Influence of nitrate concentration on carbon tetrachloride transformation by a denitrifying microbial consortium

A denitrifying consortium capable of transforming carbon tetrachloride (CCl₄) was cultured from an aquifer soil isolated sample from the DOE Hanford Site in southeastern Washington State. Experiments were performed to determine the effects of nitrate concentration on CCl₄ transformation by these microbes. The microorganisms were cultured under two different experimental conditions, both of which gave similar cell growth. Under conditions where both the electron donor (acetate) and electron acceptor (nitrate) were present at all times, little CCl₄ transformation was observed. However, transformation was observed if the nitrate concentration was reduced to a level where it was periodically depleted. These results are discussed in relation to the design of an in situ bioremediation system.     

Remediation of phenol-contaminated soil by a bacterial consortium and Acinetobacter calcoaceticus isolated from an industrial wastewater treatment plant

Time-course performance of a phenol-degrading indigenous bacterial consortium, and of Acinetobacter calcoaceticus var. anitratus, isolated from an industrial coal wastewater treatment plant was evaluated. This bacterial consortium was able to survive in the presence of phenol concentrations as high as 1200mgL(-1) and the consortium was more fast in degrading phenol than a pure culture of the A. calcoaceticus strain. In a batch system, 86% of phenol biodegradation occurred in around 30h at pH 6.0, while at pH 3.0, 95.2% of phenol biodegradation occurred in 8h. A high phenol biodegradation (above 95%) by the mixed culture in a bioreactor was obtained in both continuous and batch systems, but when test was carried out in coke gasification wastewater, no biodegradation was observed after 10 days at pH 9-11 for both pure strain or the isolated consortium. An activated sludge with the same bacterial consortium characterized above was mixed with a textile sludge-contaminated soil with a phenol concentration of 19.48mgkg(-1). After 20 days of bioaugmentation, the remanescent phenol concentration of the sludge-soil matrix was 1.13mgkg(-1).     

生物菌剂修复陕北石油污染土壤实验研究

对陕北石油污染土壤分离得到的优势菌进行生态环境因素影响实验研究.实验表明,投加优势菌种的土壤中石油降解率明显高于不加菌土壤,这说明实验室分离出的优势菌剂对陕北石油污染土壤修复效果显著;而同时翻耕可进一步提高微生物的降解效率,加菌翻耕土壤中石油的降解率在42d达到了96.62%.并且微生物在较低温度下仍保持显著的降解效果.添加不同膨松剂的实验结果显示,在供试土样中添加麦皮效果最好,降解率达到87.96%,其次为稻壳,降解率达到71.19%,添加锯末效果最差,降解率仅为38.98%.     

利用基因工程菌修复富营养化水体

以徐州市黄河故道应用基因工程菌修复富营养化水体为研究对象，对水体中富营养化指标进行了测定，并对水体中生物生长变化情况进行了观察，试验和分析了基因工程菌中的消氮细菌及沉淀细菌对水体进行生物修复的作用及其效果，指出了存在的问题，为利用生物修复技术处理天然湖泊的富营养化提供了参考数据．     

城区内河水环境的生物治理——以池州市清溪河为例

对清溪河污染的治理,可以采用一系列理化的方法,但相比之下,利用生物治理不仅操作简便,成本低廉,而且能很好的修复水生生态系统的结构,达到良性循环的效果。驳岸的植物是一道屏障,能有效阻止和减少地表污染物进入水体,水中微生物将有机态的污染物转化为无机养份被植物吸收,植物为水中的微生物提供附着表面,而草食性鱼类能抑制植物的过渡生长,最终实现生态系统的重建与修复,使河道进入可持续发展的良性循环体系。     

污染环境中微生物修复的几种办法

着重对微生物在环境治理中的应用的条件、修复的类型、修复的方法、工程应用实例等方面进行了讨论，对微生物在环境修复中的作用进行了总体概括。     

地下水有机污染的天然生物恢复综述

天然恢复是一种污染羽管理策略, 天然生物降解则是其中最重要的作用． 从天然生物恢复概念入手, 总结了有机污染物在地下的存在形式及生物降解机理． 引用两个实例说明了天然生物恢复作用的存在性． 认为地下水有机污染的广泛性与严重性给有关的研究者提出了严峻的挑战．     

土壤的石油污染研究进展

当今土壤的石油污染是一种较为普遍的现象。土壤石油污染的治理是学术界研究的热点领域，从石油污染的微生物降解。在土壤中的吸附，解吸与迁移。对作物的影响及生物修复方面介绍了国内外的有关研究现状及其发展趋势。     

细菌诱导矿化保护历史建筑遗产的机理及效果

为了研究细菌诱导碳酸钙在大理石、混凝土基材表层矿化沉积形成的人工层对基材加固保护的机理及性能,用X射线衍射、扫描电镜、压汞仪及超声波研究分析了矿化晶体物相,矿化层生长,沉积晶体对基材孔隙的影响以及矿化层黏结与保护效果.结果表明:矿化晶体为方解石和球文石;Ca2+源影响碳酸钙矿化沉积晶相,细菌在晶体矿化沉积过程中充当成核位点,且晶体均匀生长在基材表面;沉积致使试样孔隙率减少,但对孔隙分布无显著影响;矿化层与基材可以形成有效黏结.     

石油污染土壤生物修复与多技术联合修复策略研究进展及工程化应用

在传统石油污染土壤修复方法的基础上,综述了生物修复联合多技术修复石油污染土壤的方法、原理、研究现状及应用。并对如何更好地将生物修复与多技术相结合,提高修复效率和改善修复产物提出了展望,对采用以生物修复为核心的多技术联合修复策略在油田污染治理和生态环境恢复方面具有指导意义,以期为提高石油污染土壤修复效果提供依据。