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A chemical plant in Tuas, Singapore, faces the problem of meeting the required standards for discharging their wastewater into public sewers. To ensure the quality of Singapore’s limited water resources, the treatment and discharge of industrial wastewater into public sewers are regulated by the Sewerage and Drainage Act and the Sewerage and Drainage (Trade Effluent) Regulations by the National Environment Agency. Typical conventional activated sludge (CAS) processes produce an effluent quality with COD exceeding 4,000 mg/L, reaching 10,000 mg/L at times, which exceeds discharge regulations.

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