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GREY WATER SKID COMPONENTS AND OPERATION & MAINTENANCE

 

GREY WATER TREATMENT SKID DESIGNED AND ENGINEERED BY PUREWATER

 

GREY WATER TREATMENT SKID SYSTEM

 

Grey water skid system designed to treat & remove TSS (total suspended solids) including small amounts of oil, grease, soap residue & organic materials.  Skid minimum capacity is 1,000 gallons of grey water treatment per day at a peak demand flow rate of 10 GPM.
System to be factory assembled and comprised of (1) 36”x72” clay filtration tank, (2) 24”x 80” activated carbon filter tanks each containing automatic back-flushing valves, (1) pre-chemical feed pump, (1) post-chemical feed pump with automatic chlorine feed, 8” X 10”skid constructed of carbon steel & factory piped (plumbed) with schedule 40 PVC pipe.

             

THE GREY WATER TREATMENT SKID #PW-1000 CONSISTS OF THE FOLLOWING COMPONENTS:

 

1-HP 10 GPM @ 60 PSI CENTRIFIGAL TREATMENT SYSTEM SUPPLY PUMP 230 – 208 VOLT 50 GPM:

SOLENOID VALVES N/O & N/C:           

GREY WATER PUMP SAFETY FLOAT SWITCH (HIGH & LOW):

FLOW SWITCH:

TWIN PRE-TREATMENT BAG FILTERS:

Twin pre-treatment bag filter housings are illustrated in drawing. 


CLAY TANK SPECS:
Clay tank vessel is constructed of  ¼” gauge steel with ASME rating.  Vessel size is 36” x 72” with an 18” top access door with vent.  Vessel is internally coated with Epoxy Resin.  Internal piping materials are CS (SA-36) Schedule 40 PVC.  Inlets & outlets are 2” FNPT.  Drain vent is ¼” OPT (FNPT).  Vessel maximum pressure is 40 PSIG @ 140ºF.  Vessel capacity is 275 gallons with a flow rate of 28-56 GPM based on 5-10 minutes retention time.  Ship weight is 1,500 lbs  Support bed is 36” depth (2” over under-drain required) of gravel or anthracite.  Each vessel is to contain no less than 1250 lbs. of inert organic clay media to be used as a flocculent.  Clay adsorption media is to be impregnated with a quarter nary amine granular and organically modified to be capable of adsorption of 50-60% of their weight in oil, grease and other low solubility organic compounds.

 

ORGANIC CLAY FILTER MEDIA:
Unlike the PW-MCM-830P (100% Organic-Clay filtration media), the MCM-830 is a blend of anthracite and bentonite clay that has been impregnated with a quaternary amine.  A granular, organically-modified clay filtration/adsorption media for water treatment, MCM-830 removes mechanically emulsified oil and grease, free oil and high molecular weight organic molecules.  It is highly versatile, effective, and can be used in pre-treatment, post-treatment, or stand-alone processes.
PW-MCM-830 increases the efficiency of the treatment process - The quaternary amine-treated clay pellets have the ability to capture 50 - 60% of their weight in oil, grease and other low solubility organic compounds.  Used upstream from activated carbon or downstream of other oil removal processes, MCM-830 optimizes the overall system performance and reduces costs can be used as post treatment to oil-water separators or as pre-treatment to liquid carbon filtration systems resulting in cleaner water longer run times than with carbon alone and therefore decreased operational costs. When used alone, the MCM-830 removes oil at 700% the rate of activated carbon and will reduce your operating costs by 50% or more.  When used as a pre-treatment for activated carbon in applications involving oil and grease removal, MCM-830 removes the oil and grease effectively, allowing the activated carbon to remove the soluble organic compounds more efficiently. 


Physical Properties:

Color

Grey/Tan/Black

Density

61 lbs./cu. ft.

Effective Size

8 x 30 U.S. Mesh Size

Moisture

8% Max

Water Retention Drained

10%

 

Conditions For Operation:

Hydraulic Loading

2-5 GPM per sq. ft.

Support Bed

2” Over Under-drain Required (Gravel or Anthracite)

Backwash Expansion

20% of Bed Depth

Bed Depth

36 in.

