[Influence of different sorbents on adsorption effect of ammonia and compost property in aerobic composting].

The three kinds of sorbents of 0.18% KH2PO4, 0.06% KH2PO4 + 15% sawdust mixture and 30% sawdust are added separately into composting to investigate their adsorption effect on ammonia. The experiment results exhibite that all the sorbents can restrain ammonia volatilizing. But sorption of 0.18% KH2PO4 sorbnet was best of all, one of 0.06% KH2PO4 + 15% sawdust mixture sorbent was secondly, one of 30% sawdust sorbent was thirdly. The total nitrogen loss ratios were separately reduced 25%, 23% and 17% after adding the three kinds of sorbents into composting. However, excessive KH2PO4 would produce negative influence on compost property, such as pH value being lessened, microorganism activity being reduced, and finally resulting in the reduction of biodegradation ratio of organic matter also. Comparing with it, there were not these problems as 0.06% KH2PO4 + 15% sawdust mixture being sorbent. The mixture sorbent not only produced finer adsorption effect on ammonia, but also made biodegradation ratio of organic matter to be promoted 7%.