[1. Climent, M., Ferrerb, I., del Mar Baezac, M., Artola, A., Vázquezb, F. & Font, X. (2007). Effects of thermal and mechanical pretreatments of secondary sludge on biogas production under thermophilic conditions. Chem. Eng. J. 133, 335–342. DOI: 10.1016/j.cej.2007.02.020.10.1016/j.cej.2007.02.020]Open DOISearch in Google Scholar
[2. Zhang, H. (2010). Sludge treatment to increase biogas production. Trita-LWR Degree Project 10–20, Stockholm, Sweden.]Search in Google Scholar
[3. Foladori, P., Andreottola, G. & Ziglio, G. (2010). Sludge reduction technologies in wastewater treatment plants. IWA Publishing, London.10.2166/9781780401706]Search in Google Scholar
[4. Bougrier, C., Carrere, H. & Delgenes, J. (2005). Solubilisation of waste-activated sludge by ultrasonic treatment. Chem. Eng. J. 106, 163–169. DOI: 10.1016/j.cej.2004.11.013.10.1016/j.cej.2004.11.013]Open DOISearch in Google Scholar
[5. Zhang, P., Zhang, G. & Wang, W. (2007). Ultrasonic treatment of biological sludge: Floc disintegration, cell lysis and inactivation. Bioresource Technol. 98, 207–210. DOI: 10.1016/j.biortech.2005.12.002.10.1016/j.biortech.2005.12.002]Open DOISearch in Google Scholar
[6. Zhang, G., Yang, J., Liu, H. & Zhang, J. (2009). Sludge ozonation: Disintegration, supernatant changes and mechanisms. Bioresource Technol. 100, 1505–1509. DOI: 10.1016/j.biortech.2008.08.041.10.1016/j.biortech.2008.08.041]Open DOISearch in Google Scholar
[7. Neyens, E. & Baeyens, J. (2003). A review of thermal sludge pre-treatment processes to improve dewaterability. J. Hazard. Mater. B98, 51–67. DOI: 10.1016/S0304-3894(02)00320-5.10.1016/S0304-3894(02)00320-5]Open DOISearch in Google Scholar
[8. Pilli, S., Yan, S., Tyagi, R.D. & Surampalli, R.Y. (2015). Thermal pretreatment of sewage sludge to enhance anaerobic digestion: A review. Crit. Rev. Environ. Sci. Technol. 45(6), 669–702. DOI: 10.1080/10643389.2013.876527.10.1080/10643389.2013.876527]Search in Google Scholar
[9. Ferrer, I., Ponsá, S., Vázquez, F. & Font, X. (2008). Increasing biogas production by thermal (70°C) sludge pre-treatment prior to thermophilic anaerobic digestion. Biochem. Eng. J. 42, 186–192. DOI: 10.1016/j.bej.2008.06.020.10.1016/j.bej.2008.06.020]Open DOISearch in Google Scholar
[10. Appels, L., Houtmeyers, S., Degrève, J., Impe, J.V. & Dewil, R. (2013). Influence of microwave pre-treatment on sludge solubilization and pilot scale semi-continuous anaerobic digestion. Bioresource Technol. 128, 598–603. DOI: 10.1016/j.biortech.2012.11.007.10.1016/j.biortech.2012.11.00723211486]Search in Google Scholar
[11. Tyagi, V. & Lo, S. (2013). Microwave irradiation: A sustainable way for sludge treatment and resource recovery. Renew. Sust. Energ. Rev. 18, 288–305. DOI: 10.1016/j.rser.2012.10.032.10.1016/j.rser.2012.10.032]Open DOISearch in Google Scholar
[12. Li, H., Li, C., Liu, W. & Zou, S. (2012). Optimized alkaline pretreatment of sludge before anaerobic digestion. Bioresource Technol. 123, 189–194. DOI: 10.1016/j.biortech.2012.08.017.10.1016/j.biortech.2012.08.01722940318]Open DOISearch in Google Scholar
[13. Zhang, Y., Zhang, P. Zhang, G. Ma, W. Wu, H. & Ma, B. (2012). Sewage sludge disintegration by combined treatment of alkaline + high pressure homogenization. Bioresource Technol. 123, 514–519. DOI: 10.1016/j.biortech.2012.07.078.10.1016/j.biortech.2012.07.07822940362]Open DOISearch in Google Scholar
[14. Eskicioglu, C., Kennedy, K. & Ronald, D.R. (2006). Characterization of soluble organic matter of waste activated sludge before and after thermal pretreatment. Water Res. 40, 3725–3736. DOI: 10.1016/j.watres.2006.08.017.10.1016/j.watres.2006.08.01717028065]Open DOISearch in Google Scholar
[15. Cui, R. & Jahng, D. (2006). Enhanced methane production from anaerobic digestion of disintegrated and deproteinized excess sludge. Biotechnol. Lett. 28, 531–538. DOI: 10.1007/s10529-006-0012-9.10.1007/s10529-006-0012-916614889]Open DOISearch in Google Scholar
