Thermophilic High Speed Treatment of Wastewater by a Novel Anaerobic UASB Reactor

新型厌氧UASB反应器高温高速处理废水

基本信息

批准号：
07555172
负责人：
OHASHI Akiyoshi
金额：
$ 4.54万
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 (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

All practical-scale UASB processes constructed so far have adopted either mesophilic or ambient temperature conditions. There is at present no thermophilic UASB process in operation, except one demonstration-scale process. One of the main causes hindering the dissemination of thermophilic UASB process may be the difficulty or less reliability of granule formation, compared with mesophilic processes.In order to investigate the performance of new developed thermophilic UASB reactor and the behavior of methanogenic activities of the retained sludge, the laboratory-scale UASB reactor was operated approximately 2 years by feeding with an alcohol distilllery wast under thermophilic conditions (55ﾟC). The reactor was inoculated with mesophilically-grows granulated sludge harvested from an UASB reactor receiving a carbohydrate (mainly juice) waste water.The novel thermophilic UASB reactor having a multistage of gas solid separator resulted in a low SVI and good stability of retained granulated sludge. As a result of establishment of well-settleable, high-activity granuled sludge, the reactor allowed ultimately a volumetric organic loading of 100kgCOD/m3/day, with a COD removal efficiency of around 85-90%. Methanogenic activities of the retained sludge reached finally up to 2.9g COD/g VSS/d for acetate, 0.69g COD/g VSS/d for propionate, and 16.2g COD/g VSS/d for hydrogen. Low values of the propionate-fed methanogenic activity compared to other thermotrophic groups, indicate that the propinate breakdown is mostly subject to be a rate-limiting step in thermophilic methane fermentation process.

迄今为止建造的所有实用规模的UASB工艺均采用中温或常温条件，除一项示范规模工艺外，目前尚无正在运行的高温UASB工艺，这可能是阻碍高温UASB工艺推广的主要原因之一。与中温过程相比，颗粒形成困难或可靠性较低。为了研究新开发的高温UASB反应器的性能以及保留的产甲烷活性行为污泥，实验室规模的 UASB 反应器通过在高温条件下（55℃）进料酒精蒸馏废物运行了大约 2 年。该反应器接种了从接收碳水化合物（主要是果汁）的 UASB 反应器中收获的中温生长的颗粒污泥。新型高温UASB反应器具有多级气固分离器，具有较低的SVI和良好的截留稳定性。由于形成了易于沉降的高活性颗粒污泥，反应器最终允许体积有机负荷达到 100kgCOD/m3/天，COD 去除效率约为 85-90%。截留污泥最终达到 2.9g COD/g VSS/d，醋酸盐为 0.69g COD/g丙酸盐的 VSS/d 和氢气的 16.2g COD/g VSS/d 与其他热营养组相比，丙酸盐喂养的产甲烷活性值较低，表明丙酸盐分解主要是限速步骤。在高温甲烷发酵过程中。