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Accumulation of polyhydroxyalkanoates (PHAs) in activated sludge under nitrogen limitation conditions. Part I. Effect of operational condition on effectiveness of poly(3-hydroxybutyric acid) (P(3HB)) accumulation

100%

Pokoj T. , Klimiuk E. , Kuczajowska-Zadrozna M.

nr 4

197-213

The accumulation of poly(3-hydroxybutyric acid) in activated sludge was investigated. Fed-batch culture was carried out using sodium acetate as the source of carbon. A lack of nitrogen was a stimulating factor of accumulation P(3HB). Two experimental series were run. In series 1, nitrogen was fed into abacterial culture once for the first 24 hours, in series 2 ? for 6 hours each day of the experiment. The effect of operational conditions was evaluated based on the accumulation of P(3HB) in biomass, specific growth rate of microorganisms (m) yield coefficients (YP(3HB)/C, YP(3HB)/X), and productivity P(3HB). It was proved that the degree of accumulation of P(3HB) in activated sludge was comparable in both series. The highest P(3HB) yield of 0.59 g P(3HB)/g COD was attained in series 1 at the 12 th our after ceasing the nitrogen feeding. In series 1, between the 36 th and 48 th hour, the productivity reached the level of about 34 mg P(3HB)/l?h). In series 2, YP(3HB)/C and the productivity accounted for 0.21 g P(3HB)/g ChZT and 21.58 mg P(3HB)/l?h, respectively. The limiting factor of P(3HB) productivity was low specific growth rate of microorganisms of activated sludge. The maximum specific growth (max) reached 0.03 h-1 in series 1 and 0.022h-1 in series 2.

The dynamics of biological reduction of phosphorus and nitrogen compounds in the UCT model system

88%

Czerska B. , Miksch K. , Surmacz-Gorska J. , Debkowska Z.

nr 3

108-115

Investigations on dynamics of and reduction in the system were conducted. After three-week adaptation period, population of activated sludge microorganisms indicated capacity for excessive phosphorus uptake. Source of carbon in synthetic nutrient medium was then sodium acetate (0,5g/l), the concentration of PO4 - 30 mg/l and the NH4 concentration - 60mg/l. At the second stage of the studies the PO3/4 concentration was 15 mg/l in inflow., with increased up to 40 mg/l under anaerobic conditions and decreased to 0,5-1,5 mg/l under aerobic conditions. Togrether wiyth conversions of phosphorus compounds, nitrification processes occurred under aerobioc conditions (12,10-23,15 mg/l) and dentrification in an anoxic reactor (0,1 - 9,5 mg/l). Intensity of the phosphorus and nirogen conversions depended upon biomass loading, degree of recirulation and retention times in the reactors.