Simultaneous removal of phosphorus and EfOM using MIEX, coagulation, and low-pressure membrane filtration
| Autor: | Hyun-Chul Kim, Thomas C. Timmes, Brian A. Dempsey |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Wastewater
Waste Disposal Fluid law.invention chemistry.chemical_compound law Pressure Environmental Chemistry Coagulation (water treatment) Organic Chemicals Waste Management and Disposal Effluent Filtration Water Science and Technology Chromatography Sewage Fouling Alum Phosphorus General Medicine Ion Exchange Membrane chemistry Sewage treatment Water Pollutants Chemical |
| Zdroj: | Environmental Technology. 36:3167-3175 |
| ISSN: | 1479-487X 0959-3330 |
| Popis: | The feasibility of using magnetic ion exchange (MIEX) treatment, in-line alum coagulation, and low-pressure membrane filtration was investigated for the simultaneous removal of total phosphorus (TP) and effluent organic matter (EfOM) from biologically treated wastewater. The focus was also placed on minimizing fouling of polyvinylidene fluoride and polyethersulfone membranes, which are the most commonly used low-pressure membranes in new and retrofit wastewater treatment plants. MIEX alone was effective for the removal of EfOM, and MIEX plus a small alum dose was very effective in removing both EfOM and TP. MIEX removed phosphorus, but organic acids in EfOM were preferentially removed, and the effects of competing anions on the removal of EfOM were insignificant. All the pretreatment strategies decreased the resistance to filtration. The greatest decrease in fouling was achieved by using MIEX (15 mL L⁻¹) plus a very low dose of alum (∼0.5 mg Al L⁻¹). Sweep floc coagulation using alum and without MIEX also significantly decreased fouling but did not effectively remove EfOM and produced high floc volume that could be problematic for inside-out hollow-fibre modules. The addition of these reagents into rapid mix followed by membrane filtration would provide operational simplicity and could be easily retrofitted at existing membrane filtration facilities. |
| Databáze: | OpenAIRE |
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