1. Economic and environmental sustainability for anaerobic biological treatment of wastewater from paper and cardboard manufacturing industry.
- Author
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Tawfik, Ahmed, Bakr, Marwa H., Nasr, Mahmoud, Haider, Junaid, Mesfer, Mohammed k.Al, Lim, Hankwon, Qyyum, Muhammad Abdul, and Lam, Su Shiung
- Subjects
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SUSTAINABLE development , *WASTEWATER treatment , *SUSTAINABILITY , *TOTAL suspended solids , *COST effectiveness , *UPFLOW anaerobic sludge blanket reactors , *DIGESTIVE enzymes - Abstract
The sustainable application of an up-flow anaerobic baffled reactor (UABR) to treat real paper and cardboard industrial effluent (PCIE) containing bronopol (2-bromo-2-nitropropan-1, 3-diol) was investigated. At a hydraulic retention time (HRT) of 11.7 h and a bronopol concentration of 7.0 mg L−1, the removal efficiencies of total chemical oxygen demand (COD total), COD soluble , COD particulate , total suspended solids (TSS), volatile suspended solids (VSS), carbohydrates, and proteins were 55.3 ± 5.2%, 26.8 ± 2.3%, 94.4 ± 4.6%, 89.4 ± 2.6%, 84.5 ± 3.2%, 72.1 ± 1.8%, and 22.4 ± 1.8%, respectively. The conversion of complex organics (e.g., carbohydrates and proteins) into bio-methane (CH 4) was assisted via enzyme activities of, in U (100 mL)−1, α-amylase (224–270), α-xylanase (171–188), carboxymethyl cellulase (CM-cellulase) (146–187), polygalacturonase (56–126), and protease (67,000–75300). The acidogenic condition was dominant at a short HRT of 2.9 h, where methane yield dropped by 32.5%. Under this condition, the growth of methanogenic bacteria could be inhibited by volatile fatty acids (VFA) accumulation. The analysis of Fourier-transform infrared (FTIR) spectra detected peaks relevant to methylene and nitro groups in the sludge samples, suggesting that entrapment/adsorption by the sludge bed could be a major mechanism for removing bronopol. The economic feasibility of UABR, as proposed to receive 100 m3 d−1 of PCIE, showed a payback period (profits from environmental benefits, biogas recovery, and carbon credit) of 7.6 yr. The study outcomes showed a high connection to the environmental-, economic-, and social-related sustainable development goals (SDGs). [Display omitted] • First study on biogas recovery from real paper and cardboard industry effluents (PCIE). • Up-flow anaerobic baffled reactor showed 55.3% COD removal and 191 mL CH 4 (g COD removed)−1. • The acidogenic condition was dominant at a short HRT of 2.9 h. • Sustainable application of UABR was evaluated via cost benefits analysis. • Payback period from pollutant removal, biogas recovery, and carbon credit was 7.6 yr. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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