餐厨垃圾两相厌氧消化特性试验研究

研究了餐厨垃圾两相厌氧消化特性。以北京化工大学餐厨垃圾为原料,分别以不同有机负荷(10、30、50和70 gVS/L)、接种量(5、10、15和20 gVS/L)、酸化时间(3、5、7和9 d)考察其对酸化效果的影响,并对酸化出料进行甲烷化产气实验。结果表明,餐厨垃圾最优酸化条件为有机负荷30 gVS/L,酸化时间5 d,接种量15 gVS/L。在此条件下,单位负荷产酸率为561.0 mg乙酸/gVS,酸化末端产物主要为乙酸和丁酸,单位负荷累积产气量达到826.7 mL/gVS,比乙醇型最佳条件单位负荷累积产气量763.8 mL/gVS高8.2%,比丁酸型最低单位负荷累积产气量70.6 mL/gVS高1 070.3%。有机负荷、酸化时间、接种量依次对餐厨垃圾酸化有重要的影响,并且餐厨垃圾酸化效果和产气性能具有一致性。研究结果可为城市生活垃圾厌氧消化提供设计和运行依据。

Pilot Scale Study on Two-phase Anaerobic Digestion Performance of Kitchen Waste

Two-phase anaerobic digestion performance of kitchen waste was investigated with different organic loading rate(OLR) of 10,30,50 and 70 gVS/L,inoculums dosages of 5,10,15 and 20 gVS/L,acidification times of 3,5,7 and 9 d by orthogonal experiment design.Kitchen waste from campus restaurant was used as feedstock.Results showed that kitchen waste obtained the best acidification results with 30 gVS/L of OLR,15 gVS/L of inoculums dosage and 5 day of acidification time.The acid yield of kitchen waste was 561.0 mg acetic acid.gVS/L mainly acetate and butyrate.Total biogas yield was 826.7 mL/gVS,which was 8.2% and 1,070.3% higher than ethanol type fermentation of 763.8 mL/gVS in the best condition,and butyrate type fermentation of 70.6 mL/gVS in the worst condition respectively.Therefore OLR,acidification time and inoculums dosage have important influence on acidification and methane of kitchen waste.The study would provide parameters for effective operation and optimal design of anaerobic digestion facility of municipal organic solid waste.