非平衡等离子体治理有机含磷气体的实验研究

采用脉冲电晕放电产生的等离子体对沙林毒剂的模拟剂甲基磷酸二甲酯进行消除研究.着重进行了脉冲峰压、脉冲频率、初始质量浓度、气体流量等对消除率的影响实验.结果发现,消除率随脉冲峰压和脉冲频率的增加而提高,随气体流量和初始质量浓度的增大而降低.同时发现产物中含有C02、H2O、丙酸、甲基磷酸甲酯和磷酸(或P2O5)等物质.     

垃圾焚烧发电厂烟气净化工艺及应用

本文介绍了引进的西格斯烟气净化技术的工艺流程和技术特点，并就采用该技术建设的深圳某垃圾焚烧发电厂烟气排放指标和国家标准及实测值进行了比较。     

当前排污费征收中的问题和发展方向

本文针对在2000年“一控双达标”工作后排污费征收中出现的问题，提出了相应的解决办法，同时对排污费今后的发展作了简要阐述。     

PREDICTION OF TWO-YEAR PEAK STREAM-DISCHARGES USING NEURAL NETWORKS1

ABSTRACT: The cascade correlation neural network was used to predict the two-year peak discharge (Q₂) for major regional river basins of the continental United States (US). Watersheds ranged in size by four orders of magnitude. Results of the neural network predictions ranged from correlations of 0.73 for 104 test data in the Souris-Red Rainy river basin to 0.95 for 141 test data in California. These results are improvements over previous multilinear regressions involving more variables that showed correlations ranging from 0.26 to 0.94. Results are presented for neural networks trained and tested on drainage area, average annual precipitation, and mean basin elevation. A neural network trained on regional scale data in the Texas Gulf was comparable to previous estimates of Q₂ by regression. Our research shows Q₂ was difficult to predict for the Souris-Red Rainy, Missouri, and Rio Grande river basins compared to the rest of the US, and acceptable predictions could be made using only mean basin elevation and drainage areas of watersheds.     

Iron toxicity resistance strategies in tropical grasses: The role of apoplastic radicular barriers

The revegetation of mined areas poses a great challenge to the iron ore mining industry. The initial recovery process in degraded areas might rely on the use of Fe-resistant grasses. Tropical grasses, such as Paspalum densum and Echinochloa crus-galli, show different resistance strategies to iron toxicity; however, these mechanisms are poorly understood. The Fe-resistance mechanisms and direct iron toxicity as a function of root apex removal were investigated. To achieve this purpose, both grass species were grown for up to 480?hr in a nutrient solution containing 0.019 or 7?mmol/L Fe-EDTA after the root apices had been removed or maintained. Cultivation in the presence of excess iron-induced leaf bronzing and the formation of iron plaque on the root surfaces of both grass species, but was more significant on those plants whose root apex had been removed. Iron accumulation was higher in the roots, but reached phytotoxic levels in the aerial parts as well. It did not hinder the biosynthesis of chloroplastidic pigments. No significant changes in gas exchange and chlorophyll a fluorescence occurred in either grass when their roots were kept intact; the contrary was true for plants with excised root apices. In both studied grasses, the root apoplastic barriers had an important function in the restriction of iron translocation from the root to the aerial plant parts, especially in E. crus-galli. Root apex removal negatively influenced the iron toxicity resistance mechanisms (tolerance in P. densum and avoidance in E. crus-galli).     

某城市城镇污水处理厂COD排放现状评价分析

基于统计学的方法理论,分析北方某城市11家采用二级处理或二级强化处理工艺的城镇污水处理厂3 a例行监测数据,得到该城市城镇污水处理厂化学需氧量(COD)的排放浓度呈Delta-对数正态分布.在此基础上,借鉴美国水污染物排放限值制订方法,对该城市城镇污水处理厂COD任意一天排放和月均排放情况进行评价分析,得到其任意一天最大值低于《城镇污水处理厂污染物排放标准》(GB 18918-2002)中一级A标准(50 mg·L-1)要求,同时提出了月均排放评价结论,并对相关结论进行了讨论.本研究所探索的方法体系和结论可为相关污染物排放标准的制修订提供参考.     

造纸工业废水排放新标准下的小企业生存现状分析

本文课题组通过选择有代表性的某省,走访地方环保部门,深入每家造纸企业,对企业的产品、原料、规模、废水处理工艺及污染防治设施及经济效益等方面数据的收集整理与分析,了解《造纸工业水污染物排放标准》(GB3544-2008)新标准实施后我国小造纸企业的生存现状和显现的问题,提出了为实现我国小造纸企业持续健康发展的对策和建议。     

电镀废水治理方案分析研究

某矿山机械装备公司退城进园,该公司电镀车间产生含锌、含铬、含镍、含铁等重金属电镀废水,污染物浓度远超过《电镀污染物排放标准》（GB 2190-2008）标准限值.该公司针对目前生产废水中污染物种类多、水质复杂的特点,采用对电镀废水经化学分质处理的工艺,再经反渗透处理后部分回用,剩余废水及膜的浓缩液经二效真空低压蒸发处理,结晶盐作为危险固废处置,实现废水“零排放”.该项目建成后为企业的进一步发展提供可靠的保障.     

初始排污权分配与核定机制研究

2006年以来,国家环保部在十余个省试点排污权交易工作,浙江省成为试点之一,并在杭州、嘉兴等地率先推行试点工作。W市在施行建设项目排污权交易的基础上,积极推行初始排污权分配与核定,逐步开展初始排污权有偿使用,在夯实排污权交易基础工作中做了有益探索。该文以W市的初始排污权分配与核定过程为例,探索适合于中国的初始排污权分配机制,为各地开展排污权交易工作提供参考。