| 摘要 |
PURPOSE:To conserve a neutralizing agent and to enhance treatment efficiency, by a method wherein dum muddy water is mixed with bank waste water having high alkalinity to neutralize the latter while a flocculant is added to the supernatant liquid formed after coarse particulate mud in the liquid mixture is separated by precipitation to separate the same into sludge and treated water. CONSTITUTION:Dum muddy water and bank waste water are simultaneously flowed into a water storage tank 20 and the high alkali component in the bank waste water is subjected to ion exchange and neutralizing reaction due to various minerals in the dum muddy water not only to neutralize the bank waste water but also to perform precipitative separation of coarse particulate soil in the water mixture. The supernatant liquid overflowed from the water storage tank 20 is sent to a cyclone 21 in a predetermined amount by a pump to separate particulate soil therein. PAC and an org. anionic high molecular agent are added to the water mixture flowed into a reaction tank 23 as flocculant while the water mixture having flocs formed therein is sent into an inclined plate precipitation tank 24 and separated into sludge and treated water. The greater part of the supernatant liquid in the precipitation tank 24 is refluxed to an aggregate producing plant to be reutilized.
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