关键词: 家庭厨余垃圾资源化, 提油, 厌氧消化, 沼液处理, 运营安全, 经济性分析

Abstract: Wet waste resource utilization treatment includes restaurant food waste and kitchen waste. The existing wet waste anaerobic resource treatment project has an oil extraction process for restaurant food waste, but not having an oil extraction process for kitchen waste. This article is based on a wet waste anaerobic resource utilization project in Shanghai, analyze the impact of setting up oil extraction processes for kitchen waste before and after on the safety of engineering operations. Including the operational safety of anaerobic biological systems (such as volatile fatty acids, alkalinity, and oil content in biogas slurry), and operation safety of anaerobic biological treatment system for biogas slurry (such as dissolved oxygen). Indicate that the oil content in kitchen waste is approximately 1.5-2.5%. It is necessary to add an oil extraction process, Otherwise, it will lead to an increase in VFA and a decrease in alkalinity in the anaerobic system, making the system unsafe. The high oil content in the biogas slurry seriously affects the oxygenation effect of the sewage treatment system, and MBR system nitrification tank DO below 0.5%, poor processing effect, even leading to the collapse of biological systems. Economic analysis can increase oil and fat income, within the price range of 4000-8000 yuan/ton, deducting operating costs for oil extraction，the revenue per ton of garbage reaches37.20-94.20 yuan. Methane yield increased by about 12%. 40% reduction in membrane fouling frequency of anaerobic treatment system for biogas slurry. Provide reference for the engineering design and operation of wet waste resource utilization projects for new or renovated projects in cities.

Key words: resource utilization of household kitchen waste, oil extraction, anaerobic digestion, biogas slurry treatment, operational safety, Economic analysis