Changes in the Properties of Dissolved Organic Matter During Sludge Treatment
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(＜20 000 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.
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