Evaluation of industrial by-products and natural minerals for phosphate adsorption from subsurface drainage
| Autor: | Bjorn M. Sellner, Todd P. Trooien, Guanghui Hua, Laurent Ahiablame, Christopher Hay, Jeppe Kjaersgaard |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Iron filings
0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Phosphates symbols.namesake chemistry.chemical_compound Adsorption Environmental Chemistry Organic matter Drainage Zeolite Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology chemistry.chemical_classification Nitrates Phosphorus Environmental engineering Langmuir adsorption model General Medicine Phosphate 020801 environmental engineering chemistry Steel Environmental chemistry symbols |
| Zdroj: | Environmental Technology. 40:756-767 |
| ISSN: | 1479-487X 0959-3330 |
| DOI: | 10.1080/09593330.2017.1407364 |
| Popis: | Agricultural subsurface drainage has been recognized as an important pathway for phosphorus transport from soils to surface waters. Reactive permeable filters are a promising technology to remove phosphate from subsurface drainage. Three natural minerals (limestone, zeolite, and calcite) and five industrial by-products (steel slag, iron filings, and three recycled steel by-products) were evaluated for phosphate removal from subsurface drainage using batch adsorption experiments. Phosphate adsorption onto these materials was characterized by Langmuir isotherm and second-order kinetic models. The adsorption capacities increased by factors of 1.2-2.5 when temperature was increased from 5°C to 30°C. Industrial by-products exhibited phosphate adsorption capacities that were one order of magnitude higher than natural minerals. Medium-sized steel chips exhibited high phosphate adsorption capacities (1.64-3.38 mg/g) across different temperatures, pH values, organic matter concentrations, and real drainage water matrixes. The strong chemical bonds between phosphate and steel by-products prevented the release of adsorbed phosphate back to the solution. The steel by-product filter can be paired with a woodchip bioreactor for nitrate and phosphate removal. It is suggested that the phosphate filter be connected to a woodchip bioreactor after the startup phase to minimize the impact of dissolved organic matter on phosphate adsorption. The results of this study suggest that the low-cost steel by-products examined could be used as effective adsorption media for phosphate removal from subsurface drainage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|