AO Wastewater Treatment System for Municipal & Industrial Wastewater Treatment

The AO Wastewater Treatment System developed by Qingdao Linzhen Environment Project Co., Ltd. is a highly efficient biological wastewater treatment solution designed for the removal of organic pollutants, ammonia nitrogen, and suspended solids from municipal and industrial wastewater. Combining Anoxic (A) and Oxic (O) biological treatment stages, the system achieves stable nitrogen removal while maintaining low operating costs and high treatment efficiency.

With years of experience in environmental engineering, Linzhen provides customized wastewater treatment equipment for EPC contractors, environmental engineering companies, municipal projects, industrial manufacturers, and water treatment solution providers worldwide. Our systems have been successfully exported to more than 50 countries across Asia, Europe, Africa, South America, and Oceania, supported by overseas branches, warehouses, and technical service teams.

What is an AO System?

An AO (Anoxic -Oxic) wastewater treatment system is a biological wastewater treatment process designed to remove organic pollutants and nitrogen compounds from wastewater. The systemcombines an anoxic tank and an aerobic tank, allowing microorganisms to efficiently degradeorganic matter while converting ammonia into harmless nitrogen gas.

Compared with conventional activated sludge systems, the AO process offers better nitrogenremoval efficiency, lower operating costs, and stable treatment performance. It is widely used in municipal sewage treatment plants as well as industrial wastewater treatment projects.

The AO Wastewater Treatment System Works

Equalization

Balances flow and pollutant concentration.

Anoxic Tank

Denitrification converts nitrate into nitrogen gas.

Aerobic Tank

Organic pollutants are decomposed while ammonia is oxidized into nitrate.

Clarifier

Separates activated sludge from treated water.

Disinfection

Ensures treated water meets discharge or reuse standards.

Key Features of the AO Wastewater Treatment System

Excellent Nitrogen Removal Performance

The integrated anoxic and aerobic biological process provides efficient nitrification and denitrification, significantly reducing ammonia nitrogen and total nitrogen concentrations.

High COD & BOD Removal Efficiency

The biological treatment process effectively removes biodegradable organic pollutants, achieving excellent COD and BOD reduction suitable for strict discharge regulations.

Flexible Process Configuration

According to wastewater characteristics and project requirements, the AO process can be combined with:

• Dissolved Air Flotation (DAF)
• MBBR Technology
• MBR Membrane Technology
• SBR Process
• Tube Settler
• Sludge Dewatering Equipment

This flexibility allows optimized treatment performance for different industries.

PLC Intelligent Control System

The automatic PLC control system continuously monitors operating parameters and supports both automatic and manual operation, reducing labor costs while improving operational reliability.

Durable Construction Materials

The equipment can be manufactured using:

• Carbon Steel with Anti-corrosion Coating
• Stainless Steel 304
• Stainless Steel 316

Material selection can be customized based on wastewater characteristics and installation environments.

Compact Modular Design

The packaged structure minimizes installation space, simplifies transportation, and significantly shortens on-site construction time.

Specification

Applications

The AO Wastewater Treatment System is widely used for municipal and industrial wastewater treatment. With its efficient biological treatment process and reliable nitrogen removal performance, it can be customized to meet the specific wastewater characteristics and discharge standards of various industries.

● Municipal Sewage – Domestic sewage treatment for cities, towns, and public infrastructure. 
● Food Processing – Treatment of high-organic wastewater generated by food and beverage manufacturing. 
● Dairy Wastewater – Efficient removal of COD, BOD, and suspended solids from dairy production facilities. 
● Slaughterhouse – Treatment of wastewater containing blood, fats, proteins, and organic pollutants. 
● Textile Industry – Suitable for dyeing and textile wastewater with varying pollutant concentrations. 
● Chemical Industry – Biological treatment for chemical manufacturing wastewater with customized process design. 
● Brewery – Effective treatment of brewery and beverage production wastewater with high biodegradable organic content. 
● Palm Oil Mill – Reliable treatment solution for palm oil mill effluent (POME) with high organic loading.

Why Choose Qingdao Linzhen Environment Project Co., Ltd.?

As a professional manufacturer of wastewater treatment equipment, Qingdao Linzhen Environment Project Co., Ltd. integrates equipment manufacturing, process engineering, system design, and technical services into one complete solution.

Professional Manufacturing Base

• 30,000 m² manufacturing facility
• 12,000 m² production workshop
• Professional environmental equipment production line
• Strict quality management system

Experienced Engineering Team

With a dedicated R&D department and experienced wastewater treatment engineers, Linzhen provides customized process design based on wastewater characteristics, discharge standards, and project budgets.

Global Project Experience

Our equipment has been exported to more than 50 countries, serving municipal authorities, industrial enterprises, EPC contractors, and environmental engineering companies worldwide.

Overseas Service Network

To provide faster technical support, Linzhen has established:

• Malaysia Branch
• Philippines Branch
• Overseas warehouses
• Overseas showrooms
• International service centers

This global network enables timely after-sales service, spare parts supply, commissioning support, and technical consultation.

One-Stop Wastewater Treatment Solutions

In addition to AO wastewater treatment systems, Linzhen also manufactures:

• Integrated Sewage Treatment Plants
• Industrial Wastewater Treatment Systems
• Containerized Sewage Treatment Plants
• Dissolved Air Flotation (DAF) Units
• Lamella Clarifiers (Tube Settlers)
• Sludge Dewatering Equipment
• Screw Press Sludge Dewatering Machines
• Complete Wastewater Treatment Plants