MBR System for China Urban Domestic Sewage Treatment

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MBR System for China Urban Domestic Sewage Treatment

Time: Oct. 2010

Water Output: 4×10⁴ m³/d

Background

Yongding Town in Mentougou District, Beijing, faces significant challenges in treating domestic sewage and some industrial wastewater. To improve environmental quality and enhance the reuse rate of water resources, this project has been initiated. With a treatment capacity of 40,000 m³/d, it can meet the daily sewage treatment needs of the area. The reclaimed water was used for landscaping irrigation, road sprinkling, toilet flushing in buildings, and replenishing rivers and lakes. These uses not only help conserve water resources but also effectively improve the local ecological environment.

The MBR system site of china urban domestic sewage treatment.

Project Description

The project adopts AAO + MBR technology. The flow chart is as follows:

The flow chart of AAO+MBR technology for urban sewage treatment project.

This process replaces the traditional biological treatment process's secondary sedimentation tank, filtration tank, and disinfection tank units with a membrane separation system. The membrane modules are directly submerged and installed in the bioreactor tank, achieving solid-liquid separation through highly concentrated activated sludge and hollow fiber membranes with pore sizes smaller than 0.1 μm, thoroughly decomposing pollutants. Compared to traditional processes, the A²/O-MBR process occupies only half the land area of traditional processes, produces 10% to 20% less sludge, and achieves effluent quality superior to the Class A standards.

Feedback

Since its operation, the system has provided nearly ten million tons of high-quality reclaimed water annually for the Mentougou District. Additionally, it has saved a substantial amount of fresh water resources for the region, with all reclaimed water being reused for municipal miscellaneous uses (landscaping, street cleaning, building dust suppression), industrial circulating water, and landscape environments, thereby improving water use efficiency and reducing water extraction costs.

This project has effectively addressed the water pollution issues in the southern part of the new town, significantly alleviating the regional water resource shortage.

Over the past five years, the membrane system has operated stably, consistently producing high-quality effluent, as shown in Table 1.

Table 1: Influent & Effluent Water Quality Comparison
Item	COD_Cr	BOD₅	SS	NH₃-N	TN	TP
Influent	≤450	≤230	≤300	≤30	≤40	≤5
Effluent	≤50	≤10	≤10	≤5	≤15	≤0.5