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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.

到目前为止，所有实际规模的UASB工艺都采用了中温或环境温度条件。除了一个示范规模的工艺外，目前还没有运行的亲热性UASB工艺。与中温过程相比，阻碍嗜热性UASB过程传播的主要原因之一可能是颗粒形成的困难或可靠性较低。为了研究新开发的热敏UASB反应器的性能和保留污泥的产甲烷活性，在实验室规模的UASB反应器中，以酒精蒸馏废液为原料，在55ºC的高温条件下运行了大约2年。反应器接种了从UASB反应器中收获的中温生长的颗粒污泥，该反应器接收碳水化合物（主要是果汁）废水。采用多级气固分离器的新型热敏UASB反应器具有较低的SVI和较好的保留颗粒污泥稳定性。由于建立了易沉降、高活性的颗粒污泥，该反应器最终允许100kgCOD/m3/天的体积有机负荷，COD去除效率约为85-90%。保留污泥的产甲烷活性最终达到乙酸2.9g COD/g VSS/d，丙酸0.69g COD/g VSS/d，氢16.2g COD/g VSS/d。与其他热养菌群相比，以丙酸为饲料的产甲烷活性较低，表明丙酸分解在嗜热甲烷发酵过程中主要是一个限速步骤。