title: Contribution of precipitates formed in fermentation liquor to the enhanced biogasification of ammonia-rich swine manure by wheat-rice-stone addition.
abstract: This study investigated the effect of wheat-rice-stone (WRS) addition on mesophilic anaerobic fermentation for methane production from swine manure under high ammonia nitrogen level (5145mg-N/L) in addition to exploring its possible mechanisms involved. Results show that addition of WRS could not only effectively increase methane production by 72% from 82.8 (control) to 142.7ml/g-VS but also remarkably shorten the effective biogasification period from 40 (control) to 20days. In addition, WRS addition could promote the degradation of n-HBu and slow down the accumulation of other volatile fatty acids (VFAs) species, achieving much faster VFAs utilization rate and better pH maintaining capability. More specifically, the existing and released ions especially Ca(2+), Mg(2+), and Fe(3+/2+) were supposed to form precipitates (like struvite and Fe-precipitates) with NH4(+) and PO4(3-) rich in the fermentation liquor, probably contributing a lot to the decreased ammonia concentration and enhanced biogasification under WRS addition.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: He
authors.initials: H
authors.lastname: Huang
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Leilei
authors.initials: L
authors.lastname: He
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Zhongfang
authors.initials: Z
authors.lastname: Lei
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: zhang.zhenya.fu@u.tsukuba.ac.jp.
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000693:Anaerobiosis; D000818:Animals; D011232:Chemical Precipitation; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation; D005740:Gases / Q000378:metabolism*; D008372:Manure; D009584:Nitrogen / Q000378:metabolism; D012275:Oryza / Q000378:metabolism*; D013552:Swine / Q000378:metabolism; D014908:Triticum / Q000378:metabolism*
chemical_list: D005232:Fatty Acids, Volatile; D005740:Gases; D008372:Manure; D000641:Ammonia; D009584:Nitrogen
keywords: Anaerobic fermentation liquor; High ammonia concentration; Precipitation; Swine manure; Wheat-rice-stone (WRS)