Retention Time

7-10 Minutes

ACTIVATED CARBON FILTERS

Pressure vessels are constructed of non-corrosive woven fiberglass.  Vessel size is 24” x 80”(including electronic valve). Vessel maximum pressure is 75 psi @ 140 degrees F

 

CARBON AUTO BACK WASH FILTER VALVE S

Mechanical Timer Back-wash Valves Fleck #2850. Valve material is lead-free brass.  Piston is hydraulically balanced with seal & spacer. Inlet & outlet are 1-1/2” NPTF.  Flow rate is 51 GPM with continuous 15 psi drop with a backwash rate of 49 GPM and a peak flow rate of 61 GPM both at 25 psi drop.  Meter accuracy range is 1.5-70 GPM at +/- 5%.  Distributor pilot requires 1-1/2” pipe & 1” NPTM drain line.  Height is 6-1/2” from top of tank.  Rated working pressure of 20-125 psi with hydrostatic pressure of 300 psi and operating temperature range of 34º - 110ºF.  Fully adjustable 5-cycle control for controlled up-flow backwash, down-flow brining, and slow rinse, rapid rinse, timed brine refill & down-flow service.

Model 2850 1.5" Control Valve

 

Valve Specifications
Valve material Lead-free brass*
Inlet/Outlet 1-1/2" NPTF
Cycles 5• Meter initiated regeneration
• Backwash filter
• No hard water bypass piston
• Environmental cover
• Electronic timer, ET or Systemax • Hot water (time clock 180°F; metered valve 150°F)
• Manual operation
• Service valve operator
• Auxiliary switch
• Side mount

Flow Rates (50 psi Inlet) - Valve Alone
Continuous (15 psi drop) 51 GPM side mount
Peak (25 psi drop) 66 GPM side mount
CV (flow at 1 psi drop) 13.2
Max. back wash (25 psi drop) 49 GPM

Regeneration
Down-flow/Up-flow Down-flow only
Adjustable cycles, Yes
Time available Electromechanical: 164 minutes
SE: 0 - 99 minutes
ET: 0 - 999.9 minutes
Systemax: 0 - 999.9 minutes

Dimensions
Distributor pilot 1.9" O.D. (1.5" pipe)
Drain line 1" NPTM
Brine line 3/8" & 1/2"
Mounting base 4"- 8 UN
Height from top of tank 6-1/2"

Typical Applications
Water softener 10"-30" diameter
Iron filter 10"-24" diameter
Sediment filter 10"-24" diameter
Carbon filter 10"-24" diameter
Neutralizing filter 10"-24" diameter

Additional Information
Injector brine system 3/8" - 1600, 3/8" - 1650, 1/2" - 1700
Electrical rating 24 volt, 110  volt, 220 volt - 50 Hz, 60 Hz
Max VA 72
Estimated shipping weight Time clock: 19 lbs.
Metered valve: 27 lbs. Working: 20 - 125 psi Temperature 34° - 110° F
*As defined in the Federal Safe Drinking Water Act; the product also meets
California Proposition 65 Standards Pressure Hydrostatic: 300 ps

 

 

 

 

CHEMICAL FEED PUMPS (CHLORINE) 
Pre and post chemical feed pumps 115 volt 30 GPD 0-100% pump stroke (adjustable).  Chemical feed pumps will include 35 gallon chemical solution tanks.  Chemical feed pumps are powered by a Thomas flow switch.

GREY WATER SKID UNIT
OPERATION & MAINTENANCE
GREY WATER DEFINED:  Grey water, also known as sullage, is non-industrial wastewater generated from domestic processes such as dish washing, laundry and bathing. Grey water comprises 50-80% of residential wastewater. Grey water comprises wastewater generated from all of the house's sanitation equipment except for the septic tank (water from toilets is black water, or sewage). Grey water is distinct from black water in the amount and composition of its chemical and biological contaminants (from feces or toxic chemicals). Grey water gets its name from its cloudy appearance and from its status as being neither fresh (white water from groundwater or potable water), nor heavily polluted (black water). According to this definition wastewater containing significant food residues or high concentrations of toxic chemicals from household cleaners etc. may be considered "dark grey" or black water.
In recent years concerns over dwindling reserves of groundwater and overloaded or costly sewage treatment plants has generated much interest in the reuse or recycling of grey water, both domestically and for use in commercial irrigation. However, concerns over potential health and environmental risks means that many jurisdictions demand such intensive treatment systems for legal reuse of grey water that the commercial cost is higher than for fresh water. Despite these obstacles, grey water is often reused for irrigation, illegally or not. In drought zones or areas hit by hose pipe bans (irrigation restrictions) grey water can be harvested informally by manual bucketing. In the third world, reuse of grey water is often unregulated and is common. At present, the recycling of grey water is poorly understood compared with elimination.
The Pure Water grey water system is designed and engineered to treat waste water (grey water) from laboratories & showers and converting it to the toilets to conserve on water usage.

