I. Project Core
Project Location: Sichuan
Treatment Capacity: 10,000 cubic meters/day (10,000 m³/day)
Core Process: AO (Anaerobic-Aerobic) + MBR (Membrane Bioreactor)
Effluent Standard: Grade A of the “Emission Standard for Pollutants from Urban Sewage Treatment Plants” (one of China's most stringent wastewater discharge standards).
Equipment Selection: 25 units of 16-meter-long integrated flat-plate wastewater treatment equipment.
Equipment Configuration: Integrated, modular, above-ground installation.
Zhongqiao Enlightenment Integrated Sewage Treatment Equipment Project Site
II. Technical Process Analysis: Why Choose “AO+MBR”?
This advanced combined process offers high efficiency, stability, and compact footprint, making it particularly suitable for projects with stringent land use and effluent quality requirements.
AO (Biological Treatment Core):
A Stage (Anaerobic Stage): Primarily functions for phosphorus removal and partial organic hydrolysis/acidification. Polyphosphate bacteria release phosphorus under anaerobic conditions, creating conditions for subsequent excessive phosphorus uptake in the aerobic stage.
O Stage (Aerobic Stage):
Primarily removes organic matter (BOD/COD) and performs nitrification (converting ammonia nitrogen to nitrate). Polyphosphate bacteria also undergo superphosphatization here, with phosphorus removed via sludge dewatering.
Note: Standard AO processes achieve incomplete denitrification. To achieve Class I A standards, more complex A²O (anaerobic-anoxic-aerobic) processes or creating an anoxic zone within the MBR tank after AO are typically required for denitrification. Your equipment may incorporate design optimizations, such as alternating or partitioned anoxic/aerobic zones within the O stage or membrane tank, to ensure total nitrogen compliance.
MBR (Membrane Bioreactor):
Core Function: Completely replaces conventional secondary clarifiers using flat-sheet microfiltration/ultrafiltration membrane modules (typically with pore sizes below 0.1 microns).
Key Advantages:
Superior and Stable Effluent Quality: Physical filtration achieves extremely low suspended solids (SS) and near-zero turbidity, providing a solid foundation for subsequent disinfection and ensuring stable compliance with Class A standards for COD, BOD, total phosphorus, etc. Microorganisms like E. coli are also effectively retained.
High Sludge Concentration, Compact Footprint: The mixed liquor suspended solids (MLSS) concentration in MBR systems is 2-4 times higher than conventional processes. This allows for significantly smaller biochemical tank volumes. Combined with the elimination of secondary sedimentation tanks, the total footprint is drastically reduced. This is the primary reason integrated equipment adopts this process.
Flexible Operation, Strong Shock Load Resistance: Longer sludge retention time promotes the growth of slow-growing nitrifying bacteria, ensuring stable compliance with ammonia nitrogen standards.
High automation level: Easily achieves automated control.
Synergistic benefits: The “AO” system efficiently biodegrades pollutants, while the ‘MBR’ handles sludge-water separation and advanced purification. Their combination achieves a “1+1>2” effect, reliably ensuring compliance with Class A standards.
Zhongqiao Enlightenment Integrated Sewage Treatment Equipment Project Site
III. Equipment and Scale Analysis
Each unit features a containerized design with a length of 16 meters and standardized width/height dimensions. This facilitates factory prefabrication, transportation, and rapid on-site installation.
Integration: AO bioreactors, MBR membrane tanks, and equipment rooms (fans, pumps, control systems) are highly integrated into one or several compact containers.
Scale Calculation (Rough Estimate):
Total Treatment Capacity: 10,000 tons/day ≈ 416 tons/hour (based on 24-hour operation).
Number of Units: 25 units.
Average Capacity per Unit: 10,000 ÷ 25 = 400 tons/day ≈ 16.7 tons/hour.
This represents a highly rational modular configuration. The moderate scale per unit avoids transportation and manufacturing challenges associated with oversized equipment, while achieving large-scale processing through parallel operation. This provides operational flexibility (e.g., decommissioning some units for maintenance during low-flow periods).
IV. Project Features and Advantages
Rapid Deployment: Equipment is prefabricated at the factory. On-site work primarily involves excavation of civil engineering pits, equipment hoisting, and piping/electrical connections, resulting in an extremely short construction cycle.
Land-Efficient: The integrated + MBR process represents one of the ultimate space-saving solutions, making it highly suitable for areas with limited land availability.
Reliable Effluent Quality: Dual-insurance processes ensure consistently high-standard Class A effluent, suitable for reuse in landscaping, irrigation, and flushing.
Easy Management: Automated control enables remote monitoring, requiring minimal operational staff.
Environmentally Friendly: Underground design minimizes odor and noise, reducing environmental impact.
The Sichuan 10,000-cubic-meter domestic wastewater treatment project exemplifies a modern, modular wastewater plant utilizing the advanced “AO+MBR” process with 25 large-scale integrated flat-plate units. It perfectly embodies the current trend of decentralized/semi-centralized wastewater treatment—delivering high standards, minimal land use, and rapid implementation.
