Ubiquity of bisphenol A in the atmosphere

Bisphenol A (BPA) is a suspected endocrine disruptor in the environment. However, little is known about its distribution and transport in the atmosphere. Here, the concentrations of BPA in the atmospheric aerosols from urban, rural, marine, and the polar regions were measured using solvent extraction/derivatization and gas chromatography/mass spectrometry technique. The concentrations of BPA (1-17,400 pg m⁻³) ranged over 4 orders of magnitude in the world with a declining trend from the continent (except for the Antarctica) to remote sites. A positive correlation was found between BPA and 1,3,5-triphenylbenzene, a tracer for plastic burning, in urban regions, indicating that the open burning of plastics in domestic waste should be a significant emission source of atmospheric BPA. Our results suggest that the ubiquity of BPA in the atmosphere may raise a requirement for the evaluation of health effects of BPA in order to control its emission sources, for example, from plastic burning.     

Natural Weathering of Polypropylene and Waste Tire Dust (PP/WTD) Blends

Three series of polypropylene and waste tire dust (PP/WTD) blends using three different WTD sizes were prepared, compression-molded and cut into dumbbells. The specimens were exposed to natural weathering in the northern part of Malaysia for a period of 6 months. The results show that at the same blend composition, blends with fine WTD size exhibit higher mechanical properties than that of blends with coarse WTD after exposure to natural weathering. Regardless of WTD size, the retention of tensile strength and elongation at break, E_b increases with the increase in WTD content. From the exposed surface morphology, it is apparent that the blends with fine WTD and WTD-rich blends were able to withstand weathering better than blends with coarse WTD and PP-rich blends. The DSC thermograms suggest that the overall drop in melting temperature (T_m) of the exposed blends decreases as the WTD content increases.     

上海与东京生活垃圾处理回收体系之比较

进入21世纪，上海提出建设循环经济型国际大都市的战略目标，其中很重要的一个领域就是要构筑高效、实用的生活垃圾处理回收体系。文章分析了上海与东京现行的生活垃圾处理回收体系的特点，并对二者进行了比较。发现上海体系存在着垃圾处理方式的简单化，垃圾分类收集形式化，废品回收无序化，对策视点局限性和管理系统封闭性等诸多缺陷。通过借鉴东京体系的成功经验，建议实施法律和经济的手段。不断改进和完善上海体系。     

美国危险废物的管理与处理处置

以危险废物的全过程管理为主线 ,阐述了美国现阶段危险废物管理的特点 ;通过介绍美国危险废物管理的重要法典《RCRA》,对美国危险废物管理体系进行全面分析 ;重点分析了对我国建立危险废物管理体系有借鉴意义的豁免制度、贮备金制度     

新型干法水泥生产线废气污染物治理技术研究

介绍了生产能力2000t·d-1的新型干法水泥生产线生产过程产生废气(主要是粉尘)的情况,针对废气排放特点,采用包含末端治理在内的综合治理措施进行治理。治理工程运行稳定,处理效果达到《水泥厂大气污染物排放标准》(GB4915-1996)Ⅲ时段二级标准和无组织排放二级标准的要求。     

废旧锌锰电池回收处理工艺的探讨

由于电池耗费量日益增加,废旧电池导致的环境污染问题倍受关注。通过对废旧电池的调研和处理技术的对比研究,提出了“焙烧—电解”回收处理废旧锌锰电池的工艺技术。在600℃、隔绝空气焙烧3h的试验条件下,“焙烧—电解”工艺不仅可回收大量的二氧化锰、锌、氯化锌、炭棒、铜帽、铁皮、蜡等资源,而且废气、废水、废渣经处理后完全达标排放。阐述了具体的“焙烧—电解”工艺。     

国家半导体行业VOC排放标准制订研究

随着近年来我国半导体产业的持续繁荣发展,中国已成为全球半导体制造增长最为迅速的市场。为有效控制监管半导体生产过程中大量使用的各种有机溶剂所产生的废气中可挥发性有机物(VOC)的排放,加强行业污染控制,规范行业环境保护管理工作,对制订半导体行业VOC排放标准进行了研究。概述了半导体行业VOC排放的特点。分析了该行业对VOC排放的治理技术。阐述了美国和中国台湾地区有关半导体行业VOC废气的排放标准。从国内半导体企业VOC治理现状、现有监测技术、VOC排放管理方式等方面探讨了我国半导体行业VOC废气排放标准的制定思路。     

我国塑料污染防治政策分析与建议

塑料污染是全球广泛关注热点,更是环境治理难点.基于我国印发的升级版"禁/限塑令",系统回顾了2007年以来"禁/限塑令"的实施效果,梳理了塑料制品及塑料垃圾管控政策进展,指出升级版"禁/限塑令"在政策制定、落实执行和监督监管这3个角度存在一定不足.在此基础上,提出将塑料污染防治纳入国家基本法律法规体系、搭建公众意见网络平台和加大"禁/限塑令"政策宣传与公众自身利益相协调等对策建议,同时强调未来塑料制品管控对策需要关注的重点方向,如小型零售门店的"禁/限塑令"的"盲区"难题、环保责任合理均摊、新材料新工艺的开发、建立完善的废塑料回收和循环利用体系等.通过以上分析,从源头预防角度为塑料污染提供防治思路.     

城市生活垃圾焚烧重金属研究分析

以当前我国城市生活垃圾焚烧处理现状为依据,通过文献综述法详细介绍了城市垃圾焚烧过程中重金属的迁移及分布规律,并提出重金属污染防控对策建议。     

Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent

Calcium carbonate is used in large amounts in the pulp and paper industry as a paper filler. When it is manufactured, the calcium carbonate waste is purged from the process. Here we demonstrate that, due to the elevated calcium concentration of 168.5 g kg⁻¹ dry weight (dw), alkaline pH of 12.6 and neutralizing (liming) effect value of 42.4% expressed as Ca equivalents, this waste is a potential liming agent and a pH buffer. The heavy metal concentrations in the waste were lower than the new Finnish limit values for fertilizers used in agriculture, as well as for a material, e.g. ash, used as an earth construction agent. These limit values came into force in March 2007 and in June 2006, respectively.