Biological Nutrient Removal (BNR) is a process used for nitrogen and phosphorus removal from wastewater before it is discharged into surface or ground water.

The rising concentration of harmful nutrient compounds – specifically nitrogen and phosphorus – in municipal wastewater treatment plant discharge causes cultural eutrophication (nutrient enrichment due to human activities) in surface waters.

Because conventional biological processes designed to meet secondary treatment effluent standards typically do not remove total nitrogen and total phosphorus to the extent needed to protect receiving waters, wastewater treatment facilities are increasingly being required to implement processes that reduce effluent nutrient concentrations to safe levels. This can be a challenge for wastewater treatment plants because it usually involves major process modifications to a plant, such as making a portion of the aeration basin anaerobic and/or anoxic, which reduces the aerobic volume and limits nitrification capacity.

Clarifier solids loading usually limits the concentration of biomass available for nitrification, so it’s common to increase bioreactor volume to increase treatment capacity. This can be very expensive and even impossible if space is limited.

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Secondary Treatment

Actuated Tilting Weir

The Wamechsi Group Belt Conveyor are transportation ...

Channel Gates

The Wamechsi Group’s Channel Gates and Penstocks act as a ...

Axial Flow Pumps

The Wamechsi Group’s Axial Flow Pumps are used for ...

Vertical Shaft Mixer

- Sufficient thrust to suspend solids - Operating Speed ...

Vertical Shaft Aerator

- Rag free during operation. - Pumping capacity of up to 6 ...

Telescopic Valve

- Effective control of process flow of wastewater treatment ...

Clarifier

- High reduction of wastewater flow velocity to ensure ...