Use of rice straw-based biochar for batch sorption of barium/strontium from saline water: Protection against scale formation in petroleum/desalination industries

Sherif A. YOUNIS, Radwa A. EL-SALAMONY, Yiu Fai TSANG, Ki-Hyun KIM

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6 Citations (Scopus)

Abstract

The formation of hard mineral scale deposits (e.g., celestite (SrSO₄) and barite (BaSO₄)) is the most common problem that hinders sustainable operations of water-flooded oilfield and desalination systems (i.e., membrane fouling) when using poor quality water contaminated with barium (Ba(II)) and strontium (Sr(II)) ions. In this work, nanoscale biochar (∼53–712 nm) was synthesized from waste rice straw (cost = 380 to 560 ± 27 US$/Ton; n = 9) and applied as a protective approach against the formation of mineral scale deposits via adsorptive removal of Ba(II)/Sr(II) contaminants from 30,000 ppm saline wastewater. Adsorption of Ba(II)/Sr(II) ions onto biochar was investigated and optimized as a function of biochar amount, water pH, contact time, temperature, and Sr(II)/Ba(II) ratio using response surface methodology. Based on kinetic and isotherm analyses, the biochar exhibited enhanced potential to capture Sr(II)/Ba(II) ions via weak ion-exchange or pore-filling mechanisms (sorption energy (E)≈ 0.61–0.89 kJ/mol). A comparison of partition coefficient (PC) values verified that sorption of Sr(II) onto biochar is far superior to that of Ba(II) (PCs of 10.1 and 2.5 μmol g⁻¹ μM⁻¹, respectively). Sorption selectivity was mainly dependent on solution pH and the metallic properties of Ba(II)/Sr(II)(e.g., metal size, speciation, and mobility). Quantitative analysis of treated saline water using electrical conductivity and ion chromatography confirmed the ability of biochar sorbent to remove Ba(II) and Sr(II) ions (97.5%) with pre-desalination (e.g., salt reduction of 25.7% after 48 h). It is thus recommended to utilize the prepared biochar as a multifunctional alternative pre-desalinating ion-exchange medium to inhibit mineral scale formation via one-pot adsorption process before oilfield water flooding in the petroleum field and membrane desalination systems. Copyright © 2019 Published by Elsevier Ltd.
Original languageEnglish
Article number119442
JournalJournal of Cleaner Production
Volume250
Early online dateNov 2019
DOIs
Publication statusPublished - Mar 2020

Citation

Younis, S. A., El-Salamony, R. A., Tsang, Y. F., & Kim, K.-H. (2020). Use of rice straw-based biochar for batch sorption of barium/strontium from saline water: Protection against scale formation in petroleum/desalination industries. Journal of Cleaner Production, 250. Retrieved from https://doi.org/10.1016/j.jclepro.2019.119442

Keywords

  • Rice straw-derived biochar sorbent
  • Barium and strontium contaminants
  • Oilfield water purification
  • Sorption kinetics and isotherm
  • Response surface methodology
  • Pre-desalting

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