Relation of lead adsorption on birnessites with different average oxidation states of manganese and release of Mn^2＋/H^＋/K^＋

The characteristics of Pb2+ adsorption on the surface of birnessites with different average oxidation states (AOS) of Mn, synthesized under acidic and alkali conditions, were investigated. The results indicated that the amount of adsorbed Pb2+ increased with the increase of Mn AOS in birnessites. The amount of Pb2+ adsorbed positively correlated with the amount of released Mn2+, H+, and K+ (r = 0.9962 > 0.6614, n = 14, α = 0.01). The released Mn2+, H+, and K+ were derived mostly from the corresponding catio...     

Decomposition and phosphorus release from four di erent size fractions of Microcystis spp. taken from Lake Taihu, China

Decomposition of Microcystis is accompanied by the release of phosphorus, during bacteria play an important role. A series of experiments were undertaken to evaluate the e ect of bacteria on the decomposition of Microcystis taken from Lake Taihu, China, a lake that is su ering from dense Microcystis blooms. The 16 experiments involved four size fractions of colonial Microcystis with or without the addition of lake sediment and Gram-negative bacterial inhibitor NaN3. The highest decomposition rates were recorded for the smallest size Microcystis fraction (< 25 m) with the addition of the sediment. The lowest decomposition rates were recorded for the smallest Microcystis fraction without the sediment, but with the addition of Gram-negative bacterial inhibitor NaN3. The higher decomposition rates in the treatments with NaN3 and sediment suggest that Gram-positive bacteria in the sediment are important for the decomposition process. Additionally, higher concentrations of total dissolved phosphorus (TDP) in the treatments with NaN3 suggest that more phosphorus accumulates in the Gram-negative bacterial cells around the colony, which may be an important source of phosphorus for Microcystis cells. In the no-sediment treatments, the ratios of TDP concentration to initial TP concentration were 64%–82%. The results of this experiment suggest that both Gram-negative and Gram-positive bacteria play an important role in the decomposition of Microcystis cells and the release of phosphorus from Microcystis colonies.     

压裂废液处理技术研究进展

综述了当前油气井作业中压裂废液处理的一些主要技术:氧化法、混凝法、Fe/C微电解法、多种处理技术联合使用等,从六个方面探讨了当前处理方法中存在的主要问题,指出了压裂废液处理技术的一个重要研究方向是优化压裂废液处理工艺,开发稳定可靠,高效价廉且无二次污染的压裂废液处理剂。     

侯马市环境空气状况探析

根据2006年以来的环境空气质量监测数据,对侯马市空气质量状况进行了月际浓度趋势和年际浓度趋势分析评价,指出了燃料燃烧、交通运输、城市建设、气象因素、外来污染等大气污染物的来源及特征,提出了深入治理煤烟污染、积极推广新能源使用、控制机动车尾气污染、加大治理城市扬尘污染、强化工业污染源治理等改善大气环境质量的对策建议。     

长庆油田质量安全环保巡察实践

质量安全环保巡察是长庆油田分公司QHSE管理体系的重要组成部分,是升级版的管理体系审核方式,在长庆油田已初见成效。推行“六个三”运行模式,坚持问题导向,紧盯问题突出单位、关键技术和管理岗位,深察管理渎职、监督失职、岗位失责和承包商失信等问题,突出风险管控、质量管理、承包商管理等方面,正向查落实,查压力传导、责任落实,逆向追责任,追溯问题根源,查找管理症结,准确追责问责,倒逼责任归位,达到持续改进QHSE管理的目的。     

公众参与环境执法角色关系探析

环境是公共的,环境利益具有公众性。在环境执法中积极吸纳公众意见,是国家民主管理社会的体现。公众参与环境执法的角色定位即：政府在环境执法中处于核心地位,拥有最终裁量权;企业是环境执法的对象;公众是环境执法的最终受益者。政府、企业与公众的沟通协调是公众参与环境执法的有效机制。     

水上溢油环境风险源确定研究

依据泄漏进水域的最大油品量、水域环境敏感性等两个主要因素,研究确定了江苏油田水上(临水)设施环境风险源等级,并针对不同的风险源阐述了降低风险等级的技术方法和预防措施,为加强江苏油田环境风险防患、提高应急处理能力提供了依据。     

以“生态足迹”的方法衡量青藏高原可持续发展能力

通过论述青海西藏两地环境质量总体向好的结论引证青藏高原生态盈余。用"生态足迹"和"人类发展指数"两种指标来衡量青藏高原的可持续发展能力,结果表明青藏高原有着较好的生态盈余,但人类发展指数值偏低,限制了青藏高原的可持续发展能力。应通过提高公共服务能力,加强生态系统管理,减少碳足迹来实现青藏高原的生态文明。     

地下水原位修复渗透性反应墙反应介质的改良与展望

渗透性反应墙(PRBs)是倍受关注的地下水原位修复技术之一,具有高效廉价、安装简便、维护简单等优点。详细总结了零价铁、活性炭、无机矿物材料和生物质材料等PRBs反应介质的结构、性能、适用范围、改良方法及增强吸附机制,介绍了PRBs技术在国内外地下水原位修复领域的工程应用实例,指出研发可再生型反应介质、深入研究复杂体系的污染物去除主导机制以及开展多介质混合、多种原位修复技术集成应用研究将是今后PRBs的主要研究方向。     

沈阳市区臭氧污染状况调查与分析

对沈阳市区环境空气中的臭氧污染现状进行了调查与分析,利用沈阳市大气自动监测系统的数据,分别分析了沈阳城市中心区和城市边缘区臭氧的污染情况以及臭氧与其他污染物之间的相关性,并总结了臭氧与其他污染物的季节性变化趋势。