污泥与餐厨垃圾共消化系统启动策略
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摘要
考察并对比分析了接种和不接种厌氧消化污泥时污泥与餐厨垃圾共消化系统的启动情况。结果表明:接种消化污泥的共消化系统从第13天开始稳定运行,对应的沼气平均日产量为32.8 L/d,甲烷含量达56%;而不接种消化污泥的系统未能成功启动,沼气平均日产量仅有0.4 L/d,甲烷含量占35%;运行结束时不接种消化污泥系统中短链脂肪酸(SCFAs)浓度高达6 703.8 mg/L,远高于接种消化污泥系统的34.9 mg/L;接种消化污泥的共消化系统pH为7.07～7.27,而不接种消化污泥系统的pH<6.50。因此,pH偏低是导致不接种消化污泥系统产气量少的主要原因,为了快速且成功启动污泥与餐厨垃圾共消化系统,有必要接种厌氧消化污泥。
Start-up conditions of sludge and kitchen waste co-digestion system inoculated with and without anaerobically digested sludge were investigated and compared in this research. Results showed that: the co-digestion system inoculated with digested sludge had been running steadily since the 13~(th) day, whose average daily output of biogas was 32.8 L/d and methane content was 56%; however, the system without digested sludge failed to start up, whose average daily production of biogas was only 0.4 L/d and methane content accounted for 35%; at the end of the running, the concentration of short-chain fatty acids(SCFAs) in the system without digested sludge was up to 6 703.8 mg/L, which was much higher than 34.9 mg/L of the system inoculated with digested sludge; the pH of the co-digestion system inoculated with digested sludge was 7.07～7.27, while pH of the system without digested sludge was less than 6.5. Therefore, low pH was the main cause for the low gas production in the system without digested sludge, and in order to start up the sludge and kitchen waste co-digestion system quickly and successfully, it is necessary to inoculate anaerobically digested sludge.
Start-up conditions of sludge and kitchen waste co-digestion system inoculated with and without anaerobically digested sludge were investigated and compared in this research. Results showed that: the co-digestion system inoculated with digested sludge had been running steadily since the 13~(th) day, whose average daily output of biogas was 32.8 L/d and methane content was 56%; however, the system without digested sludge failed to start up, whose average daily production of biogas was only 0.4 L/d and methane content accounted for 35%; at the end of the running, the concentration of short-chain fatty acids(SCFAs) in the system without digested sludge was up to 6 703.8 mg/L, which was much higher than 34.9 mg/L of the system inoculated with digested sludge; the pH of the co-digestion system inoculated with digested sludge was 7.07～7.27, while pH of the system without digested sludge was less than 6.5. Therefore, low pH was the main cause for the low gas production in the system without digested sludge, and in order to start up the sludge and kitchen waste co-digestion system quickly and successfully, it is necessary to inoculate anaerobically digested sludge.
引文
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[11] 王国华,王磊,谭学军, 等. 餐厨垃圾与污泥两相中温厌氧消化试验研究[J]. 净水技术,2014,33(1):54-57,71.
[12] 赵云飞,刘晓玲,李十中,等. 餐厨垃圾与污泥比例对联合发酵产沼气的影响[C]. 全国农村清洁能源与低碳技术学术研讨会论文集,2011:16-22.
[13] Xu R, Yang Z H, Zheng Y, et al. Depth-resolved microbial community analyses in the anaerobic co-digester of dewatered sewage sludge with food waste [J]. Bioresource Technology, 2017, 244:824-835.
[14] 苟成柳. 城市剩余活性污泥与餐厨垃圾混合厌氧消化特性研究[D].长沙: 湖南大学, 2014.
[2] Iacovidou E, Ohandja D, Voulvoulis N. Food waste co-digestion with sewage sludge-realising its potential in the UK [J]. Journal of Environmental Management, 2012, 112: 267-274.
[3] 王丹阳,弓爱军,张振星, 等. 北京市餐厨垃圾的处理现状及发展趋势[J]. 环境卫生工程, 2010, 18(1): 24-26.
[4] 李志. 上海市餐厨垃圾管理现状及对策研究[J].上海:上海交通大学, 2009, 28(1): 43-46.
[5] Choi J M, Han S K, Lee C Y. Enhancement of methane production in anaerobic digestion of sewage sludge by thermal hydrolysis pretreatment [J]. Bioresource Technology, 2018, 259:207-213.
[6] Li Y, Jin Y, Li H, et al. Kinetic studies on organic degradation and its impacts on improving methane production during anaerobic digestion of food waste [J]. Applied Energy, 2018, 213:136-147.
[7] Dai X H, Duan N N, Dong B, et al. High-solids anaerobic co-digestion of sewage sludge and food waste in comparison with mono digestions: stability and performance [J]. Waste Management, 2013, 33(2):308-316.
[8] 李晓帅, 张栋, 戴翎翎,等. 污泥与餐厨垃圾联合厌氧消化产甲烷研究进展[J]. 环境工程, 2015, 33(9):100-104.
[9] Prajapati K B, Singh R. Sewage sludge and food waste co-digestion to methane: a multi response and kinetic modeling study to evaluate the dynamics in compositional parameters [J]. Bioresource Technology Reports, 2018(2): 121-130.
[10] 黄月,赵明星,杨莉丽, 等. 餐厨垃圾与剩余污泥混合消化产甲烷性能及动力学分析研究[J]. 食品与生物技术学报,2017,36(5): 486-493.
[11] 王国华,王磊,谭学军, 等. 餐厨垃圾与污泥两相中温厌氧消化试验研究[J]. 净水技术,2014,33(1):54-57,71.
[12] 赵云飞,刘晓玲,李十中,等. 餐厨垃圾与污泥比例对联合发酵产沼气的影响[C]. 全国农村清洁能源与低碳技术学术研讨会论文集,2011:16-22.
[13] Xu R, Yang Z H, Zheng Y, et al. Depth-resolved microbial community analyses in the anaerobic co-digester of dewatered sewage sludge with food waste [J]. Bioresource Technology, 2017, 244:824-835.
[14] 苟成柳. 城市剩余活性污泥与餐厨垃圾混合厌氧消化特性研究[D].长沙: 湖南大学, 2014.