厌氧消化酸抑制研究进展

Research progress in acid inhibition in anaerobic digestion

摘要:

厌氧消化工艺目前已广泛应用于各类废水的处理处置过程中，但在实际运行中，受消化条件和物料性质的影响，消化系统经常遭受由挥发性脂肪酸积累过多导致的酸抑制问题，引发产气量下降、产甲烷率降低等问题。近年来，有研究者发现，挥发性脂肪酸的种类和浓度及pH、温度是影响酸抑制的主要因素。基于此，相关研究者分别尝试了添加碱性化学药剂和微量元素及利用生物强化技术与微生物电化学技术来解除酸抑制的尝试，并都取得了不错的效果。本文综述了厌氧消化过程中酸抑制的产生过程、抑制机理及恢复方法，以期为解决厌氧消化酸抑制问题提供参考。

Abstract:

Anaerobic digestion process is widely used in the treatment and disposal of various types of wastewater. But in actual operation, the digestion system often suffers from acid inhibition caused by excessive accumulation of volatile fatty acids due to the influence of digestion conditions and material properties. It causes problems such as decreased gas and methane production. In recent years, some researchers have found that the type and concentration of volatile fatty acid, pH and temperature are the main factors affecting acid inhibition. Based on this point, the methods of adding alkaline chemicals, adding trace elements, using bioaugmentation technology and microbial electrochemical technology have been used to relieve acid inhibition. We review here the production process, inhibition mechanism and recovery method of acid inhibition in the anaerobic digestion process, to provide references for solving the acid inhibition problem in anaerobic digestion.