Anaerobic digestion of swine manure: Inhibition by ammonia
Anaerobic digestion of swine manure: Inhibition by ammonia
复制标题
DOI：
10.1016/s0043-1354(97)00201-7
复制
发表时间：
1998-01-01
期刊：
影响因子：
12.8
通讯作者：
Ahring, BK
中科院分区：
文献类型：
--
作者：
Hansen, KH;Angelidaki, I;Ahring, BK
在连续搅拌槽式反应器中，在4种不同温度下，获得了氨浓度为6 g-N/l、水力停留时间为15 d的猪粪稳定厌氧降解效果。在37、45、55和60℃条件下，甲烷产率分别为188、141、67和22 ml-CH4/g-VS。其产量显著低于使用猪粪的潜在沼气产量（300 ml-CH4/g-VS）。当游离氨浓度为1.1 g-N/升或更高时，在pH为8.0（反应器pH）的间歇培养中发现抑制作用，较高的游离氨浓度导致表观比生长率下降。以不同猪粪与牛粪混合进行的批量试验表明，当猪粪与牛粪的比例高于25:75时，对应的游离氨浓度约为1.1 g-N/l，沼气过程受到抑制。抑制沼气过程并因此减少甲烷产量遵循四个阶段模式：低于1.1 g-N/升游离氨的阈值，该过程不受抑制；在此浓度下，抑制发生，首先形成一个初始抑制阶段，然后是平台期，然后是表观比生长率随着游离氨浓度的增加而下降的抑制阶段。1998爱思唯尔科学有限公司版权所有。
A stable anaerobic degradation of swine manure with ammonia concentration of 6 g-N/litre was obtained in continuously stirred tank reactors with a hydraulic retention time of 15 days, at Four different temperatures. Methane yields of 188, 141, 67 and 22 ml-CH4/g-VS were obtained at 37, 45, 55 and 60 degrees C, respectively. The yields were significantly lower than the potential biogas yield of the swine manure used (300 ml-CH4/g-VS). A free ammonia concentration of 1.1 g-N/litre or more was found to cause inhibition in batch cultures at pH 8.0 (reactor pH), and higher free ammonia concentrations resulted in a decreased apparent specific growth rate. Batch experiments with various mixtures of swine and cattle manure showed that the biogas process was inhibited when the swine-to-cattle manure ratio was higher than 25:75, corresponding to a free ammonia concentration of approximately 1.1 g-N/litre. Inhibition of the biogas process and, thereby, a reduction of the methane yield followed a four-stage pattern: below a threshold of 1.1 g-N/litre free ammonia, the process was uninhibited; over this concentration, inhibition occurred, forming first a phase with an initial inhibition, then a plateau and then an inhibition stage where the apparent specific growth rate decreased with increasing concentrations of free ammonia. (C) 1998 Elsevier Science Ltd. All rights reserved.