Development of a novel sewage treatment system for developing countries.

为发展中国家开发新型污水处理系统。

基本信息

批准号：
13355022
负责人：
OHASHI Akiyoshi
金额：
$ 25.21万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13355022/
关键词：
Developing countries Sewage treatment Low cost Methane Molecular biology UASB DHS Nitrification and Denitrification

项目摘要

Current sewage treatment system such as activated sludge is not suitable in developing counties due to high costs and high energy requirement. An "appropriate technology" of sewage treatment must be developed for developing countries. Recently UASB is attractive technology for sewage treatment in developing countries since it guarantees low construction and operational cost, produce energy as methane and less amount of sludge. However UASB alone can not meet discharge criteria, so that further option is needed to polish up UASB effluent without losing UASB strong point. As a proper system, we have proposed DHS (Down-flow Hanging Sponge) reactor. The principle of DHS is the use of a polyurethane sponge as a medium to retain biomass. The concept is similar to that of tricking filter, except that the packing material is sponge, which has a void space of more than 90%, resulting in a significant increase in entrapped biomass and thus longer solid retention time (SRT). As the sponge in a DHS is not submerged and freely hung in the air, oxygen is dissolved into the wastewater when it flows down the reactor. Therefore there is no need for external aeration or any other energy inputs. Moreover, production of excess sludge from DHS is negligible as longer SRT provides considerable time for autolysis of sludge in the system itself.Demonstration-scale DHS reactor with a treatment capacity of 1,000m^3・d^<-1> has been installed since 2002 by Indian government in India. We monitored this system as well as last year. DHS reactor has been operated at HRT of 1.49hr. As a long-term experimental period, we can see the excellent performance of DHS in terms of BOD, COD and fecal coliform removal which were 93%, 88% and 2 order, respectively without any problem. As a these result, a real scale DHS is planned on constructing in Agra city, India by Indian government.

由于高成本和高能源需求，当前的污水处理系统（例如活性污泥）不适合发展县。必须为发展中国家开发污水处理的“适当技术”。最近，UASB是发展中国家污水处理的有吸引力的技术，因为它可以保证建筑和运营成本较低，产生能源为甲烷和污泥量减少。但是，仅UASB无法符合出院标准，因此需要进一步的选择来增强UASB效应而不会失去UASB强度。作为一个适当的系统，我们提出了DHS（下流悬挂的海绵）反应器。 DHS的原理是使用聚氨酯赞助商作为保留生物量的培养基。该概念类似于欺骗过滤器的概念，除了包装材料是赞助商，其空隙空间超过90％，从而导致注册生物量显着增加，从而增加了较长的固体保留时间（SRT）。由于DHS中的赞助商没有被淹没并悬挂在空气中，因此当氧气流下反应堆时，氧气被溶解在废水中。因此，不需要外部通气或任何其他能源输入。此外，从DHS产生过多的污泥是可以忽略的，因为更长的SRT为系统本身中的污泥进行了考虑。Dondscale-Scale-Scale-Scale-Scale Scale Scale Scale Scale Scale Scale Scale Scale srt自2002年以来印度政府在印度的印度政府自2002年以来就安装了1,000m^3 ・ d^<-1>。我们和去年监视了该系统。 DHS反应堆的HRT为1.49小时。作为一个长期的实验期，我们可以看到DHS在BOD，COD和粪便切除方面的出色表现，分别为93％，88％和2个顺序，没有任何问题。作为这些结果，印度政府计划在印度阿格拉市建造一个真实规模的DHS。