| |
|
|
|
|
 |
| |
| FURTHER TREATMENT OPTIONS |
 TERTIARY TREATMENT- MICRO-SCREEN DRUM FILTER
The Micro-Screen Filters are open, gravitational filter sets based on the drum filter principle. The filters are constructed in such a way that they may be built into an underground concrete sewer or attached to a stainless steel tub for aboveground installation. The filter’s simple and robust construction eliminates deposits left below the water surface and guarantees safe, low maintenance service. The automatic two-way rinse filter also ensures simple operation.
|
The screen includes a polyamide 20 micron filter cloth mounted on rotors, a level probe to indicate pressure drop for automatic rinsing procedure, a rinsing pump and a residue pump to transfer the soiled water back to the inlet works. In our quotation the system is constructed of stainless steel and has a separate control panel for a fully automated operation. The client may wish to consider locating the microscreen in an enclosed housing.
|
 CLARIFLO UPWARD FLOW CLARIFIER
The FME Clariflo is an Upward Flow Clarifier, could be used in conjunction with the Treatment Plant to improve the treated effluent quality of 20 mg/l BOD5, 30mg/l S.S. standard to less than 10 mg/l BOD5, 10mg/l S.S. effluent standard.
Tertiary Treatment - Micro-Screen Drum Filter
A Micro-Screen Drum Filter could be used in conjunction with the Treatment Plant to improve the treated effluent quality of 20 mg/l BOD5, 30mg/l S.S. standard to less than 10 mg/l BOD5, 10mg/l S.S. effluent standard.
The UFC Upward Flow Clarifier is a complete Tertiary Treatment Plant including the Graded Media. The plant is factory built ready for installation on the purchasers prepared foundations. The unit comprises a GRP tank together with, ancillary equipment (including media). The tertiary filtration system will be capable of filtering suspended solids down to 30microns (0.03mm), which provide a high quality effluent with a BOD and SS concentrations lower than 10mg/l. It is constructed in filament-wound Glass Reinforced Polyester (GRP) for burial below ground level, with all wetted parts in stainless steel and PVC.
Flow enters the system by gravity, where any sludge will settle at the bottom. Before exiting the plant the flow is forced to pass through a stainless steel woven wire mesh that covers the whole surface area of the unit. Solids greater than 30 microns will be filtered, with the flow entering a chamber before gravitating out of the system. Two pumps installed in the unit and controlled by a dedicated control panel will provide the desludging requirements (back to the inlet works or sludge holding tank) and backwash of the filtering medium. Operations are controlled by timers that can be adjusted to suit the application
|
 SANDFILTER
The effluent exiting the final settlement chamber need further polishing to a 10:10 standard to meet the customers discharge and the Total Phosphates need to be treated to less than 2mg/l.
The polluted water is transported into the filter by means of the pumped feed pipeline (1). The water enters the filter bed (4) through the supply pipe (2) and the distributors (3). The water is purified as it flows through the filter in an upward direction. The filtrate is discharged from the upper part of the filter (5). The filter bed is moving downward as the water flows up. The dirty sand (6) is continuously abstracted from the sand bed and washed, after which it is released back on the top of the sand bed (7). The sand circulation is based on the airlift principle, forcing a mixture of dirty sand and water upward through a central pipeline (8). The intensive scouring movements separate the impurities from the sand particles. At the top of the pipeline the air is released, and the dirty water is discharged (9). The sand then settles in the washer. The sand washer (10) at the top of the filtration tank washes the sand with a small amount of clean filtrate. This removes the last traces of pollutant from the sand. Flow is achieved through a difference in level between the filtrate (11) and the rinse water (9).
See general illustration (actual design may vary) |
|
NUTRIENT REDUCTION
FM Environmental’s Sewage Treatment Plants can be upgraded to offer nutrient reduction to suit applications where nitrogen and phosphorus levels in the discharge waters must be limited. Custom designed arrangements can be provided that incorporate conversion of ammonia in the raw wastewater to nitrates in the main aeration zone and their subsequent recirculation for denitrifcation to take place in a dedicated anoxic chamber. Under anoxic conditions, microbes in the wastewater use the nitrates in a natural respiration process that ultimately releases the nitrogen in gas form to the atmosphere. Phosphorus reduction is usually through precipitation by dosing metal salts into the wastewater. Dosing frequencies are can be determined by separate flow measurement to provide a more efficient deployment of the chemicals.
|
|
|
|
|
|
|
|
|
|
|
|
|
| Tel: +44(0) 28 302 66616 |
|
Greenbank
Industrial Estate, Newry, BT34 2PB, N. Ireland |
|
|
|
|
|
|
