Description
Problem
Iron and hydrogen sulfide content.
Unit description
The iron removal unit is designed to remove both dissolved iron (Fe2+) and precipitated iron (Fe3+). An AR-type unit also removes a small amount of manganese and hydrogen sulfide. The unit consists of a vessel filled with filter media, a fully automatic controller that manages the filter’s operation and a potassium permanganate tank needed for backwashing the filter media. The filter medium is Greensand Plus, made specifically for water treatment. The unit is not suitable for a system with a biological wastewater treatment plant.
Operating principle
The iron removal process involves catalytic oxidation of the dissolved iron and filtration of the resulting precipitate. During backwashing, the filtered iron sediment is flushed into the drain. The unit works fully automatically, starting regenerations on a time basis. Under the standard program, the unit backwashes every three days. To restore the working capacity of the filter media, a potassium permanganate (KMnO4) solution is used during backwashing; the user must add potassium permanganate to the solution tank regularly. The installation site needs an electrical outlet and a drain connection.
Technical data
| Flow rate, maximum | 0.6 m³/h |
| Operating pressure | 2–8 bar |
| Operating temperature | +5 to +30 °C |
| Electrical connections | 230 VAC / 50 Hz |
| Backwash water volume* | 403 l |
| Backwash water flow rate | 1.37 m³/h |
| Filter media | Greensand Plus, support gravel |
| Unit dimensions (L x W x H) | 515 x 410 x 1565 mm |
| Connections (inlet, outlet, drain) | 1″ male thread, 1″ male thread, 12 mm hose |
| Potassium permanganate (KMnO4) tank | 10 l |
* Water consumption is calculated per backwash at an inlet pressure of 3.4 bar (under the standard program).
Unit components
- Controller
- Timer
- Filter vessel
- Upper screen
- Filter media
- Center tube
- Support gravel
- Lower screen
- Potassium permanganate solution hose
- Potassium permanganate tank
- Potassium permanganate tank overflow
- Potassium permanganate solution
Unit connections
- Outlet – 1″ male thread
- Drain – 12 mm hose
- Inlet – 1″ male thread
