性平均含铜为167 mg/L的实际废水继续处理,处理后废水中铜离子浓度平均值为0.87 mg/L,可以实现实际废水中铜离子的有效去除。     

KHYC絮凝剂处理工业废水的探讨

文中详细地论述了KHYC型有机离分子絮凝剂对几种工业废水的处理效果，分析了影响絮凝效果的主要因素。试验结果表明：对于SS这一指标，无论何种废水，其去除率均在94％以上。但对于CODCr若是高浓度有机废水，其去除率仅在40％左右，尚需另设其它工艺作进一步处理。     

利用焦炭吸附进行燃煤烟气脱硫脱氮技术的研究

介绍一种干法烟气脱硫脱氮工艺方法 ,利用一种非常容易获得炭质吸附材料经过简单的工艺处理后 ,达到燃煤烟气脱硫脱氮效果 ,整个过程不产生二次污染     

污泥膨胀对MBR的影响试验研究

近年来,膜生物反应器(MBR)在废水处理领域得到了广泛的研究和应用,一般研究认为,膜的高效分离作用可以将微生物全部截留在反应器中,从而避免污泥膨胀对系统运行造成的不良影响。本文通过实验分析了膨胀污泥对MBR中污染物的去除效率。     

饮用水砷污染治理研究进展

简述了饮用水中砷污染的来源和危害,砷在水环境的存在形态和毒性,分析了当前饮用水不同除砷方法的研究进展。     

城市污水生物脱氮除磷工艺研究进展

本文阐述了城市污水生物脱氮除磷工艺的发展过程,系统介绍了国内外各种污水生物脱氮除磷工艺,并对其进行了比较分析,对今后的发展趋势作了展望.     

饮食业油烟净化设备技术性能的探讨

按照HJ/T62-2001的要求，通过没来回净化设备实验室检测系统，比较了国内4种饮食业油烟净化设备的去除效率，本体阻力等技术性能指标，并结合用户调查，对目前国内饮食业油烟治理技术的特点及局限性作了初步的探讨，结果表明，复合式净化设备油烟的去除效率较高，静电式净化设备的本体阻力较小，而湿式净化设备的维护较为简便。     

Evaluation of municipal wastewater treatment plants with different technologies at Las Rozas, Madrid (Spain)

Eight small-scale municipal wastewater treatment plants were evaluated over a period of 19 months in the suburb of Las Rozas in Madrid (Spain). Four plants used compact extended aeration, two used conventional activated sludge, two used conventional extended aeration, one used a rotary biodisc reactor and the other used a peat bed reactor. The best results were obtained from the plants that used conventional technologies and the biodisc. Conventional activated sludge and extended aeration had higher removal efficiencies for ammonia, TSS, COD and BOD(5) and produced good quality final effluents for final disposal in accordance with the discharge standard. Empirical equations that correlated the concentration of dissolved oxygen in the effluents with the efficiencies of TSS, ammonia, COD and BOD(5) removals for all plants evaluated were obtained. The performance of the plants using compact extended aeration was affected more than those using conventional technologies or rotary biodisc when the capacity exceeded that of its initial design.