Performance of the biosorptive activated sludge (BAS) as pre-treatment to UF for decentralized wastewater reuse

Diamantis, Vasileios; Eftaxias, Alexandros; Bundervoet, Bert; Verstraete, Willy

doi:10.1016/j.biortech.2014.01.061

Cited by 36 publications

(7 citation statements)

References 31 publications

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“…As energy-efficiency and carbon footprint are becoming more and more important for wastewater treatment plants [12], high-rate activated sludge processes similar to the A-stage of an AB process are being investigated [13,14]. A high-rate activated sludge process with short solids retention time (SRT) is potentially more energy-efficient than a low-rate process with long SRT because less oxygen is needed per mass of organic material removed and more excess sludge is produced, which can be converted to biogas in an anaerobic digester.…”

Section: Introductionmentioning

confidence: 99%

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

et al. 2015

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New activated sludge processes that utilize sorption as a major mechanism for organics removal are being developed to maximize energy recovery from wastewater organics, or as enhanced primary treatment technologies. To model and optimize sorption-based activated sludge processes, further knowledge about sorption of organics onto sludge is needed. This study compared primary-, anaerobic-, and aerobic activated sludge as sorbents, determined sorption capacity and kinetics, and investigated some characteristics of the organics being sorbed. Batch sorption assays were carried out without aeration at a mixing velocity of 200 rpm. Only aerobic activated sludge showed net sorption of organics. Sorption of dissolved organics occurred by a near-instantaneous sorption event followed by a slower process that obeyed 1st order kinetics. Sorption of particulates also followed 1st order kinetics but there was no instantaneous sorption event; instead there was a release of particles upon mixing. The 5-min sorption capacity of activated sludge was 6.5±10.8 mg total organic carbon (TOC) per g volatile suspend solids (VSS) for particulate organics and 5.0±4.7 mgTOC/gVSS for dissolved organics. The observed instantaneous sorption appeared to be mainly due to organics larger than 20 kDa in size being sorbed, although molecules with a size of about 200 Da with strong UV absorbance at 215–230 nm were also rapidly removed.

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Section: Introductionmentioning

confidence: 99%

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

et al. 2015

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“…Reclaimed water, even tertiary treated, usually contains higher amount of DOM in regard to soluble microbial products, synthetic organic compounds, etc. with greater fluctuations (Ma et al, 2013;Diamantis et al, 2014;Farooq et al, 2015;Verstraete et al, 2016;Bustamante and Liao, 2017). Specifically, AOC concentrations in most treated drinking water (after coagulation and/or ozonation processes) are less than 500 μg/L, and over 80% of drinking water samples have AOC levels below 200 μg/L (Fig.…”

Section: Typical Aoc Levels Of Drinking Water and Reclaimed Watermentioning

confidence: 99%

Assimilable organic carbon (AOC) variation in reclaimed water: Insight on biological stability evaluation and control for sustainable water reuse

Chen

Ngo

et al. 2018

Bioresource Technology

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This review highlights the importance of conducting biological stability evaluation due to water reuse progression. Specifically, assimilable organic carbon (AOC) has been identified as a practical indicator for microbial occurrence and regrowth which ultimately influence biological stability. Newly modified AOC bioassays aimed for reclaimed water are introduced. Since elevated AOC levels are often detected after tertiary treatment, the review emphasizes that actions can be taken to either limit AOC levels prior to disinfection or conduct post-treatment (e.g. biological filtration) as a supplement to chemical oxidation based approaches (e.g. ozonation and chlorine disinfection). During subsequent distribution and storage, microbial community and possible microbial regrowth caused by complex interactions are discussed. It is suggested that microbial surveillance, AOC threshold values, real-time field applications and surrogate parameters could provide additional information. This review can be used to formulate regulatory plans and strategies, and to aid in deriving relevant control, management and operational guidance.

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“…Diamantis et al. ( 2014 ) operated a continuous reactor followed by a settler at an SRT of 0.3–0.5 day and HRT of 0.9 hr. Better COD removal efficiency (80%) was obtained at a high loading of 10–20 kg/m 3 · day compared to a low loading of 6.8 kg/m 3 · day.…”

Section: Emerging Process Configurations Dependent On Nonoxidative Rementioning

confidence: 99%

Nonoxidative removal of organics in the activated sludge process

Modin

Persson

Wilén

et al. 2016

Critical Reviews in Environmental Science and Technology

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The activated sludge process is commonly used to treat wastewater by aerobic oxidation of organic pollutants into carbon dioxide and water. However, several nonoxidative mechanisms can also contribute to removal of organics. Sorption onto activated sludge can remove a large fraction of the colloidal and particulate wastewater organics. Intracellular storage of, e.g., polyhydroxyalkanoates (PHA), triacylglycerides (TAG), or wax esters can convert wastewater organics into precursors for high-value products. Recently, several environmental, economic, and technological drivers have stimulated research on nonoxidative removal of organics for wastewater treatment. In this paper, we review these nonoxidative removal mechanisms as well as the existing and emerging process configurations that make use of them for wastewater treatment. Better utilization of nonoxidative processes in activated sludge could reduce the wasteful aerobic oxidation of organic compounds and lead to more resource-efficient wastewater treatment plants.

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Performance of the biosorptive activated sludge (BAS) as pre-treatment to UF for decentralized wastewater reuse

Cited by 36 publications

References 31 publications

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

Assimilable organic carbon (AOC) variation in reclaimed water: Insight on biological stability evaluation and control for sustainable water reuse

Nonoxidative removal of organics in the activated sludge process

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