|Effects of Temperature on Flocculation/Adsorption Sludge Hydrolysis and Acidification by Alkaline Pretreatment
|中文关键词: 水解酸化 生物絮凝吸附污泥 发酵 碳源
|英文关键词: hydrolysis and acidification bio-flocculation/adsorption sludge fermentation carbon source
| The effect of temperature on the bio-flocculation and adsorption sludge hydrolysis and acidification was investigated through applying four configuration-consistent and completely mixed pattern of hydrolysis acidification reactors. The four reactors were fed with bio-flocculation and adsorption sludge with the same contents. The experiments were performed under the conditions of 15℃, 25℃, 35℃, 45℃ respectively and initial pH is 10. The results show that the hydrolysis and acidification of bio-flocculation/adsorption sludge speeds up when temperature rises. Under the condition of 45℃,after 5 days SCOD achieves its maximum of 3976.3mg/L, and 1988.5mg/L VFAs are produced and peaked. With the temperature rising, among the maximum concentration of VFAs components the proportions of acetic acid and propionic acid also grow, reaching 51.25% and 26.32% respectively. Besides, under the four conditions of different temperatures, the carbon source production through the hydrolysis and acidification of bio-flocculation and adsorption sludge are accompanied with the release of nitrogen and phosphorus. The higher the temperature is, the more obvious the release is. In general, 35℃ is the perfect condition under which the hydrolysis and acidification of bio-flocculation and adsorption sludge can not only provide nitrogen removal system with more carbon source, but also can avoid excessive release of nitrogen and phosphorus.