利用新型高温好氧堆肥器提高鸡粪谷壳有机肥肥效

In view of the problems of long composting time and serious environmental pollution in traditional composting device, the development of rapid, odorless and environmentally-friendly composting device is great significance for promoting livestock manure into organic fertilizer. The new high-temperature aerobic composting device mainly included four parts: control panel, fermenter (50 L active volume), and air compressor ventilation system (0.15 m³·s⁻¹ discharge capacity and 40 L gas tank capacity), ammonia absorption system (188 L volume, patterns of internal ladder ring absorption), which was used to produce chicken manure-rice chaff organic fertilizer. The fertilizer efficiency of recovered magnesium ammonium phosphate (r-MAP) in chicken manure-rice chaff organic fertilizer was investigated by pot experiments. Under the optimal conditions for 40 d composting of chicken manure and rice chaff (C/N=25), the products showed the black odorless, no harmful flora, and spherical features. Moreover, the nutrients of products were 50.53% organic matter, 1.86% TN, 1.56% TP (P₂O₅), 1.59% TK (K₂O), which basically met the national organic fertilizer (NY525-2012). The yield and polysaccharide content of water spinach obtained from chicken manure and rice chaff organic fertilizer were higher than that of chemical fertilizer. The recovery of magnesium ammonium phosphate (MAP) from ammonia recovery system could effectively improve the overall fertilizer efficiency of organic fertilizer. The results will provide a theoretical basis for the further popularization and application of the new high temperature aerobic composting device.