Table of Contents
Biological Treatment Process
Effluent treatment plant are used to treat waste water that comes from different manufacturing industries where different types of chemicals and dyes are used to treat the materials. After treatment, waste water is directly discharged into the environment. This waste water is harmful to the environment. The purpose of biological treatment of wastewater is to protect the environment from the harmful effects of waste water, an effluent treatment plant is used where waste water is treated and is not harmful to the environment.
In the textile industry, different types of dyes and chemicals are used in weaving, dyeing and garment washing plants. This waste water is treated at an effluent treatment plant. Here I will give an idea of the biological waste water treatment plant. In the dyeing process, waste water is discharged from scouring, bleaching, washing, and dyeing. These dyes and chemicals are supplied to the biological water treatment plant for purification.
In Bangladesh, a lot of dyeing and textile industries have been established for processing textile products. To protect the environment from the harmful effects of the waste water, the Department of Environment, Government of Bangladesh, fixed the following parameters for the waste water that will be discharged into the environment after treatment:
- PH : 6-9
- BOD: 50 mg/L
- COD: 200 mg/L
- Suspended solid: 150 mg/L
- Color: light brownish.
The waste water that is produced in the dyeing industry may have the following characteristics:
- PH: 9-11
- BOD: 300 mg/l
- COD: 200 mg/l
- Suspended solid: 200 mg/l
- Color: Dark
Flow Chart of Biological Treatment of Wastewater In Textile Industry
After treatment, the characteristics of the waste water changed as follows
- PH: 7-8
- BOD: 30 mg/ L
- COD: 60 mg / L
- Suspended solid: 30mg/L
- Color: Light brownish
Process flow chart of biological wastewater treatment plant:
Effluent comes in collection tank
Equalization tank (Cooling & Mixing)
Primary clarifier tank (Neutralization)
Secondary clarifier (Tank 1 & 2)
Sludge return to aeration tank
So, that’s all about the biological treatment of industrial wastewater. If you have better idea lets me know about it.