PERFORMANCE OF COMPLETE-MIX AND PLUG-FLOW SYSTEMS DURING TREATMENT OF LOW LOADED NITROGEN DEFICIENT WASTE WATER – SIMULATION WITH ASAL1 MODEL

Abstract

Based on Modified Ludzack-Ettinger process, the performance of biological complete-mix and plug-flow units are compared during simulative treatment of low loaded nitrogen deficient wastewater. BOD-based model ASAL1 is applied. Different variants of nitrogen deficiency, Anoxic-Aerobic volume distributions, as well as diverse SSVI_3.5 are manipulated. It is shown that plug-flow reactors give better effluent quality over complete-mix systems in relation to indicators: total nitrogen, total BOD and total suspended solids. Nitrogen removal is primarily diminished with the increase of Anoxic against Aerobic zone, while SSVI_3.5 up to 200 ml/g has a less pronounced effect on this parameter. However,the  optimal nutrient composition gives the lowest nitrogen in the outcome stream – 95.53 % for plug-flow and 94.75 % for complete-mix series.