[Effect of municipal solid waste composting on availability of insoluble phosphate].

During municipal solid waste (MSW) composting, both organic acid production and sparingly soluble inorganic phosphate solubilization occur simultaneously. In this study, compost consisted of residual MSW with metal, plastic and glass removed, and sparingly soluble phosphate (ground rock phosphate) was mixed in municipal solid wastes composting. The effects of composting on soluhilization of sparingly soluble phosphate as well as the effects of compost production (P-enriched MSW compost) on soil rapidly available phosphorus were studied. Mixing ground rock phosphate into composting, rapidly available phosphorus increase at initial stage, achieved maximum at medium stage, and stabilize at final stage of MSW composting. At final stage of composting, the content of rapidly available phosphorus in treatment P1 and P2 increase respectively by 0.87 g x kg(-1), 0.76 g x kg(-1) compared with that with no mixing ground rock phosphate. Scanning electron microscopy (SEM) reveals a number of cavities in ground rock phosphate surface. After compost products amended soil, the content of soil rapidly available phosphorus and acid phosphatase activity of P-enriched MSW compost amendment increase obviously compared with MSW compost, chicken manure compost, and chemical fertilizer amendment during crop duration.