Industrial wastewater (API/DAF)

Industrial Wastewater Treatment – Efficient Removal of Oil, Solids, and Contaminants

Industrial wastewater often contains high concentrations of hazardous chemicals, oils, suspended solids (SS), heavy metals, COD, BOD, total nitrogen (T-N), total phosphorus (T-P), and pH irregularities. If untreated, this wastewater poses serious threats to human health, ecosystems, and compliance with discharge regulations.

To ensure safe disposal or reuse, advanced treatment processes must be applied to remove oil, suspended solids, nutrients, and organic pollutants effectively.

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 Primary Treatment: API Oil-Water Separator

The API oil-water separator is a gravity-based separation system designed using Stokes’ Law. It separates oil, water, and solids based on differences in specific gravity:

• Oil rises to the top of the separator

• Suspended solids settle at the bottom as sludge

• Treated water remains in the middle layer

This step significantly reduces free-floating oil and large solid particles, preparing the wastewater for further polishing.

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 Secondary Treatment: Dissolved Air Flotation (DAF)

The DAF system is a highly effective clarification process that removes emulsified oil, fine solids, and colloidal particles by injecting microbubbles of air into the water under pressure. When released at atmospheric pressure, these air bubbles attach to contaminants and lift them to the surface for easy removal.

Benefits of DAF include:

• High removal efficiency for TSS, oil, grease, and BOD

• Ideal for industries with fluctuating loads

• Compact footprint and modular design

• Enhances sludge thickening

Together with the API separator, DAF forms a robust two-stage pre-treatment solution for industrial wastewater.

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 Advantages of Non-Metallic Equipment in Wastewater Systems

Non-metallic materials (such as reinforced plastic, FRP, or polymer composites) offer major operational and cost advantages in corrosive and abrasive environments:

• High strength and impact resistance

• Corrosion-resistant to aggressive chemicals and salty water

• Extremely lightweight, simplifying transport and installation

• Energy-efficient – up to 80% less energy usage compared to metal components

• Very low maintenance costs

• 10x longer service life than traditional metallic equipment

• Silent operation with no vibration

• Non-metallic collectors resist chemical attack and simplify oil recovery and sludge handling

• Perform well under variable flow and contaminant load

These properties make non-metallic materials ideal for long-term use in industrial effluent treatment plants.

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 Industrial Applications

Industrial wastewater treatment solutions are widely used in:

• Oil and gas refineries

• Chemical and petrochemical plants

• Metal processing industries

• Food and beverage manufacturing

• Textile and dyeing facilities

• Pharmaceutical production

Meeting local environmental regulations and zero-discharge targets requires integrated, efficient systems like API + DAF, combined with smart material choices.

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Effective industrial wastewater treatment requires the removal of hazardous pollutants such as oil, solids, COD, BOD, nitrogen, and phosphorus. Combining API separators and DAF units ensures a high level of purification, while non-metallic equipment delivers enhanced durability, efficiency, and cost-effectiveness.

Whether you’re looking to meet strict discharge standards or aiming for sustainable reuse of treated water, advanced wastewater treatment technologies can deliver safe, compliant, and environmentally responsible outcomes.