[16. Carlson, M., Lagerkvist, A. & Morgan-Sagastume, F. (2012). The effect of substrate pre-treatment on anaerobic digestion system: A review. Waste Management. 32, 1634–1650. DOI: 10.1016/j.wasman.2012.04.016.10.1016/j.wasman.2012.04.01622633466]Open DOISearch in Google Scholar
[17. Martínez, E., Rosas, J., Morán, A. & Gómez, X. (2015). Effect of ultrasound pretreatment on sludge digestion and dewatering characteristics: Application of particle size analysis. Water 7(11), 6483–6495. DOI: 10.3390/w7116483.10.3390/w7116483]Open DOISearch in Google Scholar
[18. Wu, Q.L., Guo, W.Q., Zheng, H.S., Luo, H.Ch., Feng, X.Ch., Yin, R.L. & Ren, N.Q. (2016). Enhancement of volatile fatty acid production by co-fermentation of food waste and excess sludge without pH control: The mechanism and microbial community analyses. Bioresource Technol. 216, 653–660. DOI: 10.1016/j.biortech.2016.06.006.10.1016/j.biortech.2016.06.00627289056]Open DOISearch in Google Scholar
[19. Huan, L., Yiying, J., Bux Mahar, R., Zhiyu, W. & Yongfeng, N. (2009). Effects of ultrasonic disintegration on sludge microbial activity and dewaterability. J. Hazard. Mater. 161, 1421–1426. DOI: 10.1016/j.jhazmat.2008.04.113.10.1016/j.jhazmat.2008.04.11318547717]Open DOISearch in Google Scholar
[20. Xiao, B.Y. & Liu, J.X. (2009). Effects of various pretreatments on biohydrogen production from sewage sludge. Chin. Sci. Bull. 54, 2038–2044. DOI: 10.1007/s11434-009-0100-z.10.1007/s11434-009-0100-z]Open DOISearch in Google Scholar
[21. Jung, Y., Ko, H., Jung, B. & Sung, N. (2011). Application of ultrasonic system for enhanced sewage sludge disintegration: A comparative study of Single- and dual-frequency. KSCE J. Civ. Eng. 15, 793–797. DOI: 10.1007/s12205-011-0832-6.10.1007/s12205-011-0832-6]Open DOISearch in Google Scholar
[22. Negral, L., Marañón, E., Castrillón, L. & Fernández-Nava, Y. (2015). Differences in soluble COD and ammonium when applying ultrasound to primary, secondary and mixed sludge. Water Sci. Technol. 71, 1398–406. DOI: 10.2166/wst.2015.113.10.2166/wst.2015.113]Open DOISearch in Google Scholar
[23. Jin, L., Zhang, G. & Zheng, X. (2015). Effects of different sludge disintegration methods on sludge moisture distribution and dewatering performance. J. Environ. Sci. 28, 22–28. DOI: 10.1016/j.jes.2014.06.040.10.1016/j.jes.2014.06.040]Open DOISearch in Google Scholar
[24. Penaud, V., Delgenès, J.P. & Moletta, R. (1999). Thermochemical pretreatment of a microbial biomass: influence of sodium hydroxide addition on solubilization and anaerobic biodegradability. Enzyme Microb. Tech. 25, 258–263. DOI: 10.1016/S0141-0229(99)00037-X.10.1016/S0141-0229(99)00037-X]Open DOISearch in Google Scholar
[25. Sperling, M. (2007). Basic principles of wastewater treatment. IWA Publishing, Vol. 2, London.]Search in Google Scholar
[26. Zawilski, M. & Brzezińska, A. (2009). Variability of COD and TKN fractions of combined wastewater. Pol. J. Environ. Stud. 18, 501–505.]Search in Google Scholar
[27. Henze, M., Gujer, W., Mino, T. & van Loosdrecht, M. (2007). Activated sludge models ASM1, ASM2, ASM2d, ASM3. IWA Tasc Group on Mathematical Modelling for Design and Operation of Biological Wastewater Treatment, London.]Search in Google Scholar
[28. Dulekgurgen, E., Doğruel, S., Karahan, Ö. & Orhon, D. (2006). Size distribution of wastewater COD fractions as an index for biodegradability. Water Res. 40, 273–282. DOI: 10.1016/j.watres.2005.10.032.10.1016/j.watres.2005.10.03216376405]Open DOISearch in Google Scholar
[29. Hayet, C., Saida, B.A., Touhami, Y. & Hedi, S. (2016). Study of biodegradability for municipal and industrial Tunisian wastewater by respirometric technique and batch reactor test. Sustain. Environ. Res. 26, 55–62. DOI: 10.1016/j.serj.2015.11.001.10.1016/j.serj.2015.11.001]Open DOISearch in Google Scholar
