Respiration and enzymatic activities as indicators of stabilization of sewage sludge composting

Waste Management
Mahnaz NikaeenAkbar Hassanzadeh

Abstract

The objective of this work was to study the evolution of physico-chemical and microbial parameters in the composting process of sewage sludge (SS) with pruning wastes (PW) in order to compare these parameters with respect to their applicability in the evaluation of organic matter (OM) stabilization. To evaluate the composting process and organic matter stability, different microbial activities were compared during composting of anaerobically digested SS with two volumetric ratios, 1:1 and 3:1 of PW:SS and two aeration techniques including aerated static piles (ASP) and turned windrows (TW). Dehydrogenase activity, fluorescein diacetate hydrolysis, and specific oxygen uptake rate (SOUR) were used as microbial activity indices. These indices were compared with traditional parameters, including temperature, pH, moisture content, organic matter, and C/N ratio. The results showed that the TW method and 3:1 (PW:SS) proportion was superior to the ASP method and 1:1 proportion, since the former accelerate the composting process by catalyzing the OM stabilization. Enzymatic activities and SOUR, which reflect microbial activity, correlated well with temperature fluctuations. Based on these results it appears that SOUR and the enzymatic a...Continue Reading

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Citations

Dec 15, 2015·Journal of the Air & Waste Management Association·Selnur Uçaroğlu, Ufuk Alkan
Oct 29, 2015·Environmental Monitoring and Assessment·Amir Hossein NafezSharareh Moghim
May 1, 2019·Microbial Ecology·Tatiana Robledo-MahónConcepción Calvo
Mar 12, 2020·International Journal of Environmental Research and Public Health·Hongwei ZhangKui Huang
Feb 8, 2020·Journal of Environmental Health Science & Engineering·Seyed Mostafa AghiliMohammad Ali Zazouli
Jan 16, 2021·Scientific Reports·Liqiang MengLi Chen

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