Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Improving Anaerobic Digestion of Polyhydroxybutyrate by Thermal-Alkaline Pretreatment

열-알칼리성 전처리에 따른 폴리하이드록시부티레이트의 혐기성 소화 개선 효과 조사

  • Trang, Le Thi Nhu (Division of Earth Environmental System Science (Major of Environmental Engineering), Pukyong National University) ;
  • Lee, Joonyeob (Division of Earth Environmental System Science (Major of Environmental Engineering), Pukyong National University)
  • ;
  • 이준엽 (부경대학교 지구환경시스템과학부(환경공학전공))
  • Received : 2022.05.06
  • Accepted : 2022.05.25
  • Published : 2022.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the effect of different reaction times for thermal-alkaline pretreatment on the solubilization and biogasification of polyhydroxybutyrate (PHB) were evaluated. Thermal-alkaline pretreatment tests were performed at 73 ℃ and pH 13 at 0-120 h reaction times. The mesophilic anaerobic batch tests were performed with untreated and pretreated PHB samples. The increase in the pretreatment reaction time results in a 52.8-98.8% increase of the abiotic solubilization efficiency of the PHB samples. The reaction time required to achieve solubilization efficiencies of 50%, 90%, and 95% were 10.5, 52.0, and 89.6 h, respectively. The biogasification of the untreated PHB samples achieved a specific methane production rate of 3.6 mL CH4/g VSS/d and require 101.3 d for complete biogasification. The thermal-alkaline pretreatment significantly improved specific methane production rate (10.2-16.0 time increase), lag time (shortened by 76-81%), and time for complete biogasification (shortened by 21-83%) for the biogasification of the PHB samples when compared to those of the untreated PHB samples. The improvement was higher as the reaction time of the thermal-alkaline pretreatment increased. The findings of this study could be used as a valuable reference for the optimization of the biogasification process in the treatment of PHB wastes.

Keywords

Acknowledgement

본 연구는 2021년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구입니다(No. 2021R1C1C1009122). 또한 본 연구는 환경부의 폐자원에너지화 전문인력양성사업으로 지원되었습니다(YL-WE-21-002).

References

  1. APHA-AWWA-WEF, 2005, Standard methods for the examination of water and wastewater, 21st ed., American Public Health Association, Washington, DC.
  2. Benn, N., Zitomer, D., 2018, Pretreatment and anaerobic co-digestion of selected PHB and PLA bioplastics, Front. Environ. Sci., 5.
  3. Cazaudehore, G., Guyoneaud, R., Vasmara, C., Greuet, P., Gastaldi, E., Marchetti, R., Leonardi, F., Turon, R., Monlau, F., 2022, Impact of mechanical and thermo-chemical pretreatments to enhance anaerobic digestion of poly (lactic acid), Chemosphere, 297, 133986. https://doi.org/10.1016/j.chemosphere.2022.133986
  4. European Bioplastics, 2021, Bioplastics market data: global production capacities of bioplastics 2021, Berlin, Germany.
  5. Garcia-Depraect, O., Lebrero, R., Rodriguez-Vega, S., Bordel, S., Santos-Beneit, F., Martinez-Mendoza, L. J., Aragao Borner, R., Borner, T., Munoz, R., 2022, Biodegradation of bioplastics under aerobic and anaerobic aqueous conditions: Kinetics, carbon fate and particle size effect, Bioresour. Technol., 344, 126265. https://doi.org/10.1016/j.biortech.2021.126265
  6. Gavala, H. N., Angelidaki, I., Ahring, B. K., 2003, Kinetics and modeling of anaerobic digestion process, Adv. Biochem. Eng. Biotechnol., 81, 57-93.
  7. Horton, A. A., Walton, A., Spurgeon, D. J., Lahive, E., Svendsen, C., 2017, Microplastics in freshwater and terrestrial environments: Evaluating the current understanding to identify the knowledge gaps and future research priorities, Sci. Total Environ., 586, 127-141. https://doi.org/10.1016/j.scitotenv.2017.01.190
  8. Le, T. N. T., Lee, J., 2021, Effect of ammonia load on microbial communities in mesophilic anaerobic digestion of propionic acid. J. Environ. Sci. Int., 30, 1093-1100. https://doi.org/10.5322/JESI.2021.30.12.1093
  9. Lee, J., Kim, E., Hwang, S., 2021, Effects of inhibitions by sodium ion and ammonia and different inocula on acetate-utilizing methanogenesis: methanogenic activity and succession of methanogens, Bioresour Technol, 334, 125202. https://doi.org/10.1016/j.biortech.2021.125202
  10. Li, Q., Wang, A., Ding, W., Zhang, Y., 2017, Influencing factors for alkaline degradation of cellulose, BioResources, 12, 1263-1272.
  11. Mu, L., Zhang, L., Ma, J., Zhu, K., Chen, C., Li, A., 2021, Enhanced biomethanization of waste polylactic acid plastic by mild hydrothermal pretreatment: Taguchi orthogonal optimization and kinetics modeling, Waste Manage., 126, 585-596. https://doi.org/10.1016/j.wasman.2021.03.044
  12. PlasticsEurope, 2021, Plastics the facts 2021: an an - alysis of european plastics production, demand and waste data, Brussels, Belgium.
  13. Sirohi, R., Prakash Pandey, J., Kumar Gaur, V., Gnansounou, E., Sindhu, R., 2020, Critical overview of biomass feedstocks as sustainable substrates for the production of polyhydroxybutyrate (PHB), Bioresour. Technol., 311, 123536. https://doi.org/10.1016/j.biortech.2020.123536
  14. Yu, J., Plackett, D., Chen, L. X. L., 2005, Kinetics and mechanism of the monomeric products from abiotic hydrolysis of poly[(R)-3-hydroxybutyrate] under acidic and alkaline conditions, Polym. Degrad. Stab., 89, 289-299. https://doi.org/10.1016/j.polymdegradstab.2004.12.026