Compressed Air Best Practices - November 2008 - (Page 29) Focu Indus Focus Industry STEEL & METALS ocu nd STEEL METAL E TALS A | 11–12/08 | Clogged MBR and High Disposal Costs “The oil from the die lube and the glycol from the hydraulic fluid combine to create an extremely difficult wastewater treatment challenge,” explains Bill Cleary. “We cannot use flammable hydraulic oil because of the high temperatures of the molten metal. Instead, we use glycol, which must be removed to meet our COD discharge limits.” The plant’s original physical-chemical wastewater treatment system performed poorly, because it was difficult to maintain a consistent recipe. This situation was further complicated by the uncontrolled and unpredictable flow rate and the difficult composition of the wastewater stream. In 1995, the plant installed a bioreactor system to consume the glycol. The membrane bioreactor (MBR) system was arranged with the tubular membranes external from the bioreactor, thus separating the water from the activated sludge. The effluent from the MBR was polished by a reverse osmosis (RO) system, prior to discharge into the municipal wastewater system [Figure 1]. Figure 1 29 http://www.awarenessideas.com
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