Selective optimization in thermophilic acidogenesis of cheese-whey wastewater to acetic and butyric acids: partial acidification and methanation

Yang, Kyeongcheol; Yu, Youngseob; Hwang, Seokhwan

doi:10.1016/s0043-1354(03)00006-x

Cited by 110 publications

(73 citation statements)

References 26 publications

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“…Despite that, higher energy consumption during the thermophilic phase should be taken into account from an economical point of view (84). During a set of experiments, a high-temperature-based technology including acetic and butyric acid fermentation followed by CH 4 production achieved 116 % COD reduction and 43 % CH 4 biosynthesis, thus performing bett er than single--phased processes (110).…”

Section: Biological Treatmentmentioning

confidence: 99%

Dairy Wastewaters – General Characteristics and Treatment Possibilities – A Review

Slavov

2017

Food Technol. Biotechnol.

189

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SummaryThe milk processing industry is one of the world's staple industries, thus the treatment possibilities of dairy effl uents have been att racting more and more att ention. The purpose of the paper is to review contemporary research on dairy wastewater. The origin, categories, as well as liquid by-products and general indicators of real dairy wastewater are described. Diff erent procedures applied for dairy wastewater management are summarised. Att ention is focused on in-factory treatment technologies with the emphasis on biological processes. Aerobic and anaerobic methods with both their advantages and disadvantages are discussed in detail. Consecutive anaerobic and aerobic systems are analysed, too. Finally, future research niches are identifi ed.

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Section: Biological Treatmentmentioning

confidence: 99%

Dairy Wastewaters – General Characteristics and Treatment Possibilities – A Review

Slavov

2017

Food Technol. Biotechnol.

189

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“…An additional seeding of 2.2 kg of anaerobic biomass was performed after cycle #11. Common strategies to limit biomass washout, besides adding sludge retention device mentioned above, include two stage treatment (Yang et al, 2003); or a fixed film to maintain the biomass inside the digester (Ratusznei et al, 2003). A different strategy was used in our study, with an extended settling of the effluent at the end of the cycle, with recuperated sludge return, allowing for a more stable quantity of reactive biomass maintained in the digester, as shown by the similar amount of sludge bed found at cycle #41 (4.4 kg VSS).…”

Section: Biomass Volumementioning

confidence: 99%

“…The use of lime, Ca(OH) 2 , is not suggested since it forms calcium precipitate in the biomass (El-Mamouni et al, 1995). The pH can be adjusted with bicarbonate (Cocci et al, 1991;Ratusznei et al, 2003) or NaOH (Yang et al, 2003). Long retention times (over 5 days) have also been used to minimize the acidification effect (Lo and Liao, 1986).…”

Section: Introductionmentioning

confidence: 99%

“…This has led to different strategies to minimize the acidification of the wastewater under treatment and the biomass washout, such as the use of a single digester with suspended or fixed biomass (Kalyuzhnyi et al, 1997;Ratusznei et al, 2003;Rodgers et al, 2004). Two-phase anaerobic processes, where the acidogenic and methanogenic digestion are conducted in two separate digesters were also investigated (Yilmazer and Yenigün, 1999;Yang et al, 2003;Saddoud et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

Frigon

Bretón

Bruneau

et al. 2009

Bioresource Technology

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The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale Frigon, J.-C.; Breton, J.; Bruneau, T.; Moletta, R.; Guiot, S. R. The treatment of reconstituted whey wastewater was performed in a 400 L digester at 20°C, with an anaerobic digestion step, followed by a step of aerobic treatment at low oxygen concentration in the same digester. In a first set of 48 cycles, total cycle time (T C ) of 2, 3 and 4 days were tested at varying organic loading rates (OLR). The COD removal reached 89 ± 4, 97 ± 3 and 98 ± 2% at T C of 2, 3 and 4 days and OLR of 0.56, 1.04 and 0.78 gCOD L À1 d À1 , respectively. The activity of the biomass decreased for the methanogenic population, while increasing by 400% for the acidogens, demonstrating a displacement in the predominant trophic group in the biomass bed. A second set of 16 cycles was performed with higher soluble oxygen concentration in the bulk liquid (0.5 mg L À1 ) during the aerobic treatment at a T C of 2 days and an OLR of 1.55 gCOD L À1 d À1 , with a soluble COD removal of 88 ± 3%. The biomass specific activities showed a compartmentalization of the trophic group with methanogenic activity maintained in the biomass bed and a high acidogenic activity in the suspended flocs.Crown

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“…Previous studies have been carried out exhibiting cheese processing wastewaters and cheese whey treatment with different types of reactors such as PABR [5], UASB [6,7], CSTR [8,9], anaerobic membrane reactor [10] etc.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Biogas Production by Using a Two-Stage Process for the Anaerobic Digestion of Cheese Whey

et al. 2017

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Cheese making companies have a specific product that is seasonally produced and, like most other agro-industries, generate wastewaters characterized by a high organic loading. Cheese whey is the most important waste stream produced having a high organic content (up to 70 g COD/L), which is highly biodegradable, and low alkalinity (50 meq/L). Cheese production industries worldwide generate more than 145 million tones of liquid whey per year. Because of these characteristics, cheese whey may cause serious environmental problems on the local municipal sewage treatment systems or water receptors if disposed untreated. Anaerobic digestion is a particularly attractive treatment solution for high strength wastewaters due to the operational economy and generation of biogas and therefore is considered as a promising solution for energy production from cheese whey, in this case. In this work, a comparative study between single and two-stage anaerobic treatment of cheese whey was conducted in order to enhance biogas production. Our experiments were carried out using one reactor for the single-stage process (operated at a HRT of 20 d), and two reactors connected in series, from which the first one was used for acidogenesis (operated at a HRT of 3 d) and the other for methanogenesis (operated at a HRT of 20 d). The single-stage process presented many operational problems, as a result of little or no buffering capacity of whey, which caused the pH of the anaerobic digester to drop drastically and the process being inhibited. This kind of inhibition proved to be irreversible and the digester was not able to recover even though it was operated batchwise and the value of the pH was restored to 7.0. On the contrary, the two-stage process exhibited a stable biogas production rate of 1.57 L/L reactor /d with the composition of methane in the biogas reaching 54.3%. The dissolved COD and total carbon concentration removal was 70.5% and 77.2% respectively.

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Selective optimization in thermophilic acidogenesis of cheese-whey wastewater to acetic and butyric acids: partial acidification and methanation

Cited by 110 publications

References 26 publications

Dairy Wastewaters – General Characteristics and Treatment Possibilities – A Review

Dairy Wastewaters – General Characteristics and Treatment Possibilities – A Review

The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

Enhancement of Biogas Production by Using a Two-Stage Process for the Anaerobic Digestion of Cheese Whey

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