TY - JOUR
T1 - Integration of sodium hypochlorite pretreatment with co-immobilized microalgae/bacteria treatment of meat processing wastewater
AU - Hu, Xinjuan
AU - Meneses, Yulie E.
AU - Aly Hassan, Ashraf
N1 - Funding Information:
The authors would like to thank the support from the at (UAEU) for partly financing this project under [grant number United States Geological Survey (USGS) and the Water for Food Daugherty Global Institute . The authors also would like to express their gratitude to the National Water Center United Arab Emirates University G00003296 ].
Funding Information:
The authors would like to thank the support from the United States Geological Survey (USGS) and the Water for Food Daugherty Global Institute. The authors also would like to express their gratitude to the National Water Center at United Arab Emirates University (UAEU) for partly financing this project under [grant number G00003296].
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/5
Y1 - 2020/5
N2 - Wastewater with 0.2, 0.4, 0.8, 1.0 mg/L free chlorine was biologically treated using co-immobilized microalgae/bacteria. In contrast, non-pretreated wastewater was treated with beads (control) and blank beads (blank) under the same operating condition. Results showed that NaClO pretreatment removed 8–33% total nitrogen (TN), 31–45% true color and 0.7–2.5 log CFU/mL aerobic-bacteria. At the end of treatment, maximum algal biomass (2,027 dry weight mg/L) was achieved with 0.2 mg/L free chlorine. Bacterial growth in wastewater was decreased by NaClO pretreatment before reaching 7.2–7.7 log CFU/mL on the fifth day. Beads with microorganisms (control) removed 15% more chemical-oxygen-demand (COD), 16% more TN, and 13% more total phosphate (PO43−) than blank. Pretreatment with 0.2 mg/L free chlorine increased TN removal from 75% to 80% while pollutants removal was substantially decreased with 0.4–1.0 mg/L free chlorine. Considering algal biomass growth and pollutants removal, 0.2 mg/L free chlorine pretreatment was recommended for microalgae/bacteria co-immobilized system.
AB - Wastewater with 0.2, 0.4, 0.8, 1.0 mg/L free chlorine was biologically treated using co-immobilized microalgae/bacteria. In contrast, non-pretreated wastewater was treated with beads (control) and blank beads (blank) under the same operating condition. Results showed that NaClO pretreatment removed 8–33% total nitrogen (TN), 31–45% true color and 0.7–2.5 log CFU/mL aerobic-bacteria. At the end of treatment, maximum algal biomass (2,027 dry weight mg/L) was achieved with 0.2 mg/L free chlorine. Bacterial growth in wastewater was decreased by NaClO pretreatment before reaching 7.2–7.7 log CFU/mL on the fifth day. Beads with microorganisms (control) removed 15% more chemical-oxygen-demand (COD), 16% more TN, and 13% more total phosphate (PO43−) than blank. Pretreatment with 0.2 mg/L free chlorine increased TN removal from 75% to 80% while pollutants removal was substantially decreased with 0.4–1.0 mg/L free chlorine. Considering algal biomass growth and pollutants removal, 0.2 mg/L free chlorine pretreatment was recommended for microalgae/bacteria co-immobilized system.
KW - Activated sludge bacteria
KW - Chlorine
KW - Co-immobilization
KW - Microalgae
KW - Wastewater
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U2 - 10.1016/j.biortech.2020.122953
DO - 10.1016/j.biortech.2020.122953
M3 - Article
C2 - 32087541
AN - SCOPUS:85079674054
SN - 0960-8524
VL - 304
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 122953
ER -