餐厨垃圾市政污泥联合厌氧消化处理技术

餐厨垃圾有机质浓度高，在厌氧消化处理过程中容易致系统酸化而导致消化系统中止。采用餐厨垃圾与市政污泥联合厌氧消化技术解决餐厨垃圾消化条件难控制的问题。结果表明，系统稳定运行时，在进料总固体（TS）浓度为10%左右，水力停留时间(HRT)为20 d，碱度控制在6 000~8 000 mg/L时，餐厨垃圾与市政污泥联合厌氧消化能稳定运行，且有机负荷达到5.29 g/(L•d)，沼气产量达1.03 L/g〔以挥发性固体（VS）计〕，沼气中的甲烷浓度在59%以上。

Research on Anaerobic Co-digestion of Food Waste and Sewage Sludge

The organic matter content of food waste is high and can easily cause system acidification and suspension in the process of anaerobic digestion. The anaerobic co-digestion technology to jointly treat food waste and sewage sludge was studied, which could well solve the difficulty of controlling the food waste digestion conditions. The results showed that the anaerobic co-digestion of food waste and sewage sludge could run steadily when the total solid(TS) content of the feeding waste was about 10%, hydraulic retention time(HRT) being 20 d, and alkalinity controlled between 6 000-8 000 mg/L. And under these conditions, the organic loading rate reached 5.29 g/(L•d), the biogas production rate reached 1.03 L/g (calculated by volatile solid(VS)) and the methane content in biogas was more than 59%.