Characterization of rice hull ash and its performance in turbidity removal from water

F. V. Adams, B. D. Ikotun, D. O. Patrick, A. F. Mulaba-Bafubiandi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This study characterizes the locally obtained samples of rice hull ash and investigates its performance on turbidity removal from water. Four samples of this material were studied, namely, unwashed parboiled rice hull ash (UPRHA), washed parboiled rice hull ash (WPRHA), unwashed unparboiled rice hull ash (UUPRHA), and washed unparboiled rice hull ash (WUPRHA). Scanning electron microscopy (SEM), x-ray diffractometer (XRD), and Fourier infrared spectroscopy (FTIR) were carried out to characterize these samples. A filtration process was carried out to investigate the effectiveness of the rice hull ash medium in removing water turbidity. The XRD results showed the silica, which is present in the ashes, to be cristobalite, quartz, and tridymite. The silica contents of the UUPRHA and WUPRHA were observed to be 77.10% and 98.24%, respectively, while those of UPRHA and WPRHA were 79.07% and 94.97%, respectively. The SEM images showed agglomeration of ash particles after the ashes were washed. The washed RHA samples showed improved pH, a good percentage of turbidity removal (<5 NTU) from water sample. Washing RHA with distilled water increased the efficiency of RHA in turbidity removal from water and regulated water pH to an acceptable range.

Original languageEnglish
Pages (from-to)329-333
Number of pages5
JournalParticulate Science and Technology
Issue number4
Publication statusPublished - 4 Jul 2014


  • Chemical composition
  • SEM
  • XRD
  • rice hull ash
  • turbidity

ASJC Scopus subject areas

  • General Chemical Engineering


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