Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Energy generation by methanation of persistent wastes

Abstract

A 15-L anaerobic fixed-film reactor (AFFR) was evaluated for treating a trade effluent containing inhibitory concentrations of persistent branched-chain fatty acids, namely 2-ethylhexanoic acid (2-EHA) and neopentanoic acid (NPA), at a total of 17,000 mg COD/L. The AFFR was packed with fire-expanded clay spheres, and start-up was accomplished in 60 d. The organic load was increased in steps from 1.1 to 8.5 g COD/L/d. Total COD, 2-EHA, and NPA removal efficiencies were maintained above 70, 98, and 75%, respectively. The reactor could recover from a shock load of 150% increase in organic load. Combined mechanisms of organic adsorption and biodegradation rendered the AFFR more stable with shock loads. Mathane gas produced from the process could be used for preheating the effluent.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    Smith, C. R. (1970), inTopics in Lipid Chemistry, Gunstone, F. D., ed., Logos, London, pp. 277–368.

  2. 2.

    Yap, M. G. S., Relf, R. D., and Tan, S. B. (1990), inProceedings of Seminar on NUS-Industry Achievements in R & D Collaboration, pp. 67–71.

  3. 3.

    Massey, L. K., Sokatch, J. R., and Conrad, R. S. (1976),Bacteriol. Rev. 40, 42–54.

  4. 4.

    Ng, W. J., Yap, M. G. S., and Sivadas, M. (1989),Biol. Wastes 29, 299–311.

  5. 5.

    Chua, H., Yap, M. G. S., and Ng, W. J.Trans. IChemE. in press.

  6. 6.

    Sachs, E. F., Jennet, J. C., and Rand, M. C. (1982),J. Env. Eng. ASCE,102(EE2), 297–314.

  7. 7.

    Chua, H., Yap, M. G. S., and Ng, W. J. (1992),J. Appl. Biochem. Biotechnol. 34/35, 789–800.

  8. 8.

    APHA (1989),Standard Methods for the Examination of Waste and Wastwater, 17th ed. APHA, AWWA, WPCF, Washington, DC.

  9. 9.

    Labib, F., Ferguson, J. F., Benjamin, M. M., Mwrifh, M., and Ricker, N. L. (1992),Environ. Sci. Technol. 26, 369–376.

  10. 10.

    Chua, H. (1992), Anaerobic biological treatment of 2-ethylhexanoic acid. Ph.D. Thesis. National University of Singapore.

Download references

Author information

Correspondence to H. Chua.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Chua, H., Chen, Y.F., Yap, M.G.S. et al. Energy generation by methanation of persistent wastes. Appl Biochem Biotechnol 51, 673–680 (1995). https://doi.org/10.1007/BF02933468

Download citation

Index Entries

  • Anaerobic fixed-film reactor
  • branched-chain fatty acid
  • persistent organics
  • methanation