1- Seka, A.M., Wiele, T.V.D., and Verstraete, W. (2001). “Feasibility of a multi component additive for efficient control of activated sludge filamentous bulking.” J. Water Res., 35(12), 2995-3003.
2- Tchobanoglus, G., and Burtaon, F. (2003). Wastewater engineering: Treatment and reuse, 4th Ed., McGraw-Hill, Metcalf and Eddy Inc.,New York.
3- Jin, B., Wilén, B., and Lant, B.M. (2003). “A comprehensive insight into floc characteristics and their impact on compressibility and settleability of activated sludge.” J. Chem. Eng., 95, 221-234.
4- Martins, A.M.P., Pagilla, K., Heijnen, J.J., and Loosdrecht, M.C.M. (2004). “Filamentous bulking sludge- a critical review.” J. Water Res., 38 (4), 793-817.
5- APHA. (1998). Standard methods for examination of water and wastewater, 20th Ed., American Public Health Association,WashingtonDC.
6- Wu, R.M., Lee, D.J., Wang, C.H., Chen, J.P., and Tan, R.B. (2001). “Novel cake characteristics of waste-activated sludge.” J. Water Res., 35(5), 1358-1362.
7- Jean, D.S., Lee, D.J., and Chang, C.Y. (2001). “Direct sludge freezing using dry ice.” J. Adv. Environ. Res., 5, 145-150.
8- Gong, R., Sun, Y., Chen, J., Liu, H., and Yang, C. (2005). “Effect of chemical modification on dye adsorption capacity of peanut hull.” J. Dyes Pigments., 67, 175-181.
9- Meyer, V., Carlsson, F.H.H., and Oellermann, R.A. (1992). “Decolourization of textile effluent using a low cost natural adsorbent material.” J. Water Sci. Technol., 26(5-6), 1205-1211.
10- Isa, M.H., Lee, Lang, S., Asaari, F.A.H., Hamidi, Aziz, A., Ramli, N.A., and Dhas, J.P.A. (2007). “Low cost removal of disperse dyes from aqueous solution using palm ash.” J. Dyes Pigments., 74, 446-453.
11- Santhy, K., and Selvapathy, P. (2006). “Removal of reactive dyes from wastewater by adsorption on coir pith activated carbon.” J. Bioresource Technol., 97, 1329-1336.
12- Demirbas, O., Karadag, A., Alkan, M., and Dogan, M. (2008). “Removal of copper ions from aqueous solutions by hazelnut shell.” J. Hazard Mater., 153, 677-684.
13- Farajzadeh, M. A., and Monji, A. B. (2004). “Adsorption characteristics of wheat bran towards heavy metal cations.” J. Sep. Purif. Technol., 38, 197-207.
14- Meunier, N., Blais, J. F., and Tyagi, R. D. (2002) “Selection of a natural sorbent to remove toxic metals from acidic leachate produced during soil decontamination.” J. hydrometallurgy, 67, 19-30.
15- Kuh, S.E., and Kim, D.S. (2000). “Removal characteristics of cadmium ion by waste egg shell.” J. Environ. Thechnol., 21(8), 883-890.
16- Ong, S.A., Lim, P.E., and Seng, C.E. (2003b). “Effects of adsorbents and copper(II) on activated sludge microorganisms and sequencing batch reactor treatment process.” J. Hazard Mater., 103, 263-277.
17- Hamoda, M. F., and Fahim, M. A. (1984). “Enhanced activated sludge waste treatment by the addition of adsorbents.” J. Environ. Pollut., 36(3), 283-294.
18- Choduba, P., and Pujol, R. (1996).“Activated sludge plant facing grape harvest period- Acase study.” J. Water Sci. Technol., 34(11), 25-32.