Settled activated sludge that is returned to mix with raw or primary settled wastewater.
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Treatment Systems Ltd, Canices Court, Dean St., Kilkenny, Ireland. P: +353 56 7763932, info@treatmentsystems.ie VAT Number: IE6553577V. CRO Number 156077. Directors: Henk M. van der Puil, Seamus M. Crickley, M. Anthony Mahon
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