[Application of struvite crystallization on co-composting of swine manure and cornstalk].
Aimed at controlling the nitrogen loss caused by the ammonia gas emission during composting, the mixtures of magnesium hydroxide [Mg(OH)2] and phosphoric acid (H3PO4) were added into composting materials of swine manure and cornstalk. After 26 d composting, ammonical nitrogen and total nitrogen were improved obviously,which were 10.7 g x kg(-1) and 36.9 g x kg(-1) respectively in amended treatment (B), while they were 7.7 g x kg(-1) and 26.8 g x kg(-1) in un-amended trial. By analysis of the total organic carbon, t suggested that amendments accelerated the degradation of organic matter, germination index test showed the maturity of trial B(96%) was better than trial A(82%) in final compost. The scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analysis confirmed the existence of struvite (MgNH4PO4 x 6H2O). These results indicated that Mg (OH)2 and H3PO4 could accelerate the degradation of organic matter, and reduce the ammonia emission by struvite crystallization reaction.
College of Resource and Environmental Science, China Agricultural University, Beijing 100194, China. aomei386@yahoo.com.cn
Li-Mei
LM
Ren
Guo-Xue
GX
Li
Yu-Jun
YJ
Shen
Chun-Ping
CP
Li
Rui
R
Guo
D000818:Animals; D001673:Biodegradation, Environmental; D003246:Conservation of Energy Resources / Q000379:methods; D003460:Crystallization; D017616:Magnesium Compounds; D008276:Magnesium Hydroxide / Q000737:chemistry; D008372:Manure; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D010710:Phosphates; D010756:Phosphoric Acids / Q000737:chemistry; D018547:Plant Stems / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D000069877:Struvite; D013552:Swine; D003313:Zea mays / Q000254:growth & development
D017616:Magnesium Compounds; D008372:Manure; D010710:Phosphates; D010756:Phosphoric Acids; D000069877:Struvite; D009584:Nitrogen; D008276:Magnesium Hydroxide