DESIGN A TERTIARY WATER TREATMENT PLANT IN A TANNERY

Abstract

Advance Oxidation processes (AOPs) are advanced water treatment techniques that utilize highly reactive oxidizing agents to remove or degrade organic and inorganic pollutants in water. Electro-Fenton is one of them. These processes involve the generation of hydroxyl radicals (·OH), which are powerful oxidants capable of breaking down a wide range of contaminants. Hydrogen peroxide (H2O2) is used as a standalone oxidant or in combination with other processes to produce ·OH radicals. The reaction between H2O2 and a catalyst (such as iron, titanium dioxide, or ultraviolet light) generates ·OH radicals that can degrade contaminants. Siddique Leather works have daily water capacity of 1500 m3/d. The industry installed a secondary treatment process for chrome recovery and biological treatment for sludge. The objective of our project is to reduce COD or BOD to desired amount (i.e., COD to 150 mg/L or BOD to 100mg/L) and to meet specification of fresh water extracted from bore holes. The implemented technique gives 88% recovery of water and almost all the persistent organics are removed while following NEQ’s standards.