title: Combined use of nitrification inhibitor and struvite crystallization to reduce the NH3 and N2O emissions during composting.
abstract: Struvite crystallization (SCP) is combined with a nitrification inhibitor (dicyandiamide, DCD) to mitigate the NH3 and N2O emission during composting. The MgO and H3PO4 were added at a rate of 15% (mole/mole) of initial nitrogen, and the DCD was added at rates of 0%, 2.5%, 5.0%, 7.5% and 10% (w/w) of initial nitrogen respectively. Results showed that the combination use of SCP and DCD was phytotoxin free. The SCP could significantly reduce NH3 losses by 45-53%, but not the DCD. The DCD significantly inhibits nitrification when the content was higher than 50mgkg(-1), and that could reduce the N2O emission by 76.1-77.6%. The DCD degraded fast during the thermophilic phase, as the nitrification will be inhibited by the high temperature and high free ammonia content in this stage, the DCD was suggested to be applied in the maturing periods by 2.5% of initial nitrogen.
authors: College of Chemistry, Leshan Normal University, Leshan 614004, China; College of Resources and Environment Sciences, China Agricultural University, Beijing 100193, China.
authors: Tao
authors: T
authors: Jiang
authors: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors: Xuguang
authors: X
authors: Ma
authors: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors: Qiong
authors: Q
authors: Tang
authors: College of Chemistry, Leshan Normal University, Leshan 614004, China.
authors: Juan
authors: J
authors: Yang
authors: College of Resources and Environment Sciences, China Agricultural University, Beijing 100193, China. Electronic address: composting@163.com.
authors: Guoxue
authors: G
authors: Li
authors: Johann Heinrich von Thuenen-Institute, Institute of Agricultural Technology and Biosystems Engineering, Bundesallee 50, 38116 Braunschweig, Germany.
authors: Frank
authors: F
authors: Schuchardt
mesh_terms: D000641:Ammonia / Q000737:chemistry / Q000378:metabolism; D003460:Crystallization; D006146:Guanidines / Q000494:pharmacology*; D058465:Nitrification / Q000187:drug effects; D009609:Nitrous Oxide / Q000737:chemistry / Q000378:metabolism; D012987:Soil / Q000737:chemistry*; D000069877:Struvite / Q000737:chemistry / Q000378:metabolism
chemical_list: D006146:Guanidines; D012987:Soil; D000641:Ammonia; D000069877:Struvite; D009609:Nitrous Oxide; C004711:dicyandiamido
keywords: Ammonia; Composting; Dicyandiamide; Nitrous oxide; Struvite