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121.
甲烷是仅次于二氧化碳的重要温室气体,甲烷排入大气而引起气候异常以及对臭氧层的破坏,已经成为全世界共同面临的重大问题。矿井乏风是最大的甲烷工业排放源,收集和利用煤矿乏风瓦斯,减少温室气体排放,是我国面临的紧迫任务。本文根据近几年从事矿井乏风处理项目环评工作经验,对目前煤矿所采用的乏风氧化处理方法进行了探讨,并对乏风处理后带来的环境效益进行了阐述。 相似文献
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系统地论述了膜生物反应器的反应特征、去除机理,及其在港口污水中水回用处理应用的可行性。结果表明,膜生物接触氧化法用于港口污水处理,具有出水水质稳定、占地面积少、去除效率高等特点。经预处理后的港口污水再行由膜生物接触氧化反应器处理后可直接用作回用水。 相似文献
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叙述水热氧化法的基本原理和研究进展,并重点介绍在高浓度乳化废水、含酚废水、含油污水和废碱液的处理中,最新试验研究以及它的优缺点和发展前景。 相似文献
127.
Guohong Qiu Yao Luo Cheng Chen Qiang Lv Wenfeng Tan Fan Liu Chengshuai Liu 《环境科学学报(英文版)》2016,28(7):164-176
The oxidation of exposed pyrite causes acid mine drainage, soil acidification, and the release of toxic metal ions. As the important abiotic oxidants in supergene environments, oxygen and manganese oxides participate in the oxidation of pyrite. In this work, the oxidation processes of natural pyrite by oxygen and birnessite were studied in simulated systems, and the influence of pH, Fe(II) and Cr(III) on the intermediates and redox rate was investigated. SO42 − and elemental S were formed as the major and minor products, respectively, during the oxidation processes. Ferric (hydr) oxides including Fe(OH)3 and goethite were formed with low degree of crystallinity. Low pH and long-term reaction facilitated the formation of goethite and ferric hydroxide, respectively. The rate of pyrite oxidation by birnessite was enhanced in the presence of air (oxygen), and Fe(II) ions played a key role in the redox process. The addition of Fe(II) ions to the reaction system significantly enhanced the oxidation rate of pyrite; however, the presence of Cr(III) ions remarkably decreased the pyrite oxidation rate in aqueous systems. The introduction of Fe(II) ions to form a Fe(III)/Fe(II) redox couple facilitated the electron transfer and accelerated the oxidation rate of pyrite. The present work suggests that isolation from air and decreasing the concentration of Fe(II) ions in aqueous solutions might be effective strategies to reduce the oxidation rate of pyrite in mining soils. 相似文献
128.
测定了几种工业废水的可生化性指标BOD5/COD比值和相对耗氧速率,根据模拟生物氧化塘的动态运行试验结果,提出以耗氧速率(R%)作为可生化性的判定指标,它比BOD5/COD比值测定快速,方法简便,更接近实际,并得出两个指标与生物塘COD去除率之间相关性的线性回归方程,为选择废水生物塘处理方案、预估其对COD的去除效率提供了理论依据。 相似文献
129.
氧化塘深度处理焦化废水的初步研究 总被引:10,自引:0,他引:10
焦化废水经过常规的二级处理后,COD和NH3-N往往难到达到国家排放标准,以活性污泥法处理焦化废水的出水水质为依据,采用氧化塘深度处理焦化废水,其COD和NH3-N均可达到国家排放标准。因此,只要只要条件控制得当,运用氧化塘处理低浓度焦化废水可以获得较好处理效果。 相似文献
130.
Optimization of Fenton's oxidation of chemical laboratory wastewaters using the response surface methodology 总被引:6,自引:0,他引:6
Establishing a treatment process for practical and economic disposal of laboratory wastewaters has become an urgent environmental concern of the Department of Chemical Engineering of the Universidade Estadual de Maringá (State University of Maringá), Brazil. Fenton and related reactions are potentially useful oxidation processes for destroying toxic organic compounds in water. In these reactions, hydrogen peroxide is combined with ferrous or ferric iron in the presence or absence of light to generate hydroxyl radicals (.OH). The feasibility of Fenton's reagent to treat waste chemicals from an academic research laboratory was investigated in this study. A response surface methodology was applied to optimize the Fenton oxidation process conditions using chemical oxygen demand (COD) removal as the target parameter to optimize, and the reagent concentrations, as related to the initial concentration of organic matter in the effluent, and pH as the control factors to be optimized. Maximal COD removal (92.3%) was achieved when wastewater samples were treated at pH 4 in the presence of hydrogen peroxide and iron in the ratios [COD]:[H2O2]=1:9 and [H2O2]:[Fe2+]=4.5:1. Under these conditions, it was possible to obtain simultaneously maximal COD removal and minimal chemical sludge after treatment, which is a residue that needs further processing. 相似文献