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activated sludge polyhydroxyalkanoates

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Comprehensive utilization of activated sludge for the ...

ABSTRACTThe urban wastewater treatment industry produces a large amount of excess activated sludge which is mainly composed of microbial biomass and costly to be disposed. In this research, a comprehensive utilization of activated sludge was developed by sequentially extracting hydrolytic enzymes and polyhydroxyalkanoates (PHAs), and the residue was used to prepare water-retaining .

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Polyhydroxyalkanoates Production by Activated Sludge ...

Abstract: Polyhydroxyalkanoates have attracted much interest as an alternative to traditional plastics since they are biodegradable and biocompatible. In this paper, activated sludge used for PHA production was selected and effects of pH and initial Sludge PHA .

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Change in metabolism of PHA accumulation by activated ...

Change in metabolism of PHA accumulation by activated sludge modifying operating conditions. L. S. Serafim, P. C. Lemos, M. A. M. Reis. DQ - Departamento de Química; ... The change in operational conditions allowed the population to modify the metabolism of phosphorus and polyhydroxyalkanoates (PHA) accumulation. Under aerobic dynamic feeding ...

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Efficient Polyhydroxyalkanoates Production from a Waste ...

It was reported in our previous publication that the accumulation of short-chain fatty acids (SCFA) was significantly enhanced when waste-activated sludge (WAS) was anaerobically fermented at pH 10.0 (Yuan, et al., Environ. Sci. Technol. 2006, 40, 2025−2029). In this paper, the production of polyhydroxyalkanoate (PHA) by activated sludge with an aerobic feeding and discharge (AFD) .

  • Published in: Environmental Science & Technology · 2009Authors: Yamin Jiang · Yinguang Chen · Xiong ZhengAbout: Anaerobic digestion · Waste treatment · Fermentation · Polyhydroxyalkanoates · Ph.Get Price

Polyhydroxyalkanoates Research Papers - Academia.edu

In this study, changes in microbial diversity and polyhydroxyalkanoate storage ability of activated sludge under aerobic dynamic feeding conditions were investigated. Two sequencing batch reactors were operated with and without nitrogen limitation, by applying a moderate sludge retention time.

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Polyhydroxybutyrate Production from Municipal Wastewater ...

In this study, a sequencing batch reactor was set up and operated for over three months to cultivate polyphosphate-accumulating organisms polyphosphate-accumulating organisms (PAOs) in the enriched activated sludge. Batch studies were then carried out to study the effect of different carbon sources on phosphorus removal as well as polyhydroxybutyrate (PHB) production.

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Biotechnological Production of Polyhydroxyalkanoates: A ...

Polyhydroxyalkanoates (PHA) producers have been reported to reside at various ecological niches which are naturally or accidently exposed to high organic matter or growth limited conditions such as dairy wastes, hydrocarbon contaminated sites, pulp and paper mill wastes, agricultural wastes, activated sludges of treatment plants, rhizosphere, and industrial effluents.

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Polyhydroxyalkanoate (PHA) accumulation potential and PHA ...

Results indicated that (i) activated sludge in municipal WWTPs can accumulate up to approx. 20 wt% of PHA without enrichment processes, (ii) PHA accumulation potential of activated sludge varied depending on the operational conditions (treatment processes) of WWTPs, and (iii) phaC gene number can provide a simple indication of PHA accumulation ...

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Production and degradation of polyhydroxyalkanoates in ...

Polyhydroxyalkanoates (PHAs) represent an environmentally-effective alternative to synthetic thermoplastics; however, current production practices are not sustainable. In this study, PHA production was accomplished in sequencing batch bioreactors utilizing real wastewaters and mixed microbial consortia from municipal activated sludge as inoculum.

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Influence of cultivation time on the production of ...

4 Marzie Fatehi and Seyed Ahmad Ataei: Influence of Cultivation Time on the Production of Polyhydroxyalkanoates by Activated Sludge determinate. BOD of activated sludge before and after adding sodium acetate as excess carbon source are given in Table 2. Table 2. Biochemical oxygen demand of activated sludge before and after adding sodium acetate.

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Production of polyhydroxyalkanoates (PHA) by activated ...

