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Phosphorus Removal Device for Residential Unit

Background of the development

Phosphorus in wastewater is one of the causes of eutrophication in rivers, lakes and oceans. Eutrophication adversely affects the water environment causing many problems such as red tide and algal blooms. Discharged phosphorus in the environment is mostly from domestic wastewater - not from factories. Therefore domestic wastewater needs to be treated properly. Until now, there has been no phosphorus removal system, designed for domestic wastewater treatment that is small and easy to maintain.
Therefore, we developed a phosphorus removal device for domestic wastewater treatment.This device, our CRX model, enables removal of more than 80% of phosphorus in the wastewater.

Energy efficient

By passing direct current through a pair of iron electrodes immersed in water, divalent iron ion (Fe2+) is eluted from the anodal electrode. This iron is oxidized with dissolved oxygen to trivalent iron ion (Fe3+). Insoluble iron phosphate (FePO4) is formed and precipitated. Precipitated phosphorus is carried back to the head of the system using air lift pumps and is eventually removed as sludge.

Description of the Phosphorus Removal Device

Iron electrodes, a control box and a relay box.
Iron electrodes are immersed in the Aerobic Fluidized Bed Bio-film Filtration Chamber.
A contol box sends direct current (1 Amp) to the electrodes. Polarity is altered once a day to prevent oxide film covering the electrode surface.
A relay box connects iron electrodes to a control box.