发明名称 |
Method of treating waste waters containing solid-phase difficultly-soluble compounds |
摘要 |
A method is provided for treating waste water containing solids of difficultly-soluble compounds of at least one heavy metal, the method comprising the steps of adding an amount of ferrous ions to said waste water corresponding on a molar basis to about 2 to 100 times the total molar amount of heavy metal present in said waste water, adding an alkaline substance to said waste water in an amount corresponding to about 0.9 to 1.2 equivalent of free acid present in said waste water, and stirring the waste water without aeration at a temperature of at least about 40 DEG C., whereby insoluble ferrite crystals are precipitated having said heavy metal incorporated therein.
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申请公布号 |
US4169053(A) |
申请公布日期 |
1979.09.25 |
申请号 |
US19780866416 |
申请日期 |
1978.01.03 |
申请人 |
NIPPON ELECTRIC CO., LTD. |
发明人 |
SAKAKIBARA, NAOTAKA;OHNO, SHIGERU;SHIMIZU, SHIGEKI |
分类号 |
C02F1/52;(IPC1-7):C02B1/20;C02C5/02 |
主分类号 |
C02F1/52 |
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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