零价铁强化水解酸化对厨余与餐厨垃圾混合厌氧消化性能的影响  

Effect of zero-valent iron enhanced hydrolytic acidification on the anaerobic digestion of kitchen waste and food waste

作　　者：李子庆 陈锡腾 袁海荣 李秀金 LI ZiQing;CHEN XiTeng;YUAN HaiRong;LI XiuJin(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2023年第3期41-48,共8页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家重点研发计划(2018YFC1900903)。

摘　　要：基于厨余垃圾成分复杂而难以水解酸化的特点,提出通过投加零价铁强化厨余与餐厨垃圾水解酸化进而提高厌氧消化性能的策略。将厨余垃圾和餐厨垃圾按照不同配比混合,设置零价铁投加量为5、10、15和20 g/L,考察不同投加量条件下厌氧体系的消化性能。结果表明:酸化阶段厨余垃圾质量分数50%的试验组水解酸化效率最高,产生的乙醇和总挥发性脂肪酸(TVFA)总量比单独厨余垃圾试验组提高了206.78%;适量投加零价铁可以提高乙醇和TVFA的总产量,且投加量与油脂降解率、溶解性化学需氧量(SCOD)、乙醇和TVFA产量呈正相关;当投加量超过10 g/L后,零价铁对水解酸化的促进效果不明显。利用酸化出料进行甲烷化试验,投加零价铁组的累积产甲烷量有所增加,且产气速率提高,其中厨余垃圾占比100%、零价铁投加量10 g/L试验组的累积产甲烷量为(2664±130)mL,比对照组提高了15.61%。综合以上结果,在酸化相投加零价铁能够提高混合垃圾产气效率。The effect of adding zero-valent iron on the hydrolytic acidification of kitchen waste(KW)and food waste(FW)during anaerobic digestion(AD)has been investigated.KW and FW were used as AD substrates in different proportions.The dosages of zero-valent iron were set at 5,10,15 or 20 g/L in order to investigate the digestibility of anaerobic systems with different dosages.The results showed that the highest hydrolysis acidification efficiency was obtained with 50%KW group,and the ethanol and TVFA concentrations increased by 207%compared with the single KW.Appropriate dosages of zero-valent iron can improve the total production of ethanol and TVFAs,and the dosage of zero-valent iron was positively correlated with the oil degradation rate,SCOD,production of ethanol and TVFA.However,when the dose exceeded 10 g/L,the improvement observed by adding further zero-valent iron was not significant in the case of hydrolysis and acidification.Methanation experiments at varying acidification contents showed that the cumulative methane yield(CMY)of added zero-valent iron increased and the AD speed rate accelerated.The CMY of KW with 10 g/L of zero-valent iron was(2664±130)mL,which is 15.61%higher than that of the control group.These results confirm that adding zero-valent iron during the acidification phase can improve the AD efficiency of KW and FW.

关 键 词：厨余垃圾 餐厨垃圾 零价铁 水解酸化 

分 类 号：X705[环境科学与工程—环境工程]