Abstract:Waste activated sludge anaerobic fermentation can produce short chain fatty acids (SCFAs), which can improve nitrogen and phosphate removal efficiency after being used as carbon source. However, the nitrogen and phosphorus in the fermentation liquor can place extra burden on waste water treatment plant. This study used Mg (OH)2 to control the pH of fermentation, by contrast NaOH was also used. Then we tested if the Mg (OH)2 could realize waste activated sludge fermentation and remove the NH4+-N and PO43--P from fermentation liquor at the same time, moreover, the dewaterability of fermented sludge was also investigated. The results showed that Mg (OH)2 could promote waste activated sludge fermentation with 2336.3mgCOD/L SCFAs in fermentation liquor. Also Mg (OH)2 could remove the PO43--P from fermentation liquor ,which reached to nearly zero on fourth day. At last, the dewaterability of waste activated sludge after being fermented in Mg (OH)2 group was better than that in NaOH group. The former waste activated sludge capillary suction time (CST) was shorter of 42.3s than the latter.
袁悦, 彭永臻, 金宝丹, 王博, 王淑莹. 氢氧化镁对剩余污泥碱性发酵及脱水性能的影响[J]. 中国环境科学, 2014, 34(7): 1790-1796.
YUAN Yue, PENG Yong-Zhen, JIN Bao-Dan, WANG Bo, WANG Shu-Ying. Fermentation and dewaterability of waste activated sludge under alkaline conditions: Effect of Mg(OH)2. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1790-1796.