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http://dx.doi.org/10.7845/kjm.2017.7055

Biosynthesis of polyhydroxyalkanoate by mixed microbial cultures from hydrolysate of waste activated sludge  

Park, Taejun (Department of Microbiology and Molecular Biology, Chungnam National University)
Yoo, Young Jae (Department of Microbiology and Molecular Biology, Chungnam National University)
Jung, Dong Hoon (Department of Microbiology and Molecular Biology, Chungnam National University)
Lee, Sun Hee (Department of Microbiology and Molecular Biology, Chungnam National University)
Rhee, Young Ha (Department of Microbiology and Molecular Biology, Chungnam National University)
Publication Information
Korean Journal of Microbiology / v.53, no.3, 2017 , pp. 200-207 More about this Journal
Abstract
A new approach to the solubilization of waste activated sludge (WAS) using alginate-quaternary ammonium complex beads was investigated under controlled mild alkaline conditions. The complex beads were prepared by the reaction of sodium alginate (SA) with 3-(trimethoxysilyl)propyl-octadecyldimethylammonium chloride (TSA) in acid solution, followed by crosslinking with $CaCl_2$. Treatment of WAS with SA-TSA complex beads was effective for enhancing the efficacy of WAS solubilization. The highest value of soluble chemical oxygen demand (SCOD) concentration (3,900 mg/L) was achieved after 10 days of treatment with 30% (v/v) SA-TSA complex beads. The WAS solubilization efficacy of the complex beads was also evaluated by estimating the concentrations of volatile fatty acids (VFAs). The maximum value of VFAs was 2,961 mg/L, and the overall proportions of VFAs were more than 75% of SCOD. The main components of VFAs were acetic, propionic, iso-butyric, and butyric acids. These results suggest that SA-TSA complex beads might be useful for enhancing the solubilization of WAS. The potential use of VFAs as the external carbon substrate for the production of polyhydroxyalkanoate (PHA) by a mixed microbial culture (MMC) was also examined. The enrichment of PHA-accumulating MMC could be achieved by periodic feeding of VFAs generated from WAS in a sequencing batch reactor. The composition of PHA synthesized from VFAs mainly consisted of 3-hydroxybutyrate. The maximum PHA content accounted for 25.9% of dry cell weight. PHA production by this process is considered to be promising since it has a doubly beneficial effect on the environment by reducing the amount of WAS and concomitantly producing an eco-friendly biopolymer.
Keywords
alginate-quaternary ammonium complex beads; mixed microbial culture; polyhydroxyalkanoates; waste activated sludge;
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