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Process study of ceramic membrane treatment for water treatment residuals from lake and reservoir water purification plants in severe cold regions

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(9), pp.2399-2410
  • DOI : 10.1007/s42823-024-00769-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : April 9, 2024
  • Accepted : June 26, 2024
  • Published : December 5, 2024

Xu Tiefu 1 Huang Yu 1 Ye Wenfei 2 Wang Man 1 Chen Yuejia 1 Yang Hong 2 Ren Binqiao 3

1School of Civil Engineering, Heilongjiang University
2Shanghai Investigation, Design and Research Institute Co.
3Institute of Advanced Technology

Accredited

ABSTRACT

The cost of treating water purification plant water treatment residuals is high, with a low recovery rate and unstable effluent water quality, particularly in plants using lake and reservoir water sources in severe cold regions. Maximizing water resource utilization requires integrating water treatment residuals concentration and treatment effectively. Here, ceramic membrane technology was employed to separate supernatant and substrate after pretreatment. Optimal settling was achieved using 75 μm magnetic powder at 200 and 4 mg/L of nonionic polyacrylamide co-injection. Approximately 65% of the separated supernatant was processed by 0.1–0.2 μm Al2O3 ceramic membranes, yielding a membrane flux of 50 L/m2h and a water recovery rate of 99.8%. This resulted in removal rates of 99.3% for turbidity, 98.2% for color, and 87.7% for color and permanganate index (chemical oxygen demand, COD). Furthermore, 35% of the separated substrate underwent treatment with 0.1–0.2 μm mixed ceramic membranes of Al2O3 and SiC, achieving a membrane flux of 40 L/m2h and a water recovery rate of 73.8%. The removal rates for turbidity, color, and COD were 99.9%, 99.9%, and 82%, respectively. Overall, this process enables comprehensive concentration and treatment integration, achieving a water recovery rate of 90.7% with safe and stable effluent water quality.

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