Incorporating the influent cellulose fraction in activated sludge modelling

Reijken, Chris; Giorgi, Sara; Hurkmans, Claire; Pérez, Julio; Loosdrecht, Mark C.M. van

doi:10.1016/j.watres.2018.07.013

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…Reijken, Giorgi, Hurkmans, Pérez, and van Loosdrecht () incorporated the cellulose into activated sludge model (ASM1) to model the impact of cellulose sieving on the plant performance. The model considered cellulose as a separate state variable at 20% of the total COD.…”

Section: Introductionmentioning

confidence: 99%

Fate of cellulose in primary and secondary treatment at municipal water resource recovery facilities

Ahmed

Bahreini

et al. 2019

Water Environment Research

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Cellulose from toilet paper is a significant fraction of particulate organics, which is recoverable. For the first time, comprehensive mapping and tracking the fate of cellulose across various unit processes at full‐scale in two water resource recovery facilities located in North America and Europe was undertaken. The influent cellulose content accounted for approximately one‐third of the total suspended solids (TSS). Although about 80% of the raw wastewater cellulose was removed in primary treatment, the type of primary treatment process (rotating belt filter [RBF] vs. primary clarification [PC]) had a significant impact on cellulose capture and diversion. The high cellulose content of the RBF sludge accounting for 35% of the TSS facilitates cellulose recovery. For the North American plant, with a conventional activated sludge process (SRT of 6–7 days, preceded by PC), cellulose biodegradation efficiencies of 70%–90% of the PC effluent were observed in summer and winter. For the European plant, with a modified University of Cape Town process (SRT of 14 days, without primary treatment in train 2, or preceded by RBF in train 1), comparable cellulose biodegradation efficiencies were also observed. Results from laboratory SBRs indicated that cellulose biodegradation efficiency at room temperature was 86% of the influent cellulose. Practitioner points Cellulose fate was tracked across two different WWTPs in two different geographies. Cellulose in the influent wastewater accounted for 1/3 of the total suspended solids. Primary treatments were able to capture more than 80% of the influent cellulose. Cellulose was biodegraded in secondary treatment, resulting an effluent of 2–3 mg/L.

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Section: Introductionmentioning

confidence: 99%

Fate of cellulose in primary and secondary treatment at municipal water resource recovery facilities

Ahmed

Bahreini

et al. 2019

Water Environment Research

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“…In line with this and from the point of view of the ASMs, cellulose could simply be modelled by adding a very slowly biodegradable fraction in the ASM. 79 Recent modelling studies pointed out the specificities of the slow hydrolysis kinetics of cellulosic solids. 80,81 Contrary to conventional hydrolysis in ASM, considering the specific hydrolytical active biomass for such material is crucial.…”

Section: Cellulose Fibresmentioning

confidence: 99%

Resource recovery and wastewater treatment modelling

Solon

Volcke

Spérandio

et al. 2019

Environ. Sci.: Water Res. Technol.

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“…To increase WWTP efficiency while increasing resource recovery capacity, new technologies were developed and applied during the first stages of the main stream (Reijken et al, 2018;Larriba et al, 2020). A part from the direct impacts on resource recovery, these technologies also have indirect impacts on the efficiency of the subsequent stages; they significantly reduce the chemical oxygen demand (COD) and total solids (TS) content and consequently, reduce the aeration needs and the amount of sewage sludge produced, translating into important energy savings.…”

Section: Introductionmentioning

confidence: 99%

Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment

et al. 2021

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This study assesses the technological, environmental and economic feasibility of biodrying to valorise cellulosic sludge as a renewable energy source. Specifically, three different aeration strategies were compared in terms of biodrying performance, energetic consumption, gaseous emissions, quality of end-products and technoeconomic analysis. These strategies were based on different combinations of convective drying with biogenic heat produced. Two innovative biodrying performance indicators (Energetic Biodrying Index and Biodrying Performance Index) were proposed to better assess the initial and operational conditions that favour the maximum energy process efficiency and the highest end-product quality. The end-products obtained consistently presented moisture contents below 40% and lower heating values above 9.4 MJ•kg-1.However, the best values achieved were 32.6% and 10.4 MJ•kg-1 for moisture content and lower heating value, respectively. Low N2O and CH4 emissions confirmed the effective aeration of all three strategies carried out, while NH4 and tVOCs were related either to temperature or biological phenomena. A techno-economic analysis proved the economic viability and attractiveness of the biodrying technology for cellulosic sludge in all the strategies applied.

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Incorporating the influent cellulose fraction in activated sludge modelling

Cited by 18 publications

References 20 publications

Fate of cellulose in primary and secondary treatment at municipal water resource recovery facilities

Fate of cellulose in primary and secondary treatment at municipal water resource recovery facilities

Resource recovery and wastewater treatment modelling

Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment

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