Evaluating the operation efficiency of kitchen waste anaerobic digestion with carbon and nitrogen balance model
SHI Zhen-chao1, GE En-yan2, HE Pin-jing1,3, PENG Wei1, ZHANG Hua1, Lü Fan1,4
1. Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China; 2. Zhejiang Research Center of Urbanization Development, Hangzhou 310007, China; 3. Shanghai Engineering Research Center of Multi-source Solid Waste Co-processing and Energy Utilization, Shanghai 200092, China; 4. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
Abstract：A typical AD plant for kitchen waste was taken as a case to evaluate carbon and nitrogen flow using the carbon and nitrogen balance model, and the operation performance was evaluated through the distribution of carbon and nitrogen in solid, liquid and gas phases. The results showed that the carbon and nitrogen material flow can fit well with the results of biogas production (goodness of fit was 0.88). The modified solid-liquid separation unit in the model significantly improves the simulation results of solid content (TS) of solid digestate and liquid digestate (goodness of fit increased to 0.97 and 0.82, respectively). Clearly, the carbon and nitrogen balance model-assisted approach, integrated with the actual gas production index (RBMP), is suitable for evaluating the operating efficiency.
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