Electrochemical treatment of wastewater from a phosphoric acid manufacturing plant.
Phosphoric acid plant wastewater containing fluoride, phosphate and chemical oxygen demand etc., was treated using electrooxidation and electroflocculation methods. A maximum of 82% F- and 22.7% COD were removed using Ti/Pt(5c) under electrooxidative conditions. Electrooxidation with respect to F- removal is found mass-transfer limited, and removals below 5-6 mg/L F- are not achievable. Electroflocculation using Al anode resulted in better removal of F-, COD and PO4(3-). The various results obtained are discussed in this paper.
Neti
Nageswara Rao
NR
National Environmental Engineering Research Institute, Nehru Marg, Nagpur--440020, India. wwtdiv@nagpur.dot.net.in
Kaul
Santosh Narain
SN
D002617:Chemical Industry; D004563:Electrochemistry; D005427:Flocculation; D005459:Fluorides / Q000737:chemistry / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry / Q000302:isolation & purification; D010756:Phosphoric Acids; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D010710:Phosphates; D010756:Phosphoric Acids; C030242:phosphoric acid; D005459:Fluorides; D010100:Oxygen