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Process Sequence of Biological ETP

Emdadul Haq 
Lecturer, Department of Textile Engineering, Primeasia University; Bangladesh 

Effluent Treatment Plant or ETP is one type of waste water treatment method which is particularly designed to purify industrial waste water for its reuse and it’s aim is to release safe water to environment from the harmful effect caused by the effluent. Industrial effluents contain various materials, depending on the industry. Some effluents contain oils and grease, and some contain toxic materials (e.g., cyanide). Effluents from food and beverage factories contain degradable organic pollutants. Since industrial waste water contains a diversity of impurities and therefore specific treatment technology called ETP is required. The ETP Plant works at various levels and involves various physical, chemical, biological and membrane processes to treat waste water from different industrial sectors like chemicals, drugs, pharmaceutical, refineries, dairy, ready mix plants & textile etc.

Biological Effluent Treatment Plants


Process Sequence of Effluent Treatment Plant:

Equalisation Tank
Storage & Homogeneous Tank
Neutralisation Tank: Sulphuric Acid Dosing Area
Distributor/ Biological Feeding Tank
Biological Oxidise Tank
Water Decolorant Dosing Tank
Sedimentation Tank
Excess Sludge Thickener Tank
Sludge Return Tank
Main Outlet Tank: Treated Water
Sludge De-watering
Polymer Mixing Tank
Dry Sludge Tank

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