摘要
文章对西安市2018年夏季6月~8月份生活垃圾样品进行了成分分析并取其中厨余类垃圾进行了中温厌氧发酵试验。成分分析表明,西安市夏季生活垃圾的含水量较高,均在50%以上,且厨余园林类垃圾所占比重最大。从化学成分分析来看,以碳水化合物比例最高。在随后的产甲烷测试中,第5批次样品(8月14日)的垃圾有机部分产甲烷量最高,达到了1014.24 mL,从原料角度分析是因为其C/N最接近于厌氧发酵的理想状态(1∶25)。对第五批次垃圾按照总固体浓度(TS)梯度分为高浓度组(TS 9%)、中浓度组(TS 6.5%)和低浓度组(TS 4%)进行厌氧发酵产甲烷测试,结果表明:中浓度组的产甲烷潜力25.68 mL·g-1 TS高于低浓度组的25.24 mL·g-1 TS和高浓度组的3.94 mL·g-1 TS。在随后的料液分析中表明,在厌氧发酵结束后的中低浓度组的挥发性固体(VS)去除率均高于50%,而高浓度组的VS去除率低于20%,与此同时,高浓度组的总挥发性有机酸(VFAs)浓度达到了20 g·L-1,高于低浓度组(9.8 g·L-1)和中浓度组(6.9 g·L-1),而低、中、高3组的氨氮累积量均低于2 g·L-1,这说明了VFAs的积累是导致高浓度组产甲烷量低的主要原因。对第5批次垃圾样品3个浓度组的累积产甲烷量进行Gomperz动力学模拟,发现其拟合优度R 2均大于0.99,说明利用Gomperz模型可以很好地预测有机垃圾在存在酸抑制状态下的产甲烷规律。
In this paper,the composition of household waste samples from June to August 2018 in Xi an city was analyzed,and kitchen waste was taken for medium temperature anaerobic fermentation test.The composition analysis showed that the water content of household garbage in summer was higher than 50%,kitchen waste and garden garbage accounted for the largest proportion of garbage.From the chemical composition analysis,the carbohydrate was the highest.For methane production test of organic garbage,the sample taking on 14 August produced the highest methane,reaching 1014.24 mL,suggesting that might be due to the closest to the ideal C/N(1∶25).The garbage sample taking on 14 August was tested for anaerobic fermentation with high solid concentration(TS 9%),medium solid concentration(TS 6.5%)and low solid concentration(TS 4%),respectively.The results showed that the medium concentration group obtained the higher methane production potential of 25.68 mL·g-1 TS than that of low concentration group of 25.24 mL·g-1 TS and high concentration group of 3.94 mL·g-1 TS.After the end of anaerobic fermentation,the analysis of fermentation liquid showed that the VS removal rate in the medium and low concentration group were higher than 50%,while the VS removal rate in the high concentration group was lower than 20%.Meanwhile,the concentration of total volatile organic acid(VFAs)in the high concentration group reached 20 g·L-1,higher than that of low concentration group(9.8 g·L-1)and the medium concentration group(6.9 g·L-1),and the accumulation of ammonia nitrogen in the low,medium and high groups was all lower than 2 g·L-1,indicating that the accumulation of VFAs was the main cause for the low methane production in the high concentration group.Gomperz kinetics simulation was carried out for the cumulative methane production in the three concentration groups,and it was found that the goodness-of-fit R 2 was all greater than 0.99,indicating that the Gomperz model could be used to predict the methane production of organic waste in
作者
刘禹
李欣鹏
陈秋宇
谭鹏
邱礼诚
邓媛方
王飞
姜娜
LIU Yu;LI Xin-peng;CHEN Qiu-yu;TAN Peng;QIU Li-cheng;DENG Yuan-fang;WANG Fei;JIANG Na(Powerchina Water Environment Governance,Shenzhen 518102,China;Northwest Research Center of Rural Energy Exploitation and Utilization of Minister of Agriculture,Yangling 712100,China;Biogas Institute of Ministry of Agriculture,Chengdu 610041,China)
出处
《中国沼气》
2019年第6期37-43,共7页
China Biogas
基金
中国电建集团重大科技专项资金(DJ-ZDZX-2016-03)
关键词
生活垃圾
成分分析
厌氧发酵
动力学模拟
municipal solid wastes
composition analysis
anaerobic fermentation
kinetics
