镍对厌氧消化过程的抑制作用研究

采用混合式厌氧反应器，以酒糟废水为基质，在相同条件的不同反应器中每日加入不同浓度的镍离子（以硝酸镍形式加入），研究不同浓度的镍离子对厌氧体系的抑制作用，以及体系中溶解态的镍离子含量与抑制程度的关系。结果表明，日加入镍量低于３６．４ｍｇ／Ｌ时，对体系无影响；在４０－６０ｍｇ／Ｌ时，产生轻微的抑制；超过８０ｍｇ／Ｌ时，对体系造成严重的抑制。当体系中溶解态镍离子浓度低于２．５ｍｇ／Ｌ时，体系不受影响。厌

Inhibition of Nickel to the Anaerobic Digestion

The inhibition of nickel ion to anaerobic digestion was described in this paper. Nickel ion was added at different concentrations in three experimental digesters. No inhibition effect on the anaerobic system was observed when daily addition of nickel to the digester was less than 36. 4 mg/L. When the daily addition of nickel was 40-60mg/L, or more than 80mg/ L, however, digestion system was inhibited significantly or seriously, respectively. Toxicity of nickel to anaerobic system was found to be dependent on the concentration of dissolved nickel ions in digester. The systemwas not affected when the concentration of dissolved nickel ion is less than 2. 5mg/ L. At the ratio of concentration of daily nickel addition to activated sludge (dry weight) being less than 0. 08(w/w), the digestion system would be normally running.