城市污泥好氧堆肥过程中有机质降解模型

发布时间：2019-01-28 23:24

【摘要】：以城市污泥、锯末为原料,在250 L温度-氧气反馈通风的自动控制发酵仓内,分别设置2组堆肥,堆体1、堆体2均采用连续式通风控制工艺。通过分析总糖、脂肪、蛋白质、半纤维素、纤维素、木质素等有机质组分在不同阶段的含量变化,拟合得到各组分的一级反应速率常数。结果表明,总糖、脂肪、蛋白质等易生物降解部分在堆肥运行0~6 d降解效果明显,平均降解率可达58.5%,后期降解效果较为缓慢。中等程度降解有机质如半纤维素、纤维素在持续高温期降解率高。难生物降解部分主要集中在堆肥后期进行降解,总降解小于10%。各有机质组分的降解速率满足一阶降解动力学模型(r290%)。其中,易降解有机质组分降解速率常数、中等程度降解部分降解速率常数、难降解部分降解速率常数分别为0.081 5~0.096 9 d-1、0.038 4~0.053 6 d-1、0.008 6~0.008 9 d-1,易降解组分的速率常数约为中等程度降解部分的2倍,难降解部分的10倍。各组分的平均降解速率大小关系为:总糖蛋白质脂肪半纤维素纤维素木质素。
[Abstract]:Using municipal sludge and sawdust as raw materials, two groups of compost were set up in 250L temperature-oxygen feedback ventilation fermenting bin. The first order reaction rate constant of each component was obtained by analyzing the content changes of organic components such as total sugar, fat, protein, hemicellulose and lignin at different stages. The results showed that the biodegradable parts such as total sugar, fat and protein had obvious degradation effect after 0 ~ 6 days of composting, the average degradation rate was 58.5, and the degradation effect was slow in the later stage. The degradation rate of organic matter such as hemicellulose is high in the period of continuous high temperature. The difficult biodegradable part was mainly concentrated in the later stage of compost and the total degradation was less than 10%. The degradation rate of each organic matter component meets the first order degradation kinetic model (r 290%). Among them, the degradation rate constant of easily degradable organic matter component, the partial degradation rate constant of medium degree degradation, the degradation rate constant of difficult degradation part are 0.081 ~ 0.096 9 d ~ (-1) ~ 0.038 4 ~ 0.038 4 ~ 0.053 ~ (6) d ~ (-1) ~ 0.008 ~ (6) ~ 0.008 ~ (9) d ~ (-1), respectively. The rate constant of the easily degradable components is about 2 times of that of the moderately degraded part and 10 times of that of the refractory part. The average degradation rate of each component is as follows: total sugar protein adipose hemicellulose lignin.
【作者单位】：桂林理工大学环境科学与工程学院;广西环境污染控制理论与技术重点实验室;广西岩溶地区水污染控制与用水安全保障协同创新中心;
【基金】：国家自然科学基金(编号:41161075) 广西“八桂学者”建设工程专项广西壮族自治区自然科学基金重大项目(编号:2013GXNSFEA053002);广西壮族自治区自然科学基金(编号:2014GXNSFBA118210)
【分类号】：S141.4

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