TE-LLLL Water Treatment Description.docx

Dugway Water Systems Description

The Dugway English Village WTP serves English Village Area and Fires Park Area. The English Village Water System receives water from three potable water wells (26 Building 6613, 27 Building 6711 and 30 Building 6813) which produce approximately 2,750 (GPM). The three wells rotate pumping every two weeks so there are always two wells in lead for water production and one well in lag. In normal operation these wells have a combined production capacity of between 800 gpm and 1,950 gpm.

These wells pump into the 400,000 Gallon Raw Water Tank (Tank 5337) which is located adjacent to the Water Treatment Plant (Building 5338). Raw water is pumped from the Raw Water Tank (Building 5337) through the Water Treatment Plant (Building 5338) using booster pumps through two highly adsorptive filter media, and chemical pretreatment system, combine to provide a simple, safe, compact Filtration System. There are three booster pumps which produce approximately 900 (GPM) each used to pump raw water through the media filters. One booster pump is used per filter leaving a backup booster to pump raw water through the filters. The booster pumps rotate use based on amount of hours run time. When two filters are online the WTP will produce 1800 gpm of finished

Well water containing Arsenic and Iron in varying concentration is chemically treated with Sodium Hypochlorite (12%) Disinfection and Ferric Sulfate (60% Ferric Sulfate) (12% Iron) .The Iron is oxidized to a processable form and free chlorine residual is provided to the water distribution system. Water enters the filter at the top of the vessel and is prevented from impinging on the media bed by means of an upper distributor. The water then flows downward and passes through a media bed of specifically graded mulita-filter media that absorbs Arsenic and Iron essentially in hydroxide forms. Then filtered water is collected evenly by means of the underdrain lateral distribution system.

During normal filtration, increasing amounts of oxidized elements are collected in the media. As the filter collects, the frictional resistance of the filter bed to the passage of water increases causing a loss of pressure through the bed. When head loss builds up to predetermined level the filters backwash automatically.

The backwash is accomplished by reversing the flow through the media bed at an accelerated rate to expand the media bed to release accumulated contaminants. The backwash water is driven from the arsenic filter system. All waste from the arsenic filter system goes into the Reclaim Water Tank (Tank 5339) and then leaves the Reclaim Tank and goes into the English Village Sewer Lagoons (6654)

All treated water processed and treated through the Water Treatment Plant (Building 5338) is pumped into the distribution system and two 400,000 Gallon Potable Water Tanks (Tank 5397 & 5399) the treated water is then gravity feed to the Dugway English Village Water System, water system # 23054.

The Dugway Ditto WTP serves Ditto Technical Center, Avery Technical Center, Baker Technical Area and Laser Facility. The Ditto Water System systems # 23021 receives water from two potable water wells (3 Building 4227 and 28 Building 4053) which produce approximately 700 (GPM) these wells seldom are used concurrently, these wells operates in a lead/lag arrangement they rotate after each use in normal operation these wells have a production capacity of between 370 gpm and 400 gpm. Water is received into the 40,000 Gallon Raw Water Tank (Tank 4101) located adjacent to Ditto RO Water Treatment Plant (Building 4103).

Raw Water is pumped from the Raw Water Storage Tank to the Ditto WTP, where it is treated by General Filtration, Granulated Activated Carbon and Reverse Osmosis, and Sodium Hypochlorite (12%) Disinfection. The WTP has an average flow capacity of 103 gpm, with maximum capacity of 310 gpm. The finished Water is received into the 27,800 Gallon RO Treated Water Tank (Tank 4104).

The Ditto WTP High Service Pumps discharge finish treated from the RO Treated Water Tank into a total elevated storage capacity of 500,000 gallons, with 250,000 gallons in each of the elevated tanks at Ditto and Baker. The Ditto Water Tank (Tank 4106) is located just south of the WTP. The Baker tank (Tank 2050) is located in the Baker Area approximately 6.25 miles west of the Ditto Area. Because of the distance and hydraulic gradient between the two areas, the Baker tank cannot be used as a supply for the Ditto area.

Water from the Raw Water Storage Tank is piped into the WTP via a dedicated Water supply line, where it is then pressurized by pumps on the plant’s Forwarding Pumps. Each pump is rated at 200 gpm. The pumps deliver raw water to the inlet of both GAC vessels (up to 133 GPM) and the inlet of the RO treatment system (up to 267 GPM). The portion of raw water sent to the GAC vessels will bypass the RO system and blend with the RO system’s treated effluent water to become Finished Water. The forwarding pumps are designed/configured to work in a lead/lag/standby arrangement.

Some of the water being treated is passed through GAC vessels to reduce organic and particulate contaminants in the raw water. This GAC effluent is routed around (bypassing) the RO treatment system, then blended with the RO Permeate to produce finished water. The GAC vessels are rated at 100 gpm flow each and are designed to be operated in parallel. The GAC effluent must be blended with the RO system’s treated water (permeate) to produce Treated (Finished) Water.

