Cu^（2＋）Zn^（2＋）Ni^（2＋）Cr^（3＋）对皮革废水厌氧消化抑制作用的研究

INHIBITORY EFFECT OF Cu￣(2+)Zn￣(2+)Ni(2+)Cr￣(3+) ON ANAEROBIC DIGESTION IN TANNERY WASTE WATER

系统地研究了Ｃｕ２＋、Ｚｎ２＋、Ｎｉ２＋和Ｃｒ３＋四种金属离子加入浓度、溶解态离子浓度与皮革废水厌氧消化产气量的关系，其毒性大小的顺序为Ｃｒ３＋＞Ｎｉ２＋＞Ｃｕ２＋＞Ｚｎ２＋，提出维持正常厌氧消化时体系中溶解态离子浓度的上限，为厌氧生物处理皮革废水的实际应用提供了一定的科学依据。

n this paper the relation between adding concentrations of dissolved. metal ions of Cu2+. Zn2+. Ni2+ and Cr3+ and gas production in tannery waste water treated with anaerobes has been systematically studied. It determined the order of their toxicity: Cr3+>Ni2+>Cu2+>Zn2+. and indicated the upper limit of dissolved ionic concentration for maintaining normal anaerobic digestion. providing a theoretical basis for practical application of anaerobic technology in the treatment of tannery waste water.