Research On The Enhancement Of Anaerobic Digestion Of Cellulosic Wastes By Co-fermentation

Lignocellulose waste resources is abundant in our country, but there are someproblems such as low utilization rate and simple utilization way. Effective utilization oflignocellulose resources is one of the effective ways to reduce the pressure of energyshortage problems of the rural and urban residents. The digestion capacity of anaerobicmicrobe on the degradation of lignocellulose substance is poor, resulting in low digestionefficiency and limiting the industrial application.In the current research the enhance process of cellulosic wastes using corn stover andPotamogeton crispus as substrates were explored. The co-feremantion process of cornsover and cyanobacterial biomass, corn stover and algal residues, Potamogeton crispusand solid NaOH were chacteristirzed. The main contents and results were listed asfollows:(1) Mixed fermentation process of corn stover and cyanobacterial biomass harvestedfrom Lake Chaohu. Compared to the single substrate system, the final gas production andformation rate were significantly improved. When corn stover and algae and sludge ofvolatile solids (VS) mass fraction ratio is2:8:1, the biogas production effeciency is thebest. The bigoas yield was687.3mL/g VS, methane volume fraction is63.3%, celluloseand hemicellulose degradation efficiency were48.5and62.8%respectively.(2) Mixed fermentation process of corn stovers and algal residue: compared to Cornstover or algal residue as a single substrate system, efficiency of co-fermentation systemwas improved significantly. When corn stover and algae and sludge of Volatile solidsmass fraction ratio is10:2:2, he biogas production effeciency is the best. The biogas yieldcan be up to421.0mL/g, methane volume fraction is49.6%, cellulose and hemicellulosedegradation efficiency were83.7and68.4%respectively.(3) Mixed fermentation process of Potamogeton crispus and alkali: compared withthe conventional anaerobic fermentation process, adding a certain amount of NaOH cansignificantly increase methane production of Potamogeton crispus. When Potamogetoncrispus and inoculum VS mass fraction ratio is4:1and NaOH dosage was3.5%amount ofthe total VS, the gas and methane production of Potamogeton crispus is the best. Thegas-producing yields of the two reactors inoculated with anaerobic sludge and cow dungwere284.4and390.0mL/g VS. The methane-producing yeils was125.9and186.5mL/gVS added. The cellulose digestion efficiency was greatly improved and the fermentationefficiency of hemicellulose was much higher than cellulose. Compare to anaerobic sludge,the fermentation efficiency of cellulose are relatively higher using cow dung as inoculum.