蓝藻与厨余垃圾混合消化产甲烷研究

对太湖蓝藻采用资源化处置方式,通过与厨余垃圾混合发酵,达到优化发酵底物、获得最佳产气效率的目的。研究结果表明:随着蓝藻厨余垃圾混合物中厨余垃圾比例的提高（1:0.5～1:2.5）,甲烷产率提高,混合比例1:2.5时甲烷量达到最大,为123.94 mL/g（TS）,比1:0.5反应组提高了44.1%;混合物中厨余垃圾比例由1:2.5增至1:3.0,产气量反而下降;反应前24 h,体系中挥发性脂肪酸含量迅速增加,至第24 h酸量开始下降,第48 h再次上升,此后酸量减少并趋于稳定;反应过程中,各组分pH值均维持在正常范围内;反应结束后,混合比例为1:2.5组辅酶F₄₂₀最大,为1.98μmol/g（VS）,反应体系中藻毒素从发酵前的273～72.6μg/L降低到检测限5μg/L以下。

A Study on the Methane Generation by Co-digestion of Cyanobacteria and Kitchen Wastes

Co-digestion of cyanobacteria mixed with kitchen wastes was carried out so as to optimise the fermentation substrate and attain an optimal methane generating rate.The data indicated that the methane yield would rise as more kitchen wastes mixed whilst reaching a maximum methane yield of 123.94 mL/g total solid under a cyanobacteria-to-kitchen waste mixing ratio of 1:2.5,44.1%more methane generated compared to that of the test group with a mixing ratio of 1:0.5.When kitchen waste portion further increased from 1:2.5 to 1:3.0, the methane yield would decline instead.The content of volatile fatty acids increased greatly in the first 24 hours,but began to decrease afterwards until another rise occurred at the 48-th hour,and then declined again whilst tending to keep stable later.The pH values of all test groups could maintain within normal ranges during the fermentation process.The value of coenzyme F₄₂₀ would reach a maximum of 1.98μmol/g volatile solid for the 1:2.5 mixing ratio group after the reaction.Moreover,the algae toxin content in the reaction system would degrade from 27.3～72.6μg/L to below the detection limit of 5μg/L through the anaerobic fermentation.