Yazar "Kozak, Melike" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Evaluation of textile wastewater treatment in sequential anaerobic moving bed bioreactor - aerobic membrane bioreactor
    (Elsevier, 2021) Kozak, Melike; Cırık, Kevser; Dolaz, Mustafa; Başak, Serden
    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.
  • Küçük Resim
    Öğe
    Treatment of textile wastewater using combined anaerobic moving bed biofilm reactor and powdered activated carbon-aerobic membrane reactor
    (Elsevier, 2021) Kozak, Melike; Cırık, Kevser; Başak, Serden
    In this study, treatment of textile wastewater using sequencing anaerobic moving bed biofilm reactor (AnMBBR) and powdered activated carbon - aerobic membrane bioreactor (PAC-AeMBR) was investigated. MBBR was composed by an anaerobic bioreactor with a biocarrier K1 with a filling ratio of 40% (v:v) and operated with 5 different aeration rates (0-0.55 m3air/m3reactor.min), at a constant HRT of 6 h to evaluate the effect of oxygen on AnMBBR system. The AnMBBR effluent was fed to the PAC-AeMBR for further treatment. In the AnMBBR operation, the adverse effect of aeration on anaerobic color removal was observed when ORP values increased over - 300 mV corresponding to aeration rates over 0.019 m3air/m3reactor.min, showing high toleration of biofilm layer. Limited aerated MBBR pretreatment provided long-term operation of MBR by decreasing frequency of membrane fouling. The relative abundance of EPS-producing bacteria namely Alphaproteobacteria (68%) was remarkably high in PAC-AeMBR. Considering the obtained results, it was concluded that the AnMBBR and PAC-AeMBR systems with high removals presented itself as a stable system.