Product Introduction

In the process of rural revitalization and the construction of beautiful countryside, the treatment of domestic wastewater in rural areas and small towns poses a significant challenge. Traditional centralized wastewater treatment plants require substantial capital investment, extensive pipeline networks, and high operating costs, while also demanding specialized technical personnel for maintenance—factors that often make it difficult to implement them effectively in village and town settings.

To this end, we have innovatively developed the AAO-Coupled Autotrophic Direct Filtration (AAO-ADF) system. This system deeply integrates the well-established AAO biological treatment process with the groundbreaking “autotrophic direct filtration” unit, aiming to provide an efficient, stable, and virtually maintenance-free distributed wastewater treatment solution for rural and township areas.

Process Flow

Model/Specification

Core Technological Advantages

This system comprises two core modules that are not merely connected in series; instead, they work in concert to create a synergistic, organic whole through an innovative “microbial sludge feedback” mechanism.

1. Core Module 1: Enhanced AAO Biological Treatment System

· Function: Efficiently removes COD and BOD while completing the core biological nitrogen and phosphorus removal processes.

· Features: Employs a mature and stable anaerobic-anoxic-oxic process to provide high-quality, stable influent for advanced treatment.

2. Core Module Two: Autotrophic Direct Filtration (ADF) Unit (“3-Free” Direct Filtration Advanced Treatment System) (the Technological Soul)

· Function: Achieve deep solid–liquid separation and produce clear recycled water.

· The connotation of “3-Free”:

· Power-free water production: Leveraging the system’s inherent hydraulic head difference, no additional booster pumps are required, resulting in a more than 90% reduction in specific energy consumption per ton of water compared with conventional membrane processes.

· No consumable replacements: A specially designed mud-water separation filter element, combined with an efficient air–water coupling backwashing technology, enables continuous operation with only periodic filter maintenance, eliminating the need for lifetime replacement and thereby eliminating ongoing consumable costs.

· Non-discriminatory influent acceptance: The system exhibits strong tolerance to fluctuations in the effluent quality from the preceding biochemical treatment stage—such as sudden increases in suspended solids or the entry of oil-containing wastewater—and demonstrates exceptional shock-load resistance, thereby ensuring continuous and stable operation.

3. The Key to Synergistic Efficiency: the Intelligent Feedback Mechanism of “Selective Elimination of Inferior Strains and Favoring Superior Ones”

· This is the core technology that enables this process to surpass conventional “biochemical treatment + filtration” combinations. During suspended-solids removal, the direct-filtration unit intelligently selects microorganisms:

· Superior performance: High-quality floc with excellent settling properties and high activity is retained and returned to the biological tank.

· Elimination of inferior sludge: Aging, dispersed inert sludge flocs are discharged from the system with the backwash water.

· System-level value delivered:

· Biological system optimization: Continuously refine the microbial community structure in the biological tank, enrich functional microorganisms, and enhance denitrification and phosphorus removal efficiency.

· Eradicate sludge bulking: inhibit the excessive proliferation of filamentous bacteria at the source, thereby resolving the most challenging operational issue in conventional processes.

· Exceptionally stable operation: the biological system and the filtration system mutually reinforce each other, creating a virtuous cycle.

Summary of System Features and Benefits

1. Excellent effluent quality: By integrating the AAO process’s advanced denitrification and dephosphorization with the ADF unit’s highly efficient solid–liquid separation, the effluent is clear and transparent, with key parameters—including COD, NH3-N, SS, TP, and TN—consistently meeting or exceeding the Class 1A standard of the “Pollutant Discharge Standard for Municipal Wastewater Treatment Plants” or applicable local standards.

2. Extremely low operating costs: The “3-Free” design fundamentally eliminates the two major cost drivers—energy consumption and consumables—resulting in total lifecycle costs that are significantly lower than those of conventional processes.

3. Simple maintenance and management: No need for full-time, on-site technical personnel; only routine daily inspections are required, making it highly suitable for management by non-technical teams at the village or town level.

4. Environmentally Friendly: Low energy consumption aligns with the “dual carbon” goals; the system can be fully or partially buried, allowing the above-ground space to be landscaped and fostering harmonious coexistence with the surrounding environment.

Typical Application Scenarios

1. Advanced treatment and reuse of industrial park wastewater: used for make-up water in recirculating cooling systems, landscaping within the plant area, and other applications, thereby reducing the enterprise’s fresh water consumption.

2. Reuse of reclaimed water in public buildings and residential communities: Greywater is treated and reused for toilet flushing and landscape irrigation, thereby achieving internal water resource circulation.

3. Landscape and Environmental Water Body Management and Replenishment: Treated high-quality effluent can be directly used to replenish rivers and lakes, thereby enhancing the aesthetic and ecological quality of these water bodies.

4. Distributed Wastewater Treatment Plants: Suitable for scenarios such as beautiful countryside areas, tourist zones, and highway service areas, these plants enable efficient, low-maintenance wastewater resource recovery.

Conclusion

The Mefit “AAO+ 3-Free Direct Filtration” intelligent, low-carbon, dual-efficiency wastewater treatment system seamlessly integrates conventional biological treatment with innovative self-optimizing filtration technology, thereby effectively resolving the longstanding trade-off between high-quality effluent quality and high operating costs. This system is not a mere imitation of MBR; rather, it strikes a superior balance among effluent quality, overall life-cycle cost, and operational complexity, making it the ideal choice for customers in the era of the “dual carbon” goals who seek to align economic and environmental benefits.

We offer not just a single piece of equipment, but a long-term, stable, and cost-effective “water circulation” solution.

Product Display Images  

·Robust, corrosion-resistant design: A carbon steel main structure, combined with specialized anti-corrosion treatment for parts in contact with water, ensures long-lasting durability of the equipment.

·High-efficiency, energy-saving operation: Distinguishes between backwash mode (high power) and routine operation mode (low power), resulting in low actual energy consumption and cost-effective operation.

·Flexible Customization Solutions: To meet the diverse needs of different projects, we offer a range of customized services for non-standard water volumes and materials.