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

Methane Generation Performance and Kinetic Analysis of Food Waste and Excess Sludge Treatruant by Anaerobic Co-Digestion Technology

DOI：10.3969/j.issn.1673-1689.2017.05.007

中文关键词: 餐厨垃圾 厌氧消化 剩余污泥 甲烷 动力学模型

英文关键词: food waste,anaerobic digestion,excess sludge,methane,kinetic model

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中文摘要:

将餐厨垃圾与剩余污泥作为底物，设置VS质量比分别为1∶0，0∶1和1∶1 3组对照组，通过产甲烷性能和动力学的分析来研究单独厌氧消化与混合消化。结果表明在整个运行期间，除了可以提高产甲烷的效率，混合消化组还能缩短餐厨垃圾单独厌氧消化的产甲烷时间，其甲烷产量为233.394 mL/gVS，比餐厨垃圾与剩余污泥单独厌氧消化计算值198.939 mL/gVS提高17.4%，利用一级动力学模拟3组产甲烷量，相关性系数R2均大于0.989。餐厨垃圾组、剩余污泥组和混合消化组的G∞分别为276.5、113.955 mL/gVS和248.81 mL/gVS，与实际测量值285.24、112.238 mL/gVS和233.94 mL/gVS相近。同时对反应过程中的pH、VFAs、SCOD以及脱氢酶进行了对比分析，相比于餐厨垃圾的单独厌氧消化，添加一定的剩余污泥可以平衡营养物质，降低反应体系的酸化，使混合后的底物具有较大的缓冲能力，提高系统稳定性；而对剩余污泥单独厌氧消化而言，添加一定的餐厨垃圾可以增加有机物含量，提高了产甲烷处理效果。混合消化组的脱氢酶酶活在整个反应过程都大于餐厨垃圾单独消化，最大值为657.2 TFμg/（mL·h）。

英文摘要:

The study compared the performance and kinetics for the generation of methane by different ratios of food waste to excess sludge at 1∶0，0∶1，1∶1. Results showed that the co-digestion not only shortened the time of methane generation when compared to food waste alone treatment，but also improved the production efficiency with a yield of 233.394 mL/gVS，which was 17.4% higher than the calculated value of 198.939 mL/gVS according to food waste and excess sludge alone groups. The correlation coefficient R2 was greater than 0.989 by the first order kinetics fitting. The G∞ of food waste，excess sludge and co-digestion groups was 276.5，113.955 mL/gVS and 248.81 mL/gVS，respectively. They were similar to the actual measured values of 285.24，112.238 mL/gVS and 233.94 mL/gVS，respectively. Also，the comparative study of pH，VFAs，ammonia-nitrogen，SCOD and dehydrogenase enzyme was carried out and showed that the co-digestion balanced nutrients and decreased the system acidification，which resulted in a better buffer capacity and the system stability for the mixed substrates. It increased the amount of easily degradable organic matters and improved the methane producing efficiency as compared to the excess sludge only group. The dehydrogenase activity of co-digestion group was higher than that of kitchen waste only digestion group during the whole digestion process，with a maximal value of 657.2 TFμg/（mL·h）.

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