Determining the limits of anaerobic co-digestion of thickened waste activated sludge with grease interceptor waste

Wang, Ling; Aziz, Tarek N.; Reyes, Francis L. de los

doi:10.1016/j.watres.2013.04.003

Cited by 101 publications

(40 citation statements)

References 28 publications

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“…This strategy would not only represent a significant process cost reduction (further discussed below), but also improve the sludge and wastewater treatment efficiency, enabling maximum resource (iron) reuse while achieving improved methane production. In addition, from a network-wide view, commonly used ferric iron dosing in sewers for H 2 S control 42 might also be useful for CH 4 production enhancement during anaerobic digestion and phosphors removal in the WWTP.…”

Section: Resultsmentioning

confidence: 99%

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

Liu¹,

Wang²,

Zhang³

et al. 2016

Environmental Engineering and Activated Sludge Processes

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Anaerobic digestion has been widely applied for waste activated sludge (WAS) treatment. However, methane production from anaerobic digestion of WAS is usually limited by the slow hydrolysis rate and/or poor biochemical methane potential of WAS. This work systematically studied the effects of three different types of zero valent iron (i.e., iron powder, clean scrap and rusty scrap) on methane production from WAS in anaerobic digestion, by using both experimental and mathematical approaches. The results demonstrated that both the clean and the rusty iron scrap were more effective than the iron powder for improving methane production from WAS. Model-based analysis showed that ZVI addition significantly enhanced methane production from WAS through improving the biochemical methane potential of WAS rather than its hydrolysis rate. Economic analysis indicated that the ZVI-based technology for enhancing methane production from WAS is economically attractive, particularly considering that iron scrap can be freely acquired from industrial waste. Based on these results, the ZVI-based anaerobic digestion process of this work could be easily integrated with the conventional chemical phosphorus removal process in wastewater treatment plant to form a cost-effective and environment-friendly approach, enabling maximum resource recovery/reuse while achieving enhanced methane production in wastewater treatment system. L arge amounts of organic matter from wastewater are converted into waste activated sludge (WAS) during biological treatment processes in wastewater treatment plants (WWTPs)1 . Anaerobic digestion of WAS has been widely applied to stabilize and reduce the volume of WAS as well as produce a renewable bioenergy resource in the form of methane 2-5 . The anaerobic digestion process generally consists four stages, i.e. hydrolysis, fermentation, acetogenesis and methanogenesis for methane production 6 . However, the application of anaerobic digestion is often limited by the slow hydrolysis rate and/or poor biochemical methane potential (or degradation extent) of the WAS 7-11 . In order to effectively enhance methane production from WAS in anaerobic digestion, a number of strategies have been developed, such as thermal, chemical, and mechanical methods [12][13][14][15][16][17][18][19][20][21] . However, most of these methods are cost intensive owing to high energy input or large chemical requirements 7,22,23 . Thus, alternative cost-effective approach to improve methane production from WAS in anaerobic digestion process is highly desired.Zero valent iron (ZVI), a cheap reducing agent, has been widely used in wastewater pretreatment, groundwater purification and soil remediation 24,25 . Recent studies have found that ZVI addition in anaerobic reactors for biological wastewater treatment could significantly improve chemical oxygen demand (COD) removal by ca. 25% [26][27][28][29] . Indeed ZVI can lower oxidation-reduction potential and serve as an acid buffer, thus helping maintain a stable and favourable condition for methan...

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Section: Resultsmentioning

confidence: 99%

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

Liu¹,

Wang²,

Zhang³

et al. 2016

Environmental Engineering and Activated Sludge Processes

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“…Die Co-Vergärung von Fettabfäl-len auf Kläranlagen steigert bis zu einer gewissen Zugabemenge den Biogasertrag deutlich, sowohl hinsichtlich der Menge als auch des Methananteils im Biogas (Davidsson et al 2008; Del Mundo und Sutheerawattananonda 2017) und ist daher weit verbreitet (DWA-M380 2009). Wang et al (2013) (Long et al 2012).…”

Section: Einführungunclassified

Energetische Nutzung von Fettabscheiderinhalten – Potenzial zur Erzeugung von Biodiesel und Biogas

Lichtmannegger

Kinzel

Müller

et al. 2018

Österr Wasser- und Abfallw

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“…Grease trap waste (GTW) from a grease trap commonly installed inside the food service establishments (Wang et al, 2013;AguilarGarnica et al, 2014), has become a major stream of organic waste in urban areas. Landfill of this waste is no longer permitted in many jurisdictions (Razaviarani et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The direct drainage into the collection system is also illegal in most municipalities, because it can accumulate on pipe walls, and potentially form hardened deposits through a chemical reaction or a physical aggregation process (He et al, 2011). It was responsible for up to 47% of the reported blockages and 50e75% of sanitary sewer overflows as it tends to solidify, reduce conveyance capacity, and eventually block flow (Wang et al, 2013;Iasmin et al, 2014). Millions of dollars each year have to be spent in cleaning, repairing, and maintenance of the pipes.…”

Section: Introductionmentioning

confidence: 99%

“…GTW is often high in biodegradable volatile solids (VS) ranging from 17% to 93% (w/w) and chemical oxygen demand (COD) up to 1,211 kg m À3 (Wang et al, 2013). Conversion of oily content in GTW to biodiesel is widely studied because of concerns relating to the quality of the feedstock, specifically the presence of high moisture content and free fatty acids (Felizardo et al, 2006;Montefrio et al, 2010;Toba et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Recovery strategies of inhibition for mesophilic anaerobic sludge treating the de-oiled grease trap waste

Kobayashi

Kuramochi

et al. 2015

International Biodeterioration & Biodegradation

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Determining the limits of anaerobic co-digestion of thickened waste activated sludge with grease interceptor waste

Cited by 101 publications

References 28 publications

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

Energetische Nutzung von Fettabscheiderinhalten – Potenzial zur Erzeugung von Biodiesel und Biogas

Recovery strategies of inhibition for mesophilic anaerobic sludge treating the de-oiled grease trap waste

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