The grey water unit consist of several components all working in conjunction with each other to accomplish the pre-mentioned goal.

Skid mounted grey water treatment system components are as follows:

  • 1-HP 115 volt 1-phase 10 GPM jet pump controlled by a (N/O) and (N/C ) water float switch mounted in the grey water storage tank.
  • Steel pressurized organic clay filter media tank.
  • Twin bag strainer filters.
  • Pre and post chlorine injection pumps (115 volt 30 gpd) mounted on 36 gallon solution tanks.
  • One (1) auxiliary chemical feed pump and solution tank for coagulation chemical injection as needed.
  • Two activated carbon filters with automatic back wash control valves.
  • 1” Thomas flow switch which engages the chlorine injection pumps as there is a demand for filtered water.
  • There are six (6) electronic solenoid valves integrated into the system to accomplish proper supply and discharge flow sequences.

 

OPERATION MAINTENANCE PROCEDURES

 

SYSTEM OVERVIEW:  

The grey water holding tank will fill & empty as grey water flows from laboratories and showers.  When holding tank is full, the skid pump will engage ad begin the filtration process.  Filtered water will be discharged to the treated water holding tank and dispersed to toilets throughout the building.  When the grey water holding tank is emptied, the skid pump will shut down until the water level in GW holding tank rises to a sufficient level to engage the skid pump for additional filtration and discharge to treated water holding tank.

As grey water leaves the in-ground holding tank, chlorine is injected into the water line to eliminate bacteria. Grey water will then pass through two (2) in-line bag filters removing most TSS (total suspended solids).  Grey water then passes through the organic clay filter media tank removing oil residue, organics and limited amounts of soaps and surfactants.

The partially treated grey water now passes through the two activated carbon filters for a second treatment removing residual organics and chlorine. 

The treated water will be dosed once again with chlorine prior to being discharged to the treated water holding tank.

The two activated carbon filters are programmed to alternate the backwash process every other day.  Once these filters are engaged to backwash, treated water will be used for the backwash process utilizing the treated water tank submersible pumps for required backwash
flow rate (approximately 25 GPM). These functions are enabled by inline solenoid valves as shown on the flow diagram on page 2.

ONGOING MAINTENANCE PROCEEDURES:

  1. GREY WATER HOLDING TANK:  GREY WATER HOLDING TANK SHOULD BE KEPT AS CLEAN AS POSSIBLE USING A POOL BROOM OR SKIMMER NET TO REMOVE FLOATONG SOLIDS.  THIS WILL PROLONG THE FOULING OF THE IN-LINE BAG FILTERS AND PROTECT THE SKID SUPPLY PUMP FROM SOLIDS BUILD-UP.

 

