Mesophilic and thermophilic anaerobic digestion of primary and secondary sludge. Effect of pre-treatment at elevated temperature

Gavala, Hariklia N.; Yenal, Umur; Skiadas, Ioannis V.; Westermann, Peter; Ahring, Birgitte Kiær

doi:10.1016/s0043-1354(03)00401-9

Cited by 351 publications

(155 citation statements)

References 21 publications

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“…However, the total amount of biogas produced is limited to how 235 much material is in the digester. Therefore, the effects of temperature become increasingly 236 less significant at higher retention times (Gavala, et al, 2003) (Seadi, et al, 2008). It is 237 incorporated as shown in and to reflect these characteristics.…”

Section: Inclusion Of Temperature Effects 225mentioning

confidence: 99%

A spreadsheet calculator for estimating biogas production and economic measures for UK-based farm-fed anaerobic digesters

Lovett

McEwan

et al. 2016

Bioresource Technology

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Section: Inclusion Of Temperature Effects 225mentioning

confidence: 99%

A spreadsheet calculator for estimating biogas production and economic measures for UK-based farm-fed anaerobic digesters

Lovett

McEwan

et al. 2016

Bioresource Technology

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“…The most common treatment temperatures are between 60 and 180°C. Treatments applied at temperatures below 100°C are considered as low temperature thermal treatments (Gavala et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater

Uan

Yeom

Arulazhagan

et al. 2012

Int. J. Environ. Sci. Technol.

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Excess sludge disposal is one of the serious challenges in biological wastewater treatment. Reduction of sludge production would be an ideal way to solve sludgeassociated problems rather than the post-treatment of the sludge produced. In this study, a new wastewater treatment process combining anaerobic/anoxic/oxic system with thermochemical sludge pretreatment was tested in a laboratory scale experiment. In this study, the effects of the sludge pretreatment on the excess sludge production in anaerobic/anoxic/oxic were investigated. The system was operated in two Runs (1 and 2). In Run 1, the system was operated as a reference and in Run 2, a part of the mixed liquid was pretreated thermochemically and was returned to the bioreactor. The average solubilization efficiency of pretreated sludge was found to be about 35 % during the study period of 220 days. Sludge production rate in Run 2 was less than that in Run 1 by about 52 %. Total phosphorous was removed by enhanced biological phosphorous removal with the removal efficiency of 83-87 % and 81-83 % for Run 1 and Run 2, respectively. Total nitrogen removal in Run 2 (79-82 %) was slightly higher than that in Run 1 (68-75 %). The mixed liquor suspended solids/ mixed liquor volatile suspended solids ratio was identical after both runs in the range 78-83 %. The effluent water qualities were not significantly affected when operated with thermochemical pretreatment at pH 11 and 60°C for 3 h during 7 months. From the present study it is concluded that thermochemical sludge pretreatment of anaerobic/anoxic/ oxic process plays an important role in reduction of sludge production.

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“…The rate limiting step of sludge degradation is hydrolysis, during which both solubilization of particulate matter and biological degradation of organic components can occur. Thermal, chemical, biological and mechanical processes and their different combinations have been studied as possible modes of pretreatment accelerating sludge hydrolysis (Gavala et al, 2003;Kim et al, 2003). These pretreatments cause the lysis or degradation of sludge cells, the organic matter therefore becoming more accessible to anaerobic microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

Beszédes

Kertész

László

et al. 2009

Ozone: Science & Engineering

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The production of canned maize is accompanied by formation of large volumes of waste water, with high contents of starch, and high chemical-and biochemical oxygen demand. In our work the effects of acidic, microwave and ozone pretreatment on the biogas production and aerobic biodegradability of canned maize production sludge were examined and the energy balance of the processes were determined when different sludge pretreatments were used. It was found that ozone treatment decreased the chemical oxygen demand, while the biochemical oxygen demand and the aerobic biodegradability increased. The combination of microwave and ozone treatment increased the biodegradability relative to ozone treatment alone.

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Mesophilic and thermophilic anaerobic digestion of primary and secondary sludge. Effect of pre-treatment at elevated temperature

Cited by 351 publications

References 21 publications

A spreadsheet calculator for estimating biogas production and economic measures for UK-based farm-fed anaerobic digesters

A spreadsheet calculator for estimating biogas production and economic measures for UK-based farm-fed anaerobic digesters

Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater

Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

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