Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2014.3455.3463ChittooBeverly S.SutherlandClint 1220141424In line with global sustainable development the search for
cost effective and eco-friendly disposal options for water treatment sludge
continues to be an urgent priority. In this study, the phosphate adsorption
potential of three types of water treatment sludge, namely; alum sludge, lime
sludge and lime-iron sludge were investigated through a series of batch experiments.
All three sludges exhibited potential for phosphate removal however; lime-iron
sludge produced the highest adsorption capacity which was 34 and 52% higher
than that for lime sludge and alum sludge, respectively. Phosphate adsorption
using alum sludge favoured slightly acidic conditions (pH 4) while lime sludge
and lime-iron sludge favoured slightly basic conditions at pH 8. Mathematical
simulation of the adsorption process was conducted using linear and non-linear
regression. Adsorption kinetics was analyzed using the pseudo-first-order, pseudo-second-order,
intraparticle diffusion and diffusion-chemisorption models. The goodness of
fit was assessed using the coefficient of determination (R2), the
Relative Percent Error (RPE) Marquardts
Percent Standard Deviation (MPSD) and Hybrid Error Function (HYBRID). The diffusion-chemisorption
model produced the highest correlation to reaction variables for all sludges
tested. It was successfully used to predict process kinetics which can aid in
the eventual development of full-scale design.]]>Yang, Y., Y.Q. Zhao, A.O. Babatunde, L. Wang, Y.X. Ren and Y. Han,200651193200Badmus, M.A.O., T.O.K. Audu and B.U. Anyata,2007Typanotonus fuscatus).]]>31251263Bakyayita, G.K.,20142014Dayton, E.A. and N.T. Basta,2001735257Duffy, S.J. and G.W. van Loon,19942819501956Farrell, P.B.,20122012Fernadez, N.A., E. Chacin, E. Gutierrez, N. Alastre, B. Llamoza and C.F. Forster,199554111115Genz, A., A. Kornmuller and M. Jekel,20043835233530Gibbons, K.M., M. Mortula and G.A. Gagnon,200958110Hayden, P.L. and A.J. Rubin,19741974pp: 317-381pp: 317-381Ho, Y.S., D.A.J. Wase and C.F. Forster,1996177177Ho, Y.S. and G. McKay,199870115124Ho, Y.S. and G. McKay,199816243255Ippolito, J.A., F.A. Barbarick, D.N. Heil, J.P. Chandler and E.F. Redente,20033218571864Tie, J., D. Chen, X. Li, X. Zhu, Y. Liu and Y. Liu,20102010pp: 13Kim, J.G., J.H. Kim, H.S. Moon, C.M. Chon and J.S. Ahn,2003146773Krim, L., S. Nacer and G. Bilango,200622732Kumar, K.V. and S. Sivanesan,20064111981202Lagergren, S.,189824139Liu, R.X., J.L. Guo and H.X. Tang,2002248268274Mohammed, W.T. and S.A. Rashid,20122012Mortula, M.M. and G.A. Gagnon,20074216851691Namasivayam, C. and K. Ranganathan,199382255261Nomanbhay, S.M. and K. Palanisamy,200584353Ofomaja, A.E., A. Pholosi and E.B. Naidoo,2014927178Panday, K.K., G. Prasad and V.N. Singh,198519869873Rahman, M.A., M.T. Islam, M. Nurnabi and P. Bala,201357284Sharma, Y.C., G. Prasad and D.C. Rupainwar,199137183191Sharma, D.C. and C.F. Forster,199622153160Sutherland, C.,20042004Sutherland, C. and C. Venkobachar,2010Fomes fasciatus.]]>1107117Weber, W.J. and J.C. Morris,19621962pp: 231266Yang, Y., D. Tomlinson, S. Kennedy and Y.Q. Zhao,200654207213Razali, M., Y.Q. Zhao and M. Bruen,200755300306