地下水资源的合理开发利用

地下水是我国城市和工农业用水的主要供水水源。但是,目前我国地下水开发利用不够合理,不仅直接破坏了地下水资源,而且诱发了一系列环境地质问题及次生生态环境问题。本文提出应当把地下水环境容量作为地质环境目标管理的基本依据和地质环境保护规划的主要约束条件,从而将容量概念引入到地下水开发利用管理中的观点。     

Enzyme extraction by ultrasound from sludge flocs

Enzymes play essential roles in the biological processes of sludge treatment. In this article, the ultrasound method to extract enzymes from sludge flocs was presented. Results showed that using ultrasound method at 20 kHz could extract more types of enzymes than that ultrasound at 40 kHz and ethylenediamine tetraacetic acid (EDTA) methods. The optimum parameters of ultrasound extraction at 20 kHz were duration of 10 min and power of 480 W. Under the condition, ultrasound could break the cells and extract both the extracellular and intercellular enzymes. Ultrasound power was apparently more susceptive to enzyme extraction than duration, suggesting that the control of power during ultrasound extraction was more important than that of duration. The Pearson correlation analysis between enzyme activities and cation contents revealed that the different types of enzymes had distinct cation binding characteristics.     

Pollutants removal and simulation model of combined membrane process for wastewater treatment and reuse in submarine cabin for long voyage

A laboratory scale test was conducted in a combined membrane process (CMP) with a capacity of 2.91 m3/d for 240 d to treat the mixed wastewater of humidity condensate, hygiene wastewater and urine in submarine cabin during prolonged voyage. Removal performance of chemical oxygen demand (COD), ammonia nitrogen (NH4 +-N), turbidity and anionic surfactants (LAS) was investigated under di erent conditions. It was observed that the e uent COD, NH4 +-N, turbidity and LAS flocculated in ranges of 0.19–0.85 mg/L, 0.03–0.18 mg/L, 0.0–0.15 NTU and 0.0–0.05 mg/L, respectively in spite of considerable fluctuation in corresponding influent of 2120–5350 mg/L, 79.5–129.3 mg/L, 110–181.1NTU and 4.9–5.4 mg/L. The e uent quality of the CMP could meet the requirements of mechanical water and hygiene water according to the class I water quality standards in China (GB3838-2002). The removal rates of COD, NH4 +-N, turbidity and LAS removed in the MBR were more than 90%, which indicated that biodegradation is indispensable and plays a major role in the wastewater treatment and reuse. A model, built on the back propagation neural network (BPNN) theory, was developed for the simulation of CMP and produced high reliability. The average error of COD and NH4 +-N was 5.14% and 6.20%, respectively, and the root mean squared error of turbidity and LAS was 2.76% and 1.41%, respectively. The results indicated that the model well fitted the laboratory data, and was able to simulate the removal of COD, NH4 +-N, turbidity and LAS. It also suggested that the model proposed could reflect and manage the operation of CMP for the treatment of the mixed wastewaters in submarine.     

电解铝含氟废气治理技术探讨

在电解铝生产过程中,产生主要特征污染物-氟化物,如何削减氟排放量,成为电解铝行业发展的关键;本文对"n型喷射两级逆流吸附干法净化技术"的工艺流程及烟气净化技术及效果进行了分析探讨,达到了电解铝含氟废气污染治理的目的.     

徐州市环境监测网络建设现状及发展探讨

从环境质量监测、污染源监测、应急监测、生态监测和监测信息等方面对徐州市环境监测网络建设的现状进行分析及未来徐州市环境监测网络的发展探讨.     

全国产品回收利用基础与管理标委会成立

从日前召开的全国产品回收利用基础与管理标准化技术委员会成立大会上获悉,一批涉及废旧产品和废弃物回收利用的国家标准正在加紧制定。     

电子废弃物物流及责任方安全职责分析

电子废弃物回收再利用属于逆向物流。阐述了我国电子废弃物物流的特点和模式,系统分析了电子废弃物物流框架,重点阐明在电子废弃物回收再利用中各责任方的安全职责：电子产品生产者具有全面责任;消费者具有经济责任和物质责任;政府管理部门具有宏观调控和监督协调责任;物流方有微观控制和安全保管的责任。     

建筑废弃物回收再利用项目运作模式刍探

建筑废弃物处理是城市建设中的一大难题,如果实行简单填埋,不仅污染环境、造成资源浪费,而且也耗费政府大量财力。介绍了深圳市龙岗区通过创新招标方式,公开出让特许经营权,引入企业运用先进技术对建筑废弃物实行综合再利用的一些做法,同时对城市建筑废弃物回收再利用如何实现规模化和产业化发展,以及政府在推动循环经济发展方面如何将经济效益与社会效益有机结合提出了一些看法。     

拆解企业落户天津 静海以旧换新即将启动

天津市商务委、财政局全权委托市政府采购中心进行的天津市家电“以旧换新”销售、回收企业征集工作全面结束,拆解企业已确定为静海绿天使再生资源回收利用有限公司,销售和回收企业最终花落谁家目前仍需等待中标结果。据了解,除天津市以外,北京、上海等试点城市“以旧换新”工作也已进入招投标阶段,业内人士分析,家电“以旧换新”业务很可能于2009年8月正式启动。     

《再生资源与循环经济》稿约

《再生资源与循环经济》是由中华全国供销合作总社主管,中华全国供销合作总社天津再生资源研究所、中国再生资源回收利用协会主办,面向国内夕卜公开发行的综合性技术刊物,主要宣传国家有关再生资源回收利用和循环经济的方针、政策,着重介绍国内外再生资源回收、加工利用、垃圾资源化处理、环保产业、