ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In order to explore the biogas production characteristics of lignocellulosic feedstock, some typical materials including maize straw, rice straw, cotton straw, rape straw, herbal residue, bagasse and papermaking residue were chosen as substrates to analyze the effect of retting time, initial pH value and inoculation rate on their biogas productions. And the biogas production potential difference between mesophilic (（35±2）℃) and thermophilic fermentation (（53±2）℃) was compared as well. The results indicated that cotton straw and bagasse could not be started successfully to produce biogas without retting, but could obtain the highest biogas production after 7 d retting operation. And rape straw could be fermented successfully and even gain the highest biogas production without any retting. Among all the raw materials, rice straw could gain the largest biogas production under the mesophilic fermentation condition (352.56 mL/g). And its biogas yield could only be increased by 20.92% when the fermentation status was changed from mesophilic to thermophilic condition, which meant that mesophilic fermentation might be suitable for rice straw. Under the thermophilic fermentation condition, the silage maize straw could gain the highest biogas yield (480.00 mL/g), which was 82.49% higher than the mesophilic fermentation. So the thermophilic fermentation might be perfect for silage maize straw. In addition, the biogas production could also be increased gigantically for herbal and papermaking residues when the thermophilic fermentation condition was adopted.