The role of HRT and low temperature on the acid-phase anaerobic digestion of municipal and industrial wastewaters

Maharaj, I. C.; Elefsiniotis, P.

doi:10.1016/s0960-8524(00)00128-0

Cited by 86 publications

(80 citation statements)

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“…Maharaj and Elefsiniotis (2001) reported VSS reduction of 71.8, 72.9 and 74.6% during the anaerobic digestion of industrial and municipal wastewaters at HRT of 30, 48 and 60 h, The results also showed that the VSS reductions were significantly affected by the reaction temperature. Higher VSS reductions were obtained with the high diurnal temperature cycle.…”

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confidence: 81%

“…Higher VFA production was observed with lower diurnal cyclic temperature. Maharaj and Elefsiniotis (2001) noted increased VFA concentrations as the temperature was increased from 8-25°C, which then decreased upon further increase in temperature (from 25-35°C). Choorit and Wisarnwan (2007) Organic wastes are first converted to long chain fatty acids in the acidogenic stage of anaerobic digestion processes.…”

Section: Volatile Fatty Acidsmentioning

confidence: 91%

“…Colmenarejo et al (2004) reported that the highest VFAs production was achieved when the HRT was decreased from 5.2-1.7 h. Lew et al (2004) reported that the VFA concentration increased when the HRT was decreased from 24-3 h during the treatment of domestic wastewater. Elefkiniotis and Oldham (1994) reported an increase in VFA production when the HRT was increased from 6-12 h which then decreased with further increase in the HRT to 15 h. Maharaj and Elefsiniotis (2001) noted highest VFA concentration at an HRT of 30 h as appose to 48 and 60 h while an aerobically treating wastewaters. De la Rubia et al (2002) found that the VFA production increased from 5532-6432 mg L −1 as the HRT decreased from 75-20 days.…”

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confidence: 95%

“…Higher VSS reductions were obtained with the high diurnal temperature cycle. Maharaj and Elefsiniotis (2001) found that the VSS reduction increased from 50-74.6% during the anaerobic digestion of industrial and municipal wastewaters as the temperature was increased from 8-25°C. Al-Ghusain et al (2002) reported VSS concentrations of 4725 and 4549 mg L −1 during anaerobic sludge digestion at the temperatures of 30 and 40°C, respectively.…”

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confidence: 99%

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Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

Ghaly¹,

Hattab²

2011

American Journal of Biochemistry and Biotechnology

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Problem statement: Concentrated livestock production is a major contributor to environmental problems through the production of large quantity of husks on relatively small land area. Anaerobic digestion represents a valuable means of cover by these husks into methane while reducing manure pollution problems. Methodology: An experimental apparatus, including data acquisition and control system, was developed and used to investigate the effects of two diurnally cyclic temperature ranges (20-40 and 15-25°C) and four levels of hydraulic retention times (25, 20, 15 and 10 d) on the performance of anaerobic reactors operated on screened dairy manure. Results: The reactor temperature exhibited a lag relative to the chamber temperature. For the 20-40°C temperature cycles, the average lag at the maximum chamber temperature was 3.75 h while the lag at the minimum chamber temperature was 4.37 h. For the 15-25°C temperature cycle, the average lag at maximum chamber temperatures was 3.61 while the lag of the minimum chamber temperature was 4.34 h. The effluent solids content, total Kjeldahl nitrogen and ammonium nitrogen concentrations were not adversely affected by the reactor diurnally cyclic temperature. The observed values of these parameters compared fairly well with the values obtained by other researchers. The effluent total solids, volatile suspended solids, TKN, NH 4 -N and methane content of the biogas diurnally cyclic patterns were out of phase with the diurnally cyclic pattern of the reactor temperature by about 12 h under most of the investigated operating conditions. The pH and the carbon dioxide content of the biogas all exhibited a diurnally cyclic pattern which was in phase with the reactor diurnally cyclic temperature. The reductions in total solids, total suspended solids, fixed suspended solids, total Kjeldahl nitrogen, ammonium nitrogen and methane yield were all significantly affected by the diurnal temperature range and hydraulic retention time. Conclusion: The measured reactor pH followed a diurnally cyclic pattern which was in phase with the reactor temperature. At the operating temperature cycle of 20-40°C, the reactor pH ranged from 6.80-7.54 while VFA concentration ranged from 44.7-154.8 mg L .

