Anaerobic Treatment of Landfill Leachate by an Upflow Two-Stage Biological Filter,

Abstract : The advantages inherent in anaerobic submerged filter system coupled with the amenability of this process in its application to leachate stabilization suggests that it is worthy of consideration as a basis for full scale leachate treatment facilities. The AnSBF is well suited to handling the large organic loads that often characterize leachates, particularly leachates that are discharged from young landfills. More than 96% COD and BOD can be removed from a high-strength acidic leachate waste-water, according to the present study, if the organic loading is controlled not in excess of 75.2 lb COD/1000 cu ft -day or 56.4. Metal removal efficiency is high when the influent concentrations of Fe(III) and Zn(II) are less than 115.3 mg/1 and 10.4 mg/1, respectively. In addition to the efficient treatment of soluble COD, BOD, and heavy metals, the anaerobic filter requires no effluent recycle or sludge return.