1. A. Kelessidis, and A.S. Stasinakis, “Comparative Study of the methods used for treatment and final disposal of sewage sludge in European countries”, Waste Management, Vol. 32 (6), pp. 186-195, 2012.
2. M. Lundin, M. Bisaillon, G.J Pettersson, and H. Zetterlund, “Environmental and economic assessment of sewage sludge handling options”, Resources Conservation and Recycling, Vol. 41 (4), pp. 255-278, 2004.
3. Y. Wang, Y. Li, and G. Wu, “SRT contributes significantly to sludge reduction in the OSA-based activated sludge process”, Environmental Technology, Vol. 38 (3), pp. 305-315, 2016.
4. European Union, “Directive 2000/60/EC of the European Parliament and of the council of 23 October 2000 establishing a framework for Community action in water policy”, Vol. 327, pp. 1–73, 2000.
5. B. Xiao, H. Li, H. Yan, and X. Guo, “Evaluation of the sludge reduction effectiveness of a metabolic uncoupler-tetrakis (hydroxymethyl) phosphonium sulfate in anaerobic/anoxic/oxic process”, Desalination and Water Treatment, Vol. 57, pp. 5772–5780, 2016.