稀土化合物对泥炭产甲烷的促进作用

Enhanced Methane Production from Peat with Rare Earth Compounds

为改善泥炭生物转化甲烷产率低的现状,提高甲烷产量,探索稀土化合物对泥炭生物甲烷转化过程的影响;以草本泥炭为原料,通过添加不同浓度的稀土化合物CeCl_(3)和YbCl_(3)的方法,解析稀土化合物对日产气量、总产气量、碱度、辅酶F_(420)浓度、COD和葡萄糖浓度的影响。研究结果表明:在50℃发酵温度下,厌氧发酵24 d,添加200 mg·L^(-1) CeCl_(3)泥炭发酵组总产气量为246.33 mL,比空白组提高了21.31%,碱度增加了122.22%,在第1~9 d辅酶F_(420)浓度维持在1.53×10^(-3)~2.59×10^(-3) mmol·L^(-1),COD去除率达46.18%,葡萄糖浓度比空白组高7.42%;添加200 mg·L^(-1) YbCl_(3)泥炭发酵组的总产气量为235.67 mL,比空白组提高了16.06%,碱度增加了126.15%,辅酶F_(420)在第1~12 d维持在1.89×10^(-3)~2.83×10^(-3) mmol·L^(-1),COD去除率达44.31%,葡萄糖浓度比空白组高6.75%,效果优于对照组,揭示了泥炭生物甲烷发酵体系中,添加CeCl_(3)和YbCl_(3)有助于提高泥炭甲烷发酵体系中产甲烷微生物的活性,增加甲烷产量,促进泥炭生物甲烷转化进程。

In order to solve the issue of low methane production of peat biomethane conversion and increase methane yield,the effect of rare earth compounds on microbial activity in this process was explored.Rare earth compounds with different concentrations of CeCl_(3) and YbCl_(3) were added to the peat biomethanation reaction system with meadow peat as raw materials,and the changes in daily methane production,total methane production,alkalinity,coenzyme F_(420) concentration,COD and glucose concentration during the fermentation were analyzed.The research results showed that at 50℃fermentation temperature,peat biomethane fermentation for 24 d,with 200 mg·L^(-1) CeCl_(3) added,total methane production is 246.33 mL,which increases 21.31%compared with the control group,in addition,the alkalinity increases by 122.22%,coenzyme F_(420) concentration maintains at 1.53×10^(-3)~2.59×10^(-3) mmol·L^(-1) on the 1 st~9 th day,COD removal rate is 46.18%,and the glucose concentration is 7.42%higher than that of the control group;after adding 200 mg·L^(-1) YbCl_(3),total methane production is 235.67 mL,an increase of 16.06%comparing with the control group,besides,the alkalinity increases 126.15%,coenzyme F_(420) concentration is kept at 1.89×10^(-3)~2.83×10^(-3) mmol·L^(-1) on the 1 st~12 th day,COD removal rate is 44.31%,and the glucose concentration is 6.75%higher than that of the control group,which are significantly higher than the blank control group without rare earth compounds.It proves that the adding of rare earth compounds CeCl_(3) and YbCl_(3) is helpful to improve the activity of methanogens in peat methane fermentation system,increase the methane production,and promote the conversion process of peat biomethane.