[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.
Ren
Li-Mei
LM
College of Resource and Environmental Science, China Agricultural University, Beijing 100194, China. aomei386@yahoo.com.cn
Li
Guo-Xue
GX
Shen
Yu-Jun
YJ
Li
Chun-Ping
CP
Guo
Rui
R
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