非开挖技术在城市污水管道施工中的应用

本文介绍了非开挖技术施工工艺在城市污水管道施工中具体的应用情况,解决了在市政建设中传统开挖技术所无法解决的问题,取得了很好的经济效益和社会效应。     

引水冲污工程流量的分析与确定

通过对福州市近年来实施的引水冲污工程中有关引水流量的问题进行了分析,并提出了确定引水流量的方法。     

提高污水处理设施运营资金使用效率的几点建议

在详细分析我国城市污水处理设施发展现状的基础上 ,针对目前设施运营资金利用率低下、资金使用混乱等严重阻碍污水处理设施良性运营的局面 ,提出了提高污水处理设施运营资金使用效率的几点建议。     

重力出流式MBR处理生活污水及毛纺废水

针对膜生物反应器(MBR)能耗高的问题，开发了一种利用生物反应区内液位水头的重力出流式MBR。采用该反应器处理生活污水和毛纺废水，处理出水水质达到了《城市污水再生利用——城市杂用水水质》(GB／T 18920-2002)标准。试验结果表明：选择合适的曝气量不仅有助于提高膜通量、有利于控制膜污染，还有利于生物反应器中氧的传递。MBR系统中污泥浓度为12g／L、表观气速从O．028m／s上升到O．085m／s时，混合液中与清水中氧总转移系数的比值基本维持在O．27～O．29的水平。     

The Impact of Plastic Materials on Iron Levels in Village Groundwater Supplied in Malawi

I ron is not normally considered to be a constituent of health significance, and recommended limits for iron in drinking water supplies are based on aesthetic considerations. Experience in Malawi has demonstrated that, even when present in only trace amounts, iron can influence the consumer's acceptance of an improved borehole supply. The effect of the use of plastic construction materials on the iron content of village groundwater supplies was investigated using a statistical approach. The majority of groundwater points using only plastic materials was found to supply water containing less than the WHO guideline value of 0.3 mg/l iron. In contrast, the use of ferrous-materials increased the iron content of the water to unacceptable levels, sometimes causing the consumers to reject the borehole as a source of drinking water.
Bacteriological data show that the quality of the alternative, traditional supply is far inferior to the new improved supply. An otherwise perfectly safe supply may therefore be abandoned as a direct result of contamination introduced by 'down the hole' components. This frustrates efforts to improve the well-being of rural communities, and is a waste of precious development resources.     

Impact in Scotland of UK and EC Sewage Legislation

The EC Directive (91/271/EEC) concerning urban waste water treatment has far-reaching financial and technological implications for local authorities in Scotland which are responsible for sewerage. Increased capital consent limits and additional financial assistance from central government are essential if the requirements of the legislation are to be met.
Although the Directive is welcomed in general terms, the sections of the legislation dealing with the identification of sensitive waters and the provision of primary treatment for coastal discharges to less sensitive waters are of limited environmental significance in Scotland.
The elimination of sewage sludge disposal at sea will create severe difficulties for Scottish authorities as a high percentage of sewage sludge is currently disposed of at sea. Each of the main alternative disposal options presents environmental, financial and technical problems and, in the case of incineration, the certainty of widespread unpopularity with the public.     

水源热泵设计应用问题

水源热泵是许多生产厂家大力宣传的一项节能技术。文章从系统的角度,分析了水源热泵系统的应用过程,提出水源热泵系统应该考虑地下水水温水质及土壤含水层的性质,设置合理的空调水系统才能节能。论述了水源热泵系统使用过程中常见的问题及利用水源热泵同时供冷与供热的问题。     

城市污水生物脱氮除磷应用技术

对近年来国内外城市污水生物脱氮除磷工艺机理的研究成果进行了综述 ,介绍了几种常见的生物脱氮除磷工艺 ,并从生物脱氮除磷系统内微生物群体动态平衡的角度详细论述了生物脱氮除磷工艺的影响因素 .     

燃气灶具检测自动控制系统的研究

论述了一种用于家用燃气灶具检测的自动控制系统的功能与结构、硬件与系统软件的设计以及该系统的优势。