Identification of recalcitrant compounds in a pilot-scale AB system: An adsorption (A) stage followed by a biological (B) stage to treat municipal wastewater

Trzcinski, Antoine P.; Ganda, Lily; Ni, Annie Soh Yan; Kunacheva, Chinagarn; Zhang, Qing; Li, Lin; Tao, Guihe; Lee, Yingjie; Ng, Wun Jern

doi:10.1016/j.biortech.2016.01.048

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…Thus, a full-scale HiCS system could potentially achieve an energy recovery of more than twice as high as that of a CAS system. It should be noted that the methane yield from HRAS sludges may differ depending on the type of sludge, wastewater, and anaerobic digestion conditions, and values between 44% and 73% COD methane COD sludge‑fed –1 have been reported. ,− Digestibility experiments of HiCS sludge should therefore be performed to estimate of the energy recovery potential of the HiCS system under various conditions.…”

Section: Discussionmentioning

confidence: 99%

Live Fast, Die Young: Optimizing Retention Times in High-Rate Contact Stabilization for Maximal Recovery of Organics from Wastewater

Meerburg

Boon

Winckel

et al. 2016

Environ. Sci. Technol.

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Wastewater is typically treated by the conventional activated sludge process, which suffers from an inefficient overall energy balance. The high-rate contact stabilization (HiCS) has been proposed as a promising primary treatment technology with which to maximize redirection of organics to sludge for subsequent energy recovery. It utilizes a feast-famine cycle to select for bioflocculation, intracellular storage, or both. We optimized the HiCS process for organics recovery and characterized different biological pathways of organics removal and recovery. A total of eight HiCS reactors were operated at 15 °C at short solids retention times (SRT; 0.24-2.8 days), hydraulic contact times (tc; 8 and 15 min), and stabilization times (ts; 15 and 40 min). At an optimal SRT between 0.5 and 1.3 days and tc of 15 min and ts of 40 min, the HiCS system oxidized only 10% of influent chemical oxygen demand (COD) and recovered up to 55% of incoming organic matter into sludge. Storage played a minor role in the overall COD removal, which was likely dominated by aerobic biomass growth, bioflocculation onto extracellular polymeric substances, and settling. The HiCS process recovers enough organics to potentially produce 28 kWh of electricity per population equivalent per year by anaerobic digestion and electricity generation. This inspires new possibilities for energy-neutral wastewater treatment.

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Section: Discussionmentioning

confidence: 99%

Live Fast, Die Young: Optimizing Retention Times in High-Rate Contact Stabilization for Maximal Recovery of Organics from Wastewater

Meerburg

Boon

Winckel

et al. 2016

Environ. Sci. Technol.

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“…Therefore, sludge from the USAS process is also considered to be a potential raw material for energy recovery. Studies by Trzcinski et al 12 and Meerburg et al 13 suggested that sludge obtained from the A stage achieved a higher methane yield than that from B stage by 1.4–1.9 times during the anaerobic digestion process. However, few studies have focused on the analysis of lipids from USAS sludges.…”

Section: Introductionmentioning

confidence: 99%

Characterization and reutilization potential of lipids in sludges from wastewater treatment processes

Liu

Luo

et al. 2020

Sci Rep

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Lipids in sewage sludge are considered to be high-class raw materials for biodiesel or other valuable products. We profiled the characteristics and assessed the reutilization potential of lipids from different sludge sources, including sludge from the primary sedimentation tank (PST sludge) and sludge from the secondary sedimentation tank in a conventional activated sludge system (CAS sludge), as well as sludge from ultrashort-sludge retention time (SRT) activated sludge systems with different SRTs (USAS sludge, with SRTs of 0.5, 1.0, 2.0, 3.0 and 4.0 d). The results showed that the lipids in the sludges were mainly composed of cellular lipids, free fatty acids (FFAs), wax and gum. The highest lipid content was found in the PST sludge (156.8 ± 11.9 mg/g, dry basis), followed by the USAS sludges (67.9 ± 11.0-132.2 ± 11.8 mg/g) and the CAS sludge (46.0 ± 16.5 mg/g). Lipid species such as Cer, So, PE, PC, and TG were abundant, comprising over 80% of the cellular lipids in the sludges. With higher lipid contents, the PST sludge and USAS sludge (0.5 d SRT) were suggested to have a higher reutilization potential for use in producing biodiesel. In addition, the CAS sludge was promising for resource reutilization and energy recovery due to the large amount of excess sludge. By the end of June 2017, over 3,700 wastewater treatment plants (WWTPs) 1 had been built and operated in China, and a large amount of sludge was produced each year. Based on a report from the China Statistical Yearbook on Environment (2018), the yield of municipal sludge with 80% moisture content increased from 33.18 billion tons in 2008 to 49.24 billion tons in 2017 1. Thus, sludge treatment has become an urgent issue in China, and the main treatment method is landfilling. However, sludges from the primary and secondary sedimentation tanks in WWTPs contain a large amount of organic matter 2 , which has the potential for resource and energy recovery. In particular, the concentration of lipids in sludge has been reported to be high, accounting for approximately 20% of the organic matter 3 , and thus, lipids are considered to be a potential feedstock for use in diesel production 4-8. The lipids in municipal sewage sludge include cellular lipids, free fatty acids, wax and gum, the contents and diesel production potential of which are affected by the sludge source. It has been reported that the biodiesel yield of sludge from the primary sedimentation tank (PST) is much higher than that of sludge from the secondary sedimentation tank in the conventional activated sludge (CAS) process due to substrate utilization by the metabolism of microorganisms in the bioreactor 9. One possible approach to achieve resource recovery from sludge in WWTPs is to prevent the substrates from being utilized by microorganisms by reducing the sludge retention time (SRT) in the CAS process. Recently, an ultrashort-SRT activated sludge (USAS) process was developed for organic recovery; this process originates from the A stage of the adsorption-biodegradation (AB) process, where th...

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“…Anaerobic digestion of sludge obtained from an A-stage process (Asludge) has previously been compared to that of WAS and/or sludge obtained from the B-stage (B-sludge) (Trzcinski et al, 2016;Cagnetta et al, 2017). Notably, WAS and B-sludge are originating from reactors operated at long SRTs, resulting in decreased sludge biodegradability (Bolzonella et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Primary and A-sludge treatment by anaerobic membrane bioreactors in view of energy-positive wastewater treatment plants

Abdelrahman

Aras

Cicekalan

et al. 2022

Bioresource Technology

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Identification of recalcitrant compounds in a pilot-scale AB system: An adsorption (A) stage followed by a biological (B) stage to treat municipal wastewater

Cited by 18 publications

References 21 publications

Live Fast, Die Young: Optimizing Retention Times in High-Rate Contact Stabilization for Maximal Recovery of Organics from Wastewater

Live Fast, Die Young: Optimizing Retention Times in High-Rate Contact Stabilization for Maximal Recovery of Organics from Wastewater

Characterization and reutilization potential of lipids in sludges from wastewater treatment processes

Primary and A-sludge treatment by anaerobic membrane bioreactors in view of energy-positive wastewater treatment plants

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