The Experimental of Preparation of Slow-release Trace Ni~(2+) Ceramsite and Study About Influence of Wastewater Anaerobic Treatment

摘要

Using fly ash, cement, lime, gypsum as main raw material, CaCl_2, Na_2SO_4 and NaCl as activating agent, using steam curing method, the strength of ceramsite as main indicator, by orthogonal experiment to determine the best proportion of raw material, discussing the release process of trace metals element of ceramsite. Through contrast test with the blank group, commodity ceramsite group, homemade common ceramsite group, only adding Ni~(2+) group and slow-release Ni~(2+) ceramsite group in the microbial reactor can obtain: the removal rate of COD is 66.84%, 74.95%, 80.63%, 82.63% and 91.79% respectively, removal rate of adding modification ceramsite is the peak, 24.95% higher than blank group, 16.84% higher than adding Ni~(2+) group. Slow-release ceramsite can significantly increase the activity of activated sludge, comparing with other ceramsite and adding trace metal element directly, which has more superior process performance.