Resource Recovery From Wastewater
Containing Hazardous Oxoanions
By Hydrothermal Mineralization
Author(s)
T. Itakura, R. Sasai & H. Itoh
Abstract
We developed a new treatment method for wastewater containing various
harmful ions such as arsenite, arsenate, boric, fluoride and fluoroboric ions by
hydrothermal mineralization using Ca(OH)2 as a mineralizer. As a result,
complete recovery of these ions was attained regardless of the initial
concentration and oxidation number of these harmful ion species in wastewater.
Therefore, the present hydrothermal treatment using Ca(OH)2 mineralizer is
recommended as one of the most effective techniques to remove these ions from
wastewater and recover them as recyclable resource.
Keywords: hydrothermal mineralization, arsenite, arsenate, recovery.
1 Introduction
Various oxoanions such as arsenite and boric acid have high toxicity against
human health and the environment. They are important resource, however, for
plating or advanced material manufacturing industries, from which the
wastewater containing these oxoanions is generated everyday. Several methods
to remove them have been already reported by using adsorption, electrocoagulation,
membrane and biological techniques [1–5]. But, these methods
have the following problems. (1) Removal yield is low. (2) The applicable
concentration range is narrow. In addition, used adsorbent or collected residues
are still hazardous wastes, so that they must be treated by proper method, though
it is very difficult to convert them to recyclable resource in various industries.
These problems are caused by the difficulty to recover these oxoanions as stable
Keywords
hydrothermal mineralization, arsenite, arsenate, recovery.
Related Book
Other papers in this volume
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