AO-MBR Process

• Product Overview

The integrated wastewater treatment system is a modular solution developed by our company, combining multiple biological treatment processes into a portable unit. Featuring standardized design, factory prefabrication, and rapid on-site assembly, it provides an efficient, space-saving, and highly automated solution for treating domestic sewage, rural wastewater, and similar organic effluents. To meet diverse discharge standards and operational requirements, we offer multiple process configurations including A²O-MBBR, AO-MBR, multi-stage AO, and AO-MABR, tailored to different treatment objectives and influent conditions.

• Structure and Working Principle

The main body of the equipment is a sealed enclosure made of carbon steel with anti-corrosion treatment, high-strength fiberglass reinforced plastic (FRP), or stainless steel. The interior is functionally zoned, integrating biochemical tanks, sedimentation/membrane tanks, equipment rooms, and intelligent control systems. The core distinction lies in the process configuration of the biochemical section:

1. A²O-MBBR process
   • Process Principle: Building upon the conventional anaerobic-anoxic-aerobic (A₂O) process, MBBR suspended media is introduced into the aerobic zone. The system simultaneously contains both activated sludge and attached biofilm, forming a composite biological treatment system. The media provides extensive attachment surfaces for microorganisms, enabling high-concentration biomass accumulation—particularly favorable for nitrifying bacteria growth—thereby enhancing nitrogen removal, phosphorus elimination, and overall treatment capacity.
   • Technical features: higher volumetric loading capacity with enhanced shock resistance; superior simultaneous nitrification-denitrification efficiency; potentially reduced sludge production.

2. AO-MBR process

• Process principle: The system employs anoxic-aerobic (AO) biological treatment, replacing the traditional secondary sedimentation tank with a membrane bioreactor (MBR). Solid-liquid separation is achieved using hollow fiber membranes or flat membranes, resulting in clear effluent while completely retaining sludge within the biological tank to maintain high activated sludge concentration.
• Technical features: Excellent effluent quality (extremely low suspended solids), suitable for direct reuse; smaller footprint; high sludge concentration, with the system being shock-resistant. However, regular maintenance and cleaning of the membrane are required.

3. Multi-stage AO process

• Process principle: By configuring multiple series-connected anoxic (A) and aerobic (O) units, a multi-stage denitrification-nitrification cycle is formed. This stepwise advancement design aims to more thoroughly remove carbon sources and nitrogen, particularly suitable for wastewater with high requirements for total nitrogen removal and relatively moderate carbon-to-nitrogen ratios.
• Technical features: relatively high denitrification efficiency, good process flexibility; relatively mature operation and management; strong adaptability to water quality variations.

4. AO-MABR process

• Process Principle: The membrane aerated biofilm reactor (MABR) technology is integrated within the AO framework. This technology utilizes permeable membranes as both the aeration carrier and the biofilm attachment substrate, where oxygen diffuses through the membrane wall while the biofilm grows on its surface. It enables single-stage simultaneous nitrification and denitrification with high oxygen utilization efficiency.
• Technical features: relatively low energy consumption (high aeration efficiency); efficient nitrogen removal in a single reactor; stable biofilm structure and consistent treatment performance.
• Core Shared Technical Features

1. Highly integrated and rapid deployment: All process units, equipment, and electrical control systems are prefabricated in the factory, requiring only basic installation and pipeline connection on-site, significantly shortening the construction period compared to traditional civil engineering methods.
2. Intelligent fully automated operation: Equipped with a PLC smart control cabinet, it enables automatic operation and fault alarms for equipment such as pumps, fans, aeration, and disinfection systems. The system supports remote monitoring, offers simple management, and can operate without human supervision.
3. Durable and long-lasting materials: The enclosure is constructed with heavy-duty anti-corrosion technology or corrosion-resistant fiberglass reinforced plastic (FRP), while core components like fans and pumps are sourced from renowned brands to ensure long-term stable operation.
4. Flexible adaptation with customizable processes: Tailor-made solutions are achieved by selecting the optimal process combination to meet various emission standards (e.g., Class A, Class B, or local regulations) and site-specific requirements (e.g., land use, energy consumption).
5. Environmentally friendly and space-efficient: The equipment can be fully buried, semi-buried, or installed above ground, allowing for surface greening, maintaining aesthetics without environmental impact. The integrated design significantly reduces land use.

• Main technical parameters

• Typical Application Fields

This equipment is widely applicable to various decentralized and small-to-medium-scale wastewater treatment scenarios:

• Municipal and rural wastewater: Domestic sewage treatment in rural areas, towns, and urban-rural fringe areas without pipeline coverage or with high pipeline construction costs.
• Residential areas and public service facilities: domestic sewage treatment and reuse from residential communities, schools, hospitals, hotels, resorts, etc.
• Tourism and transportation facilities: independent sewage treatment stations in highway service areas, tourist attractions, and clusters of homestays.
• Industrial supporting wastewater: Complementing low-concentration organic industrial wastewater treatment plants for food processing, slaughtering, and washing.