Investigation of activated sludge characteristics and their influence on simultaneous sludge minimization and nitrogen removal from an advanced biological treatment for tannery wastewater

Sodhi, Vijay; Bansal, Ajay; Jha, Mithilesh Kumar

doi:10.1016/j.eti.2021.102013

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…In contrast, scheme A induced cell lysis and destructuration of the extracellular matrix as the main mechanisms, although the uncoupling metabolism continued to have a marginal effect on the process [31]. According to other studies, the increase of anaerobic HRT promoted the onset of bacterial lysis and increased EPS destructuration [31,32].…”

Section: Efficiency Of Excess Sludge Minimization and Insights On Mec...mentioning

confidence: 90%

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Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Corsino

Trapani

Marines

et al. 2023

Water

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The present study evaluated different sludge-reduction mechanisms in the oxic-settling-anaerobic (OSA) process in terms of their effects on methane productivity by anaerobic digestion of sewage sludge. Two different layouts were investigated for the sludge return from an anaerobic side-stream reactor (ASSR) to the anoxic (scheme A) or the aerobic (scheme B) reactor of a pre-denitrification plant. Biochemical methane-potential (BMP) assays performed on the excess sludge revealed that scheme A promoted an overall increase of methane production in the OSA (20 mLCH4 gVSS−1d−1, +19%), although compared with a control CAS plant a significant decrease in the excess sludge production (31%) was obtained. Operating conditions in scheme A caused the occurrence of cell lysis and EPS hydrolysis, thereby increasing the biodegradability of sludge. In contrast, scheme B favoured the occurrence of uncoupling and a maintenance metabolism that did not involve sludge hydrolysis. Consequently, despite a higher reduction of excess sludge (82%), a significant decrease in methane productivity in the OSA (4 mLCH4 gVSS−1d−1, −41%) was observed. Based on the results, implementing the OSA process may allow high levels of methane production by anaerobic digestion to be maintained if specific sludge-reduction mechanisms are triggered in the waterline, also raising the possibility of co-digestion with other feedstocks.

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Section: Efficiency Of Excess Sludge Minimization and Insights On Mec...mentioning

confidence: 90%

“…Therefore, prolonged exposure to unaerated conditions caused by the sludge cycling between the ASSR and the anoxic reactor in scheme A was responsible for cell lysis, confirmed by the increase of the soluble microbial product in the bulk [32].…”

Section: Efficiency Of Excess Sludge Minimization and Insights On Mec...mentioning

confidence: 93%

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Corsino

Trapani

Marines

et al. 2023

Water

View full text Add to dashboard Cite

show abstract

“…The high contaminant loads of this wastewater, as well as the diversity of substances present in it, have led to explore different treatment techniques to decontaminate them and carry out discharges with a lower environmental impact on the receiving body of water. Some of the techniques used to treat wastewater from the tanning sector are electrocoagulation [4], aerobic biological treatment [5], anaerobic biological treatment [6], clarification by coagulation, flocculation, and sedimentation [7], advanced oxidation processes [8],…”

Section: Introductionmentioning

confidence: 99%

Impacto de la densidad de plantación en la eficacia de humedales artificiales a escala de laboratorio plantados con Limonium Perezzi para el tratamiento de aguas residuales de curtiembres

et al. 2022

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Se analizó el efecto de la densidad de plantación de la especie Limonium perezzi sobre la efectividad de humedales artificiales a escala de laboratorio para el tratamiento de aguas residuales de la etapa de remojo en curtiembres. La densidad de plantación fue de 10.27 plantas/m2 (HAP4) y 15.4 plantas/m2 (HAP6), el tiempo de retención hidráulica en cada humedal fue de 4.5 días y los experimentos fueron realizados por 32 días, tiempo en el que las plantas comenzaron a marchitarse, dentro de los cuales fueron tomadas muestras de agua para el respectivo análisis. Los humedales fueron operados por 8 semanas a fin de observar el deterioro de estas con respecto al tiempo. El periodo de estabilización de los humedales varió entre 7 y 10 días hasta que la concentración del efluente fue poco variable. El análisis estadístico de los resultados indica que la densidad de plantación influye sobre la efectividad del humedal en términos de porcentaje de disminución de concentración, los humedales plantados con 15.4 plantas/m2 fueron más eficientes, lo cual se determinó a partir de la prueba T de Student (p < 0.05). Los porcentajes de disminución de la demanda química de oxígeno, cloruros y sólidos disueltos totales para la mayor densidad de plantación fueron de 81 %, 54 % y 55 % respectivamente. Al igual que en estudios previos, se observó que la especie plantada tiene la habilidad de tomar sal y liberarla a través de hojas y tallos, hecho que se pudo apreciar a partir del séptimo día de operación.

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“…[Tab.5] Based on the above considerations, scheme A enabled the establishment of the uncoupling metabolism as reported in previous studies (Chen et al, 2003;Martins et al, 2020). According to other studies, the increase of the anaerobic HRT promoted the onset of bacterial lysis and increased the EPS destructuration (Fida et al, 2021;Sodhi et al, 2021). Consequently, despite about 12-30% of sludge reduction could be achieved, the worsening of nitrification and sludge settling properties represented potential alarming drawbacks in terms of overall system performance.…”

mentioning

confidence: 98%

Insights on mechanisms of excess sludge minimization in an oxic-settling-anaerobic process under different operating conditions and plant configurations

et al. 2023

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Investigation of activated sludge characteristics and their influence on simultaneous sludge minimization and nitrogen removal from an advanced biological treatment for tannery wastewater

Cited by 14 publications

References 31 publications

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Impacto de la densidad de plantación en la eficacia de humedales artificiales a escala de laboratorio plantados con Limonium Perezzi para el tratamiento de aguas residuales de curtiembres

Insights on mechanisms of excess sludge minimization in an oxic-settling-anaerobic process under different operating conditions and plant configurations

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