Wastewater Secondary Treatment – MBR, MBBR, AO & AAO

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Home Systems Wastewater TreatmentSecondary Treatment

Secondary Treatment

Wastewater Treatment

Secondary Treatment

01. Secondary Treatment
- MBR System

Versatile & Effective Wastewater Secondary Treatment

Secondary treatment is a crucial phase in wastewater treatment, using biological processes to effectively remove dissolved organic matter. By utilizing microbial metabolism, organic pollutants are degraded into harmless substances such as carbon dioxide and water, ensuring that treated wastewater meets environmental standards. This stage is vital for water quality improvement, environmental protection, and sustainable water resource utilization.

Position and Importance in Wastewater Treatment

In the overall wastewater treatment process, secondary treatment lies between primary and tertiary treatments. Primary treatment primarily removes suspended solids and large particulate pollutants, while secondary treatment further degrades dissolved organic matter, making it the core step in enhancing water quality. Secondary treatment significantly reduces biochemical oxygen demand (BOD) and chemical oxygen demand (COD) in wastewater, providing a solid foundation for tertiary treatment to remove remaining pollutants. In this system, almost of the pollutes are removed and it can even achieve the discharge standard or reclaimed standard.

Contains

An AO system flow chart of wastewater treatment.

AO (Anaerobic-Oxic Process) System

The AO process alternates between anaerobic and aerobic environments to treat wastewater, effectively removing organic matter and ammonia nitrogen. In the anaerobic zone, organic matter is decomposed by microorganisms into smaller molecules; in the aerobic zone, ammonia nitrogen is nitrified into nitrate and nitrite.

An AAO system flow chart of wastewater treatment.

AAO (Anaerobic-Anoxic-Oxic Process) System

The AAO process adds an anoxic stage to the AO process, effectively removing organic matter, ammonia nitrogen, and total nitrogen. In the anoxic stage, denitrification reduces nitrate and nitrite to nitrogen gas, further enhancing nitrogen removal efficiency.

A MBR system flow chart of wastewater treatment.

MBR (Membrane Bioreactor) System

Membrane Bioreactor is an efficient treatment process that combines membrane separation technology with biological treatment. Membrane modules separate activated sludge from treated water, ensuring excellent effluent quality, suitable for high-standard wastewater treatment requirements.

A MBBR system flow chart of wastewater treatment.

MBBR (Moving Bed Biofilm Reactor) System

Moving Bed Biofilm Reactor enhances treatment efficiency by adding carriers in the reactor where microorganisms attach and form biofilms. MBBR combines the advantages of activated sludge and biofilm processes, suitable for high-load wastewater treatment.

Substances Removed

Organic Pollutants

Including dissolved organic matter and some suspended organic matter.
Ammonia Nitrogen

Converted to harmless nitrogen gas through nitrification and denitrification.
Suspended Solids

Partially removed through microbial metabolism and sedimentation.
Pathogenic Microorganisms

Reduced through biological degradation and adsorption.

Advantages

Various Options. MBR, MBBR, AO, AAO and other systems can be selected according to your project conditions and environments.
Efficient Organic Matter Removal. Significantly reduces BOD and COD in wastewater.
High Adaptability. Capable of treating various types and concentrations of organic pollutants.
Environmental Protection. Reduces environmental pollution, protects water resources.

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