Oxidation ditches are an advanced activated sludge technology with high treatment efficiency, especially for parameters such as COD, BOD, and TN. With a simple structure, low operating costs, and easy maintenance, this technology is suitable for various types of wastewater, including residential, urban, and industrial wastewater.
Oxidation ditch
Typical applications
Effectively applicable to various types of wastewater.
- Rubber wastewater
- Livestock wastewater
- Dairy and food processing wastewater
- High-flow domestic wastewater
- Wastewater with high and fluctuating COD/BOD/TN concentrations
Operating principle
Overview
Oxidation ditches operate based on an activated sludge process in a closed-loop recirculation system, combined with surface aeration equipment that both provides oxygen and creates a continuous flow. During recirculation, wastewater passes through areas with different oxygen concentrations: aerobic and anaerobic. This natural oxygen distribution allows for the simultaneous occurrence of two biological processes:
- Aerobic: microorganisms decompose organic matter and convert ammonia (NH₄⁺) into nitrate (NO₃⁻);
- Anaerobic: a portion of the nitrate is converted into nitrogen gas (N₂).
Thanks to the combination of these two zones in the same tank, the oxidation ditch simultaneously treats BOD/COD, nitrifies, and denitrifies without the need for multiple separate tanks. Water from the oxidation ditch returns to the settling tank for sludge separation; the sludge in the settling tank is recirculated back to the ditch, ensuring stable operation.
Advantage
High TN processing efficiency (80–95%)
Easy to operate – requires few complex technical skills.
High shock load capacity
Simple maintenance – low cost
Flexible operation, suitable for systems with fluctuating flow rates.
Long lifespan of the structure
Why choose GR INDTECH?
Over 16 years of experience in implementing wastewater treatment systems in Vietnam.
Specializing in design, EPC, and operation of oxidation ditch technology.
Designing improved versions of oxidation ditches to suit each project.
Optimize operating costs and save energy.
A team of engineers specializing in microbiology and processes.
24/7 Maintenance and Technical Support Services
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