Simultaneous removal of nutrients in a novel anaerobic–anoxic/ aerobic sequencing reactor: removal of nutrients in a novel reactor|
Azhdarpoor, A.; Mohammadi, P. & Dehghani, M.
Discharging wastewater contaminated with
nitrogen and phosphorus compounds (nutrients) can be
harmful to both human health and the environment. The
present study investigated the efficiency of removing total
nitrogen, total phosphate, and chemical oxygen demand
using a novel reactor design. The reactor was an anaerobic–
anoxic/aerobic sequencing batch reactor with continuous
influent and discontinuous outlet. The operation
consisted of four phases. Phases 3 and 4 had mixing cycles,
whereas phases 1 and 2 only had aeration, settling, and
discharge cycles. Phase 4 was the most effective. The
average removal efficiencies for chemical oxygen demand,
NH4+, total nitrogen, and total phosphate in Phase 4 were
92, 91, 86, and 85 %, respectively. This phase comprised
225 min of intermittent aeration time, 165 min of intermittent
mixing time, and 90 min of settling and discharge.
In addition to high efficiency in nutrient removal, the
reactor had other advantages, including continuous flow
and performance in all phases.
Nitrogen; Phosphate; Sequencing batch reactor; Wastewater