Modeling of SBR for wastewater treatment in Malaysia implementing ASM2 using AQUASIM

Abstract

The objective of this paper is to use modelling as a tool to investigate the use of sequencing batchreactors (SBRs) for wastewater treatment in Malaysia. A modified form of the Activated Sludge Model No. 2 (ASM2)was implemented using AQUASIM 2.0 as a modelling platform to simulate the microbial activities in a 10 litre singletank SBR reactor. The model results were compared to observed results in a real 10-litre system. The modelindicated a steady state mixed liquor suspended solid (MLSS) of 3260 mgSS/l. Removal efficiencies of COD, TN,NH4 + and NOx- were 89%, 91.5%, 99% and 100% respectively for the modelling compared with 89.5(±1.2)%, 91(±1.0)%, 98.5(±0.5)% and 98.75(±0.8)% respectively for the experiments. The rates of Nitrification anddenitrification were 13.7 and 18.3 [mgNOx --N/(l.h)] respectively for the modelling compared with 13.95(±1.0) and 18.1(±0.3) [mgNOx --N/(l.h)] respectively for the experiments. The study indicated that for design, operating and monitoring purposes, modelling can help in implementing a sludge control to determine the required biomassconcentration with a given react phase time.