Effects of intermittent power-on and electrode inversion on anaerobic co-digestion of sludge and food waste in MEC-CSTR system
ZHI Zhongxiang,
HAN Yule,
LU Xueqin,
SUN Yuwei,
ZHEN Guangyin*
Affiliations
ZHI Zhongxiang
Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, College of Ecology and Environmental Science, East China Normal University
HAN Yule
Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, College of Ecology and Environmental Science, East China Normal University
LU Xueqin
1. Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, College of Ecology and Environmental Science, East China Normal University; 2. Chongming Ecological Research Institute
SUN Yuwei
Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, College of Ecology and Environmental Science, East China Normal University
ZHEN Guangyin*
1. Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, College of Ecology and Environmental Science, East China Normal University; 2. Shanghai Organic Solid Waste Bioconversion Engineering Technology Research Center; 3. Shanghai Institute of Pollution Control and Ecological Safety; 4. Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area, Ministry of Natural Resource
The rapid urbanization has led to the discharge and generation of large amounts of organic solid waste, such as sewage sludge (SS) and food waste (FW). The introduction of a microbial electrolysis cell (MEC) into the anaerobic digestion (AD) process can realize efficient methane conversion. In this study, the effects of intermittent power-on and electrode inversion on the MEC-Continuous stirred tank reactor (CSTR) were investigated. The results showed that the MEC-CSTR operated well under an applied voltage of 1.2 V and sludge retention time (SRT) of 15 d, with a methane yield of (741.9±99.2) mL/L- reactor/d. A short power outage period (2 d) did not adversely affect the performance of the system, whereas power outage of 7 d decreased the organic hydrolysis effect and methane yield of the reactor. Furthermore, successive electrode switching induced a decrease in the methane yield ((541.7 ± 32.0) mL/L-reactor/d). However, neither the power outage nor the electrode inversion caused a significant effect on the physical and chemical properties of the digestate or the hydrolysis of organic matter. This study can provide a new solution for MEC system to enhance the optimal implementation of SS and FW scale disposal and anaerobic energization project.
