CARBON NEUTRAL POTENTIAL OF WHOLE PROCESS OF CO-DIGESTION OF FOOD WASTE AND SLUDGE
In the context of China's active promotion of carbon neutrality,co-digestion of food waste(FW)and sludge is a potential low-carbon treatment model.However,few studies have been conducted on the potential effect of co-digestion on wastewater treatment plants.In addition,the nitrogen content in the co-digested supernatant is high,and the low-carbon process of partial nitrification and anammox(PN/A)allows for low energy consumption and autotrophic nitrogen removal.Therefore,the co-digestion process of food waste and sludge was introduced in this study,and the supernatant was subjected to sidestream PN/A treatment,focusing on the carbon neutral potential and sustainability of food waste and sludge co-digestion.The findings indicated that the methane production of co-digestion was 109.5％higher than that of food waste digestion alone,the system could enhance the overall energy recovery by 1.3 times and achieve a carbon neutral state rate of 132.2％.Additionally,sensitivity analysis highlighted that low-energy operation and efficient energy resource recovery are crucial directions for combining food waste and wastewater treatment to accomplish carbon neutrality.The objective of this study is to provide a reference for the establishment of carbon-neutral collaborative treatment models,and provide both theoretical groundwork and practical assistance for the sustainable treatment of food waste and sludge.
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