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Comprehensive Guide to Wastewater Treatment Processes by Dr. Aslıhan Kerç

This document outlines the primary and secondary wastewater treatment processes essential for managing non-toxic wastewaters. Primary treatment involves the preparation of wastewater through screening, grit removal, equalization, and neutralization. Secondary treatment focuses on the biological degradation of soluble organic compounds via aerobic and anaerobic methods. Additionally, it discusses the necessity of in-plant treatments for removing contaminants such as heavy metals and pesticides and provides an overview of advanced techniques including chemical oxidation and reverse osmosis.

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Comprehensive Guide to Wastewater Treatment Processes by Dr. Aslıhan Kerç

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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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