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Dissolved organic matter (DOM) concentrations have been measured in the waters of a semiarid freshwater wetland, the Tablas de Daimiel, Spain, when the system-characterised by variable hydroperiodicity conditions, was completely flooded (February 2011). Fluxes of DOM from the wetland soils to the overlying waters were measured by using a passive diffusion sampler (peeper). Not only dissolved organic carbon (DOC) concentrations were measured but refractory organic matter (ROM, usually known as humic substances) was also quantified using a novel voltammetric method. Fluorescence spectra were recorded to help in selecting the appropriate standard for ROM quantification, test the homogeneity of DOM in the waters and get an indication of their source. The results obtained show a 7-fold increase in measured ROM concentrations from the Gigu¨ela River to the outlet, which points to a net exportation of ROM from the wetland and to the existence of an internal source of ROM in the system, probably diffusion from the wetland soils. This hypothesis is confirmed by the flux of ROM from the soils to the water column measured with the peeper and by the common fluorescence characteristics of column and interstitial waters. The smaller increase in DOC concentrations along the wetland, in spite of the higher DOC fluxes from soils, suggests that there is significant turnover of organic carbon (OC) in the water column. The system acts as a major carbon sink but, when flooded, exports OC as DOM.  相似文献
2.
电-Fenton法是一项新兴的废水处理技术,在水处理中的应用受到了越来越多的关注。综述了电-Fenton法的基本原理、基本类型、基本特点,以及对水体中的农药、染料、PPCPs、工业污染物等难降解有机污染物的去除应用的现状,同时也指出了该法的一些优点和目前的不足,提出电-Fenton法今后的发展趋势。  相似文献
3.
晚期渗滤液由于含有大量难降解有机物腐殖质,可生化性差,较难处理。采用特定分子量的超滤膜对晚期渗滤液中的腐殖质进行有效的分离,研究了膜分离腐殖质前后渗滤液的可生化性的变化:渗滤液中腐殖质类物质去除率为90.7%,BOD5/COD值提高了6倍,可生物降解的有机物在总有机物中所占比率提高了约4倍。结果表明,分离腐殖质可提高渗滤液的可生化性。  相似文献
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菌藻共生系统不仅能够吸收空气中的CO2,高效去除污水中的氮磷营养物质,而且能够有效去除重金属、抗生素等,因而在污水处理领域日益受到广泛的关注.本文从菌藻之间相互作用关系出发,介绍了用于污水处理时藻类选择的依据,及在污水处理中对N、P营养物质、抗生素、重金属等污染物的去除机理,综述了菌藻系统在污水处理中的应用进展,以期为菌藻共生系统在污水处理中的推广应用提供参考.  相似文献
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