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首页> 外文学位 >Novel vegetated sequencing batch biofilm reactor for treating suburban domestic wastewater.
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Novel vegetated sequencing batch biofilm reactor for treating suburban domestic wastewater.

机译：新型植被排序生物膜分批反应器，用于处理郊区生活废水。

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摘要

A practical and affordable wastewater treatment system serving small community in suburban areas was studied. The principal of the system studied capitalizes on the pollutant removal mechanisms of the soil-plant-microbial interactions of constructed wetlands. The shortcomings of conventional constructed wetland were attempted to be eliminated by optimizing the operating conditions for equivalent treatment efficiency. The system studied is a vegetated sequencing batch biofilm reactor integrated with the rhythmical movement of wastewater and air like that of a sequencing batch reactor. Nutrients in the domestic wastewater, which cause environmental nuisance like eutrophication, was targeted to be gotten rid of by the process.; Bench experiments were designed and carried out on the medium, namely coal slag and the plant, namely Cyperus alternifolius in the system. Two parallel systems were set up in both laboratory-scale and pilot-scale. The data from the lab-scale experiments were used to establish the nutrient mass balances and to understand the conversion efficiencies of pollutants through different removal mechanisms. With the longest contact time being tested in the pilot system, the treatment systems achieved around 60% removal efficiency for carbonaceous matters. The removals of ammonia nitrogen and phosphorus were about 50 and 40%, respectively, while the removal of total suspended solids was approaching 80%.; Multivariate regression, first-order kinetics and mass balance models were developed for the prediction of effluent concentration of ammonia nitrogen. The sensitivities of the controlling factors in the mass balance model, including influent ammonia nitrogen concentration, contact time, temperature and dissolved oxygen, were analysed. With the in-depth understandings of the effects of operating conditions on the system performance, contour plots were prepared from the ammonia nitrogen removal predictive model under two temperature ranges of temperate climate. The required contact time for achieving any desired levels of removal efficiencies could be predicted under different influent concentrations.; Treating the domestic wastewater from small community, specifically in suburban areas, the system was found to be cost-effective compared to the conventional activated sludge processes and constructed wetlands, for equivalent treatment efficiencies.
机译：研究了一种实用且价格合理的废水处理系统，可服务于郊区的小社区。研究的系统原理利用了人工湿地中土壤-植物-微生物相互作用的污染物去除机理。试图通过优化操作条件以获得等效处理效率来消除常规人工湿地的缺点。所研究的系统是一个植被测序分批生物膜反应器，与测序分批反应器的废水和空气的节奏运动相结合。该工艺旨在消除生活污水中的营养，这些营养物会引起富营养化等环境干扰。在系统中设计并在介质（即煤渣）和植物（交替莎草）上进行了基准实验。在实验室规模和中试规模上建立了两个并行系统。来自实验室规模实验的数据用于建立营养物质的质量平衡并了解污染物通过不同去除机理的转化效率。在中试系统中测试了最长的接触时间后，处理系统对碳质物质的去除效率达到了60％左右。氨氮和磷的去除率分别约为50％和40％，而总悬浮固体的去除率接近80％。建立了多元回归，一阶动力学和质量平衡模型来预测氨氮的出水浓度。分析了质量平衡模型中控制因素的敏感性，包括进水氨氮浓度，接触时间，温度和溶解氧。通过深入了解操作条件对系统性能的影响，从温带气候两个温度范围内的氨氮去除预测模型准备了等高线图。在不同的进水浓度下，可以预期达到任何期望的去除效率水平所需的接触时间。与常规的活性污泥法和人工湿地相比，该系统在处理小型社区（尤其是郊区）的生活废水时具有成本效益，并且具有同等的处理效率。

著录项

  • 作者

    Chan, Shing Yan.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Sanitary and Municipal.; Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 268 p.
  • 总页数 268
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;环境污染及其防治;
  • 关键词

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