Hybrid Wastewater Treatment System for Water Reuse and P Recovery

用于水回用和磷回收的混合废水处理系统

基本信息

批准号：
08458160
负责人：
WATANABE Yoshimasa
金额：
$ 3.97万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

1) This research dealt with the coagulation characteristics of polysilicato-iron (PSI), a new inorganic polymer coagulant, when it was applied to coagulate algae and municipal wastewater. The experimental results obtained with jar tests indicate that PSI was more effective than PAC and AS in coagulating and separating Microcystis sp. and Stephanodiscus sp. When the jet mixed separator (JMS) was used as a unit of simultaneous flocculation and sedimentation, PSI had almost the same effect as PAC at the same dosage of 5 mg/l Al or Fe in coagulating municipal wastewater.2) This research has developed a novel membrane process in which ammonia oxidizers are fixed en the membrane disk. In this study, the characteristics of the membrane filtration resistance was investigated The results derived from this study were summarized as follows : (1) The magnitude of the filtration resistance was strongly affected by the initial inoculation. (2) The filtration resistance due to the accumulate cake was … More found to be dominant. (3) Increasing the disk rotational speed was found to be efficient for removing cake. About 3000 hours of the operation could be continued by only implementing this simple cleaning method every 500 hours. (4) Filtration resistance excluding the cake resistance seemed to be caused by humic substances and extracellular polymeric substance produced by biomass.3) The density of ammonia-oxidizers which formed dense cell cluster was about 5 times higher in the innermost biofilm than in the middle and surface of the biofilm. Due to the presence of ammonia-oxidizers throughout the biofilm, ammonium oxidation zone was expanded with increasing in oxygen penetration depth, which consequently resulted in an increase of the overall ammonium flux into the biofilm. Specific ammonium oxidation rate was dependent upon the density of ammonia-oxidizers.4) Phosphorus deficiency induces the synthesis of acid phosphatases in roots of lupin and other plant species. In this study we examined the induction of secretory acid phosphatase (S-Apase) at both the molecular and cellular levels. Lupin plants had increased levels of total acid phosphatase activity within two to five days after P was withered and levels approximately doubled by 15 days. Lateral roots and not main taproots were responsible for this increase in acid phosphatase activity. Immunoblot analysis using antibodies raised against a purified S-Apase showed that the synthesis of this protein was induced as early as 2 days in the P deficient treatment and that levels dramatically increased by 15 days. In contrast, no immunoreactive polypeptide was evident from crude extracts prepared from root tissues of-P treated plants. Less

1）STH的凝血特性（PSI）是一种新的无机聚合物凝结剂晚期藻类和市政废水，这表明使用JAR测试获得的实验结果表明，与凝结和分离微细胞SP的pac Pac更有效。和Stephanodiscus sp。psi的效果几乎与PAC相同的剂量在5 mg/l al或或Fe的凝血中，在凝结市政废水中。 EN膜盘。发现更多的蛋糕。由于在整个生物膜中存在氨 - 氧化剂，形成的氨基化剂的氨基化剂比膜高约5倍。在生物膜中，总体铵升高依赖于卢平和其他T物种中的酸性磷酸化的缺陷。在降低了P的五天内，总酸性磷酸酶的速度降低了，并且横向根大约增加了一倍。在几天内，几天内的几天诱导了2天，从而使水平急剧增加15天