Resistance and biosorption mechanism of silver ions by Bacillus cereus biomass

Biosorption of silver ions onto Bacillus cereus biomass was investigated. Overall kinetic experiments were performed for the determination of the necessary contact time for the attainment of equilibrium. It was found that the overall biosorption process was best described by pseudo second-order kinetic model. The crystals detected by scanning electron microscope and X-ray photoelectron spectroscopy suggested the precipitation was a possible mechanism of biosorption. The molecular genetics of silver resistance of B. cereus biomass was also detected and illustrated by a whole cell sensor tool.     

Adsorptive property of Cu^2＋-loaded montmorillonite clays for Escherichia coli K_（88） in vitro

The Cu²⁺-loaded montmorillonite clays (MMT-Cu) may be a good material for the adsorbed and eliminated pathogenic bacteria from aqueous solution.     

SCADA系统在污染物治污工况在线监控系统中的应用

本文介绍了SCADA系统在内蒙古自治区重点污染源治污工况在线监控系统中的应用,系统以西门子成熟S7—200系列可编程序控制器为在线监测设备,基于OPC（OLE for Process Control）技术,以WINCC为监控平台,实现了自治区内重点污染源企业治污工况的远程监测、污染物排放的有效管理。     

Genotoxicity removal of reclaimed water during ozonation

Genotoxicity in wastewater and reclaimed water now is gaining increased attention because of genotoxins' potential damage to the ecosystem and human health. The effect of ozonation on genotoxicity in reclaimed water was investigated. It was found that ozonation decreased the genotoxicy dramatically in three tertiary treatment plants. In the further batch ozonation experiment in laboratory,secondary effluent sample used exhibited the genotoxicity of(41.1 ± 4.1) μg 4NQO/L. Ozonation with a dose of 10 mg O3/L completely removed the genotoxicity in secondary effluent. However,after ozonation, the dissolved organic carbonvalue of the sample didn't change much but the specific ultraviolet absorbance(SUVA) value dropped sharply. With the help of Fourier transform infrared spectroscopy, ozonation was found to change chemical aliphatic carbon and C–O of the dissolved arganic matter, which might be the reason of the significant decreases of SUVA and genotoxicity.     

南京市黑臭河流水体中细菌多样性的研究

以南京市城南河为研究对象,分别提取上中下游的水体样本,分析水质中的氮、磷、COD等水质指标,并利用变性梯度凝胶电泳技术(DGGE)分析了城南河不同位置的细菌多样性。结果表明:城南河水体中的平均总氮为30.06 mg/L,总磷为6.14 mg/L,COD为42.03 mg/L,均超过国家V类水质标准。结合外观,城南河属于严重污染的典型黑臭河流。DGGE分析的结果表明:城南河具有较高的细菌多样性,优势菌群主要是变形菌门和拟杆菌门2大类群,且不同取样点细菌种类差别不大。     

规模化养牛场牛粪污综合利用研究

利用牛粪生产沼气,并将副产物有效利用是处理牛粪污的有效途径,为提高牛粪厌氧发酵的产气效率和副产物的利用率,整体工艺采用牛粪发酵前固液分离,固体进行好氧发酵回填牛卧床,分离液进行厌氧-好氧发酵,厌氧发酵产生沼气为系统增温,最后液体通过人工湿地处理达标排放。结果表明:对牛粪进行发酵前固液分离,降低了物料的粘度,利于微生物的传质,可以取得较好的产气效果,沼气通过沼气燃烧炉转化为热能为系统增温降低了其他能源的供给,同时湿地的利用也有效地改善了养牛场周边环境,为牛粪污生产沼气工程提供新思路。     

大型浮顶储罐雷击事故分析及防雷技术研究

通过对典型大型浮顶储罐雷击事故分析,总结了这些事故的共性问题。结合浮顶储罐雷击形式及雷电火花放电研究,分析了大型浮顶储罐雷击火灾事故的机理。岚山输油站在等电位连接、一次密封形式结构等方面进行技术改造,经过验证这些措施有效减少了大型浮顶储罐火灾事故的发生。     

重金属污染土壤的植物修复技术研究进展探讨

大多数传统的重金属污染治理技术成本高,会引起土壤肥力下降,对各类生态系统造成负面影响。植物修复技术是一种成本低、环境友好的方法,不会对土壤性质和生态系统产生不利影响。文章综述了植物修复治理重金属污染土壤的研究进展,探讨如何通过采取物理、化学、生物技术及农艺措施等方法提高修复植物的生物量和重金属积累量并展望了今后的研究方向。     

福建省电气火灾发生规律及防治对策研究

统计并分析2008—2012年福建省电气火灾相关数据,研究了福建省电气火灾的特点及规律。分析结果表明:福建省电气火灾形势比较严峻,其中电气线路故障是引发福建省电气火灾的主要原因,住宅、宿舍、厂房、交通工具是电气火灾发生的重要场所。各建筑物类型中多层建筑物的电气火灾所占比例最大,且电气火灾具有明显的地域、时空差异等特点。针对福建省电气火灾发生规律,本文提出相应的防治对策。     

超声波联合PAM对污泥脱水性能的影响

以污泥脱水性能与沉降性能为指标,研究了超声波调理联合PAM对污泥脱水性能的影响。实验结果表明,单独使用超声波调理的最佳调理时间为20 s,此时污泥比阻为0.68×109s2/g;采用PAM对污泥进行调理时,在浓度为0.1%,投加量为100 mg/L时污泥比阻最小,为0.32×109s2/g;采用超声波与PAM联合调理时,利用正交试验得到最适合的组合条件为:调理时间20s、PAM投加量100 mg/L、浓度0.15%。