Startup of Anaerobic Mesophilic Digesters

Hatzigeorgiou, Marialena; Owsenek, Brian; Alkema, Tom; Sieger, Ronald B.; Pallansch, Karen

doi:10.2175/193864706783710569

Cited by 4 publications

(5 citation statements)

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“…The COD removal efficiencies at 73 day of operation remain around these values up to 83 day of operation that indicating steady state condition. The COD removal efficiencies achieved at steady state is approximately consistent with that of Cacho [11] who conducted experimental work on mesophilic digester, operated at 20 day HRT, and the concentration of COD in the influent was 56 g/dm 3 . That digester achieved 46% COD removal.…”

Section: Resultssupporting

confidence: 84%

“…The above mentioned biogas production indicated that the digesters produced a significant amount of biogas after the first 55 days of operation, while the steady state operation was reached after 73 day. Hatzigeorgiou et al [3] reported that steady state of anaerobic digester during start-up was achieved after 116 day of operation. Kobayashi et al [1] evaluated the start-up of anaerobic digester of waste activated sludge applying internal inoculums.…”

Section: Resultsmentioning

confidence: 99%

“…Mesophilic anaerobic digestion is a biological process which requires time and careful management during start-up. Good planning, continuous monitoring and slow changes are _________________________ the three key factors for a successful start-up [3]. Careful monitoring and control of pH are essential until the digester attains pH in the 6.8-7.2 range [4].…”

Section: Introductionmentioning

confidence: 99%

“…Various strategies are utilized to start-up mesophilic digesters. Kobayashi et al [1] filled the digester with waste activated sludge (WAS) diluted to 15 g/dm 3 as total solid (TS) with tap water. At first, the reactor was operated in a batch mode.…”

Section: Introductionmentioning

confidence: 99%

“…The hydraulic retention time (HRT) was gradually shortened from 100 days through 50 days to 30 days. While Hatzigergiou et al [3] introduced two start-up strategies, the first strategy was used by the Upper Occoquan Sewage Authority (VA) which consists of the following: the digester was filled with primary sludge and seed. Unfortunately there are no data available on the exact amount of seed used.…”

Section: Introductionmentioning

confidence: 99%

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Start Up Performance Of A Mesophilic Anaerobic Digester Without External Inoculums

Dohdoh

Aboulfotoh

2017

Environ. Protect. Eng.

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The objective of anaerobic digester start-up is to achieve steady-state operation and the required reduction performance in the shortest possible time. The present study aims to assess a novel strategy to start-up pilot scale mesophilic anaerobic digester with internal inoculums; the operational parameters such as feed concentration and operating temperature were also evaluated. Three pilot scale anaerobic digester systems were designed and manufactured. They were equipped with all necessary instruments for measurements, operation and control. Each system consists of a feed tank, a reactor (anaerobic digester), a gas storage tank, and a displaced water collecting tank. The digester start-up was achieved successfully and smoothly without any operational problems. The feed concentration had minor effects on the performance of the digester start-up while the operating temperature has approximately no effect.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Start Up Performance Of A Mesophilic Anaerobic Digester Without External Inoculums

Dohdoh

Aboulfotoh

2017

Environ. Protect. Eng.

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Deammonification for digester supernatant pretreated with thermal hydrolysis: overcoming inhibition through process optimization

Zhang

Clippeleir

et al. 2016

Appl Microbiol Biotechnol

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The thermal hydrolysis process (THP) has been proven to be an excellent pretreatment step for an anaerobic digester (AD), increasing biogas yield and decreasing sludge disposal. The goal of this work was to optimize deammonification for efficient nitrogen removal despite the inhibition effects caused by the organics present in the THP-AD sludge filtrate (digestate). Two sequencing batch reactors were studied treating conventional digestate and THP-AD digestate, respectively. Improved process control based on higher dissolved oxygen set-point (1 mg O2/L) and longer aeration times could achieve successful treatment of THP-AD digestate. This increased set-point could overcome the inhibition effect on aerobic ammonium-oxidizing bacteria (AerAOB), potentially caused by particulate and colloidal organics. Moreover, based on the mass balance, anoxic ammonium-oxidizing bacteria (AnAOB) contribution to the total nitrogen removal decreased from 97 ± 1 % for conventional to 72 ± 5 % for THP-AD digestate treatment, but remained stable by selective AnAOB retention using a vibrating screen. Overall, similar total nitrogen removal rates of 520 ± 28 mg N/L/day at a loading rate of 600 mg N/L/day were achieved in the THP-AD reactor compared to the conventional digestate treatment operating at low dissolved oxygen (DO) (0.38 ± 0.10 mg O2/L).

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Dynamic modeling of a full-scale anaerobic mesophilic digester start-up process for the treatment of primary sludge

Yang

Young

Munoz

et al. 2019

Journal of Environmental Chemical Engineering

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Startup of Anaerobic Mesophilic Digesters

Cited by 4 publications

References 0 publications

Start Up Performance Of A Mesophilic Anaerobic Digester Without External Inoculums

Start Up Performance Of A Mesophilic Anaerobic Digester Without External Inoculums

Deammonification for digester supernatant pretreated with thermal hydrolysis: overcoming inhibition through process optimization

Dynamic modeling of a full-scale anaerobic mesophilic digester start-up process for the treatment of primary sludge

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