Contribution of precipitates formed in fermentation liquor to the enhanced biogasification of ammonia-rich swine manure by wheat-rice-stone addition
Contribution of precipitates formed in fermentation liquor to the enhanced biogasification of ammonia-rich swine manure by wheat-rice-stone addition
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DOI：
10.1016/j.biortech.2014.10.142
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发表时间：
2015-01-01
影响因子：
11.4
通讯作者：
Zhang, Zhenya
中科院分区：
文献类型：
--
作者：
Huang, He;He, Leilei;Zhang, Zhenya
研究了在高氨氮水平（5145 mg-N/L）下，添加小麦米石（WRS）对猪粪中温厌氧发酵产甲烷的影响，并探讨了其可能的机制。结果表明，添加WRS不仅能使产甲烷量从对照的82.8 ml/g-VS提高到142.7 ml/g-VS，提高了72%，而且能显著缩短有效沼气期，从对照的40 d缩短到20 d。此外，添加WRS可以促进n-HBu的降解，减缓其他挥发性脂肪酸（VFAs）的积累，提高VFAs的利用率和维持pH的能力。更具体地说，存在和释放的离子特别是Ca2+、Mg2+和Fe3+/2+与发酵液中丰富的NH4+和PO43形成沉淀（如鸟粪石和铁沉淀），可能是WRS添加下氨浓度降低和生物气化增强的重要原因。(C) 2014 Elsevier Ltd.版权所有。
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 (5145 mg-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 142.7 ml/g-VS but also remarkably shorten the effective biogasification period from 40 (control) to 20 days. 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 Ca2+, Mg2+, and Fe3+/2+ were supposed to form precipitates (like struvite and Fe-precipitates) with NH4+ and PO43 rich in the fermentation liquor, probably contributing a lot to the decreased ammonia concentration and enhanced biogasification under WRS addition. (C) 2014 Elsevier Ltd. All rights reserved.