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

• Published in: Applied biochemistry and biotechnology Vol. 190; no. 3; pp. 851 - 866
• Main Author: Ahmad, A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2020; Springer Nature B.V
• Subjects: Biochemistry; Biological Oxygen Demand Analysis; Bioreactors; Biotechnology; Carbohydrates; Carbon dioxide; Carbon sequestration; Chemistry; Chemistry and Materials Science; Evolution; Fermentation; Lag phase; Metabolites; Metal Nanoparticles - chemistry; Methane; Methane - biosynthesis; Methanogenesis; Mixing ratio; Models, Theoretical; Nanoparticles; Petroleum; Petroleum industry wastewaters; Predictions; Process management; Sewage; Waste Water - chemistry; Wastewater treatment; Zinc oxide; Zinc Oxide - chemistry; Zinc oxides; System evaluation; Methane yield; ZnO nanoparticle; and solid wastes reduction; CO; PWW degradation; CO2 and solid wastes reduction
• ISSN: 0273-2289; 1559-0291
• DOI: 10.1007/s12010-019-03137-4

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
2
sequester 545 mL CO
2
/L PWW, production rate 750 mL CH
4
g-VS L PWW/h, and CH
4
yield was 4.85 L CH
4
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
hyd
), methanogenesis potential (
f
d
), 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.