Treatment of municipal solid wastes leachate by means of chemical- and electro-coagulation

In this study, treatment of municipal solid waste leachate (L1, L2) by means of chemical- and electro-coagulation (EC) methods was investigated. The removal of chemical oxygen demand (COD), total organic carbons (TOC) and color from leachate was experimentally investigated by using chemical- and electro-coagulation. Aluminum and iron were used simultaneously in the reactor as materials for electrodes. Percent of COD, TOC and color removal versus the electro-chemically generated Fe(2+) and Al(3+) doses are examined in this study. The best removal has been achieved in the COD parameter. Thus, in electro-coagulation method, the maximal removal is 87% for the L1 solution, while for L2 it is 90% for Fe(2+) and 77% for L1 and 88% for L2 for Al(3+) ion solutions. High color removal for Fe,21 is observed for L1 (86%), while for L2 it is approximately 99%. The removal indices for the leachate treatment by chemical coagulants (FeSO(4)center dot 7H(2)O and Al(2)(SO(4))(3)center dot 18H(2)O) appeared to be lower than for the electrochemically generated Fe(2+) and Al(3+). The results show that electro-coagulation could be considered as an effective alternative solution for the treatment of leachate. (C) 2007 Elsevier B.V. All rights reserved.