氧化還原電位ORP在污水處理中的用途
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如ORP值低，表明廢水處理系統(tǒng)中還原性物質(zhì)或有機污染物含量高，溶解氧濃度低，還原環(huán)境占優(yōu)。
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如ORP值高，表明廢水中有機污染物濃度低，溶解氧或氧化性物質(zhì)濃度高，氧化環(huán)境占優(yōu)。
通過監(jiān)測和管理污水的ORP，管理人員可人為地控制生物反應(yīng)發(fā)生。通過改變工藝運行的環(huán)境條件，如：
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加大曝氣量增加溶解氧濃度
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投加氧化性物質(zhì)等措施提高氧化還原電位
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減小曝氣量降低溶解氧濃度
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投加碳源和還原性物質(zhì)降低氧化還原電位，從而實現(xiàn)促進或阻止該反應(yīng)的進行。
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一是在厭氧環(huán)境下磷的釋放階段，發(fā)酵菌在ORP在-100～-225mV的條件下產(chǎn)生脂肪酸，脂肪酸通過聚磷菌吸收，同時釋放磷進入水體中。
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二是在好氧池內(nèi)聚磷菌開始降解上階段吸收的脂肪酸同時從ATP轉(zhuǎn)化成ADP獲得能量，這種能量的儲存需要從水中吸附過量的磷，吸附磷的反應(yīng)要求好氧池內(nèi)的ORP為+25～+250mV 之間，才能發(fā)生生物除磷的存儲。
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