Project Background:
The Nanhu Water Reclamation Plant sources water from Xiaonan Lake, a large water body formed by long-term discharge of mine drainage. Due to Ningxia’s arid climate with high evaporation rates, the lake’s water quality is characterized by extreme hardness (>5,000 mg/L), high salinity (18,000–26,000 mg/L), low temperature, and low alkalinity. Ensuring stable water supply for power plants—particularly during Ningxia’s harsh winter—posed significant challenges for treatment and operational reliability.
Project Outcomes:
The upgraded system employs a process chain of screening + ozone oxidation + coagulation-sedimentation (hardness removal) + filtration + ultrafiltration (UF) + reverse osmosis (RO). The treated water meets the GB50050-2007 Industrial Circulating Cooling Water Design Code standards for reclaimed water reuse in indirect open cooling systems. Annual supply capacities include:
Guohua Power Plant Phase II: 2.341 million tons/year
Fangjiazhuang Power Plant: 391,600 m³/year
Yinxing Power Plant: 2.508 million tons/year
Project Type: Membrane Replacement
Influent Source: High-hardness mine water
Commissioning Date: 2023
Process Flow: UF + RO
Technical Performance
Treatment Capacity: 50,000 tons/day
Membrane Area: 49,500 m²
Effluent Quality: SDI ≤3, Recovery rate ≥90%, Turbidity ≤0.5
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