Take actions against Persistent Organic Pollutants （POPs）

China is facing a great challenge to implement the Stockholm Convention, the participants said at the Sino-US Workshop on Science-Based Decision Making-Implementing the Stockholm Convention on Persistent Organic Pollutants (POPs) in Beijing.     

Occurrence and volatility of several trace elements in pulverized coal boiler

The contents of eight trace elements(Mn, Cr, Pb, As, Se, Zn, Cd, Hg) in raw coal, bottom ash and fly ash were measured in a 220 t/h pulverized coal boiler. Factors affecting distribution of trace elements were investigated, including fly ash diameter, furnace temperature, oxygen content and trace elements‘ characters. One coefficient of Meij was also improved to more directly show element enrichment in combustion products. These elements may be classified into three groups according to their distribution: Group 1. Hg, which is very volatile. Group 2: Pb, Zn, Cd, which are partially volatile. Group 3: Mn, which is hardly volatile. Se may be located between groups 1 and 2. Cr has properties of both group ! and 3. In addition, the smaller diameter of fly ash, the more relative enrichment of trace elements (except Mn). The fly ash showed different adsorption mechanisms of trace elements and the volatilization of trace elements rises with furnace temperature. Relative enrichments of trace elements(except Mn and Cr) in fly ash are larger than that in bottom ash. Low oxygen content can not always improve the volatilization of trace elements. Pb is easier to form chloride than Cd during coal combustion. Trace elements should be classified in accordance with factors.     

Heavy metals pollution in poultry and livestock feeds and manures under intensive farming in Jiangsu Province, China

The heavy metals pollution in poultry and livestock feeds and manures under intensive farming in Jiangsu Province was investigated. 97 feed and manure samples were sampled from 31 farming plants in 10 major cities of Jiangsu. 14 metals, including Zn, Cu, Pb, Cd, Cr, Ni, Mo, Mn, Ba, Co, Sr, Ti, As and Hg, were analyzed after samples acid digestion. The results showed that the most feed samples contained high concentration of metals exceeding National Hygienical Standard for Feeds. Meanwhile, it was found that Cu, Zn, Pb, Cd and Cr concentrations in animal manures were also high, for example, Cu concentration in a manure sample reached to as much as 1726.3 mg/kg. Heavy metals loading quantities in soil per year were then calculated when metals contaminated organic fertilizers were applied, and its effects on soil environmental qualitv were further evaluated.     

Biological removal of methanol from process condensate for the purpose of reclamation

The biological removal of methanol from condensate of ammonia manufacturing processes for the purpose of reclamation using contact type reactor was studied. Methanol of 60 mg/L was removed completely under an HRT of 1.12 h. Optimal inorganic nutrient dose was determined on evaluating methanol removal performance and dehydrogenase activities (DHA) under different nutrition doses. The optimal inorganic nutrient dose only gave an increase of conductivity of ca. 10μs/cm^2 in the effluent on treating synthetic condensate containing methanol of 30mg/L. The results demonstrated that biological removal of methanol was effective for the purpose of recovering the methanol-bearing condensate.     

石梁河水库水污染防治浅析

利用1996～2000年以来东海县环境监测站对石梁河水库水质的监测资料,对石梁河水库水质进行评价,进而分析了水库污染程度和原因,及水体变化趋势,提出了水污染防治的措施。     

突发性环境污染事故应急监测信息支持系统

丹东市突发性环境污染事故应急监测信息支持系统，是由危险源、危险物和地理信息等子系统组成。系统包含了危险源的数量、分布，危险物的种类、危险特性、监测方法、处置技术等信息，应用实践证明。该系统在污染事故的监测和处置过程中，具有很强的实用性。     

城市生活垃圾处理技术探讨

针对城市垃圾的迅速增长．垃圾污染问题异常尖锐的问题．介绍了中国城市生活垃圾的处理技术应用现状．分析了垃圾处理存在的一些问题．对目前常用的城市生活垃圾处理方法的优缺点进行对比分析，并提出了在未来一段时间里生活垃圾处理技术的研究方向，要彻底解决垃圾问题，仅靠各种处理技术是不够的．必须完善法律、法规；改进管理方法．加强环境监测；加大科技投入，提高技术装备水平；增加资金投入；加强宣传等。     

2003年美加大停电使空气清洁

据外刊报道，美国东北部和加拿大东南部在2003年8月14日大面积停电时，马里兰大学的研究人员Russell Dickerson感到机会来了。科学家长期以来就想知道电厂停电运行后空气质量如何变化。绝大多数烧煤（约100家）电厂停止运行，给了Dickerson一个理想的机会，他的研究小组乘飞机在停电24h后开始测量空气。他们得到证据确认处于上风的电厂对区域性气溶胶和臭氧生成起主要作用（Geophysical Research Letters 31（13），Li13106）。     

浅议农业源和生活源对长桥海的影响

通过对蒙自下游长桥海水质状况和主要污染源农业源、生活源的分析,提出污染控制对策。     

用现代计算机技术建立区域污染物总量控制信息管理系统

采用现代计算机技术与方法建立信息管理系统，对提高污染物总量控制等环境管理工作的效率非常有必要。章以广州经济技术开发区西区总量控制信息管理系统为例，介绍系统的的建立过程及主要功能。