  1. IN-LINE BAG FILTERS:  THE IN-LINE BAG FILTERS WILL NEED TO BE CLEANED AS NEEDED.  A CLOSE EYE SHOULD BE KEPT ON THE TWO (2) LIQUID FILLED PRESSURE GAUGES MOUNTED ON THE TOP OF EACH BAG FILTER HOUSING.  ANY SUGNIFICANT PRESSURE DROP BETWEEN THESE PRESSURE GAUGES AND THE PUMP PRESSURE GAUGE WILL INDICATE BAG FILTER RESTRICTION.  BAG FILTERS CAN BE REPLACED OR CLEANED BY REMOVING THE STAINLESS STEEL BOLT CLAMP ON THE TOP OF EACH FILTER HOUSING, LIFTING OFF HOUSING COVER AND PULLING BAG FILTER AND STAINLESS STEEL STRAINER FROM HOUSING.  NOTE:  MAKE SURE WATER PRESSURE IS RELEIVED PRIOR TO ATTEMPTING BAG FILTER REMOVAL.  ONCE CLEAN OR NEW BAG FILTERS ARE REPLACED,  FILTER HOUSING O-RING IS PROPERLY IN POSITION AND SS BOLT CLAMP IS SECURED TIGHTLY, RE-PRESSURIZE SYSTEM.
  1. CHLORINE INJECTION PUMPS:  THE CHLORINE INJECTION PUMPS ARE MOUNTED ON TWO (2) THIRTY SIX (36) GALLON SOLUTION TANKS IN FRONT OF THE TWO (2) ACTIVATED CARBON FILTERS.  THESE PUMPS ARE DIAPHRAM PUMPS AND ARE CONTROLLED BY A TREATED WATER FLOW SWITCH.  THE PUMPS ENGAGE AS THERE IS MOVEMENT OF TREATED WATER TO TREATED WATER HOLDING TANK.  FILL SOLUTION TANKS WITH CLEAN WATER ADDING THREE (3) GALLONS OF LIQUID 10-12% SODIUM HYPOCHLORIDE (CHLORINE).  DON’T ALLOW SOLUTION TANKS TO RUN DRY.  RE-MIX CHLORINE AND CLEAN WATER SOLUTION WHEN TANK SOLUTION LEVELS ARE NO LESS THAN TEN (10) INCHES FROM BOTTOM OF TANK.  THIS WILL KEEP PUMPS FROM LOOSING PRIM.  IF PUMPS LOSE PRIM, OPEN THE BLEED VALVE COUNTER CLOCKWISE ON THE GREY DISCHARGE FITTING ON TOP OF PUMP.  THIS WILL RELEASE ANY AIR FROM THE ACRYLIC HOUSING AND BLEED BACK INTO SOLUTION TANK.  ONCE PUMPS ARE REPRIMMED, CLOSE BLEED VALVE CLOCKWISE.  SEE ADDITIONAL DETAILS ON CHEMICAL FEED PUMP ON PG. 9.

 

  1. COAGULANT INJECTION PUMP:  THE COAGULANT INJECTION PUMP IS LOCATED TO THE REAR OF THE SKID NEXT TO THE STEEL CLAY FILTER TANK.  THIS INJECTOR PUMP MAY BE USED TO INJECT A CHEMICAL COAGULANT TO THE GREY WATER PROCESS ONCE SYSTEM IS IN SERVICE AND WATER TEST HAVE DETERMINED A PROPER SOLUTION MIXTURE IF ANY.  CONTACT PURE WATER, LLC FOR MIXTURE RATES (1-800-324-1744).
  1. ACTIVATED CARBON FILTER VALVE ADJUSTMENT OR PROGRAMING:  EACH ACTIVATED CARBON FILTER IS CONTROLED BY AN ELECTRONIC TIMER.  REMOVE THE VALVE COVER BY LOSING THE TWO (2) SCREW IN FITTINGS ON EACH SIDE OF THE VALVE.  YOU WILL NOTICE A CLOCK SHOWING THE TIME OF DAY (AM & PM).  PUSH RED BUTTON ON DIAL, ROTATE TO PROPER TIME OF DAY (AM/PM) ALLIGNING WITH TIME OF DAY INDICATOR.  THE SMALL ROUND DISC ON THE RIGHT IS A BACKWASH DAY INDICATOR.  ONE FILTER VALVE WILL HAVE EVERY OTHER ODD SILVER PIN PUSHED OUT AND THE OTHER FILTER VALVE WILL HAVE EVERY OTHER SILVER EVEN PIN PUSHED OUT.  THIS SET-UP WILL ALLOW THE FILTERS TO ALTERNATE BACKWASH CYCLES.  THE BACK WASH CYCLE IS DESIGNED TO ENGAGE AT 12:00 AM.  REMEMBER, THE VALVE WILL ONLY KNOW THE DESIGNATED 12:00 AM BACKWASH TIME IF THE MAIN TIME CLOCK IS SET FOR THE PROPER TIME OF DAY.  SEE #2850 CONTROL VALVE SERVICE MANUAL ON PAGE 7 FOR PROPER TIME CLOCK SETTING PROCEDURES.

CONTROL PANEL

 

The gray water skid control panel is custom designed and engineered for the JE Dunn Corporate Headquarters in Kansas City, Mo.