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闭路循环治理基本上是自然沉降和空气氧化相结合的方法。与其它厂不同的地方就是在二沉淀池(或叫自沉池)后面增设壹只玻璃钢凉水塔,强制自二沉池出来的含磷废水再行氧化,效果特别显著。自黄磷车间排出的废水pH为4~4.5,含元素磷80~200毫克/升,经过治理后废水含元素磷0.2~0.5毫克/升,pH为6左右,可继续使用。
Closed-loop recycling is basically a combination of natural sedimentation and air oxidation. Different from other factories is the addition of a glass-fiber reinforced plastic cooling water tower behind the secondary sedimentation tank (or self-sinking tank), which forces the phosphorus-containing wastewater from the secondary sedimentation tank to oxidize again. The effect is particularly notable. Wastewater discharged from the yellow phosphorus workshop has a pH value of 4 to 4.5 and contains 80 to 200 mg / l of elemental phosphorus. After treatment, the wastewater contains 0.2 to 0.5 mg / l of elemental phosphorus and has a pH of about 6 and can be used continuously.