摘要
为研究总氨氮(TAN)在餐厨垃圾中温干式厌氧消化系统内的积累及抑制作用,在单相完全搅拌式(CSTR)反应器内进行餐厨垃圾中温厌氧消化,反应器在3 g·L-1·d-1(以VS计)的负荷下连续运行230余天,期间不断监测TAN及其余物化指标的变化.试验结果表明,TAN在系统内的积累呈现先快后慢的趋势,且不会持续积累,而是积累到一定程度后会保持稳定.游离氨(FAN)是氨抑制中起主导作用的因素,FAN大于150 mg·L-1时就会影响到系统效率;大于200 mg·L-1时会影响系统稳定性;大于300 mg·L-1后会产生强烈抑制,引发稳态型抑制,甚至导致系统出现泡沫.此外,氨抑制会影响系统产气动力学,导致产气速率降低,产气量减少.寻找合理的措施消除氨抑制对保障系统稳定运行具有重要意义.
To investigate the accumulation and inhibition of ammonia during the dry anaerobic digestion of food waste（FW）, a completely stirred tank reactor（CSTR） was set up to treat FW at mesophilic temperature. The reactor was operated for about 230 days at an organic loading rate（ OLR） of 3 g VS·L-1·d-1, and ammonia and a few other physical and chemical parameters were monitored periodically. The results show that the accumulation of ammonia in the reactor occurred quickly at the early stage and then slowed down and finally the total ammonia nitrogen（TAN） concentration maintained at a stable level. Free ammonia nitrogen（FAN） is considered as the main inhibitory factor. FAN higher than 150 mg·L-1 started to affect the efficiency,while FAN greater than 200 mg·L-1 harmed the process stability. Strong inhibition occurred when FAN was greater than 300 mg·L-1, resulting in foam formation. Besides, gas production dynamics were also negatively affected by ammonia, resulting in the lower gas production rate and reduced gas production. It is therefore important to control and eliminate the ammonia inhibition to ensure the stable operation of AD of FW.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第1期210-216,共7页
Acta Scientiae Circumstantiae
基金
"十一五"国家科技支撑计划重点项目(No.2010BAC67B01)
重庆市科技计划重点项目~~
关键词
餐厨垃圾
厌氧消化
总氨氮积累
氨抑制
food waste
anaerobic digestion
ammonia accumulation
ammonia inhibition
