TY - JOUR
T1 - Removal of nutrients from pulp and paper biorefinery effluent
T2 - Operation, kinetic modelling and optimization by response surface methodology
AU - Jagaba, Ahmad Hussaini
AU - Kutty, Shamsul Rahman Mohamed
AU - Naushad, Mu
AU - Lawal, Ibrahim Mohammed
AU - Noor, Azmatullah
AU - Affam, Augustine Chioma
AU - Birniwa, Abdullahi Haruna
AU - Abubakar, Sule
AU - Soja, Usman Bala
AU - Abioye, Kunmi Joshua
AU - Bathula, Chinna
N1 - Publisher Copyright:
© 2022 Elsevier Inc.
PY - 2022/11
Y1 - 2022/11
N2 - This study investigated the effectiveness of extended aeration system (EAS) and rice straw activated carbon-extended aeration system (RAC-EAS) in the treatment of pulp and paper biorefinery effluent (PPBE). RAC-EAS focused on the efficient utilization of lignocellulosic biomass waste (rice straw) as a biosorbent in the treatment process. The experiment was designed by response surface methodology (RSM) and conducted using a bioreactor that operated at 1–3 days hydraulic retention times (HRT) with PPBE concentrations at 20, 60 and 100%. The bioreactor was fed with real PPBE having initial ammonia-N and total phosphorus (TP) concentrations that varied between 11.74 and 59.02 mg/L and 31–161 mg/L, respectively. Findings from the optimized approach by RSM indicated 84.51% and 91.71% ammonia-N and 77.62% and 84.64% total phosphorus reduction in concentration for EAS and RAC-EAS, respectively, with high nitrification rate observed in both bioreactors. Kinetic model optimization indicated that modified stover models was the best suited and were statistically significant (R2 ≥ 0.98) in the analysis of substrate removal rates for ammonia-N and total phosphorus. Maximum nutrients elimination was attained at 60% PPBE and 48 h HRT. Therefore, the model can be utilized in the design and optimization of EAS and RAC-EAS systems and consequently in the prediction of bioreactor behavior.
AB - This study investigated the effectiveness of extended aeration system (EAS) and rice straw activated carbon-extended aeration system (RAC-EAS) in the treatment of pulp and paper biorefinery effluent (PPBE). RAC-EAS focused on the efficient utilization of lignocellulosic biomass waste (rice straw) as a biosorbent in the treatment process. The experiment was designed by response surface methodology (RSM) and conducted using a bioreactor that operated at 1–3 days hydraulic retention times (HRT) with PPBE concentrations at 20, 60 and 100%. The bioreactor was fed with real PPBE having initial ammonia-N and total phosphorus (TP) concentrations that varied between 11.74 and 59.02 mg/L and 31–161 mg/L, respectively. Findings from the optimized approach by RSM indicated 84.51% and 91.71% ammonia-N and 77.62% and 84.64% total phosphorus reduction in concentration for EAS and RAC-EAS, respectively, with high nitrification rate observed in both bioreactors. Kinetic model optimization indicated that modified stover models was the best suited and were statistically significant (R2 ≥ 0.98) in the analysis of substrate removal rates for ammonia-N and total phosphorus. Maximum nutrients elimination was attained at 60% PPBE and 48 h HRT. Therefore, the model can be utilized in the design and optimization of EAS and RAC-EAS systems and consequently in the prediction of bioreactor behavior.
KW - Ammonia
KW - Extended aeration activated sludge
KW - Pulp and paper biorefinery effluent
KW - Response surface methodology
KW - Rice straw
KW - Total phosphorus
UR - http://www.scopus.com/inward/record.url?scp=85137279706&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2022.114091
DO - 10.1016/j.envres.2022.114091
M3 - Article
C2 - 36041538
AN - SCOPUS:85137279706
SN - 0013-9351
VL - 214
JO - Environmental Research
JF - Environmental Research
M1 - 114091
ER -