Advanced treatment of digested sludge using an aerobic bacterium
HE Pin-jing1,2, WANG Yue1, HU Jie1, SHAO Li-ming2, LÜ Fan1
1. Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China; 2. Centre for the Technology Research and Training on Household Waste in Small Towns & Rural Area, Ministry of Housing Urban-Rural Development, Shanghai 200092, China
Abstract：In order to evaluate the feasibility of applying Bacillus licheniformis as an aerobic bacterium on advanced treatment of digested sludge, dissolved organic carbon, dissolved total nitrogen, ammonia nitrogen concentration in the liquid phase of digested sludge and the protein, ammonia nitrogen concentration and modeled CST value in the digested sludge flocs, were measured at different inoculation ratios (respectively 2.7×10-3, 2.7×10-2, 2.7×10-1, total solid ratio), while the effects of mechanical disintegration method and bacterial treatment method on secondary digestion and gas production of digested sludge were also compared. The results showed that the addition of Bacillus licheniformis required a higher inoculation ratio to significantly promote the dissolution of digested sludge into the phase and to improve the biodegradability of digested sludge. When the inoculation ratio of Bacillus licheniformis was 2.7×10-1, DOC, DN, ammonia nitrogen concentration in the liquid phase and ammonia nitrogen concentration in the digested sludge flocs reached the maximum accumulative values during the bacterial treatment, which was respectively 6.23, 2.83, 5.93 and 4.94 times of that of the control group. The maximum degradation rate of protein was also observed in the digested sludge flocs. At this inoculation ratio 2.7×10-1, the biochemical methane potential of the digested sludge was superior to that of other inoculation ratio and was 5.96 times of that of the digested sludge treated by mechanical disintegration. Therefore, this method of bacterial treatment was beneficial to further deepen the utilization of residual refractory organic matter in digested sludge and to improve its biodegradability and final stability after digestion. However, after the bacterial treatment, the modeled CST value of digested sludge was 2.69 times of that of the control group, which deteriorated the dewaterability of the digested sludge.
何品晶, 王玥, 胡洁, 邵立明, 吕凡. 应用好氧生物菌剂深度处理消化污泥[J]. 中国环境科学, 2018, 38(1): 222-233.
HE Pin-jing, WANG Yue, HU Jie, SHAO Li-ming, LÜ Fan. Advanced treatment of digested sludge using an aerobic bacterium. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 222-233.
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