Ecological risk assessment of sewage sludge from municipal wastewater treatment plants: a case study

2018 ◽  
Vol 53 (13) ◽  
pp. 1167-1176 ◽  
Author(s):  
Zygmunt M. Gusiatin ◽  
Dorota Kulikowska ◽  
Barbara K. Klik ◽  
Karolina Hajdukiewicz
Keyword(s):  
Risk Assessment ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plants

Evaluating the stabilisation degree of digested sewage sludge: investigations at four municipal wastewater treatment plants

2006 ◽  
Vol 53 (8) ◽  
pp. 81-90 ◽  
Author(s):  
V. Parravicini ◽  
E. Smidt ◽  
K. Svardal ◽  
H. Kroiss
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Aerobic Conditions ◽  
Specific Oxygen Uptake Rate ◽  
Municipal Wastewater Treatment Plants ◽  
Digested Sewage Sludge

Further reduction of volatile suspended solids (VSS) during a post-stabilisation step was applied to evaluate the stabilisation degree of digested sewage sludge. For this purpose digested sludge was collected at four municipal wastewater treatment plants (WWTPs) and further stabilised in lab-scale chemostat reactors either under anaerobic or aerobic conditions. Experimental results showed that even in adequately digested sludge a consistent amount of VSS was degraded during aerobic post-stabilisation. It seems that aerobic conditions play a significant role during degradation of residual VSS. Additionally, specific VSS production (gVSS/peCOD110.d) as well as specific oxygen uptake rate were shown to be suitable parameters to assess the degree of sludge stabilisation at WWTPs. Fourier transform infrared spectroscopy was used to reveal changes in the sludge composition. Spectra of treated and untreated sludge samples indicated that the major component of residual VSS in stabilised sludge for instance consisted of biomass, while cellulose was absent.

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