Reactive bed filters for treatment of landfill leachate

• A laboratory experiment demonstrated the use of reactive bed filters to effectively remove metals and other elements from landfill leachate. Filter media composed of sand/peat, blast furnace slag (BFS)/peat and Polonite®/peat were tested by loading filter columns with leachate collected from a pond at Tveta Landfill, located in Södertalje, Sweden. Leachate was discharged to each column with a hydraulic loading rate of 1.34 m/d. Sand and Polonite® represent natural materials, although the latter is manufactured from the bedrock opoka. BFS is a by-product from steel-works. Polonite® provided the best removal capacity when compared to the other media. Mn, Fe, Zn and Cu were removed by 99%, 93%, 86% and 67% respectively. This filter media was also able to reduce phosphorus by 90% and nitrogen by l8%.The BFS showed good removal efficiency for Cu (66%), Ni (19%) and Mo (16%). Reactive bed filters may be an economical and practical method for augmenting current, and future onsite treatment of landfill leachate disposal systems with metal, phosphorus and nitrogen removal capabilities.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering (hsv//eng)

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