Phosphorous removal from aqueous solution can be enhanced through the calcination of lime sludge

K. C. Bal Krishna, Mohamed R. Niaz, Dipok C. Sarker, Troy Jansen

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalJournal of Environmental Management
Volume200
DOIs
Publication statusPublished - 2017

Keywords

  • phosphorus content
  • sewage sludge
  • water
  • water treatment plant residuals

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