Application of Dbaf technique for tannery industry wastewater treatment

Abstract

With the interest in environmental protection the interest in industrial wastewater treatment had increased especially with enlargement in industry and the increase of the treatment cost that affect the products prices. This study aimed to investigate the suitability of applying the Dual Biological Aerated Filter (DBAF) as new low cost technique system for biological treatment preceded by a chemical precipitation to treat industrial wastewater of tannery industry. This new technology decreases construction costs, O&M costs and safe land required with high efficiency. The research made on a plant erected in Shahien tannery in Alexandria operated for five months. Where studied the factors affect the plant efficiency under all operation conditions due to operation program, chemicals used, rates and the effects on plant loads to obtain its suitability for such type of wastewater. The study proved the applicability of the system for such wastewater. The removal ratios for BOD, COD & Cr were 88.05%, 85.5%, 98.85% respectively. Which are high values for treatment efficiency of such type of wastewater and a good efficiency for TSS removal achieved. Also the system did not affected by sudden variations in loads or the non uniformity in tannery operation. The economic comparison with other treatments previously used approved the economy of this system.