镍及其螯合物对餐厨垃圾厌氧发酵影响的试验研究

采用氨三乙酸(NTA)强化Ni 2+对餐厨垃圾的厌氧发酵效果,分析了有机底物水解、酸化、产甲烷等过程。在当NTA/Ni(摩尔比)为1的条件下,取得如下试验结果:累积生物气产量和甲烷含量分别达到765 mL和66.3%,为只投加Ni 2+条件下的1.64和1.21倍;厌氧体系产生的挥发性脂肪酸浓度达到最大值3800 mg/L,反应进行至20 d后的挥发酸(VFAs)浓度于降低至579.2 mg/L,VFAs累积量低于其他反应容器;蛋白水解效果得到优化,溶解性蛋白浓度于第5 d达到最大值1829.82 mg/L;NTA与Ni 2+的协同作用更有利于含氮有机物的水解,氨氮浓度可提高至400~650 mg/L。

Study on the effects of Ni and its chelate on anaerobic fermentation of kitchen wastes

Ammonia triacetic acid(NTA)was used to enhance the anaerobic fermentation effect of Ni 2+on kitchen waste.The processes of hydrolysis,acidification and methanogenesis of organic substrate were analyzed.When the NTA/Ni ratio is 1,the results show that the cumulative biogas production and methane content reach 765 mL and 66.3%,respectively,which are 1.64 and 1.21 times of those when only Ni 2+was added.The concentration of volatile fatty acids(VFAs)produced by the anaerobic system reaches a maximum value of 3800 mg/L,and decreases to 579.2 mg/L after 20 days.The cumulative amount of VFAs is lower than other reaction vessels.The proteolytic effect is optimized.The soluble protein concentration reaches a maximum value of 1829.82 mg/L at the 5th day.The synergistic effect of NTA and Ni 2+is conducive to the hydrolysis of nitrogen-containing organic compounds,and the ammonia nitrogen concentration is increased to 400~650 mg/L.