Recovery strategies of inhibition for mesophilic anaerobic sludge treating the de-oiled grease trap waste
Recovery strategies of inhibition for mesophilic anaerobic sludge treating the de-oiled grease trap waste
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DOI：
10.1016/j.ibiod.2015.06.020
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发表时间：
2015-10
影响因子：
4.8
通讯作者：
Li-Jie Wu;Takurou Kobayashi;H. Kuramochi;Y. Li;Kaiqin Xu
中科院分区：
文献类型：
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作者：
Li-Jie Wu;Takurou Kobayashi;H. Kuramochi;Y. Li;Kaiqin Xu
除油隔油池废物（GTW）可以作为厌氧消化的可行基质。然而，由于高浓度的油脂，长链脂肪酸（LCFA）作为油脂厌氧降解的中间产物，容易抑制厌氧消化，导致厌氧消化恢复期长。四种恢复策略：采用膨润土投加、水稀释、与低LCFA基质混合、与接种物混合等方法，并与对照试验进行比较，以加速中温厌氧污泥的回收过程。通过添加膨润土、80%混合比水稀释和与活性接种剂混合，缩短了回收过程。对照试验的整个恢复时间约为3.5个月，根据F/I比为0.4时重新加入脱油燃气轮机后滞后时间的开始至结束计算。至少10 g l− 1的膨润土添加是必要的抑制污泥的快速恢复，与整个恢复时间比对照测试短一个月。1.5采用80%混合比的水稀释策略，整个回收过程可节省3个月。接种量越大，污泥恢复期越短。采用80%混合接种的方法，整个恢复过程仅需20天。
De-oiled grease trap waste (GTW) could be a feasible substrate for anaerobic digestion. However, due to high concentration of lipid, the long-chain fatty acid (LCFA), as an intermediate in the anaerobic lipid degradation, easily inhibits the anaerobic digestion, resulting in long recovery period. Four recovery strategies: bentonite addition, water dilution, mixing with low LCFA substrate and mixing with inocula, with control test as comparison, were employed in order to accelerate the recovery process of mesophilic anaerobic sludge. Adding bentonite, water dilution with 80% mixing ratio and mixing with active inocula achieved shortening of the recovery process. The whole recovery time took approximately 3.5 months for the control test, as calculated from the beginning to the end of the lag time after de-oiled GTW was re-added as F/I ratio of 0.4. At least 10 g l−1of bentonite addition was necessary for the fast recovery of the inhibited sludge, with the whole recovery time one month shorter than the control test. 1.5 months could be saved for the whole recovery process when the strategy of water dilution with 80% mixing ratio was considered. The more inocula were mixed with the inhibited sludge, the more the recovery period was lessened. For the strategy of mixing with inocula with the mixing ratio 80%, only 20 days were needed for the whole recovery process.