TY - JOUR
T1 - Phosphorous removal from aqueous solution can be enhanced through the calcination of lime sludge
AU - Bal Krishna, K. C.
AU - Niaz, Mohamed R.
AU - Sarker, Dipok C.
AU - Jansen, Troy
PY - 2017
Y1 - 2017
N2 - Water treatment plants generate an enormous amount of the sludge which is normally treated as waste. In the recent past, many investigations have been focused on developing an economical adsorbent using water treatment sludge to remove phosphorous (P) from aqueous solutions. However, the great extents of the studies have been limited in the use of alum- and iron-based sludges. This study, therefore, investigated the P removal performance of the calcined lime sludge. Calcined lime sludge at 700ᵒC significantly enhanced the P removal efficiency whereas marginal improvement was noted when the sludge calcined at 400ᵒC was tested. With increase P removal efficiency, final pH values of the solution also significantly increased. P removal efficiency of the calcined sludge decreased with increasing the initial P concentrations. However, the removal efficiency could be improved by increasing the weight of the sludge. Further analysis demonstrated that P removal trend followed both pseudo-second order and diffusion-chemisorption kinetics signifying the P removal is potentially due to a multi-mechanistic reaction in which, the process is controlled by intra-particle diffusion followed by chemisorptions.
AB - Water treatment plants generate an enormous amount of the sludge which is normally treated as waste. In the recent past, many investigations have been focused on developing an economical adsorbent using water treatment sludge to remove phosphorous (P) from aqueous solutions. However, the great extents of the studies have been limited in the use of alum- and iron-based sludges. This study, therefore, investigated the P removal performance of the calcined lime sludge. Calcined lime sludge at 700ᵒC significantly enhanced the P removal efficiency whereas marginal improvement was noted when the sludge calcined at 400ᵒC was tested. With increase P removal efficiency, final pH values of the solution also significantly increased. P removal efficiency of the calcined sludge decreased with increasing the initial P concentrations. However, the removal efficiency could be improved by increasing the weight of the sludge. Further analysis demonstrated that P removal trend followed both pseudo-second order and diffusion-chemisorption kinetics signifying the P removal is potentially due to a multi-mechanistic reaction in which, the process is controlled by intra-particle diffusion followed by chemisorptions.
KW - phosphorus content
KW - sewage sludge
KW - water
KW - water treatment plant residuals
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:41369
U2 - 10.1016/j.jenvman.2017.06.003
DO - 10.1016/j.jenvman.2017.06.003
M3 - Article
SN - 0301-4797
VL - 200
SP - 359
EP - 365
JO - Journal of Environmental Management
JF - Journal of Environmental Management
ER -