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351.
对武钢冷轧乳化液废水采用超滤和氧化破乳法进行对比试验,从试验运行效果、投资费用、运行成本等方面进行了比较分析,得出处理冷轧乳化液废水的最佳方法-超滤法。对冶金行业乳化液废水的处理具有一定的参考价值。 相似文献
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The degradation of polyacrylamide (PAM) in simulate wastewater was studied in UV/Fenton/C4H4O62? system. The factors such as molecular ratio of H2O2/Fe2+/C4H4O62?, pH, and the dosage of Fenton reagent that could affect the PAM degradation in the UV/Fenton/C4H4O62? system were investigated. The experimental results showed that adding C4H4O62? to UV/Fenton system could form photosensitive ferrous complexes, which led to higher degradation efficiency of PAM. The degradation rate of PAM could be up to 95.2% under the following conditions: the concentration of H2O2, Fe2+, and C4H4O62? were 22.5, 2.25, and 2.25 mmol/L, respectively (i.e., molecular ratio of H2O2/Fe2+/C4H4O62? was 10:1:1), the pH value was 3.0. 相似文献
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根据大港油田12井综合废水的污染特征,提出了"混凝-内电解-H2O2氧化"三步处理的方法。实验结果表明:三步法处理后可以使原水的CODcr从4930mg/L降低到128mg/L,去除率达到97%。处理后水质达到国家《污水综合排放标准》(GB8978-1996)二级标准要求。 相似文献
359.
On-farm water storages (locally known as farm dams or farm ponds) are an important part of many agricultural landscapes, as
they provide a reliable source of water for irrigation and stock. Although these waterbodies are artificially constructed
and morphologically simple, there is increasing interest in their potential role as habitat for native flora and fauna. In
this article, we present results from a case study which examined the habitat characteristics (such as water physical and
chemical parameters, benthic metabolism, and macrophyte cover) and the macrophyte and macroinvertebrate biodiversity of eight
farm ponds on four properties in the Stanley Catchment, Southeast Queensland, Australia. Each landowner was interviewed to
allow a comparison of the management of the ponds with measured habitat and biodiversity characteristics, and to understand
landowners’ motivations in making farm pond management decisions.
The physical and chemical water characteristics of the study ponds were comparable to the limited number of Australian farm
ponds described in published literature. Littoral zones supported forty-five macroinvertebrate families, with most belonging
to the orders Hemiptera, Coleoptera, Odonata, and Diptera. Invertebrate community composition was strongly influenced by littoral
zone macrophyte structure, with significant differences between ponds with high macrophyte cover compared to those with bare
littoral zones. The importance of littoral zone macrophytes was also suggested by a significant positive relationship between
invertebrate taxonomic richness and macrophyte cover.
The landowners in this study demonstrated sound ecological knowledge of their farm ponds, but many had not previously acknowledged
them as having high habitat value for native flora and fauna. If managed for aquatic organisms as well as reliable water sources,
these artificial habitats may help to maintain regional biodiversity, particularly given the large number of farm ponds across
the landscape. 相似文献
360.
The effluents of wastewater treatment plants, usually directly emitted to the environment, often contain the anti-inflammatory drug diclofenac (DCF). The paper investigates DCF elimination using irradiation technology. Hydroxyl radical and hydrated electron reactive intermediates resulting from water radiolysis effectively degrade DCF and strongly reduce the toxicity of the solutions. OH attaches to one of the rings of DCF, and hydroxylated molecules, 2,6-dichloroaniline and quinoid type compounds are the products. Hydrated electron adds to the chlorine atom containing ring, in the reaction quinoid type compounds and 4-chloroacridine form. At a 0.1 mM DCF concentration, a ∼1 kGy absorbed dose is needed for the degradation of DCF molecules, but for mineralization of the products (in presence of O2) an order of magnitude higher dose is required.For irradiation of wastewater after biological treatment a ∼1 kGy dose is suggested. At this dose DCF and other drugs or metabolites present at μg L−1 level are eliminated together with microorganism deactivation. 相似文献