Industrial Effluent Treatment by Aeration and Filtration (Multimedia Filter)

Abstract

Tannery industries produces large amount of wastewater containing huge amount of pollutants that doesn’t satisfies the standard values of ECR. It should be treated before contaminating river water. This study focuses on treating tannery wastewater without using any chemical products. The Study aimed to reach Bangladesh guideline levels for industrial wastewater of which were pH(6-9),TS (2200mg/L), EC(1200 micro siemens per centimeter), DO (6mg/l), At first aeration and sedimentation was done of the wastewater for various retention times like 1 hour, 2 hours, 3 hours and so on. After completing aeration and sedimentation finally filtration was done using a multimedia filter which contains five layers of filter materials. These filter materials can reduce turbidity, color, total suspended solids etc. The main aim of this project is reducing the chemical oxygen demand (COD) value. These three steps process (aeration + sedimentation + filtration) resulted in 80-90% reduction in COD. Pollutant removal efficiency was measured in terms of total dissolved solids, total suspended solids, color, turbidity and COD. Dissolved oxygen level of the wastewater was increased due to aeration. Most values were found to achieve standard values.