Chromium And Phosphorous Recovery
From Polluted Water By
Hydrothermal Mineralization
Author(s)
T. Itakura, H. Imaizumi, R. Sasai & H. Itoh
Abstract
Detoxification of polluted water containing chromium and phosphorous and its
resource recovery were investigated by hydrothermal mineralization using
Ca(OH)2 or CaCl2 mineralizers. Under the optimum treatment condition for
removing chromic acid (at 473 K, for 2 h using CaCl2 mineralizer in an in situ
sampling-type autoclave), CrVIO4
2- was recovered as CaCrO4 and the
concentration in the treated-water was 0.3 mg/L, which was lower than that of
the standard of discharged water in Japan. The phosphorous concentration in the
treated-water, which was obtained by the hydrothermal treatment at the optimum
treatment condition (at 473 K, for 12 h with Ca(OH)2 mineralizer by using the
same sampling-type autoclave), was 0.2 mg/L regardless of the ionic states.
Phosphorous compounds (PIIIO3
3-, PIO2
3-) were recovered as Ca(HPIIIO3)(H2O)
precipitate. This result indicates that mono-valent phosphinic acid (PIO2
3-) was
oxidized and simultaneously precipitated by the treatment. Therefore,
detoxification of the polluted water and resource recovery was accomplished by
the hydrothermal mineralization treatment.
Keywords: detoxification, resource recovery, hydrothermal mineralization,
chromium, phosphorous.
1 Introduction
Chromium and phosphorous are widely used as electroplating or metal finishing
reagents in modern industries as well as fertilizers, and a large amount of
wastewater containing these elements is discharged. The hexa-valent Cr in such
Keywords
detoxification, resource recovery, hydrothermal mineralization,
chromium, phosphorous.
Related Book
Other papers in this volume
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