Abstract

The efficiency of COD and color removal from raw coffee processing wastewater (CPWW) using batch electrochemical coagulation (BECC) treatment process using stainless steel (SS) and iron (Fe) electrode combinations are investigated. Of the combinations 4 SS, 4 Fe, Fe-Fe-SS-SS, Fe-SS-Fe-SS, SS-SS-Fe-Fe, and SS-Fe-SS-Fe; 4 SS electrodes operated at 23 V having 120 A/m2 CD was found as a good operating condition to achieve ∼87% COD removal from its COD0 of 3,012 mg/L and corresponding color removal of 97.1% (Color0 7,000 PCU). The second best electrode combination SS-SS-Fe-Fe portrayed COD and color removals of 75% and 91%. When using PAC as aid with different dosages of 20–100 mg/L, 50 mg/L PAC showed maximum COD and color removals of 80% and 92%. Comparison of proximate and ultimate analyses of various solid fuels with CPWW ECC sludge showed usefulness as soil supplement and as adsorbent for reutilization. The solid residues obtained after BECC was characterized using EDS and other characteristics. Summarizing over the results, it was concluded that BECC can be effectively used for maximum removal of organics from raw CPWW with clean water reclamations up to ∼90% using ECC as a novel treatment technique.

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