Sludge Recycle and Reuse in Acid Mine Drainage Treatment

Neutralization of acid mine drainage produces vast quantities of iron-rich sludge, and large quantities of unused lime remain in the sludge after treatment. In a study in which sludge was recycled to increase lime utilization, sludge was mixed with raw acid mine drainage and settled out in an interm...

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Bibliographic Details
Published in:Journal - Water Pollution Control Federation 1983-01, Vol.55 (3), p.278-284
Main Authors: Keefer, Gary B., Sack, William A.
Format: Article
Language:English
Subjects:
Acid mine drainage
Acidity
Coagulants
Iron
Process Research
Recycling
Sludge
Sludge treatment
Sulfates
Wastewater treatment
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Summary:Neutralization of acid mine drainage produces vast quantities of iron-rich sludge, and large quantities of unused lime remain in the sludge after treatment. In a study in which sludge was recycled to increase lime utilization, sludge was mixed with raw acid mine drainage and settled out in an intermediate clarifier. The clarifier supernatant was then treated by lime addition, aeration, and sedimentation. The low-pH sludge was withdrawn from the intermediate clarifier. The iron was recovered by acidification and used as a wastewater coagulant. The recycle scheme resulted in a 30% decrease in lime requirements, and the resultant coagulant performed well when compared with stock iron coagulant solutions.
ISSN:0043-1303