发明名称 |
Process for biological treatment of organic wastewater and apparatus therefor |
摘要 |
A multistage activated sludge process involving a predation effect caused by microorganisms realizes further improvement in treatment efficiency and further decrease in the amount of excess sludge generated while a stable quality of the treated water is maintained. This process includes a first biological treatment process for treating BOD in organic wastewater at a high load to convert the BOD to dispersed bacteria, and a second biological treatment process for forming the converted dispersed bacteria into a floc and allowing microorganisms to coexist. The second biological treatment process is performed under a condition of pH 5 to 6. Alternatively, an excess sludge treatment process for decomposing at least a part of sludge in the second biological treatment process and/or sludge obtained by performing solid-liquid separation of sludge in the second biological treatment process under aerobic conditions, and returning the treated sludge to the first biological treatment process and/or the second biological treatment process is performed under a condition of pH 5 to 6.
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申请公布号 |
US7332084(B2) |
申请公布日期 |
2008.02.19 |
申请号 |
US20060485429 |
申请日期 |
2006.07.13 |
申请人 |
KURITA WATER INDUSTRIES, LTD. |
发明人 |
FUJISHIMA SHIGEKI;YODA MOTOYUKI |
分类号 |
C02F3/30;C02F1/44;C02F3/08;C02F3/12;C02F11/02 |
主分类号 |
C02F3/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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