Beverly Hills Reverse Osmosis Water Treatment Plant rev

City of Beverly Hills

Reverse Osmosis

Water Treatment Plant

Providing a safe and reliable supply of drinking water has always

been a goal of the City of Beverly Hills. Today’s growing municipal

water needs require the treatment of millions of gallons of water each

day. Through a partnership with the City of Beverly Hills and Earth

Tech, a proven provider of Total Water Management, the Public Works

Facility and Water Treatment Plant was built to enhance the

community’s water resources and provide its citizens sustainable,

quality water services for generations to come. This successful

partnership will continue to operate the facilities, benefiting everyone

who lives, visits or works in Beverly Hills.

City of Beverly Hills Reverse Osmosis Water Treatment Plant

TABLE OF CONTENTS

Page

Definition of Terms .................................................................................................... 1

Purpose of Water Treatment System ........................................................................ 1

Principles of Operation of the Overall Water System ................................................ 1

System Description ................................................................................................... 2

Overview ............................................................................................................... 2

Antiscalant Chemical Dosing System................................................................ 4

Sulfuric Acid Chemical Dosing System ............................................................. 4

One-Micron Cartridge Filters ............................................................................. 4

RO High Pressure Pumps ................................................................................. 5

Reverse Osmosis System ................................................................................. 5

Hydrogen Sulfide Stripper System .................................................................... 5

Sulfuric Acid Chemical Dosing System ............................................................. 6

Hydrogen Sulfide Scrubber System .................................................................. 6

Caustic Soda Chemical Dosing System ............................................................ 7

Sodium Hypochlorite Chemical Dosing System ................................................ 7

R.O. Configuration............................................................................................. 8

Reverse Osmosis Membranes .......................................................................... 8

Permeate Tube.................................................................................................. 9

RO Element Housings (Pressure Vessels) ....................................................... 9

High Service Pumps # 3 .................................................................................... 9

Flushing/CIP System ....................................................................................... 10

Hydrogen Sulfide Stripping.............................................................................. 11

Hydrogen Sulfide Scrubbing............................................................................ 11

RO Cleaning Cycle .......................................................................................... 11

RO Cleaning Cycle – 1st Phase Shown .......................................................... 12

Finished Water Clearwell ................................................................................ 12

Plant Overview ................................................................................................ 13

Plant Flow Diagram ......................................................................................... 14

Pretreatment.................................................................................................... 15

Reverse Osmosis ............................................................................................ 16

Air Strippers & Scrubber.................................................................................. 17

Finished Water ................................................................................................ 18

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1

Definition of Terms

Brine - (1) Reject - normally, the waste stream from reverse osmosis

system, which contains most of the dissolved solids in the feed in a

concentrated form. (2) Regenerant - water saturated or strongly

impregnated with salt.

Concentrate - The reject (waste) from a reverse osmosis element.

Membrane - A barrier, usually thin, that permits the passage only of

molecules up to a certain size range and/or certain charge characteristics.

Membrane Element - An individual membrane assembly, usually tubular,

must be housed in some type of pressure vessel.

Module - A single pressure vessel or housing containing membrane

elements.

Module Assembly - An array of membrane housings.

Osmosis - The passage of water molecules through a semi-permeable

membrane separating two solutions of different concentrations (the water

passes into the more concentrated solution).

Osmotic Pressure - Pressure required to prevent spontaneous flow of

solvent (water) into the more concentrated solution when a semi-

permeable membrane separates two solutions of different concentration.

Reverse Osmosis - Forced flow of solvent (water) from a solution

through a semi-permeable membrane by means of pressure in excess of

the osmotic pressure.

Purpose of Water Treatment System

Residents in the City of Beverly Hills presently receive their water service

from the Metropolitan Water District (MWD) of Southern California.

