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The problem of dephosphorization using waste recycling
Elena Smirnova1, Mikhail Alexeev2
1Department of Environmental Safety, Saint Petersburg State University of Architecture and Civil Engineering, Vtoraja Krasnoarmejskaja ul. 4, St. Petersburg, 190005, Russia.
Summary
This study optimizes wastewater treatment by using low-cost industrial byproducts for enhanced biological phosphorus removal. This method effectively reduces nutrient pollution, improving water quality in Russia
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Engineering
Background:
- Nutrient pollution from wastewater, particularly nitrogen and phosphorus, causes eutrophication and disrupts aquatic ecosystems in Northwest Russia and the Baltic Sea.
- Limited funding hinders infrastructure upgrades for existing wastewater treatment systems in the region.
- Effective wastewater dephosphorization is crucial for ecological safety and water resource management.
Purpose of the Study:
- To implement enhanced biological phosphorus removal methods for domestic sewage.
- To investigate the use of industrial waste products as cost-effective reagents for wastewater dephosphorization.
- To optimize reagent combinations and treatment processes for maximum nutrient removal efficiency.
Main Methods:
- Chemical injection into biological water treatment systems.
- Utilizing waste products from sulfuric acid production (ferrous sulfate and phosphogypsum) as reagents.
- Employing sand filters after secondary settlers for enhanced phosphorus removal.
- Analyzing micelle creation during coagulation for nutrient removal mechanisms.
Main Results:
- Achieved up to 90% total phosphorus removal efficiency.
- Demonstrated the cost-effectiveness of using industrial waste (ferrous sulfate and phosphogypsum) as dephosphorization reagents.
- Showcased the efficiency of an optimal reagent combination for nutrient removal.
- Observed high removal rates for all phosphorus forms and total nitrogen.
Conclusions:
- The proposed method offers an economical and efficient solution for wastewater dephosphorization.
- Industrial waste utilization presents a viable strategy for improving wastewater treatment in resource-limited areas.
- Enhanced biological treatment with chemical injection and post-filtration significantly improves water quality by reducing nutrient loads.