[30. Junoh, H., Yip, CH. & Kumaran, P. (2016). Effect on Ca(OH)2 pretreatment to enhance biogas production of organic food waste, International Conference on Advances in Renewable Energy and Technologies (ICARET 2016), IOP Publishing, IOP Conf. Series: Earth and Environmental Science, Vol. 32. Putrajaya, Malaysia. DOI: 10.1088/1755-1315/32/1/012013.10.1088/1755-1315/32/1/012013]Open DOISearch in Google Scholar
[31. Sadecka, Z., Jędrczak, A. & Płuciennik-Koropczuk, E. (2013). COD Fractions in Sewage Flowing into Polish Sewage Treatment Plants. Chem. Biochem. Eng. Q. 27(2), 185–195.]Search in Google Scholar
[32. Wentzel, M.C., Mbewe, A., Lakay, M.T. & Ekama, G.A. (1999). Batch test for characterisation of the carbonaceous materials in municipal wastewaters. Water SA. 25(3), 327–335.]Search in Google Scholar
[33. Henze, M., Gujer, W., Mino, T. & von Loosdrecht, M. (2000). Activated sludge models ASM1, ASM2, ASM2d and ASM3. IWA Task Group on Mathematical Modelling for Design and Operation of Biological Wastewater Treatment; IWA Scientific and Technical Reports, London.]Search in Google Scholar
[34. Wintle, B. (2008). The use of activated sludge model No. 3 to model an activated sludge unit at an industrial wastewater treatment facility. Master of Science. Environmental Engineering Oklahoma State University Stillwater, Oklahoma.]Search in Google Scholar
[35. Specialized Committees ATV-DVWK. ATV-DVWK – A131P. (2000). Dimensioning of biological activated treatment plant (in Polish). Seidel-Przywecki. Warsaw.]Search in Google Scholar
[36. Appels, L., Degrèvea, J., Bruggen, B., Impe, J. & Dewil R. (2010). Influence of low temperature thermal pre-treatment on sludge solubilisation, heavy metal release and anaerobic digestion, Bioresource Technol. 101(15), 5743–5748. DOI: 10.1016/j.biortech.2010.02.068.10.1016/j.biortech.2010.02.06820335023]Open DOISearch in Google Scholar
[37. Farno, E., Baudez, J.C., Parthasarathy, R. & Esshtiaghi, N. (2016). Impact of thermal treatment on the rheological properties and composition of waste activates sludge: COD solubilisation as a footprint of rheological changes. Chem. Eng. J. 295, 39–48. DOI: 10.1016/j.cej.2016.03.022.10.1016/j.cej.2016.03.022]Open DOISearch in Google Scholar
[38. Myszograj, S. (2013). Effects of the solubilisation of the COD of municipal waste in thermal disintegration. Arch. Environ. Protect. 39(2), 57–67. DOI: 10.2478/aep-2013-0014.10.2478/aep-2013-0014]Open DOISearch in Google Scholar
[39. Aboulfoth, A.M., El Gohary, E.H. & El Monayeri, O.D. (2015). Effect of thermal pretreatment on the solubilization of organic matters in a mixture of primary and waste activated sludge. J. Urban Environ. Eng. 9(1), 82–88. DOI: 10.4090/juee.2015.v9n1.082088.10.4090/juee.2015.v9n1.082088]Open DOISearch in Google Scholar
[40. Henze, M., Gujer, W., Mino, T., Matsuo, T., Wentzel, M.C., Marais, G.v.R. & Van Loosdrecht, M.C. (1999). Activated sludge model No2D, ASM2D. Water Sci. Technol. 39(1), 165–182. DOI: 10.1016/S0273-1223(98)00829-4.10.1016/S0273-1223(98)00829-4]Open DOISearch in Google Scholar
[41. Kumi, P.J., Henley, A., Shana, A., Wilson, W. & Esteves, S.R. (2016). Volatile fatty acids platform from thermally hydrolysed secondary sewage sludge enhanced through recovered micronutrients from digested sludge. Water Res. 100, 267–276. DOI: 10.1016/j.watres.2016.05.030.10.1016/j.watres.2016.05.03027206055]Open DOISearch in Google Scholar
[42. Mikosz, J. (2015). Determination of permissible industrial pollution load at a municipal wastewater treatment plant. Int. J. Environ. Sci. Technol. 12, 827–836. DOI: 10.1007/s13762-013-0472-0.10.1007/s13762-013-0472-0]Open DOISearch in Google Scholar
[43. Penn, M.R., Pauer, J.J. & Mihelcic, J.R. (2009). Biochemical oxygen demand. Environ. Ecol. Chem. 2, 278–297.]Search in Google Scholar