Organochlorine pesticides (DDTs and HCHs) in soils from the outskirts of Beijing, China

Concentrations of HCH (hexachlorocyclohexane) and DDT (Dichlorodiphenyltrichloroethane) were determined in shallow subsurface (5-30 cm depth) and deep soil layers (150-180 cm depth) from the outskirts of Beijing, China. Concentrations of total HCHs (including alpha, beta, gamma, delta-isomers) and total DDTs (including p,p'-DDT, p,p'-DDE, p,p'-DDD, o,p'-DDT) in shallow subsurface soils ranged from 1.36 to 56.61 ng/g dw (median 5.25 ng/g), and from 0.77 to 2178 ng/g (median 38.66 ng/g), respectively, and those in the deeper layers were approximately an order of magnitude less. The spatial distribution of HCHs and DDTs reflected the known historical usage of these pesticides. No correlation between the concentrations of pesticides and soil organic matter content or clay content can be found. The factors affecting residue levels and compositions of DDT and HCH were discussed. The contour maps of beta/gamma ratios and DDT/DDE ratios for both the shallow subsurface and deep layer soils were drawn.     

富伦纸业污染治理成果的启示

本文报道了富伦纸业通过工艺与设备的调整与改造，工艺全程控制与末端综合治理，不但治理了环境污染，还获得了一定的经济效益。     

水体中有机污染物自然降解研究进展

水体中有机污染物的自然降解是影响污染物在环境中归趋过程的一个重要机制,一直是环境界研究的重点。归纳了水体中有机污染物自然降解的研究现状和研究方法,并以生物降解和光降解为例,指出目前在自然降解实验研究设计方面值得关注的一些问题。     

我国现行排污费征收办法及标准诸问题探讨

我国现行的排污费征收办法及标准存在着起征费的计征额时间界定不清、达标污水收费额高于某些超标污水的收费额，收费项目少、收费标准偏低，城市污水处理厂的排污费和监督管理不明确等一系列问题，应予以确定以增强执法的严肃性。     

香港地区建设项目环境影响评价制度分析

分析了香港建设项目环境影响评价制度体系的发展、现状及评价程序，总结了香港建设项目环境影响评价制度的特点，为中国内地建设项目环境影响评价制度的完善提出了借鉴依据。     

危险废物在填埋场中的浸出规律模拟实验方法研究

应用数学模型对危险物质的非饱水浸出机理进行了分析，并建立了小柱非饱和水模拟浸出实验系统，对危险废物在填埋场中的浸出规律进行了研究，结果表明，小柱模拟实验能较真实地反映实际填埋场中危险组中填埋场中的迁移和浸出规律，该系统的建立为我国危险废物填埋场的设计、施工及埋场的安全评价具有指导意义。     

硅藻土混凝剂在污染河水处理中的应用研究

以改性硅藻土为混疑剂，对具有不同污染特征的苏州河各支流污染水体进行了化学强化一级处理试验研究。结果表明，硅藻土混疑剂的最佳投药量随原水水质的不同而不同；硅藻土对C0Dcr和P有较高的去除效率，而对NH3-N的去除率不高；不同污染河水水质对硅藻土的混疑效果有比较显著的影响，表现为在混疑剂的最佳投药量条件下，C0Dcr去除量与原水CODcr之间存在着显著的线性关系。     

Photodegradation of bisphenol A in Fe(Ⅲ)-oxalate complexes solution

The aqueous photodegradation of bisphenol A (BPA) in the presence of Fe(Ⅲ)-oxalate complexes (Fe(Ⅲ)-Ox), which are common compositions of natural water, was investigated in this study. BPA underwent rapid indirect photolysis in Fe(Ⅲ)-Ox solution under simulated solar irradiation, proceeding pseudo-first-order kinetics. The photolysis rate increased with decreasing pH or initial processes of Fe(Ⅲ)-Ox complexes and contributed to the photooxidation of BPA, were determined by molecular probe and electron spin resonance (ESR) methods with the steady-state concentration of 2.56 × 10-14 mol/L. Superoxide anion radical (O2.-) was consistructural analysis of the intermediate photoproducts of BPA in Fe(Ⅲ)-Ox complexes solution, the possible degradation pathways of of Fe(Ⅲ) may affect the environmental fate of BPA in natural water significantly.     

论环境污染的外部不经济性及法律对策

文章对造成环境污染的外部不经济性原因进行了分析,指出只有通过政府干预,加强立法,明确环境资源产权,征收环境污染税收,开放排污权交易市场,才能利用市场机制优化环境资源的配置,合理的分配环境资源,从而实现整个社会最有效率地控制污染.     

燃煤锅炉烟气中NO_X脱除机理研究进展

燃煤电厂锅炉烟气中NOx的脱除技术已成为我国电力环保研究的新课题。文章在查阅大量烟气脱硝技术相关资料的基础上,对SCR、SNCR等成熟脱硝技术和催化氧化、非催化氧化、EBA、微生物法等新的脱硝技术机理进行了论述。对未来的研究方向和研究前景进行了展望。