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Optimization of phosphorus removal from secondary effluent using simplex method in Tianjin, China
Yuqiu Wang1, Tianwei Han, Ze Xu
1College of Environmental Science and Engineering, NanKai University, Tianjin, China. yqwang@nankai.edu.cn
Journal of Hazardous Materials
|May 12, 2005
Summary
This study optimized phosphorus removal from wastewater using ferric sulfate, aluminum sulfate, and polyaluminum chloride (PAC). Optimal conditions achieved high removal efficiencies, averaging over 87.25% for total phosphorus.
Area of Science:
- Environmental Science
- Water Treatment Technologies
Background:
- Elevated phosphorus levels in aquatic environments contribute to eutrophication.
- Wastewater effluent is a significant source of aquatic phosphorus pollution.
Purpose of the Study:
- To determine optimal coagulation conditions for phosphorus removal from secondary effluent.
- To compare the efficacy of ferric sulfate, aluminum sulfate, and polyaluminum chloride (PAC) for phosphorus removal.
Main Methods:
- Jar tests were conducted using simplex research technique for optimization.
- Evaluated ferric sulfate [Fe2(SO4)3], aluminum sulfate [Al2(SO4)3.18H2O], and polyaluminum chloride (PAC).
- Carried out 18-25 experiments per coagulant to identify maximum removal efficiencies.
Main Results:
- Removal efficiencies increased by over 30% during experimental optimization.
- Achieved average removal efficiencies of at least 87.25% for total phosphorus.
- Orthophosphate removal efficiency exceeded total phosphorus removal for all coagulants tested.
Conclusions:
- Ferric sulfate, aluminum sulfate, and PAC are effective coagulants for phosphorus removal.
- Optimal conditions yielded high total phosphorus removal efficiencies: 87.3% (ferric sulfate), 95.6% (aluminum sulfate), and 94.0% (PAC).
- Resulting minimum total phosphorus residuals were 0.35 mg/L, 0.12 mg/L, and 0.16 mg/L, respectively.