Through an agreement with MWD, the City has been developing

supplemental groundwater well supplies. The City of Beverly Hills Reverse

Osmosis Water Treatment Plant was designed to reduce total dissolved

solids (TDS), total hardness, hydrogen sulfide, iron, and manganese

concentrations in the groundwater supply wells that have been developed by

the City. The final goal is to provide water similar to the MWD water

supplied to the City of Beverly Hills.

Principles of Operation of the Overall Water System

The City operates and maintains the four water supply wells. Water from the

wells are collected in a common water main and transmitted to the water

plant. Well No. 6 is transmitted north separately. Both raw water

transmission mains combine outside the treatment plant, providing a blended

water supply. To initiate plant operations, the plant operator coordinates


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with the City to select the desired combination of water supply wells to

provide the required influent water quality and quantity.

After treatment water discharges into a 16-inch dedicated water transmission

main which is connected to Sunset Reservoir where MWD water enters the

Beverly Hills system. The Beverly Hills Water Treatment Plant operates at a

constant rate, with the MWD influent varying to match the system demand.

System Description

Overview

The Water System consists of a single Reverse Osmosis (RO) Train and its

associated pre-treatment and post-treatment equipment.

Pretreatment equipment includes two horizontal 1-micron cartridge filters

and one Antiscalant (Scale Inhibitor) injection system. In addition, a sulfuric

acid injection system has been provided to ensure that the RO is operated at a

high recovery ratio.

The Reverse Osmosis Train is furnished with membrane housings, membrane

elements, piping, energy recovery turbine, sampling, instrumentation and

PLC controls. A CIP (Clean-In-Place) system is also provided to enable the

membranes to be cleaned regularly in order to extend their life.

Post Treatment consists of sending the permeate water through a packed-

tower stripper to provide removal of hydrogen sulfide.

The blend by-pass water is also treated with acid and sent to a packed-tower

stripper also to remove hydrogen sulfide.

The foul air exhaust from both strippers is taken to a three-stage scrubber to

remove the hydrogen sulfide using caustic soda and sodium hypochlorite so

that the air can be released to the atmosphere.

The water from each of the two strippers is blended in the clearwell and

sodium hypochlorite added for disinfection. Three high service pumps are

provided to pump the water to the City of Beverly Hills Water System.

The function of each component in this system is as follows:

Antiscalant Injection System: To delay the precipitation of the scaling

salts such as Calcium Carbonate (CaCO3), Barium Sulfate (BaSO4) and

Silica (SiO2) within the RO membrane, thus allowing the RO system to

operate at a higher recovery.

Sulfuric Acid Injection: To reduce the feedwater pH to 7.0 thereby

reducing the alkalinity and the tendency to scale by lowering the

Langelier Index. This also assists in allowing the RO to operate at a

higher recovery (design 78%).

1-micron Cartridge Filters: To remove particles in the feedwater larger

than 1-micron diameter.


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Reverse Osmosis System: To remove dissolved salts from the water.

Permeate Air Stripper: To remove hydrogen sulfide from the permeate

water.

Blend By-pass Air Stripper: To remove hydrogen sulfide from the by-

pass raw water.

Sulfuric Acid Injection: To reduce the by-pass raw water pH to 6.0

thereby increasing the fraction of the hydrogen sulfide in the gaseous

form and improving the efficiency of the stripper

Scrubber: To remove hydrogen sulfide from the foul air in order to

allow discharge to atmosphere.

Caustic Soda Injection to the first stage of the scrubber: To remove

most of the hydrogen sulfide as sodium sulfide.

Caustic Soda Injection to the second/third stages of the scrubber: To

remove most of the remainder of the hydrogen sulfide as sodium sulfide.

Sodium Hypochlorite Injection to the second/third stages of the

scrubber: To remove the last traces of hydrogen sulfide by oxidation to

sodium sulfate.

Twin Tank Softener System: To provide softened permeate for

scrubber circulating water make-up in order to avoid precipitation of

hardness after several cycles of concentration.

Sodium Hypochlorite Injection to the blended water to the clearwell:

To sanitize the treated water and maintain the clearwell and distribution

system free of biological activity.

