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Batch-Mixed Iron Treatment of High Arsenic Waters
Wat. Res. Vol. 35, No. 18, pp. 4474–4479, 2001
r 2001 Elsevier Science Ltd. All rights reserved
Printed in Great Britain
0043-1354/01/$ - see front matterPII: S0043-1354(01)00168-3
RESEARCH NOTE
BATCH-MIXED IRON TREATMENT OF HIGH ARSENIC
WATERS
ANURADHA RAMASWAMI*, SANTHITI TAWACHSUPA and MEHMET ISLEYEN
Department of Civil Engineering, University of Colorado, Denver, CO 80217, USA
(First received 1 May 2000; accepted in revised form 1 March 2001)
AbstractFThis paper develops batch-mixed treatment with zero-valent iron as a point-of-use technology,
appropriate for arsenic removal from water stored within rural homes in Bangladesh and West Bengal,
India, where arsenic poisoning has affected an estimated 20 million people. Batch tests with iron yielded
the following results: (1) High arsenic removal (93%) was achieved from highly arsenated waters
(2000mg/L) over short contact times (0.5–3 h) with iron filings added at doses ranging from 2500 to
625mg/L; (2) Most rapid arsenic removal was observed in head-space free systems with sulphates present
in solution, while phosphate buffers were observed to inhibit arsenic removal by iron; (3) The arsenic
removed from water was found to be strongly bound to the elemental iron filings, such that the treated
water could be decanted and iron could be reused at least 100 times; (4) Some iron dissolved into water
over the contact period, at concentrations ranging from 100 to 300mg/L, which are within safe drinking
water limits. These results indicate that, with appropriate assessment of water chemistry in the affected
region, treatment with metallic iron followed by simple decantation can be used as a practical, in-home,
point-of-use technique for reducing human exposure to arsenic in drinking water. r 2001 Elsevier Science
Ltd. All rights reserved
Key wordsFarsenic, zero-valent iron, point-of-use technology
INTRODUCTION
Arsenic poisoning of drinking water has created a
devastating health crisis affecting much of the rural
Banglades
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