微好氧预处理对市政污泥厌氧消化产甲烷的影响

针对目前市政污泥处理资源化与减量化效率低的问题，利用微好氧预处理技术进行预处理，提高其甲烷产量。利用有机物溶出效率、VSS减量、甲烷产量3项指标对预处理效果进行了评价；研究了不同参数条件下微好氧预处理对市政污泥厌氧消化产甲烷的影响；探讨了微好氧预处理对污泥胞外聚合物的影响。结果表明，微好氧预处理可以促进污泥溶解性有机物释放、提高VSS去除率；在最佳反应条件下(曝气强度0.30 m³·(min·m³)⁻¹、预处理时间12 h)，相对于未经过预处理的工况，甲烷产量可提高26.77%；微好氧预处理对剩余污泥活性细胞的影响主要发生在胞外聚合物部分，同时也存在对活性微生物的破解作用。市政污泥经过微好氧预处理后，可有效提升后续中温厌氧消化或高温厌氧消化的甲烷产量。

Effect of microaerobic pretreatment on municipal sludge anaerobic digestion and methane production

Aiming at low efficiency of municipal sludge resource reuse and reduction, microaerobic pretreatment was used to improve the methane production from municipal sludge. The pretreatment effect was evaluated by soluble organic dissolved rate, VSS reduction and methane production efficiency. The effects of microaerobic pretreatment on anaerobic digestion of municipal sludge under different conditions and extracellular polymeric substances were studied. The results indicated that microaerobic pretreatment could promote the release of soluble organic matter in municipal sludge and improve the removal efficiency of VSS. Under the optimal reaction conditions: aeration intensity of 0.30 m3·(min·m3)−1, pretreatment time of 12 h, the methane production increased by 26.77% with comparison with the sludge without pretreatment. The effect of microaerobic pretreatment on cells in excess activated sludge mainly occurred on the extracellular polymeric substances(EPS) and the disintegration of microorganisms. Microaerobic pretreatment could cause the significant increase of methane production rate of mesophilic and thermophilic anaerobic digestion.