摘要：

针对厨余垃圾液化处理后的废水难以降解和资源化的难题，本研究构建了一种紧凑堆栈式微生物电解池（Microbial electrolysis cell，MEC），实现了废水中有机物的快速降解和资源化产氢。以乙酸盐为底物，通过比较不同阳极材料和不同操作条件（辅助电压、溶液扰动）对堆栈式MEC反应器性能的影响，优化了反应器构型和运行参数。结果显示，使用厚度为5 mm的碳毡作为阳极材料的反应器在36 h内的COD去除率为（92±1）%，产氢速率达到了（65±12） mL/（L·d），远高于使用碳布和厚度为2 mm的碳毡作为阳极材料的反应器的性能。增大辅助电压和增加溶液扰动可以进一步优化反应器的性能，5 mm碳毡反应器在外加（0.70±0.02） V电压并增加溶液扰动的条件下，在13 h内去除了（96±2）%的COD，产氢速率高达（1 225±72） mL/（L·d）。参数优化后的反应器用于处理厨余垃圾液化液，可在20 h内去除（75±1）%的COD，并以（161±6） mL/（L·d）的速率产生氢气，实现了厨余垃圾液化液有机物降解和同步资源化产氢。

关键词: 厨余垃圾, 微生物电解池, 制氢, 反应器堆栈

Abstract:

Aiming at the problem that the wastewater produced after the liquefied processing of kitchen waste is difficult to degrade and recycle，a compact stacked microbial electrolysis cell（MEC） was constructed to rapidly degrade organic compounds in wastewater and resourceful hydrogen production. Using acetate as the substrate，the reactor configuration and operation parameters were optimized by comparing the effects of different anode materials and different operating conditions（auxiliary voltage，solution disturbance） on the performance of stacked MEC reactor. The results revealed that the COD removal rate of the reactor using carbon felt with a thickness of 5 mm as the anode material was （92±1）% and hydrogen production rate reached（65±12） mL/（L·d） within 36 h，which was much higher than that of the reactor using carbon cloth and carbon felt with a thickness of 2 mm as the anode material. After increasing the solution disturbance，the 5 mm carbon felt reactor removed （96±2）% COD within 13 h and produce hydrogen at the rate of （1 225±72） mL/（L·d） under the bipolar voltage of （0.70±0.02） V. The parameter-optimized reactor was used to treat the liquefied kitchen waste，which could remove （75±1）% COD within 20 h and produce hydrogen at the rate of （161±6） mL/（L·d），realizing the organic compounds degradation and simultaneous hydrogen production from wastewater.

Key words: food waste, microbial electrolysis cell, hydrogen production, stackable reactor

中图分类号: 

• X703.1