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Evaluation of textile wastewater treatment in sequential anaerobic moving bed bioreactor - aerobic membrane bioreactor

M. Kozak,Kevser Cırık,M. Dolaz,S. Başak

Published 2021 in Process Biochemistry

ABSTRACT

Abstract In this study, the treatability of real textile wastewater [dissolved organic carbon (DOC): 500 mg/L), color: 6383 Pt-Co, sulfate: 362 mg/L)] was investigated in sequential anaerobic moving bed bioreactor (AnMBBR) and aerobic membrane bioreactor (AeMBR). AnMBBR was filled with 40% career material (Kaldnes K1). The effect of different hydraulic retention times (HRTs) (6-48 h) and powdered activated carbon (PAC) addition (1 g/L) was investigated for system optimization.. Sequential AnMBBR- AeMBR was successfully operated for textile wastewater treatment corresponding to 92%, and 90% dissolved organic carbon (DOC) and color removals, respectively. The effluent quality, dropped under 45 Pt-Co and 18 mg/L effluent values, was relatively high and complianted with discharge standards. The Fourier transform infrared spectroscopy (FT-IR) analysis showed that primary amines are successfully removed in AeMBR effluent. Fouling in AeMBR was increased when HRT was reduced, however, improved by 90% at PAC addition conditions. Except for soluble microbial products (SMP) and soluble extracellular polymeric substances (EPS), it was observed that silicon (Si) (13.16%) has an important role in fouling which was confirmed by scanning electron microscopy (SEM) and Energy-Dispersive X-ray (EDX) analysis. Additionally, microbial community structures indicated that the membrane fouling can be caused by Alphaproteobacteria (80%) which was the dominant culture in the biofilm layer at a maximum fouling rate.

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