Sep 01, 2003 · Read "Production of polyhydroxyalkanoates (PHA) by activated sludge treating municipal wastewater: effect of pH, sludge retention time (SRT), and acetate concentration in influent, Water Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: Water Research · 2003Authors: Adeline Seak May Chua · Hiroo Takabatake · Hiroyasu Satoh · Takashi MinoAffiliation: University of Tokyo · Tohoku UniversityAbout: Dry weight · Residue · Sequencing batch reactor · Valorisation · Biodegradation · Was.[PDF]Get Price

RESEARCH ARTICLE Open Access Effect of process variables ...

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

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The Utilization of Activated Sludge Polyhydroxyalkanoates ...

The Utilization of Activated Sludge Polyhydroxyalkanoates for the Production of Biodegradable Plastics Warangkana Punrattanasin (ABSTRACT) Sequencing batch reactor (SBR) systems were used for the development of a system and operating procedures for the high production and internal storage of polyhydroxyalkanoates

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Biodegradable polymers from organic acids by using ...

Wee Shen Lee, Adeline Seak May Chua, Hak Koon Yeoh, Tadashi Nittami and Gek Cheng Ngoh, Strategy for the biotransformation of fermented palm oil mill effluent into biodegradable polyhydroxyalkanoates by activated sludge, Chemical Engineering Journal, 269, (288), (2015).

  • Published in: Biotechnology and Bioengineering · 2004Authors: Davide Dionisi · Mauro Majone · Viviana Papa · M BeccariAbout: Organic acid · Aerobie · Polyhydroxyalkanoates · Sequencing batch reactor · Activate.Get Price

Polyhydroxyalkanoates Production by Activated Sludge ...

Abstract: Polyhydroxyalkanoates have attracted much interest as an alternative to traditional plastics since they are biodegradable and biocompatible. In this paper, activated sludge used for PHA production was selected and effects of pH and initial Sludge PHA .

    Author: Yamin Jiang, Xiaoming Hou, Yuanlong ZhangGet Price

Biodegradable polymers from organic acids by using ...

Wee Shen Lee, Adeline Seak May Chua, Hak Koon Yeoh, Tadashi Nittami and Gek Cheng Ngoh, Strategy for the biotransformation of fermented palm oil mill effluent into biodegradable polyhydroxyalkanoates by activated sludge, Chemical Engineering Journal, 269, (288), (2015).

  • Published in: Biotechnology and Bioengineering · 2004Authors: Davide Dionisi · Mauro Majone · Viviana Papa · M BeccariAbout: Organic acid · Aerobie · Polyhydroxyalkanoates · Sequencing batch reactor · Activate.Get Price

Effect of process variables on the production of ...

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...

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Polyhydroxyalkanoates in waste activated sludge enhances ...

Jan 21, 2016 · Activated sludge processes produce plenty of waste activated sludge (WAS), the treatment and disposal of which require substantial costs .

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The Influence of Different Carbon Sources for ...

The influence of different carbon sources such as glucose, sodium acetate, sodium propionate and ethanol for polyhydroxyalkanoates (PHA) storage were studied in details. It was shown that both the cell content and composition of PHA synthesized by microorganisms in activated sludge were different when different carbon sources were used. PHB (polyhydroxybutyrate) was the main PHA if sodium ...

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Optimal production of polyhydroxyalkanoates (PHA) in ...

Feb 01, 2009 · Read "Optimal production of polyhydroxyalkanoates (PHA) in activated sludge fed by volatile fatty acids (VFAs) generated from alkaline excess sludge fermentation, Bioresource Technology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: Bioresource Technology · 2009Authors: Cai Mengmeng · Chua Hong · Zhao Qingliang · Sin Ngai Shirley · Ren JieAffiliation: Harbin Institute of Technology · Hong Kong Polytechnic UniversityAbout: Carbon · Acetic acid · Sewage treatment · Activated sludge · Wastewater · FermentationGet Price

Comprehensive utilization of activated sludge for the ...

In this research, a comprehensive utilization of activated sludge was developed by sequentially extracting hydrolytic enzymes and polyhydroxyalkanoates (PHAs), and the residue was used to prepare water-retaining organic fertilizer. The sludge was extracted with fourfold H2O-containing 1% Triton X-100 with the yield of 66.7% protease activity.

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