title: Effect of different struvite crystallization methods on gaseous emission and the comprehensive comparison during the composting.
abstract: This study compared 4 different struvite crystallization process (SCP) during the composting of pig feces. Four combinations of magnesium and phosphate salts (H3PO4+MgO (PMO), KH2PO4+MgSO4 (KPM), Ca(H2PO4)2+MgSO4 (CaPM), H3PO4+MgSO4 (PMS)) were assessed and were also compared to a control group (CK) without additives. The magnesium and phosphate salts were all supplemented at a level equivalent to 15% of the initial nitrogen content on a molar basis. The SCP significantly reduced NH3 emission by 50.7-81.8%, but not the N2O. Although PMS group had the lowest NH3 emission rate, the PMO treatment had the highest struvite content in the end product. The addition of sulphate decreased CH4 emission by 60.8-74.6%. The CaPM treatment significantly decreased NH3 (59.2%) and CH4 (64.9%) emission and yielded compost that was completely matured. Due to its effective performance and low cost, the CaPM was suggested to be used in practice.
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China; College of Resources and Environment Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors.forename: Xuguang
authors.initials: X
authors.lastname: Ma
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Tang
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Yi
authors.affiliation: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors.forename: Maoxia
authors.initials: M
authors.lastname: Chen
authors.affiliation: College of Resources and Environment Sciences, China Agricultural University, Beijing 100193, China. Electronic address: composting@163.com.
authors.forename: Guoxue
authors.initials: G
authors.lastname: Li
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000737:chemistry; D000818:Animals; D003460:Crystallization; D005740:Gases / Q000032:analysis / Q000737:chemistry; D008372:Manure; D012987:Soil / Q000737:chemistry*; D000069877:Struvite / Q000032:analysis / Q000737:chemistry; D013552:Swine
chemical_list: D005740:Gases; D008372:Manure; D012987:Soil; D000641:Ammonia; D000069877:Struvite
keywords: Ammonia; Composting; Methane; Nitrous oxide; Struvite