Treatability of manganese by sodium silicate and chlorine

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Journal of the American Water Works Association; (USA)

OSTI ID:6831165

Robinson, F B; Ronk, S K ^[1]

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1. Tennessee Univ., Knoxville (USA)

Manganese sequestering by nearly simultaneous additions of sodium silicate and sodium hypochlorite was studied in laboratory-prepared waters. Under conditions of near-neutral pH and 150-250 mg/liter of alkalinity as CaCO{sub 3}, 1-2 mg manganese/liter could be sequestered for up to one day. Less effective manganese treatability was found at pH 8 than at pH 7. Additionally, at pH 7 the best results were obtained when neither silicate nor hypochlorite was added because of the slow manganese oxidation rate by oxygen alone. Aging of diluted stock silicate solutions prior to dosing also resulted in poor treatment; the presence of background silica increased the treatment effectiveness only slightly. Overall, manganese was less treatable by this method than iron under the same treatment conditions.

• OSTI ID: 6831165
• Journal Information: Journal of the American Water Works Association; (USA), Journal Name: Journal of the American Water Works Association; (USA) Vol. 79:11; ISSN JAWWA; ISSN 0003-150X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ALKALI METAL COMPOUNDS
ELEMENTS
MANGANESE
METALS
OXYGEN COMPOUNDS
PH VALUE
POLLUTION
REMOVAL
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SODIUM SILICATES
TRANSITION ELEMENTS
WATER POLLUTION
WATER TREATMENT