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 mixed culture of photosynthetic bacterial was screened from activated sludge to carry out the experiment of hydrogen production. The effect of different nitrogen sources on the growth and hydrogen production of photosynthetic bacteria was studied, and the utilization pattern of nitrogen source in the process of hydrogen production by photosynthetic bacterial was also analysed. The results showed that: the photosynthetic bacteria had a significant selectivity in the process of growth to utilize nitrogen source. Inorganic nitrogen sources, especially ammonium salts was the most vulnerable to be used by photosynthetic bacteria, and organic nitrogen sources followed. Using (NH4)2SO4 as nitrogen source for growth, the best added concentration was obtined, which was 7 mmol/L. The maximum utilization appeared in 24~48 h of cultivated time, and the top consumption rate was 0.105 mmol/L. The impact of different nitrogen type on photosynthetic hydrogen production was not significant and the organic nitrogen was slighely better than inorganic nitrogen. When photosynthetic bacteria utilized (NH4)2SO4 as nitrogen source for hydrogen production and the added concentration was set as 3.5 mmol/L, the photosynthetic bacteria showed better activity of hydrogen production. The nitrogen source was only consumed during 0~48 h in the process of hydrogen production, and the cell no longer utilized the nitrogen source once the cell went into the period of hydrogen-producing peak.