VFA Production in Pre-Acidification Systems without pH Control

Kozuchowska, Joanna; Evison, Lilian M.

doi:10.1080/09593331608616306

Cited by 10 publications

(6 citation statements)

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“…Considering the total range of temperature of 10-24°C and the short HRT, the SCVFA production appears significant. Kozuchowska and Evinson (1995) reported a maximum of 358 mg/L SCVFA production at 45°C at 1-3 h HRT in a laboratory-scale batch fermenter, confirming the trends in this study.…”

Section: Prefermentation Of Raw Wastewatersupporting

confidence: 89%

Assessment of short-HRT, on-line, fixed-film prefermentation of domestic wastewater for enhanced biological phosphorus removal

Mavinic¹,

Mahendraker²,

Rabinowitz³

et al. 2001

Can. J. Civ. Eng.

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In this work, pilot-scale, on-line, short-HRT fixed-film prefermenter systems were evaluated using Ringlace and Kaldnes fixed-film media for short chain volatile fatty acid (SCVFA) production, with screened raw domestic wastewater and primary effluent. In comparison to the control reactors without media, significant levels of SCVFA were generated in the fixed-film prefermenters. For the design considered in this study, the Ringlace media performed well, whereas the Kaldnes media resulted in clogging. The Ringlace media data show that, for a 60-min HRT, on-line prefermenter systems produced 11 and 5.5 mg/L of SCVFA (as acetic acid) with screened raw wastewater and primary effluent, respectively. Such a low HRT might translate into potential cost savings (up to 25%) in providing SCVFA to enhanced biological phosphorus removal (EBPR) plants and could lead to a completely new generation of prefermenter designs.Key words: domestic sewage, enhanced biological phosphorus removal systems, fixed film, prefermenter, short chain volatile fatty acids. Mavinic et al.Résumé : Dans ce travail, des systèmes en série à l'échelle pilote de préfermentation à film fixe et à temps de rétention hydraulique court ont été évalués, en utilisant des médias à film fixe Ringlace et Kaldnes pour la production d'acide volatile gras à chaîne courte, avec des eaux usées domestiques tamisées et de l'effluent primaire. En comparaison avec les réacteurs de contrôle sans média, des niveaux significatifs d'acides volatiles gras à chaîne courte ont été générés dans le préfermenteur à film fixe. Pour la conception considérée dans cette étude, le média Ringlace a bien performé, tandis que le média Kaldnes s'est encrassé. Les données du média Ringlace ont montré que, pour un temps de rétention hydraulique de 60 min, les systèmes de préfermentation en série ont produit 11 et 5,5 mg/L d'acide volatile gras à chaîne courte (sous forme d'acide acétique) avec les eaux usées domestiques tamisées et l'effluent primaire, respectivement. Un temps de rétention hydraulique si bas peut se traduire en des économies de coûts potentielles (jusqu'à 25%) en ajoutant des acides volatiles gras à chaîne courte aux systèmes d'enlèvement au phosphore biologique améliorés, et pourrait mener à une nouvelle génération de conceptions de préfermenteurs.Mots clés : eaux usées domestiques, systèmes d'enlèvement au phosphore biologique améliorés, film fixe, préfermenteur, acides volatiles gras à chaîne courte.[Traduit par la Rédaction] 626

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Section: Prefermentation Of Raw Wastewatersupporting

confidence: 89%

Assessment of short-HRT, on-line, fixed-film prefermentation of domestic wastewater for enhanced biological phosphorus removal

Mavinic¹,

Mahendraker²,

Rabinowitz³

et al. 2001

Can. J. Civ. Eng.

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“…Nanyang Technological University Library particular biomass and wastewater composition (Banerjee et al 1998). However, other studies showed 45°C was the optimum temperature for pre-acidification of coffee waste with acetic acid and n-butyric acid production (Kozuchowska and Evison 1995). Rapid temperature drops also affected starch degradation significantly at a temperature level between 15°C and 30°C (Cha and Noike 1997).…”

Section: Temperaturementioning

confidence: 88%

Effects of microbial community, lipids and pretreatment on the performance of the two-phase anaerobic digestion

Liu¹

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“…Chunky began in this range, while Skinny began below it, suggesting a high level of acid already present. This was likely due its higher content of coffee grounds (Kozuchowska & Evison, 1995), though present in both digesters. While acidification was likely hampered due to the low temperatures, the net reduction in pH suggests acids were being produced.…”

Section: Digester Optimization and Controlmentioning

confidence: 96%

Small-scale Minimal-maintenance Anaerobic Digestion of Food Waste for Solids Reduction and Methane Production: Feasibility Study

Scantlebury¹

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, and the PSU Environmental Club. Hopefully someday the orchard will sprout a food waste digester.Lastly, I'd like to thank my research partner Emily Heleva-Ponaski for working countless hours with me on this project through rough days, terrible smells, and even a broken windshield.It wouldn't have been funny without you around. 2 ABSTRACTSix gallons of food waste was anaerobically digested for 76 days in two small-scale digesters sitting by a lab window. The main difference, besides waste sources, of these digesters was substrate processing: chopping versus blending. An effort was made to minimize the maintenance of the digesters, however, after 45 days of overly acidic (pH<5) conditions sodium carbonate was added to raise the pH. Both digesters were subsequently seeded with digested sludge from a local wastewater treatment plant, and which time methane production greatly increased. However, by the end of the experiment, total solids reduction, volatile solids reduction, and methane production was greatly lower than values from similar studies. The most likely issue identified was lack of temperature control (too cold) as well as low pH. While the digesters were far from optimized, they did reduce solids, produce methane, and identify ways to avoid similar issues for projects in the future.3

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VFA Production in Pre-Acidification Systems without pH Control

Cited by 10 publications

References 0 publications

Assessment of short-HRT, on-line, fixed-film prefermentation of domestic wastewater for enhanced biological phosphorus removal

Assessment of short-HRT, on-line, fixed-film prefermentation of domestic wastewater for enhanced biological phosphorus removal

Effects of microbial community, lipids and pretreatment on the performance of the two-phase anaerobic digestion

Small-scale Minimal-maintenance Anaerobic Digestion of Food Waste for Solids Reduction and Methane Production: Feasibility Study

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