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Bioprocess Evaluation of Petroleum Wastewater Treatment with Zinc Oxide Nanoparticle for the Production of Methane Gas: Process Assessment and Modelling

Applied Biochemistry and Biotechnology, ISSN: 1559-0291, Vol: 190, Issue: 3, Page: 851-866
2020
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Article Description

The process evaluation of zinc oxide nanoparticle (ZnO NP) was added to enhance the degradation of petroleum wastewater (PWW) fermentation system with different mixing ratios for enhancing methane production. The results showed that the highest methane yield and total solids (TS) removal ratio reached 485 mL/g-VS L PWW added and 81.9% at the ZnO NP g-VS L PWW ratio of 4.5:15, respectively. The proposed model CO sequester 545 mL CO/L PWW, production rate 750 mL CH g-VS L PWW/h, and CH yield was 4.85 L CH g-VS L PWW at 4.5:15 of ZnO NP g-VS L PWW. The kinetic analysis indicated that the modified Gompertz model best fitted the actual evolution of methane yields, as evidenced by the low root mean square prediction error (RMSPE) as well as high correlation difference between (Diff.%) the predicted and actual values. The parameters analyses were highlighted that the PWW digestion with ZnO NP substantially enhanced the hydrolysis rate (k), methanogenesis potential (f), lag phase time h (λ), and methane production rate (Rm) of PWW. The evolution of soluble metabolites, utilization of ZnO NP and carbohydrates were also improved by co-fermentation.

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