CaO_(2)预处理耦合ZVI强化含油餐厨垃圾厌氧消化

Enhanced Anaerobic Digestion of Greasy Food Waste with Calcium Peroxide Pretreatment Coupled with Zero‑valent Iron

餐厨垃圾中油脂降解困难,易导致厌氧消化失败。为促进含油餐厨垃圾的厌氧消化过程,采用过氧化钙(CaO_(2))预处理和添加零价铁(ZVI)耦合策略,并优化投加量。结果表明,CaO_(2)预处理最优投加量为0.05 g/gVS,最佳预处理时间为24 h。预处理后油脂降解率提高了300.06%,溶解性蛋白质和多糖的浓度分别提高了2.87和1.95倍。添加3 g/L的ZVI使累积产气量达368.92 mL/gVS,较空白组提高了95.92%,辅酶F420和电子传递体系(ETS)活性分别提高了46.93%和105.13%。CaO_(2)预处理促进了有机质的降解,ZVI提高了系统稳定性和相关酶活性。CaO_(2)预处理和添加ZVI耦合策略可有效提高含油餐厨垃圾的厌氧消化产气性能。

It is difficult to degrade grease in food waste,which easily leads to the failure of anaerobic digestion.This paper adopted calcium peroxide(CaO_(2))pretreatment coupled with zero‑valent iron(ZVI)to promote the anaerobic digestion process of greasy food waste,and the chemical consumption was optimized to achieve a better digestion performance.The optimal dosage of CaO_(2)pretreatment was 0.05 g/gVS,and the optimal pretreatment time was 24 hours.After pretreatment,the degradation rate of grease was increased by 300.06%,and the concentrations of soluble protein and soluble polysaccharide were increased by 2.87 times and 1.95 times,respectively.The addition of ZVI with concentration of 3 g/L increased the cumulative gas production to 368.92 mL/gVS,which increased by 95.92%compared with that of the blank group,and the activities of coenzyme F420 and electron transport system(ETS)increased by 46.93%and 105.13%,respectively.CaO_(2)pretreatment promoted the degradation of organic matter,and ZVI improved the system stability and related enzyme activities,indicating that the CaO_(2)pretreatment coupled with ZVI effectively improved the gas production performance of greasy food waste in anaerobic digestion.