%0 Journal Article
%T PERFORMANCE OF A PILOT-SCALE MEMBRANE PROCESS FOR THE CONCENTRATION OF EFFLUENT FROM ALKALINE PEROXIDE MECHANICAL PULPING PLANTS
%A Yong Zhang
%A Chun-Yu Cao
%A Wen-Ying Feng
%A Guo-Xin Xue
%J BioResources
%D 2011
%I North Carolina State University
%X A pilot-scale membrane process for the concentration of effluent from an alkaline peroxide mechanical pulping (APMP) plant was investigated. Specifically, the cross-flow velocity and volume reduction were optimized again for a higher flux and a lower system energy consumption. A mathematical model was established to obtain the optimal parameters. Estimates were obtained of the expected savings in energy and water. The obtained optimal concentration conditions were: molecular weight cut-off at 10,000 Dalton, trans-membrane pressure at 3 bar, feed temperature at 50 oC, cross-flow velocity at 2 m/s, and volume reduction at 0.9. The average permeate flux under these conditions was 43.21 l/m2.h. The total solids content was increased from 25.47 g/L in the feed to 128.36 g/L in the concentrate. The permeate had low total solids content of 11.03 g/L, Chemical Oxygen Demand of 9180 mg/l, and Biochemical Oxygen Demand of 5870 mg/L. Such qualities would allow the permeate to be reused in the APMP process after a light biochemical treatment. With this new membrane concentration process, about 1402 kWh energy can be saved and 22 m3 effluent discharge can be reduced for each ton of pulp produced.
%K Pilot-scale membrane process
%K Concentrating
%K Alkaline peroxide mechanical pulping
%K Effluent
%K Mathematical model
%K Energy and water saving
%K Discharge reduction
%U www.ncsu.edu/bioresources/BioRes_06/BioRes_06_3_3044_Zhang_CFXX_Pilot_Scale_Membrane_Alk_H2O2_Mech_Pulping_1839.pdf