Caustic Soda Injection to the high service water pumps discharge:

To increase the treated water pH to prevent corrosion in the distribution

system.

Ammonia Injection to the high service water pumps discharge: To

combine with a proportion of the free chlorine to form chloramines for

increased sanitizer stability in the distribution system.

CIP System: To clean the RO membranes after fouling has occurred.

Twin Tank Softener System: To provide softened treated water for

cleaning tank make-up during periods when no permeate is available.

Clearwell (40,000 gallons): To allow mixing and disinfection prior to

pumping to distribution system

Chemical Storage Area: To store and distribute chemicals to all process

related injection points

High Service Pumps (#1 and #2- Service to Sunset Reservoir and #3

Service to Zone 4): To pump treated water to the City of Beverly Hills

Water Distribution System.

Post production water analyzers: To monitor water parameters (quality

related) including pH, turbidity, conductivity and residual chlorine.


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Antiscalant

Sulfuric Acid

Cartridge Filter Vessel

Antiscalant Chemical Dosing System

The electronic chemical metering pump draws chemical from the holding

tank and delivers it at a controlled rate to the RO feed water.

Antiscalant is a scale inhibitor chemical which, when injected at the specified

levels, protects the downstream RO membranes from salt precipitation. Due

to the process of salt concentration occurring on the concentrate side of the

RO membranes, some salts reach saturation and would tend to come out of

solution and deposit on the membrane surface. The antiscalant chemical

delays the salt precipitation process until the concentrate has exited the

system thus preventing scaling of the membrane surfaces. Scaling causes are

due to the following:

Salts such as CaCO3, CaSO4, BaSO4, SrSO4, etc…(primarily CaCO3 at

the Site).

Metal hydroxides - common with high iron well water if air contact

occurs before processing.

Silica (the main limitation on the recovery of this water).

A special anti-scalant must be used which is effective with silica as well as

other salts.

Sulfuric Acid Chemical Dosing System

Sulfuric Acid is fed to the RO influent feed water to maintain a constant pH

of 7.0. pH Control is critical in the processes following.

This system will use Sulfuric Acid at a concentration of 93%. This product

will meet N.S.F. approval standards and be fed at a rate of approximately 51

mg/l or 55.9 gallons per day.

One-Micron Cartridge Filters

The cartridges remove suspended particles of 1 µm (micron) in size and

greater. Water flows from the outside to the inside of the cartridges where it

is collected inside the core. As water pushes its way out, particles in excess

of 1 micron in size are trapped on the filter media. Eventually, more and

more particulates plug the cartridge(s), the surface area available for filtration

decreases, and the pressure drop (∆P) between inlet & outlet of housing

increases. It is typical to change cartridges when the ∆P reaches 10 psi.

Depending on the water quality, cartridges are typically changed every 2

weeks to 1 month.

Differential pressure is indicated and monitored; a high differential pressure

across the cartridge filter transmits an analogue signal to the PLC. An alarm

is triggered on the RO panel.


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RO High Pressure Pumps

RO System

Strippers

RO High Pressure Pumps

Two (One duty, One standby) vertical turbine pumps manufactured by Afton,

from 316 SS tag # HPP-113-1 & HPP-113-2 Model # MPV, 6 X 8 X 10 complete with 150 hp high efficiency motors with

variable speed drives.

The pumps are each rated for a maximum of a 1,318 gpm @ 331 ft. and 3621

rpm.

Reverse Osmosis System

The Reverse Osmosis System is designed to produce up to 1,028 gpm of

product water from a feed of up to 1,318 gpm. The membranes are arranged

as a 2-Stage system where the reject water exiting the first stage RO housings

becomes feed water for the second stage thereby allowing increased system

recovery. The RO vessels are arranged in three banks each containing 10

vessels arranged in parallel. The first two banks make-up the first stage and

the third bank the second stage.

