Optimal production of polyhydroxyalkanoates (PHA) in activated sludge fed by volatile fatty acids (VFAs) generated from alkaline excess sludge fermentation

Cai, Meifeng; Chua, H.; Zhao, Qingliang; Shirley, Sin Ngai; Ren, Jie

doi:10.1016/j.biortech.2008.09.014

Cited by 189 publications

(55 citation statements)

References 33 publications

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“…The maximum PHA content obtained, 37% of TSS, is higher than has been obtained with a tomato cannery wastewater, 20% of cell weight (Liu et al, 2008), but lower than what has been obtained using a fermented paper mill effluent (Bengtsson et al, 2008b) and fermented waste sludge (Coats et al, 2007;Mengmeng et al, 2009), 48% and 53-56.5% P(3HB-3HV) of TSS, respectively. It is significantly lower than what has been obtained using GAOs and synthetic acetate as substrates, namely 60% P(3HB) of cell dry weight (Bengtsson, 2009).…”

Section: Comparisons With Other Enrichment Strategiescontrasting

confidence: 69%

“…Production of PHA has also been demonstrated from food waste (Rhu et al, 2003), tomato cannery wastewater (Liu et al, 2008), municipal wastewater (Chua et al, 2003) and from municipal waste sludge (Coats et al, 2007;Mengmeng et al, 2009). As noted by Albuquerque et al (2007), operating conditions for optimum PHA production can be different when using real fermented waste streams rather than synthetic substrates.…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Production of polyhydroxyalkanoates from fermented sugar cane molasses by a mixed culture enriched in glycogen accumulating organisms

Bengtsson¹,

Pisco

Reis

et al. 2010

Journal of Biotechnology

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Section: Comparisons With Other Enrichment Strategiescontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 96%

Production of polyhydroxyalkanoates from fermented sugar cane molasses by a mixed culture enriched in glycogen accumulating organisms

Bengtsson¹,

Pisco

Reis

et al. 2010

Journal of Biotechnology

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“…The addition of wollastonite during fermentation was beneficial for filterability as the flux increased from 9.5 to 12.5 L/m 2 h. When fermentation liquid was applied to wastewater, the nutrient removal kinetics were improved compared to the use of acetic acid alone. Mengmeng et al (2009) …”

Section: Resultsmentioning

confidence: 97%

Recovery of volatile fatty acids from fermentation of sewage sludge in municipal wastewater treatment plants

Longo

Katsou

Malamis

et al. 2015

Bioresource Technology

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“…Chua et al [18] studied the effect of acetate concentration in influent, pH and sludge retention time (SRT) on the production of PHA S by activated sludge treating municipal wastewater. Fermentative volatile fatty acids (VFAs) as carbon sources to synthesize PHA S by activated sludge were examined by Cai et al [19]. In another study, it was found that activated sludge from a pulp and paper industry wastewater treatment plant had the best potential for PHA S production among activated sludge from municipal, industrial starch, and industrial dairy wastewater treatment plants, in laboratory scale experiments [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of process variables on the production of Polyhydroxyalkanoates by activated sludge

Mokhtarani

Ganjidoust

Vasheghani‐Farahani

2012

J Environ Health Sci Engineer

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Polyhydroxyalkanoates are known to be temporarily stored by microorganisms in activated sludge, especially in anaerobic-aerobic processes. Due to the problems resulted from the disposals of plastic wastes and excess sludge of wastewater treatment plants, the production of polyhydroxyalkanoates by treating activated sludge and determining the effect of process variables were the main issues of this paper. In this research, an anaerobic-aerobic sequencing batch reactor was used to make microorganism adapted and a batch aerobic reactor was used for enriching them. The variables affecting polyhydroxyalkanoates production including aeration time, sludge retention time, and volatile fatty acids concentration of the influent in sequencing batch reactor, and also carbon to nitrogen ratio and cultivation time in polymer production reactor, were investigated using Taguchi statistical approach to determine optimum conditions. The maximum polymer production of 29% was achieved at sludge retention time of 5–10 days, aeration time of 2 hours, supplementation of 40% of volatile fatty acids in the influent and increasing of carbon to nitrogen ratio of polymer production reactor to above 25 g/g. Based on the results, in optimum conditions, the volatile fatty acids concentration which increased the production of polyhydroxyalkanoates up to 49% was the most effective variable. Carbon to nitrogen ratio, sludge retention time and aeration time were ranked as the next affecting parameters. Although the polyhydroxyalkanoates content achieved in present study is much lower than that by pure culture, but the proposed method may still serve well as an environmental friendly means to convert waste into valuable product.

show abstract

Optimal production of polyhydroxyalkanoates (PHA) in activated sludge fed by volatile fatty acids (VFAs) generated from alkaline excess sludge fermentation

Cited by 189 publications

References 33 publications

Production of polyhydroxyalkanoates from fermented sugar cane molasses by a mixed culture enriched in glycogen accumulating organisms

Production of polyhydroxyalkanoates from fermented sugar cane molasses by a mixed culture enriched in glycogen accumulating organisms

Recovery of volatile fatty acids from fermentation of sewage sludge in municipal wastewater treatment plants

Effect of process variables on the production of Polyhydroxyalkanoates by activated sludge

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