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

The treatment of anaerobic digestion effluent has become the bottleneck of large-scale biogas station application in China. In order to promote the engineering application of ammonia nitrogen stripping and recovery of anaerobic digestion, an integrated equipment for ammonia stripping and recovery with relative low cost was designed and constructed on-site to demonstrate its efficiency in real biogas plants, decrease lime dosage and control foam. This device mainly consisted of three functional units: pretreatment unit, pH value adjustment unit and ammonia stripping and recovery unit. To reduce the energy consumption, economical reflux circulated stripping method was adopted. A pilot test was carried out by using swine manure anaerobic-digested effluent at a biogas station of Beijing suburbs, the results showed that pH value of anaerobic digestion can be reached 10.5 by adding 22g lime per liter after four months experiment and optimization, and ammonia removal rate reached 55.8% when the temperature and gas-liquid ratio were 30.7℃ and 960, respectively. Although adding dry lime powder was easily operated, the dissolved efficiency was relatively low. Pre-dissolved lime slurry can effectively avoid the defects and reduce the dosage by 7.5g/L. Moreover, the effective calcium oxide content of lime from different producers had significant differences. And the performance of lime from different producers in increasing anaerobic digestion effluent pH value was compared and the lime dosage was also analyzed at different temperatures. Finally, higher ammonia removal rate could be attained by using this integrated device under ambient temperature and low air-liquid ratio (0～1000).