污泥处理过程中溶解性有机物特性的变化

Changes in the Properties of Dissolved Organic Matter During Sludge Treatment

污泥的溶解性有机物(DOM)是由高相对分子质量和低相对分子质量的有机物质组成的异质混合物,包括蛋白质化合物、碳水化合物、腐殖质、脂质、木质素、有机酸、有机微污染物和其他在废水处理过程中产生的生物衍生物质。本文回顾了不同污泥处理过程中DOM的定义,组成,定量和转化,以及DOM与微生物群落的复杂相互作用。在厌氧消化中,厌氧消化-难降解的有机物,特别是具有多环类固醇,烷烃和芳香族结构的化合物,可以在预处理后生成。在脱水过程中,低相对分子质量蛋白质(<20000 Da)的DOM分数是降低污泥脱水能力的关键参数。在堆肥过程中,DOM会发生分解和聚合,随后形成腐殖质。在土地处理过程中,DOM的成分,特别是腐殖质,与渗滤液的质量有关。最后,为更好地理解污泥处理过程中DOM的转化和降解提出了建议。污泥研究的未来工作需要建立和实施样品处理的定义以及DOM分析方法的标准化,包括样品制备和分馏以及数据整合。更详细地了解污泥中的DOM有助于污泥处理技术的运行和优化。

Dissolved organic matter(DOM)in sludge is a heterogeneous mixture of high to low molecular weight organic substances including protein compounds,carbohydrates,humic substances,lipids,lignin,organic acids,organic micropollutants,and other biologically derived substances produced during wastewater treatment.This paper provides an overview of the definition,composition,quantification and transformation of DOM in different sludge treatment processes and the complex interactions of DOM with microbial communities.In anaerobic digestion,anaerobically digested-refractory organic matter,especially compounds with polycyclic steroids,alkanes and aromatic structures,can be generated after pretreatment.In dewatering,DOM fraction of low molecular weight proteins(<20000 Da)is a key parameter that reduces sludge dewatering capacity.During composting,DOM undergoes decomposition and polymerization,followed by humus formation.During land treatment,the composition of DOM,especially humus,is related to the quality of the leachate.Finally,recommendations are made to better understand the transformation and degradation of DOM during sludge treatment.Future work in sludge research needs to establish and implement definitions of sample handling and standardization of methods for DOM analysis,including sample preparation and fractionation and data integration.A more detailed understanding of DOM in sludge can help in the operation and optimization of sludge treatment technologies.