Abstract
Using the industrial wastewater from a dairy plant, the performance of enhanced biological phosphorus removal (EBPR) with complex organic substances was evaluated. A laboratory-scale sequencing batch reactor (SBR) was operated and the organic loading rate in total chemical oxygen demand (tCOD) increased gradually from 200– 600 g-tCOD m−3 cycle−1 in three steps. As the organic loading increased, the food to microorganism ratio ( F/M ) increased from 0.16–0.27 (g-tCOD/g-MLVSS d). When it increased over 600 g-tCOD m−3 cycle−1 , the effluent phosphorus concentration fluctuated, showing an unstable EBPR activity. During the anaerobic condition, higher fraction of poly-3-hydroxyvalerate (PHV) was observed and the ratio of PHV to poly-3-hydroxybuyrate (PHB) production ( ΔPHV/ΔPHB ) ranged 1.2∼3.4 mM-C/mM-C . PHV was produced faster and used later than PHB. By applying fluorescent in situ hybridization (FISH) technique, the percentage of Rhodocyclus-related bacteria to the total cell counts was monitored as...
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