Challenge of High Water Hardness and Elevated Temperature: MBR Pilot Trials in the Paper Industry under Mesophilic and Thermophilic Conditions
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The results of two MBR pilot trials conducted in paper mills are discussed. In the first trial it was possible to operate a MBR pilot plant under the challenges of extremely high water hardness and a mean calcium concentration of 770 mg/L that caused massive scaling problems. An upstream lime softening pilot plant was designed and constructed. As a result, the flux increased again and the cleaning intervals could be extended significantly. With the help of lime softening, 50-80 % of the calcium was removed upstream of the MBR pilot plant. The second part of the paper describes trials using a thermophilic aerobic MBR (TMBR) at 50?°C. A new and innovative use of submerged flat-sheet MBR-modules to treat paper industry circuit wastewater was studied. The elimination rates of the TMBR regarding COD and BOD5 were 83 % and 99 %, respectively. A pilot trial was conducted at a flux of 4.5 to 8.5 L/m²/h. Lab experiments with a smaller membrane module had shown a higher flux of 8 to 13 L/m²/h.
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