As urbanization accelerates, managing domestic sewage has become an urgent environmental challenge. In Gansu Province, increasing wastewater volumes driven by population growth and urban expansion placed heavy pressure on local ecosystems. To meet Gansu’s Class I discharge standards, a dedicated 300m³/day sewage treatment station was established.
After thorough technical evaluation, the QDPP Integrated Wastewater Treatment System, developed by MOTIVA, was selected as the core treatment solution for its compact footprint, high efficiency, and robust adaptability to urban and semi-urban conditions.
Equipment Configuration and Technical Parameters
QDPP Integrated Treatment Units
- Quantity: 2 units
- Capacity: 150 m³/day each; 300 m³/day total (parallel configuration)
- Features: Each unit integrates pre-treatment, biological treatment, and advanced filtration in a modular system. The design is compact, easy to install, and capable of stable, high-efficiency operation.
Septic Tanks
- Quantity: 3 units
- Function: Remove large solids and organic matter during pre-treatment, reducing load on downstream systems.
Equalization Tank
- Quantity: 1 unit
- Function: Balances flow and water quality to ensure stable conditions for biological processes and membrane filtration.
Process Flow Overview
The project adopts an AO+MBR hybrid process, integrating biological degradation and membrane separation. The key process stages include:
- Septic Tanks: Initial stage where coarse solids and large organic pollutants are removed.
- Equalization Tank: Ensures consistent hydraulic and organic loading to downstream units.
- Mechanical Bar Screen: Filters fine debris to protect sensitive components.
- AO Biological Treatment:
- Anaerobic Stage: Microorganisms degrade complex organics and lower COD/BOD values.
- Aerobic Stage: Oxidation of organics and biological nutrient removal (nitrogen and phosphorus).
- MBR (Membrane Bioreactor):
- Combines activated sludge with membrane filtration.
- Enhances pollutant removal while retaining microorganisms and suspended solids.
- Produces high-clarity, Class I-grade effluent with minimal sludge generation.
- Discharge: Treated water meets Gansu Class I local discharge standards, suitable for direct release or non-potable reuse.
Project Highlights
1. High Treatment Efficiency
AO+MBR technology provides superior removal of organics, nitrogen, and phosphorus, delivering stable Class I effluent performance.
2. Compact & Space-Efficient Design
QDPP’s integrated structure minimizes installation space—ideal for urban or land-constrained sites.
3. Stable and Reliable Operation
Equalization tanks regulate inflow conditions, while MBR membranes ensure consistent effluent quality and prevent system failure.
4. Simplified Operation and Maintenance
The system is highly automated, reducing the need for manual oversight and minimizing operational costs.
5. Environmentally Friendly
The project reduces pollutant discharge, protecting local water bodies and contributing to regional ecological restoration.
Implementation Results
Since commissioning, the system has operated reliably, consistently delivering effluent that meets Gansu’s Class I standard. Routine monitoring confirms high removal rates of COD, ammonia nitrogen, and total phosphorus. The project has significantly improved local water quality, supporting public health and environmental goals.
The success of this initiative offers a scalable and replicable model for similar urban and semi-rural wastewater challenges. It also serves as a strong reference for future deployments of QDPP + AO+MBR solutions.
Conclusion & Outlook
The Gansu 300m³/day domestic sewage project marks another milestone in MOTIVA’s pursuit of innovative and reliable wastewater solutions. By combining advanced materials, intelligent system design, and mature AO+MBR technology, MOTIVA provides an effective response to the increasing demands of urban sewage treatment.
Looking ahead, as environmental standards continue to rise, MOTIVA remains committed to developing high-performance, scalable solutions. We welcome partnerships with local governments, EPC contractors, and developers to co-create sustainable wastewater infrastructure across China and beyond.Ready to upgrade your wastewater treatment system?Contact our engineering team today to learn how QDPP integrated solutions can transform your project with high efficiency, reduced footprint, and long-term reliability.
