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ENVE 420 Industrial Pollution Control

ENVE 420 Industrial Pollution Control. Wastewater Treatment Processes Dr. Aslıhan Kerç. Primary – Secondary Treatment. Primary and secondary treatment handle non-toxic wastewaters. If ww contain s toxic compounds, they have to be pretreated before these processes. Primary Treatment.

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ENVE 420 Industrial Pollution Control

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  1. ENVE 420IndustrialPollutionControl Wastewater Treatment Processes Dr. Aslıhan Kerç

  2. Primary – Secondary Treatment • Primary and secondary treatment handle non-toxic wastewaters. • If ww contains toxic compounds, they have to be pretreated before these processes.

  3. Primary Treatment • Preparation of wastewater for biological treatment • Removal of large solids by screening, grit removal • Equalization: Levels out the hour to hour variations in flows and concentrations. • Spill Pond: Retain slugs of concentrated wastes that could upset the downstream processes.

  4. Primary Treatment • Neutralization: Follows equalization. Streams of different pH neutralize each other • Oil and grease, SS removal by flotation, sedimentation or filtration

  5. Secondary Treatment • Biological degredation of soluble organic compounds Biotreatment: - Aerobic - Anaerobic

  6. In-plant Treatment • Necessary for biological treatment. • Heavy metals, pesticides pass through primary treatment and inhibit biological treatment. • Effective for low volume streams with high concentration of non-degredable materials. • Easier to treat a specific pollutant from a small and concentrated stream than a large dilute stream.

  7. In-plant Treatment • Precipitation • Activated carbon adsorption • Chemical oxidation • Air or stream stripping • Ion exchange • Reverse osmosis • Electrodialysis • Wet air oxidation

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