餐厨垃圾浆液厌氧产酸工艺研究

Study on Anaerobic Acid-Production Process of Kitchen Waste Slurry

摘要: 针对餐厨垃圾资源化利用过程，以分选除杂、破碎制浆提油后的餐厨垃圾浆液为研究对象，开展厌氧水解产酸工艺实验，分别考察初始pH、反应温度、污泥接种比例、发酵时间对餐厨垃圾浆液挥发性脂肪酸(VFA)积累效果的影响。结果表明：碱性环境可有效抑制产甲烷菌活性，减少VFA消耗；初始pH = 9、反应温度35℃、污泥接种比例8:1条件下餐厨垃圾浆液产酸性能最优；在pH = 9、35℃、接种比8:1工况下，发酵第8天VFA达到峰值，之后因底物消耗与产甲烷菌复苏，VFA浓度开始下降。本研究可为餐厨垃圾定向产酸制备酸化液提供工艺参数参考。

Abstract: Aiming at the resource utilization of kitchen waste, kitchen waste slurry obtained after sorting and impurity removal, crushing, pulping and oil extraction was used as the research object. Anaerobic hydrolysis and acid-production experiments were carried out to investigate the effects of initial pH, reaction temperature, sludge inoculation ratio and fermentation time on the accumulation of volatile fatty acids (VFA) in kitchen waste slurry. The results show that alkaline conditions can effectively inhibit the activity of methanogens and reduce the consumption of VFA. The optimal acid-production performance of kitchen waste slurry is achieved under the conditions of initial pH of 9, reaction temperature of 35˚C and sludge inoculation ratio of 8:1. Under the operating conditions of pH = 9, 35˚C and inoculation ratio of 8:1, VFA reaches its peak value on the 8th day of fermentation, and then the VFA concentration decreases due to substrate depletion and the recovery of methanogens. This study can provide technical parameter references for preparing acidified liquid by directional acid production from kitchen waste.