Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters

Masahito Tanaka, Tsuyoshi Hirajima, Keiko Sasaki, Naoko Okibe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Arsenic (As) is a major impurity contaminating metal refinery wastewaters. To immobilize As ions, we have previously reported microbial scorodite (FeAsO4·2H2O) crystallization using the thermo-acidophilic iron-oxidizing archaeon, Acidianus brierleyi. In order to extend the applicable range of As(III)-bearing metal refinery wastewaters (especially for dilute As(III) concentrations of 250–1500 ppm), this study investigated the effect of several factors possibly affecting the bioscorodite crystallization efficiency; (i) [Fe(II)]ini/[As(III)]ini molar ratio at different target As(III) concentrations, (ii) initial pH, and (iii) seed scorodite with different morphologies. The [Fe(II)]ini/[As(III)]ini molar ratio strongly affected the bioscorodite crystallization efficiency at each target As(III) concentration. Whilst the [Fe(II)]ini/[As(III)]ini molar ratio of 1.4 was most effective at 500–1500 ppm As(III), the optimal molar ratios for treating more dilute concentrations (< 500 ppm) were shown to be relatively higher. However, further increasing the [Fe(II)]ini/[As(III)]ini molar ratio resulted in formation of unwanted potassium jarosite (KFe3(OH)6(SO4)2) together with scorodite. Lowering the initial pH from 1.5 to 1.2 resulted in earlier scorodite nucleation, but lower overall As immobilization. Feeding chemical- and bio-scorodite seed crystals differently affected the reaction speed and the stability of newly-precipitated bioscorodite. The TCLP test indicated that scorodite formed on bioscorodite seeds is more stable than that formed on chemically-synthesized scorodite seeds.

Original languageEnglish
Title of host publication22nd International Biohydrometallurgy Symposium
PublisherTrans Tech Publications Ltd
Pages555-558
Number of pages4
ISBN (Print)9783035711806
DOIs
Publication statusPublished - Jan 1 2017
Event22nd International Biohydrometallurgy Symposium, 2017 - Freiberg, Germany
Duration: Sep 24 2017Sep 27 2017

Publication series

NameSolid State Phenomena
Volume262 SSP
ISSN (Electronic)1662-9779

Other

Other22nd International Biohydrometallurgy Symposium, 2017
CountryGermany
CityFreiberg
Period9/24/179/27/17

Fingerprint

Bearings (structural)
Arsenic
Crystallization
arsenic
Wastewater
crystallization
optimization
seeds
Metal refineries
Seed
scorodite
immobilization

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Tanaka, M., Hirajima, T., Sasaki, K., & Okibe, N. (2017). Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters. In 22nd International Biohydrometallurgy Symposium (pp. 555-558). (Solid State Phenomena; Vol. 262 SSP). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/SSP.262.555

Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters. / Tanaka, Masahito; Hirajima, Tsuyoshi; Sasaki, Keiko; Okibe, Naoko.

22nd International Biohydrometallurgy Symposium. Trans Tech Publications Ltd, 2017. p. 555-558 (Solid State Phenomena; Vol. 262 SSP).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tanaka, M, Hirajima, T, Sasaki, K & Okibe, N 2017, Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters. in 22nd International Biohydrometallurgy Symposium. Solid State Phenomena, vol. 262 SSP, Trans Tech Publications Ltd, pp. 555-558, 22nd International Biohydrometallurgy Symposium, 2017, Freiberg, Germany, 9/24/17. https://doi.org/10.4028/www.scientific.net/SSP.262.555
Tanaka M, Hirajima T, Sasaki K, Okibe N. Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters. In 22nd International Biohydrometallurgy Symposium. Trans Tech Publications Ltd. 2017. p. 555-558. (Solid State Phenomena). https://doi.org/10.4028/www.scientific.net/SSP.262.555
Tanaka, Masahito ; Hirajima, Tsuyoshi ; Sasaki, Keiko ; Okibe, Naoko. / Optimization of bioscorodite crystallization for treatment of as(III)-bearing wastewaters. 22nd International Biohydrometallurgy Symposium. Trans Tech Publications Ltd, 2017. pp. 555-558 (Solid State Phenomena).
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