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Upgrade of an Oxidation Ditch Using Bio-Mass Carriers

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A wastewater treatment plant in Spain needed upgrading to comply with new inflow and quality requirements.

The existing plant was operating with two parallel Oxidation ditch modules with a flow rate of 550 m3/d each, and exhibited very poor nitrification capacity.

In order to improve the plant capacity and to improve the BOD and nitrogen removal, capacity of one module was expanded to treat an inflow of 1,100m3/d.

The system capacity was increased and upgraded by separating the original aerobic zone from the anoxic zone by vertical partitions and addition of Aqwise Biomass Carriers.

The upgraded module was designed to achieve BOD5 and Total N levels of <25 and <15 mg/L respectively. After an inoculation period, the plant produced effluent with an average BOD and nitrogen concentration of 11 and 9 mg/L respectively.
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Keywords: BOD; Biomass carriers; IFAS; Nitrogen removal; Oxidation ditch; Wastewater

Document Type: Research Article

Publication date: 2009-01-01

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