Knowledge Agora



Similar Articles

Title Microbiological quality of sewage sludge after digestion treatment: A pilot scale case of study
ID_Doc 14694
Authors López, A; Rodríguez-Chueca, J; Mosteo, R; Gómez, J; Ormad, MP
Title Microbiological quality of sewage sludge after digestion treatment: A pilot scale case of study
Year 2020
Published
Abstract In the frame of the water circular economy, the reuse of the treated sewage sludge supposes a good action. Nevertheless, the reuse might suppose a human health risk because of the presence of pathogen germs, concentrated in the generated sludge during urban wastewater treatment. For this reason, sludge treatments, conventional or advanced, should be focused on the reduction of fermentation capacity and microorganisms presence. This research assess the microbiological quality of the treated sludge, based on the use of faecal pollution indicators such as total coliforms, Escherichia coli, Enterococcus sp., Pseudomonas sp., Staphylococcus aureus and total mesophilic bacteria, after the application of different digestion treatments, and their final aptitude to be reused. Three different pilot scale plants were used: two anaerobic digestion plants with a volume of 2.75 m(3) working in mesophilic (35-37 degrees C) and thermophilic (55-57 degrees C) conditions, and hydraulic retention times (HRT) ranging from 5 to 20 days; and a autothermal thermophilic aerobic digestion plant (ATAD) with a volume of treatment of 3.9 m(3) working at 55-57 degrees C for an HRT of 5-15 days. The raw sludge to be treated came from a full-operative WWTP located in the region of Navarra (Spain), laid within Ebro River Basin. It was concluded that both treatments studied obeyed the current European legislation in therms of E. coli concentration and absence of Salmonella spp., being available for agricultural purposes. Considering other microbiological parameters, the anaerobic thermophilic treatment had the best conditions to reduce the Enterococcus sp. concentrations and the aerobic thermophilic treatment was the best one reducing E. coli, being non-significant the influence of HRT to microbial reduction. For this reason, it is strongly recommended the use of both faecal indicators to assess the microbial quality of the treated sludge. (C) 2020 Elsevier Ltd. All rights reserved.
PDF

Similar Articles

ID Score Article
18797 Malcheva, BZ; Petrov, PG; Stefanova, VV Microbiological Control in Decontamination of Sludge from Wastewater Treatment Plant(2022)Processes, 10.0, 2
9218 Santos, AF; Santos, CP; Matos, AM; Cardoso, O; Quina, MJ Effect of Thermal Drying and Chemical Treatments withWastes on Microbiological Contamination Indicators in Sewage Sludge(2020)Microorganisms, 8.0, 3
18122 Sillero, L; Solera, R; Perez, M Improvement of the anaerobic digestion of sewage sludge by co-digestion with wine vinasse and poultry manure: Effect of different hydraulic retention times(2022)
6659 Krohn, C; Khudur, L; Dias, DA; van den Akker, B; Rees, CA; Crosbie, ND; Surapaneni, A; O'Carroll, DM; Stuetz, RM; Batstone, DJ; Ball, AS The role of microbial ecology in improving the performance of anaerobic digestion of sewage sludge(2022)
6129 Ferrer, I; Passos, F; Romero, E; Vázquez, F; Font, X Optimising sewage sludge anaerobic digestion for resource recovery in wastewater treatment plants(2024)
14806 Hurynovich, A; Kwietniewski, M; Romanovski, V Evaluation of the possibility of utilization of sewage sludge from a wastewater treatment plant - case study(2021)
26883 Garlicka, A; Kupidura, P; Krawczyk, P; Umiejewska, K; Muszynski, A Re-flocculation reduces the effectiveness of sewage sludge pretreatment through hydrodynamic disintegration prior to anaerobic digestion(2023)
16365 Santos, AF; Alvarenga, P; Quina, MJ; Gando-Ferreira, LM Agronomic valorization of sewage sludge: The potential of thermal drying to achieve sanitation and biological stability(2022)
17952 Vouk, D; Nakic, D; Bubalo, A; Bolanca, T Environmental Aspects In Selecting Optimum Variant Of Sewage Sludge Management(2022)Environmental Engineering And Management Journal, 21, 3
23731 Valchev, D; Ribarova, I; Borisov, B; Radovanov, V; Lyubomirova, V; Kostova, I; Dimova, G; Karpuzova, O; Lazarova, S Valuable elements in sludge from eight municipal wastewater treatment plants in relation to their recovery potential(2024)Environmental Sciences Europe, 36, 1
Scroll