电化学预处理对餐厨垃圾-污泥耦合厌氧发酵产挥发性脂肪酸的影响

利用餐厨垃圾-污泥耦合厌氧发酵产挥发性脂肪酸（volatile fatty acids，VFAs）具有广泛的经济和应用价值。本实验考察了在1 V电化学预处理条件下，研究餐厨垃圾占比（空白对照，0%，5%，10%，质量分数）对厌氧发酵生成VFAs产量的影响，从而得出产VFAs的最优条件。研究表明:经过60 min 1 V电化学预处理后，随着餐厨垃圾占比从0%增加到10%，水体中溶解性COD浓度随时间变化迅速增加，最高可达到969~1266 mg/L，随着厌氧发酵的进行转化成VFAs。其中，当餐厨垃圾占比为10%时，VFAs在15 d内最高浓度可达到132.2 mg/L。实验结果表明，电化学预处理可改善餐厨垃圾-污泥特性，加快厌氧发酵过程，同时餐厨垃圾可增加污泥中有机质含量，增加VFAs产量，实现餐厨垃圾-污泥产VFAs的资源化利用途径。

EFFECT OF ELECTROCHEMICAL PRETREATMENT ON PRODUCTION OF VOLATILE FATTY ACIDS BY CO-ANAEROBIC FERMENTION OF FOOD WASTE AND SEWAGE SLUDGE

Volatile fatty acids (VFAs), produced by co-anaerobic fermentation food waste and sewage sludge, have widely economic and practical value. This study investigated the effects of different food waste ratios of food waste-sewage sludge (control, 0%, 5% and 10%) for co-anaerobic fermentation of food waste and sewage sludge on the production of VFAs with 1 Volt electrochemical pretreatment. The results showed that under the electrochemical pretreatment, the concentration of soluble COD increased rapidly up to 969~1266 mg/L with the food waste ratios increased from 0% to 10%, and then it was converted to VFAs. Especially, the highest VFAs production achieved at 132.2 mg/L within 15 days when the food waste ratio accounting for 10% of food waste-sewage sludge. This study proved that 1 Volt electrochemical pretreatment could improve the characteristics of food waste-sewage sludge and accelerate their co-anaerobic fermentation. At the same time, food waste addition could increase the content of organic matters in sewage sludge, which further increased the VFAs production to realize the resource utilization.