Production of polyhydroxyalkanoates (PHA) by activated sludge treating municipal wastewater: effect of pH, sludge retention time (SRT), and acetate concentration in influent

Chua, Adeline Seak May; Takabatake, Hiroo; Satoh, Hiroyasu; Mino, Takashi

doi:10.1016/s0043-1354(03)00252-5

Cited by 226 publications

(152 citation statements)

References 23 publications

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“…Previous researches have reported the use of various industrial wastes such as activated sludge, dairy waste, cheese whey, molasses and so on. In a research done by Chua et al [8], it was shown that PHA accumulation was higher with slight alteration of the sludge by adding acetate into the municipal wastewater to give a PHA yield of up to 30% of the sludge's dry weight. Studies done by Rogers and Wu [9] suggested the use of enhanced biological phosphorus removal (EBPR) in activated sludge to give a yield of 50% PHA content under aerobic and anaerobic condition Cheese whey is another type of solid waste that can be used for PHA synthesis.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis on Cell Growth and Biosynthesis of Poly (3-Hydroxybutyrate) (PHB) in Cupriavidus Necator H16

Khan¹,

Prasad²,

Abdullah³

et al. 2013

IJBBB

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Section: Introductionmentioning

confidence: 99%

Kinetic Analysis on Cell Growth and Biosynthesis of Poly (3-Hydroxybutyrate) (PHB) in Cupriavidus Necator H16

Khan¹,

Prasad²,

Abdullah³

et al. 2013

IJBBB

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“…Cheung and Anderson (1997) tried to produce ethanol from the cellulose content of primary sludge of WWTPs, via simultaneous saccharification and fermentation (SSF). Additionally, using chemical and physical processes, researchers have tried to produce products such as bioplastics (Chua et al 2003), biofertilizers (Ben Rebah et al 2007), and biodiesel (Siddiquee and Rohani 2011) from WAS.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic digested sludge: a new supplementary nutrient source for ethanol production

Bashiri

Farhadian

Asadollahi

et al. 2016

Int. J. Environ. Sci. Technol.

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Effluent sludge from an anaerobic digester was used as a source of nitrogen, phosphate, sulfur, and other nutrients in the culture medium of ethanol production by the yeast Saccharomyces cerevisiae. Several pretreatments (mechanical, chemical, thermal, and thermo-chemical) were performed on the anaerobic digested sludge (ADS) to make the nutrients accessible to the yeast cells. Preliminary experiments revealed that S. cerevisiae is not able to assimilate the carbon content of the ADS. However, when glucose was added to the medium, ethanol production was observed. The yield of ethanol using untreated ADS was only 10 % of the theoretical yield, but alkaline pretreatment improved it up to 43 %. By separating the hydrolysate of alkaline-treated ADS from the suspended solids, the ethanol yield from the supernatant was further improved up to 65 % of theoretical yield. Alkaline-treated ADS exhibited competitive performance with the mixture of yeast extract and mineral salts in ethanol fermentation.

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“…Sewage sludge is rich in organic carbon, and so it may be utilized as a cheap but valuable resource for the production of volatile fatty acids (VFAs). It is widely applied as a means to convert organic waste into substrates for many bioprocesses of nutrient removal of wastewater (Bougrier et al, 2007(Bougrier et al, , 2008; Kampas et al, 2007) and biopolymer production (Chua et al, 2003). It has also been used to increase methane production by increasing digestion efficiency in an anaerobic digestion tank (Bougrier et al, 2006;Keymer et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction

Song

Park

Han

et al. 2014

Journal of the Air & Waste Management Association

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The purpose of this study is to quantify the thermal conductivity of sewage sludge related to reaction temperature for the optimal design of a thermal hydrolysis reactor. We continuously quantified the thermal conductivity of dewatered sludge related to the reaction temperature. As the reaction temperature increased, the dewatered sludge is thermally liquefied under high temperature and pressure by the thermal hydrolysis reaction. Therefore, the bound water in the sludge cells comes out as free water, which changes the dewatered sludge from a solid phase to slurry in a liquid phase. As a result, the thermal conductivity of the sludge was more than 2.64 times lower than that of the water at 20 . However, above 200 , it became 0.704 W/m C, which is about 4% higher than that of water. As a result, the change in physical properties due to thermal hydrolysis appears to be an important factor for heat transfer efficiency.Implications: The thermal conductivity of dewatered sludge is an important factor the optimal design of a thermal hydrolysis reactor. The dewatered sludge is thermally liquefied under high temperature and pressure by the thermal hydrolysis reaction. The liquid phase slurry has a higher thermal conductivity than pure water.

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Production of polyhydroxyalkanoates (PHA) by activated sludge treating municipal wastewater: effect of pH, sludge retention time (SRT), and acetate concentration in influent

Cited by 226 publications

References 23 publications

Kinetic Analysis on Cell Growth and Biosynthesis of Poly (3-Hydroxybutyrate) (PHB) in Cupriavidus Necator H16

Kinetic Analysis on Cell Growth and Biosynthesis of Poly (3-Hydroxybutyrate) (PHB) in Cupriavidus Necator H16

Anaerobic digested sludge: a new supplementary nutrient source for ethanol production

Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction

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