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The Study of Pb(Ⅱ) in the Waste Water by Chemical Trapping and Flocculating Settlement

Shen you-liang,Ou yang-meng,Nie jI-lan (Chemistry Department of Nanchang University,Nanchang Jiangxi,330047)  
Lead were trapped by DDTC in the wastewater,and were flocculated by composite flocculate PAM/alum,it get a good result.When the pH value was changed to 6.0,the removal ratio of lead reached 98%,with the optimization dosage of the composite flocculation on the room temperature. The consistency of lead were reduced to 1.0mg/L,it fit for the GB8978-1996.In this condnions,the bigger and stronger flocculation were produced,and it can subsided fast,the settlement time of the flocculation was about thirties minutes.
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