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图7 中和混凝絮凝废水沉降情况
(a) 沉降1 min状态;(b) 沉降5 min状态NaOH、Ca(OH)2 (a1,b1),附加PAC (a2,b2),附加CPAM (a3,b3),附加PAC与CPAM (a4,b4)