Modeling and optimization of process parametric interaction during high-rate anaerobic digestion of recycled paper mill wastewater using the response surface methodology

Author:

Zwain Haider M.1ORCID,Barghash Hind2ORCID,Vakili Mohammadtaghi3,Sh. Majdi Hasan4,Dahlan Irvan56ORCID

Affiliation:

1. College of Engineering, Al-Qasim Green University, Al-Qasim Province 51001, Babylon, Iraq

2. Department of Engineering, German University of Technology in Oman, Halban, Oman

3. Green Intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China

4. Department of Chemical Engineering and Petroleum Industries, Al-Mustaqbal University College, 51001 Hillah, Babylon, Iraq

5. School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Penang, Malaysia

6. Solid Waste Management Cluster, Science and Engineering Research Centre, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Penang, Malaysia

Abstract

Abstract This study carried out the anaerobic digestion of recycled paper mill wastewater (RPMW) in a high-rate novel anaerobic baffled reactor. The parametric interaction between influent chemical oxygen demand (CODin) and hydraulic retention time (HRT) was modeled, and process responses were optimized by the response surface methodology (RSM) using a three-level factorial design. The results showed that the optimal condition was determined at CODin of 4,000 mg/L and HRT of 2 days and predicted values for COD removal, biochemical oxygen demand (BOD) removal, lignin removal, CH4 content, and CH4 production were found to be 94%, 98%, 68%, 85%, and 20.8 L CH4/d, respectively. According to the statistical analysis of the RSM, all models were significant with very low probability values (from 0.0045 to <0.0001). The parametric interaction showed that increasing the CODin positively influenced the COD, BOD, and lignin removal efficiencies, effluent alkalinity, and methane content and production but was unfavorable for pH and effluent volatile fatty acid (VFA). Shortening the HRT negatively affected the COD, BOD, and lignin removal efficiencies, pH level, alkalinity, and methane content and production, and increased the VFA effluent concentration. The optimal conditions were established at 4,000 mg/L COD and HRT of 2 days, corresponding to the predicted COD, BOD, and lignin removal efficiencies of 91, 98, and 71%, respectively, whereas 28 mg/L of VFA and 0.125 L of CH4/g CODremoved were generated.

Funder

Universiti Sains Malaysia

Publisher

IWA Publishing

Subject

Filtration and Separation,Water Science and Technology

Reference26 articles.

1. Different bioreactors for treating secondary effluent from recycled paper mill;Science of The Total Environment,2019

2. Role of stage-separation in the ubiquitous development of anaerobic digestion of organic fraction of municipal solid waste: a critical review;Renewable and Sustainable Energy Reviews,2019

3. Performance and microbial community variations of a upflow anaerobic sludge blanket (UASB) reactor for treating monosodium glutamate wastewater: effects of organic loading rate;Journal of Environmental Management,2020

4. Modeling of modified anaerobic baffled reactor for recycled paper mill effluent treatment using response surface methodology and artificial neural network;Separation Science and Technology,2020

5. Department of Environment (DOE) 2009 Environmental Quality Act 1974 and Regulations. Environmental Quality (Industrial Effluent) Regulations 2009 (P.U. (A) 434/2009), Malaysia. Available from: http://apps.doe.gov.my/portal_efiles/e_regulation/view.php?file=Peraturan+-+Regulation/English/Environmental+Quality+(Industrial+Effluent)+Regulations+2009+-+P.U.(A)+434-2009.pdf.

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