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.

迄今为止构建的所有实用规模的UASB工艺都采用了嗜嗜或环境温度条件。目前，除了一个演示尺度的过程外，目前尚无嗜热UASB过程。与嗜热过程相比，阻碍嗜热UASB过程的妨碍传播的主要原因之一可能是颗粒形成的可靠性或更低的可靠性。（55 c）。将反应堆接种了从接收碳水化合物（主要是果汁）废水的UASB反应器收获的粒细胞生长的污泥。新型的嗜热UASB反应器具有多阶段气体固体分离器导致低SVI和良好的固定污泥的稳定性。由于建立了可安装良好的高活动性颗粒污泥的结果，反应器最终允许100kgcod/m3/day的体积有机负载，COD去除效率约为85-90％。保留污泥的甲烷剂活性最终达到2.9g COD/G VSS/D的乙酸盐，丙酸酯的0.69G COD/G VSS/D，氢的含量为16.2g COD/G VSS/D。与其他热营养基团相比，丙酸酯喂养的甲烷剂活性的低值表明，促进性分解主要是嗜热甲烷发酵过程的限制性步骤。