【作者】 王旭；

【导师】 金鹏康；

【作者基本信息】 西安建筑科技大学 ， 环境工程， 2011， 硕士

【摘要】 基于西北某县城现有污水处理设施处理能力不能满足全负荷运行的要求以及存在的水资源严重短缺的问题,论文提出了A~2/O与MBR的组合工艺,以期在有限占地面积内实现污水处理能力由2500m~3/d提升至5000m~3/d的扩容以及污水再生利用的双重目的,项目的实施对西北干旱缺水地区污水再生利用以及污水处理厂的升级改造提供了典范。基于污水水质特性,研究设计了A~2/O生物处理工艺,并将厌氧池、缺氧池、好氧池的有效水深提高至10.5m以解决在有限的占地面积内有足够长的停留时间完成污染物降解。依据有机物和氮磷营养物质比例,好氧池、厌氧池和缺氧池的水力停留时间分别为1.5h、4h、4.5h。后续膜生物反应器(MBR)采用内置淹没式配置,水力停留时间为1h。对A~2/O-MBR工艺工况影响因素和长期运行效果研究结果表明,处理水各项水质指标均达到《城市污水再生利用城市杂用水水质》(GB/T18920-2002)的要求。并结合实际运行管理特点和工艺设计,分析了膜污染机理,制定了膜污染控制模式。通过与传统活性污泥与二级处理水深度处理工艺比较,分析评价了该工艺的经济指标,指出了A~2/O-MBR组合工艺不仅具有水质优良、占地面积小等特点,且具有能耗低的优势。更多还原

【Abstract】 Based on the drawback problem of existing treatment facilities that can not satisfy the full load capacity in a northwest town and the water resources shortage, this paper presented the combination process of A~2/O and MBR to fulfill the handling ability of waster from 2500m3/d to 5000m3/d under the limited area, meanwhile achieved wastewater recycling. The project can provide an example for reusing of wastewater and advancing of sewage treatment plant in northwest area.Based on wastewater quality characteristics, the A~2/O biological treatment process was chosen, and the effective water depth of the anaerobic tank, anoxic, aerobic tank was increased to 10.5m. This achieved the purpose of degradation of pollutants completely within a limited area under an enough long hydraulic retention time. Depending on the proportion of organic matter and nutrients of nitrogen and phosphorus, the hydraulic retention time of aerobic tank, anaerobic tank and anoxic tank was 1.5h, 4h, 4.5h respectively. The hydraulic retention time of subsequent membrane bioreactor (MBR) adopted a built-submerged configuration was 1h. The influence factors and the long-term operation effect of A~2/O-MBR showed that the finished water quality achieved the requirements of "urban wastewater reuse for urban reclaimed water quality" (GB/T18920-2002). This paper analyzed the mechanism of the membrane fouling and constructured a membrane fouling control model, Combining with the actual operation management features and process design.Comparing with conventional activated sludge treatment and advanced sencordary effulent, this study assessed economic indicator of the process, and implied the numerous advantage of the A~2/O-MBR process that can obtain higher water quality with a small covering area and lower energy consumption.更多还原