1. 5) McCarty, P. L. : Anaerobic waste treatment fundamentals, Part III: Toxic materials and their control, Public Works 95 (November), 91-94, 1964.
2. 6) Li, Y. Y., Ko, I. B., Noike, T., Funaishi, K. and Sasaki, H. : Comparison of Ammonia Inhibition between the methophilic and Thermophilic Anaerobic Digestion of Municipal Solid Wastes, Proc. 10th World Congress on Anaerobic Digestion, Vol. 1, 507-514, Montreal, 2004.
3. 7) Ho, L. and Ho, G. : Mitigating ammonia inhibition of thermophilic anaerobic treatment of digested piggy wastewater: use of pH reduction, zeolite, biomass and humic acid, Wat. Res., Vol. 46, 4339-4350, 2012.
4. 8) Walker, M., Iyer, K., Heaven, S. and Banks, C. J. : Ammonia removal in anaerobic digestion by biogas stripping: An evaluation of process alternatives using a first order rate model based on experimental findings, Chem. Eng. Jour., 178, 138-145, 2011.
5. 10) Menkveld, H. W. H. and Broeders, E.: Recovery of ammonium from digestate as fertilizer, 1st IWA Resource Recovery Conf., Ghent, Belgium, Aug. 29-Sep. 2, 2015.