Manganese removal from water using limestone-filled tanks

✍ Scribed by Frank C. Thornton

• Book ID: 103963501
• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 380 KB
• Volume: 4
• Category: Article
• ISSN: 0925-8574
• DOI: 10.1016/0925-8574(94)00003-n

✦ Synopsis

A pilot-scale water treatment system, consisting of two limestone-filled tanks followed by a vegetation cell, was constructed to treat drainage water from a coal-ash disposal pond located at a coal-fired fossil plant in Alabama, USA. Inflow water manganese concentration averaged 3.5 mg 1-1 (ranging from 0.02 to 5.98 mg 1-l) over the 495-day treatment period. The system worked effectively in removing Mn, producing water which averaged 0.49 mg i-~, or an 88% removal efficiency. A black film coated the rocks in the limestone tanks and was assumed to be the chief site of Mn removal via microbial oxidation. This film contained up to 140 g Mn kg -1, with an average concentration of 61.4 g Mn kg -1. The results of this study demonstrate an ecotechnological means to treat water that is high in Mn, provided the water does not have high Fe concentrations that would coat rock surfaces.