Evaluation of different nutrient limitation strategies for the efficient production of poly(hydroxybutyrate-co-hydroxyvalerate) from waste frying oil and propionic acid in high cell density fermentations of H16.

Because of its application potential and biodegradability, poly(3-hydroxybutyrate-co-3-hydroxyvalerate;PHBV), a member of the polyhydroxyalkanoates (PHA) biopolymer family, is one of the most extensively studied PHA. High PHBV productivity with a significant amount of hydroxyvalerate (HV) content is very appealing for commercial scale production. The goal of this study was to investigate the efficiency of various defined limitation strategies, namely nitrogen, phosphorus, and oxygen-limitation, for high yield PHBV production by H16 with increased HV unit using waste frying vegetable oil (WFO) and propionic acid (PA) in a high cell density culture (5 L bioreactor).

Polyhydroxyalkanoate production using waste vegetable oil and filtered digestate liquor of chicken manure.

The production of polyhydroxyalkanoates (PHA) using digestate of chicken manure combined with waste sunflower oil as no-cost feedstocks in a multi-stage process was investigated. Using H16 in combined culture media, a maximum PHA accumulation of 4.6 ± 0.

Cyanophycin production from feather hydrolysate using biotechnological methods.

Cyanophycin is a bacterial storage polymer for carbon, nitrogen and energy with emerging industrial applications. As efficient cyanophycin production is enhanced by peptone, but commercial peptones are very expensive, thereby increasing the overall production cost, an enzymatically produced feather hydrolysate (FH) is assessed as a cheap replacement of peptone to lower the costs and make cyanophycin production more economically feasible. Keratinase production using feather as the sole carbon/nitrogen source by S.

Arsenic removal in a sulfidogenic fixed-bed column bioreactor.

In the present study, the bioremoval of arsenic from synthetic acidic wastewater containing arsenate (As(5+)) (0.5-20mg/L), ferrous iron (Fe(2+)) (100-200mg/L) and sulfate (2,000 mg/L) was investigated in an ethanol fed (780-1,560 mg/L chemical oxygen demand (COD)) anaerobic up-flow fixed bed column bioreactor at constant hydraulic retention time (HRT) of 9.6h.

Hexavalent chromium reduction in a sulfur reducing packed-bed bioreactor.

The most commonly used approach for the detoxification of hazardous industrial effluents and wastewaters containing Cr(VI) is its reduction to the much less toxic and immobile form of Cr(III). This study investigates the cleanup of Cr(VI) containing wastewaters using elemental sulfur as electron acceptor, for the production of hydrogen sulfide that induces Cr(VI) reduction. An elemental sulfur reducing packed-bed bioreactor was operated at 28-30°C for more than 250 days under varying influent Cr(VI) concentrations (5.