Pelletized adsorbent of alum sludge and bentonite for removal of arsenic

Jung-Yeol JO, Jeong-Hwan CHOI, Yiu Fai TSANG, Kitae BAEK

Research output: Contribution to journalArticlespeer-review

30 Citations (Scopus)


Powder adsorbents show an excellent adsorption capacity for arsenic(As) due to the large specific surface area. However, the performance of powder adsorbents decreases significantly by channeling in the adsorption bed, and the powder is released from the bed. Pelletization of power adsorbent can solve the problems, and bentonite was proposed as a binder to improve the strength. The adsorption capacity and lifetime of pelletized adsorbent were evaluated through a batch and column study. The addition of bentonite decreased adsorption capacity by 16% of pellet without bentonite, but improved compressive strength of adsorbent up to 3.6 times. In the batch test, the maximum adsorption capacity of pelletized adsorbent is 22.2 mg As/g, which is about 40% of powder adsorbent. However, in the column study, pellet adsorbent showed similar adsorption performance and lifetime to commercial and powder adsorbent. As a result, the pellet adsorbent using bentonite is a potential low-cost adsorbent to remove effectively As in the aqueous phase. Copyright © 2021 Elsevier Ltd.
Original languageEnglish
Article number116747
JournalEnvironmental Pollution
Early online date18 Feb 2021
Publication statusPublished - 15 May 2021


Jo, J.-Y., Choi, J.-H., Tsang, Y. F., & Baek, K. (2021). Pelletized adsorbent of alum sludge and bentonite for removal of arsenic. Environmental Pollution, 277. Retrieved from


  • Alum sludge
  • Arsenic
  • Pelletization
  • Bentonite
  • Binder


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