Two-Stage Aerobic Treatment of Wastewater: a Case Study from Potato Chips Industry
T. Kupusović, S. Milanolo, D. Selmanagić
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Hydro Engineering Institute Sarajevo – HEIS, Stjepana Tomića 1, 71000 Sarajevo, Bosnia and Herzegovina
Pol. J. Environ. Stud. 2009;18(6):1045–1050
A two-stage aerobic treatment consisting of conventional active sludge treatment followed by membrane bio reactor has been tested for 100 days. The overall pollutant removal efficiencies (97.1% COD, 99.5% BOD5, 94.7% total nitrogen and 72.9% total phosphorous) are high enough to produce effluent that meets criteria for discharge to surface water with a relatively low amount of surplus sludge: 0.34 gSS (gCODremoved)-1. The only exception is total phosphorous concentration. The analysis of biodegradable COD in the effluent shows that only 14% is still biodegradable. Although the high quality effluent may be reused in preliminary soiled potato washing, the limiting criteria may be an increased concentration of chlorides.