The main component in the Ditto WTP is a RO system that runs in parallel with the GAC system. The RO system has two trains, each of which can be started, operated and shutdown independent of the other. The trains do share a common antiscalant chemical injection system. The Raw Water Feed supplied to the RO trains is chemically treated with antiscalant to reduce scaling potential on the RO membranes. The RO systems is designed to run at a constant flowrate. This results in permeate of sufficient quality to be blended with GAC effluent to produce finished water.

To produce finished water from the Ditto WTP RO permeate is blended with GAC effluent as follows: 133 gpm of raw feed water to produce 100 gpm of permeate and 33 gpm of concentrate when one RO train is running, the 100 gpm of permeate is blended with 67 gpm of GAC effluent to produce 167 gpm of finished water. When both RO trains are online, the system will use 267 gpm of raw feed water to produce 200 gpm permeate and 67 gpm of concentrate. When two RO trains are on line, the 200 gpm of permeate is blended with 133 gpm of GAC effluent to produce 333 gpm of finished water. The blended finished water is treated with sodium hypochlorite, to disinfect the finished water and maintain adequate chlorine residual in the area’s distribution system.

The Ditto RO water treatment process also generates a waste water stream of concentrated raw water salts. The concentrate stream flowrate is approximately 25% of the raw water flow into the RO units. The concentrate stream is routed into existing wastewater lagoons through dedicated air gap and pipelines.

The Dugway Carr WTP serves Carr Area, MTF Area and Defense Training Center. The Carr Water System systems # 23058 groundwater is pumped directly into the Carr WTP by either of two wells (5 Building 3143 and 33 Building 8103). These wells have a combined production capacity of between 660 gpm. These wells never run together, they operate in a lead/lag arrangement they rotate after each use in normal operation the raw water flow is between 310 gpm and 350 gpm.

The Carr WTP treats the Raw Water General Filtration, Granulated Activated Carbon and Reverse Osmosis, and Sodium Hypochlorite (12%) Disinfection. The WTP has an average flow capacity of 32 gpm, with maximum capacity of 310 gpm. The finished Water is received into the 16,600 Gallon RO Treated Water Tank (Building 8105)

The Carr WTP High Service Pumps discharge finish treated from the RO Treated Water Tank into a total elevated storage capacity of 350,000 gallons, in two elevated storage tanks. These are a 100,000 gallon Water Tank (Tank 3145) adjacent to Well 5, and a second tank of 250,000 gallons capacity (Tank 8104) located between the WTP and Well 33.

Raw Water is supplied to the Carr WTP directly from either Well 5 or Well 33, through a common raw water supply line that the two wells discharge into. Once in the plant, raw water is piped to the inlet of both GAC vessels (up to 190 gpm) and to the inlet of the RO treatment system (up to 160 gpm). The portion of raw water sent to the GAC vessels will bypass the RO system and blend with the RO system’s treated water to become Finished Water.

Some of the water being treated is passed through GAC vessels to reduce organic and particulate contaminants in the raw water. This GAC effluent is routed around (bypassing) the RO treatment system, then blended with the RO Permeate to produce finished water. The GAC vessels are rated at 100 gpm flow each and are designed to be operated in parallel. The GAC effluent must be blended with the RO system’s treated water (permeate) to produce Treated (Finished) Water.

The main component in the Carr WTP is a RO system that runs in parallel with the GAC system. The RO system has two trains, each of which can be started, operated and shutdown independent of the other. The trains do share a common antiscalant chemical injection system. The Raw Water Feed supplied to the RO trains is chemically treated with antiscalant to reduce scaling potential on the RO membranes. The RO systems is designed to run at a constant flowrate. This results in permeate of sufficient quality to be blended with GAC effluent to produce finished water.

To produce finished water from the Carr WTP RO permeate is blended with GAC effluent as follows: 80 gpm of raw feed water to produce 60 gpm of permeate and 20 gpm of concentrate when one RO train is running, the 60 gpm of permeate is blended with 95 gpm of GAC effluent to produce 155 gpm of finished water. When both RO trains are online, the system will use 160 gpm of raw feed water to produce 120 gpm permeate and 40 gpm of concentrate. When two RO trains are on line, the 120 gpm of permeate is blended with 190 gpm of GAC effluent to produce 310 gpm of finished water. The blended finished water is treated with sodium hypochlorite, to disinfect the finished water and maintain adequate chlorine residual in the area’s distribution system.

The RO water treatment process also generates a waste water stream of concentrated raw water salts. The concentrate stream flowrate is approximately 25% of the raw water flow into the RO units. The concentrate stream is routed into existing wastewater lagoons through dedicated air gap and pipelines.