title: Use of potassium dihydrogen phosphate and sawdust as adsorbents of ammoniacal nitrogen in aerobic composting process.
abstract: Three kinds of adsorbents-potassium dihydrogen phosphate, sawdust and mixture of potassium dihydrogen phosphate and sawdust were added respectively into composting to investigate their adsorption effect on ammonia. The experimental results showed that all the adsorbents could restrain ammonia volatilizing, with the sorption of potassium dihydrogen phosphate adsorbents being the best of all, the sorption of mixture adsorbent with potassium dihydrogen phosphate and sawdust being the second and the sorption of sawdust adsorbent being the last. Therefore, the total nitrogen loss ratios respectively reduced from 38% to 13%, 15% and 21% after adding these three kinds of adsorbents into composting. However, potassium dihydrogen phosphate produced negative influence on composting properties as its supplemented amount exceeded a quantity basis equivalent to 18% of total nitrogen in the composting, for example: pH value had been lessened, microorganism activity reduced, which finally resulted in the reduction of biodegradation ratio of organic matter. But it did not result in these problems when using the mixture of potassium dihydrogen phosphate and sawdust as adsorbent, in which the amount of potassium dihydrogen phosphate was under a quantity basis equivalent to 6% of total nitrogen in the composting. Moreover, the mixture adsorbent produced better adsorption effect on ammonia, and raised biodegradation ratio of organic matter from 26% to 33%.
authors.affiliation: Department of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
authors.forename: Tian-Jue
authors.initials: TJ
authors.lastname: Hu
authors.forename: Guang-Ming
authors.initials: GM
authors.lastname: Zeng
authors.forename: Dan-Lian
authors.initials: DL
authors.lastname: Huang
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Yu
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Jiang
authors.forename: Fang
authors.initials: F
authors.lastname: Dai
authors.forename: Guo-He
authors.initials: GH
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D000332:Aerobiosis; D000641:Ammonia / Q000737:chemistry*; D019149:Bioreactors; D004391:Dust; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism; D010710:Phosphates / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil; D014934:Wood
chemical_list: D004391:Dust; D010710:Phosphates; D017680:Potassium Compounds; D012987:Soil; D000641:Ammonia; C013216:potassium phosphate; D009584:Nitrogen