TY - JOUR
T1 - A combined treatment approach for dye and sulfate rich textile nanofiltration membrane concentrate
AU - Balcik-Canbolat, Cigdem
AU - Olmez-Hanci, Tugba
AU - Sengezer, Cisel
AU - Sakar, Hacer
AU - Karagunduz, Ahmet
AU - Keskinler, Bulent
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - Fenton process and Fenton coupled biological treatment were examined for the treatment of the textile nanofiltration (NF) membrane concentrate. Maximum chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency was found to be 87.1% and 80.8% respectively at molar concentrations of 35 mM Fe2+ and 175 mM H2O2 and pH 3 for 30 min in the single Fenton process. As a second alternative, sequencing batch reactor (SBR) was operated to carry out biological treatment after Fenton process at a lower chemical dosage (pH: 3, CFe+2: 20 mM, CH2O2: 100 mM, 30 min). The ratio of biological oxygen demand in 5 days (BOD5)/COD was enhanced to 0.51 at molar concentrations of 20 mM Fe2+ and 100 mM H2O2. According to respirometric analysis and SBR results, it was stated that the oxidation intermediates formed during the treatment of membrane concentrate with Fenton process had no inhibitory/toxic effects on the hetetrophic biomass. The maximum COD removal efficiency in biological treatment after Fenton process was 75% under equilibrium condition using a SBR operated at 10 days of sludge retention time and 12 h of hydraulic retention time (HRT).
AB - Fenton process and Fenton coupled biological treatment were examined for the treatment of the textile nanofiltration (NF) membrane concentrate. Maximum chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency was found to be 87.1% and 80.8% respectively at molar concentrations of 35 mM Fe2+ and 175 mM H2O2 and pH 3 for 30 min in the single Fenton process. As a second alternative, sequencing batch reactor (SBR) was operated to carry out biological treatment after Fenton process at a lower chemical dosage (pH: 3, CFe+2: 20 mM, CH2O2: 100 mM, 30 min). The ratio of biological oxygen demand in 5 days (BOD5)/COD was enhanced to 0.51 at molar concentrations of 20 mM Fe2+ and 100 mM H2O2. According to respirometric analysis and SBR results, it was stated that the oxidation intermediates formed during the treatment of membrane concentrate with Fenton process had no inhibitory/toxic effects on the hetetrophic biomass. The maximum COD removal efficiency in biological treatment after Fenton process was 75% under equilibrium condition using a SBR operated at 10 days of sludge retention time and 12 h of hydraulic retention time (HRT).
KW - Biodegradability
KW - Fenton
KW - Nanofiltration membrane concentrate
KW - Sequencing batch reactor
KW - Textile wastewater
UR - http://www.scopus.com/inward/record.url?scp=85070954258&partnerID=8YFLogxK
U2 - 10.1016/j.jwpe.2019.100919
DO - 10.1016/j.jwpe.2019.100919
M3 - Article
AN - SCOPUS:85070954258
SN - 2214-7144
VL - 32
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 100919
ER -