剩余污泥中木质纤维素稳定并转化能源可行性分析

剩余污泥中往往含有大量木质纤维素物质,在厌氧消化过程中难以降解,最终被浓缩于熟污泥中,这就是导致污泥有机物稳定并转化能源效率低下的主要原因之一.本文分析了剩余污泥中木质纤维素的含量与来源;阐述了木质纤维素的结构特点以及对其生物降解的关键技术所在;揭示了污泥常规预处理与木质纤维素预处理存在工艺条件不同的相似技术.文章结合两种预处理技术的特点和工艺条件,从原理、技术等角度分析了通过强化剩余污泥预处理而同时达到破解木质纤维素的技术思路.为此,提出了将污泥细胞破碎与木质纤维素破解耦合的观点,以期将污泥中木质纤维素的稳定与能源转化合二为一,从而构建木质纤维素稳定化、能源化与碳减排三位一体的技术策略

Feasibility analyses of stabilization and energy conversion of lignocelluloses contained in excess sludge

Excess sludge usually contains a lot of lignocelluloses materials, and lignocelluloses are hardly degraded and thus are concentrated in digested sludge. This leads to quite low stabilized and converted efficiencies of organics in sludge. In this study, the content and origin of lignocelluloses are analyzed; the structural characteristics and degraded technical cruxes of lignocelluloses are elucidated; and similar pretreatment processes with different operational parameters are revealed for conventional sludge pretreatment and lignocelluloses pretreatment. Based on the characteristics and process parameters of two pretreatment methods, the technical pathways of enhanced sludge pretreatment with simultaneous lignocelluloses destruction are analyzed both theoretically and practically. Therefore, we propose a solution by coupling cell disruption with lignocelluloses destruction, in an attempt to combine stabilization and energy conversion in a single process and to build up technical measures for simultaneous stabilization, energy conversion and carbon emission reduction of lignocelluloses.