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confidence: 81%

Section: Volatile Fatty Acidsmentioning

confidence: 91%

Section: ------------------------------------------------------------mentioning

confidence: 95%

Section: ------------------------------------------------------------mentioning

confidence: 99%

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Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

Ghaly¹,

Hattab²

2011

American Journal of Biochemistry and Biotechnology

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“…Increasing temperature improves PS hydrolysis and acidification [6,11,[15][16][17]. Zhang et al [18] observed the same results on activated sludge fermentation.…”

Section: Introductionmentioning

confidence: 64%

Optimización de la agitación de un digestor anaerobio mediante mecánica de fluidos computacional

Rubal¹

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Optimización de la agitación de un digestor anaerobio mediante mecánica de fluidos computacional Página | 5 AGRADECIMIENTOSEs posible que la parte más difícil de plasmar en papel de esta tesis doctoral sean los agradecimientos a todas las personas que han contribuido directa o indirectamente a que la tesis sea posible. Se me ocurren tantas personas y tantas cosas buenas que decir sobre ellas que sólo espero poder expresarlo como se merecen.Entre ellas, Guadalupe ocupa un lugar especial, por todo el apoyo recibido cuando más difícil parecía que iba a ser acabar la tesis, por sus ánimos, por escuchar todas mis historietas sobre campos de velocidades y fluidos no-newtonianos, porque siempre ha estado ahí, por tantas cosas,… Aunque él no se dé cuenta todavía, Pablo ha sido un gran apoyo y una gran motivación para realizar esta tesis doctoral. Me queda la duda de si dentro de unos años se acordará de las tardes que papá se quedaba en casa "estudiando" y de cómo quería quitarme el ordenador para ver a Peppa Pig.Quiero agradecerles a mis padres y a mi hermana todo el apoyo y el ánimo que me han dado a lo largo de estos años de Doctorado, su interés constante por saber que tal iban las cosas, su ayuda en cualquier momento,… Y a Martin, sin su trabajo, su ayuda y su implicación nunca hubiese sido posible realizar esta tesis.Sin duda, a Isabel y Juan Antonio, mis directores de tesis, quiero agradecerles su ayuda, sus enseñanzas, su paciencia, las ideas aportadas,… Tampoco me quiero olvidar de todos los profesores y personal del Departamento de Sanitaria, muchas gracias por vuestra ayuda y colaboración, especialmente a Julia, por hacer más divertidas y amenas todas las tardes que he pasado allí.Aunque él no quiere aparecer aquí, no sería justo no acordarse de José Antonio, quien me enseñó todo lo que sabía nada más conocernos y que siempre será "El Maestro". Como me dijo una vez, nos llevamos tan bien porque somos mucho más parecidos de lo que nos creemos.El último, pero no el menos importante es Gonzalo, un ejemplo a seguir en el mundo de la investigación y de la docencia, por todo lo que ha conseguido y por lo que conseguirá.Muchas gracias a todos los que me habéis ayudado. RESUMENDebido al gran interés existente en el ahorro y recuperación de energía, y en el deseo de obtener productos que permitan usos beneficiosos del fango procedente de la depuración del agua residual, la digestión anaerobia es el proceso de estabilización de uso más extendido. El tiempo de retención de sólidos es un factor clave en el proceso de digestión anaerobia. En base al tiempo de retención de sólidos, se dimensiona el volumen de los digestores anaerobios para así obtener la reducción de materia orgánica deseada, con la correspondiente producción de biogás. La geometría del digestor y su sistema de agitación deben ser adecuados para alcanzar el tiempo de retención de sólidos de diseño.Los primeros trabajos sobre la agitación de los digestores realizaban únicamente experimentos con trazadores y otros métodos de medición. En otros casos, la m...

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Pilot‐scale anaerobic thermophilic digester treating municipal sludge

et al. 2005

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The role of HRT and low temperature on the acid-phase anaerobic digestion of municipal and industrial wastewaters

Cited by 86 publications

References 14 publications

Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

Optimización de la agitación de un digestor anaerobio mediante mecánica de fluidos computacional

Pilot‐scale anaerobic thermophilic digester treating municipal sludge

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