Biological Removal of Carbon, Nitrogen, and Phosphorus in a Sequencing Batch Reactor

Abstract

In this research the process performance of enhanced biological phosphorus removal was investigated in a sequencing batch reactor (SBR) having a new operational mode. The SBR system used in this study had simultaneous feeding and decanting conditions. The laboratory scale reactor (10 L) was operated for 392 days. The system was operated under 4 different sets each having 2 cycles per day. In each cycle, fill (4 h), anoxic (0.5 h), aerobic (7 h) and settling phases were present. In the fill phase, wastewater was fed from the bottom and the anoxic/anaerobic conditions were established in the settled sludge. During filling, the water left the system by water displacement. The system provided nitrification, denitrification as well as phosphorus and organic removal. High COD (90-98%), PO4-P (77-100%), and NH4-N (90-95%) removals were achieved by this system.

Monitoring and control of biological nutrient removal in a Sequencing Batch Reactor

“…KH 2 PO 4 and K 2 HPO 4 were used as phosphorus sources (20 mg PO 4 -P l À1 ) and NH 4 Cl as nitrogen source (50 mg NH 4 -N l À1 ). The composition of the synthetic feed is given in [6]. No acid or base addition was needed in order to regulate the pH level during the denitrification-nitrification process.…”

“…The effective volume of the SBR reactor was 10 l. The reaction durations in the reactor were manipulated with the use of a system with an automatic time set up. The system used was explained previously in [6].…”

Optimization of Fenton-biological treatment scheme for the treatment of aqueous dye solutions

“…During the acclimation, reactors were fed with the tap water containing 0.4 g of dextrose providing 400 mg COD [45] as a carbon source for a period of 20 days. Every alternate day 0.5 L supernatant was withdrawn and 0.5 L feed was added to the reactors.…”

Degradation of azo dyes by sequential Fenton's oxidation and aerobic biological treatment

“…During the acclimation, reactors were fed with the tap water containing 0.4 g of dextrose providing 400 mg COD [21] as a carbon source for a period of 73 days. Every alternate day 0.5 l supernatant was withdrawn and 0.5 l feed was added to the reactor.…”