关键词: 餐厨垃圾, 低负荷运行, 设计总结, 稳定运行, 垃圾品质

Abstract: Food waste has the characteristics of high organic matter content, high waster content, and easy deterioration, which was easy to pollute the environment. The promotion of food waste treatment is conducive to the reduction, recycling and harmless of waste. In the study, the typical food waste treatment project in southeast coastal areas were mainly composed of food waste pretreatment system, anaerobic fermentation system, biogas purification system, sewage treatment system, boiler system and deodorization system. The operation effect of the project was influenced by the factors such as the quality of food waste collection, the characteristics of local diet (heavy matters was 1.4 times the average such as shell) and the volume of food waste collection and transportation (only have 1/4 design capacity on average). During the commissioning of the project, the pretreatment system was stuck seriously, the concentration of COD/ammonia nitrogen in biogas slurry of the anaerobic system was approximate to 2(<5), the sewage system needed to add a large number of carbon sources to maintain stable operation, and the sulfur load was less than 1/3 of the design led to the biological desulfurization system was not suitable for sludge inoculation. Through strictly controlling the quality of collection in the operation, adding additional equipment to the pretreatment system (gravel conveying line), adjusting the operation mode of biogas purification system(adjusted to alkali desulfurization) and using the three-phase separation liquid of the pretreatment system as the carbon source to allocate the sewage water inflow at the ratio of 1∶5~1∶10, etc, the stable and up-to-standard operation of the project could be ensured, the average gas production and methane concentration of the anaerobic system were 62 m3/t (into the anaerobic tank material) and 60%. The design and operation experience of the project could provide reference for other similar projects, and contribute to promoting the stable operation of similar projects at low cost and up to standards.

Key words: food waste, low load operation, design review, stable operation, waste quality