Cooperative analysis of infrastructure perfection and residents’ living standards in poverty-stricken counties in Qinghai Province

Environment, Development and Sustainability - The western region of China has always been the main battlefield for poverty alleviation. It is essential to explore the interaction mechanism between...     

Studies on catalytic reduction of nitrate in groundwater

Catalytic reduction of nitrate in groundwater by sodium formate over the catalyst was investigated. Pd-Cu/γ-Al₂O₃ catalyst was prepared by impregnation and characterized by brunauer-emmett-teller (BET), inductive coupled plasma (ICP), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX). It was found that total nitrogen was effectively removed from the nitrate solution (100 mg/L) and the removal efficiency was 87%. The catalytic activity was affected by pH, catalyst amount used, concentration of sodium formate, and initial concentration of nitrate. As sodium formate was used as reductant, precise control in the initial pH was needed. Excessively high or low initial pH (7.0 or 3.0) reduced catalytic activity. At initial pH of 4.5, catalytic activity was enhanced by reducing the amount of catalyst, while concentrations of sodium formate increased with a considerable decrease in N₂ selectivity. In which case, catalytic reduction followed the first order kinetics. Translated from Acta Scientiae Circumstantiae, 2006, 26(4): 567–571 [译自: 环境科学学报]     

炼油污水达标排放存在问题与对策

针对洛阳石化总厂炼油污水影响达标的主要因素，进行了简要分析，并就解决COD、氨氮、悬浮物等问题的对策，提出了建议。     

混凝法处理搪瓷废水工艺研究

在试验的基础上,采用加碱混凝沉淀法,处理搪瓷废水,得到很好效果.通过生产规模运行证明,在进水COD_(cr)为1364.3mg/l,油类为25mg/1,BOD_5为374.8mg/l时,出水COD_(cr)为34.8mg/l,油相似文献   

适宜国内现状的生态工业园建设的初探

生态工业园是实现可持续发展的途径之一.根据当前中国国内工业布局、土地资源现状,并结合各种类型生态工业园特征,指出对现有企业和工业园区的改造,以及构建虚拟型生态工业园,是适宜当前中国国内现状的生态工业园建设类型.     

隔油池污泥脱水处理工艺研究

通过对隔油池污泥（浮渣和底泥）性质的分析，系统探讨了离心脱水机械用于该泥的可行性，提出了温度、转数、分离时间等最佳操作参数．小试及中试研究表明，用离心方法完全可以实现油、水、渣三相分离，分离得到的污油具有很好的回收利用价值。     

腐殖酸与稀土元素的作用及体系稳定性

 用稀土元素（La³⁺，Ce³⁺，Ho³⁺，Yb³⁺）标准溶液对湖泊沉积物腐殖酸进行非连续滴定，研究二者之间的络合反应能力及其结合产物在水溶液体系的稳定性。结果表明，腐殖酸结构中的活性点位在与三价稀土离子作用时表现出两种不同类型，在机制上采取两级络合反应。体系中沉淀生成与否主要取决于腐殖酸对稀土离子的容纳能力。     

脱硫石膏农业利用研究进展与展望

概述火电厂脱硫石膏定义、生产过程和性质.简述了脱离石膏的工业利用,详述了脱离石膏对酸性和碱性土壤改良的现状和机理,并展望了脱硫石膏促进滩涂土植被演替的前景.     

活性矸对硫、氟、铬阴离子吸附的研究

本文对活性矸-硫、活性矸-氟、活性矸-铬(Ⅵ)三种吸附系统进行了研究.结果表明:活性矸静态等温吸附符合Freundlich吸附等温式;静态吸附动力学可用Bangharm吸附速率方程描述;利用Body公式可确定活性析矸-氟吸附系统的液相有效扩散系数.     

鱼体内EROD活性对多氯联苯类的指示作用

运用鱼体肝脏中的EROD(7 ethoxyresorufin O deethylase)活性作为生态标记物 ,来指示大连近海部分水域的多氯联苯 (PCBs)类物质的污染状况。结果表明鱼体肝脏内的EROD活性可被PCBs诱导 ,导致活性异常增高 ,并与环境中特定污染物浓度之间存在着定量响应关系 ,EROD的这个特性可以用来评估海洋生态环境健康并作为预警指标。我们选取大连近海水域部分具有代表性的站位 ,分析测定其鱼样中EROD活性 ,并结合环境化学指标进行综合分析 ,证明将EROD作为指示多氯联苯类污染物的生态标记物是切实可行的 ,该方法在海洋环境监测中具有实际应用价值。