Res-Kem recently shipped a 52 gpm dual tank greensand filter to a Westchester County New York corporate headquarters campus. This filter uses greensand to remove dissolved and precipitated iron and manganese from the water coming from the local public water system.
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Dual 36" Greensand Filters with
Bray 31 Valves and Bray Series 93 Pneumatic Actuators |
Water Problem:
At a Westchester County corporate headquarters campus, about 4 to 5 times a year, our customer experiences water quality and quantity problems. The campus receives its water from a local public water supplier. High levels of iron and manganese are present within the public water distribution system, and peak flow events such as hydrant flushing or firefighting activities have caused brown water to be drawn into their water system. What exacerbates the problem is the campus is at the end of the water distribution system without looping.
Therefore, iron and manganese laden sediment accumulates the piping and is drawn into the campus drinking water system. Res-Kem designed and constructed a filtration system to remove iron and manganese from the drinking water, as well as a storage tank. The volume of the tank is 150,000 gallons which provides two days of storage in the event of a water emergency with the water supply.
System Solution:
Inlet Iron and Manganese:
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- Average Inlet Iron 0.22 mg/l
- Average Inlet Manganese 0.11 mg/ml
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Flow Operating Conditions:
| Typical: 52 gpm typical |
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System Configuration:
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- Dual Parallel 36" diameter ASME Code, carbon steel tanks Epoxy Lined, NSF 61 certified
- Schedule 80 PVC face piping
- Differential Pressure Switch initiated backwash
- Greensand Plus filtration media
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Control Valves:
| Bray Series 31 valves with Bray Series 93 actuators |
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System Operation:
| Differential Pressure Switch initiates backwash cycle |
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Added Features:
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- Domestic water booster pumping system brings filtered water backwash to system
- Sodium Hypochlorite (NaOCL) serves as the chemical oxidant for the removal of iron and manganese in the filtration system. The NaOCL will be injected immediately upstream on the system influent piping header. Chemical dose will flow paced based from the signal from the filtration systems influent flow meter.
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For Additional Information:
Technical bulletin on
Res-Kem's Greensand/Greensand Plus filters
Online catalog for
Greensand Filter Systems
Technical bulletin on
Greensand Plus filtration media for iron and manganese removal
