Canadian wastewater treatment project case

 

  一.Background

      A company discharges 5,000 tons of wastewater daily, mainly from various stages of production, such as raw material washing, high-concentration wastewater, fermentation wastewater, and equipment cleaning. The wastewater is characterized by high levels of ammonia nitrogen, organic matter, and sulfates. In response to environmental protection requirements, the company has decided to install a reverse osmosis system.

      二.Challenges in Wastewater Treatment

      High sulfate levels inhibit microbial activity; conventional biological treatment reduces the load. ‌

      High ammonia nitrogen levels require combined short-cut nitrification or anaerobic ammonia oxidation for nitrogen removal. ‌

      三.Wastewater Treatment Plant Four Stages

      1.Pretreatment

      Coarse/fine screens and grit interception: Removing large particulate impurities, suspended solids, and organic matter through reverse osmosis.

      Aerobic treatment: Degrading residual organic matter using activated sludge or biofilm methods, achieving a final COD removal rate exceeding 90%.

      2.Advanced Treatment

 ‌     Removing trace pollutants (such as nitrogen, heavy metals, etc.) and pathogens through membrane separation, chlorination disinfection, and chemical phosphorus removal, ensuring safe effluent.

      3.Special Treatment

      Using decolorizing agents and coagulants to remove soy sauce wastewater, achieving a removal rate exceeding 90%.

      4.Exhaust Gas Treatment

      Spray absorption towers absorb hydrogen sulfide with alkaline solution, and bio-trickling filters degrade residual VOCs.


Figure 2 Reverse osmosis equipment

      四.Wastewater Treatment Process

      The process adopts a combination of "equalization tank + hydrolysis acidification + salt-tolerant MBR +RO" to simultaneously solve the problem of high-salinity wastewater treatment and achieve a win-win situation for both the environment and the economy.

Figure 3 Reverse osmosis equipment

      五.Treatment Results

      Wastewater COD decreased from 4900 mg/L to below 50 mg/L, and chloride ion concentration decreased from 7800 mg/L to 400 mg/L

      Hydrogen sulfide removal rate in exhaust gas >98%, emission concentration <0.5 mg/m³.

      Effluent meets the Class I standard of the "Integrated Wastewater Discharge Standard," and odor around the plant area has been significantly improved.

      Related Recommendations:

      What is a reverse osmosis system? How does it work?      

             Can reverse osmosis remove fluoride from water? How?

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