Hydrogen Sulfide Stripper System Permeate Stripper

The Permeate Stripper Tower is designed to remove >91% of the 4 ppm of

hydrogen sulfide gas present in the raw feed and permeate water at up to a

maximum of 1,331 gpm. It is a countercurrent design 8' 0" diameter X 20'

high on straight manufactured from FRP and lined with an NSF approved

resin. The inlet distributor is a weir trough design to give good spreading

characteristics with minimum head loss. The tower is packed with 12' 6" of

3.5" "Lanpac" although calculations require only a minimum of 6.3' to

achieve design removal. The tower is designed to perform using 3,000 -

4,000 cfm of air, induced by the blower on the scrubber inlet. The calculated

packing pressure drop is 0.01" W.C./ft. Total pressure loss through whole

stripper system is calculated at 0.537" W.C.

The Permeate Stripper tower air quality is monitored as per the South Coast

Air Quality Management District (SCAQMD) permit. Blend By-Pass Stripper

The Blend By-Pass Stripper Tower is designed to remove >91% of the 4 ppm

of hydrogen sulfide gas present in the raw feed water at up a maximum of

1,125 gpm. It is a countercurrent design 7’ 0” diameter X 20’ high on straight

manufactured from FRP and lined with an NSF approved resin. The inlet

distributor is a weir trough design to give good spreading characteristics with

minimum head loss. The tower is packed with 12’ 6” of 3.5” “Lanpac”

although calculations require only a minimum of 7.54’ to achieve design

removal. The tower is designed to perform using 3,000 – 3,800 cfm of air,

induced by the blower on the scrubber inlet. The calculated packing pressure


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drop is 0.013” W.C./ft. Total pressure loss through whole stripper system is

calculated at 0.623” W.C.

The Blend By-Pass Stripper tower air quality is monitored as per the South

Coast Air Quality Management District (SCAQMD) permit.

Sulfuric Acid Chemical Dosing System

Sulfuric Acid is fed to the blend by-pass stripper influent feed water to

depress the pH to 6.0 for maximum efficiency of hydrogen sulfide removal.

The lower the pH, the higher the percentage of sulfide removal. This

stripping process should remove approximately 90% of the hydrogen sulfide.

The remainder H2S will be oxidized to sulfate in the treated water clearwell.

Sulfuric Acid

Scrubber

This system will use Sulfuric Acid at a concentration of 93%. This product

will meet N.S.F. approval standards and be fed at a rate of approximately 254

mg/l or 168.2 gallons per day.

Hydrogen Sulfide Scrubber System Packaged Three Stage Scrubber System

The Scrubber system supplied by U.S. Filter is a three stage packaged odor

control system designed to treat the foul air extracted from the permeate

water and blend strippers.

The system is fed by a blower with a normal rating of 6,000 cfm, which can

be increased if necessary to 8,424 cfm by changing the belt drive pulleys

(supplied). The guaranteed removal efficiency is >99.5%. The three-stage design minimizes chemical consumption as it allows the bulk

of the hydrogen sulfide to be converted to sodium sulfide in the 1st

stage

using only caustic soda. The 2nd

stage uses fresher caustic soda plus some

sodium hypochlorite and finally the 3rd

stage also uses fresh caustic soda and

hypochlorite. The first stage uses fresh caustic soda plus caustic soda and sodium

hypochlorite left over from the 2nd

stage & 3rd

stages. The 2nd

& 3rd

stage uses

fresh caustic soda and sodium hypochlorite. The 2

nd /3

rd stage recirculating water is drawn from the 2

nd /3

rd stage sump

and pumped via the 2nd

/ 3rd

stage pump at 225 gpm. The pump flow is split

150 gpm to the 3rd

countercurrent stage and 75 gpm to the 2nd

co-current

stage. Water make-up is soft water fed to the 2

nd /3

rd stage sump at 1-5-gpm. This

continuously overflows, taking the excess chemical to the 1st

stage sump

where it is consumed along with the fresh caustic soda.


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The 1st

stage water is drawn from the 1st

stage sump and is recirculated via

the first stage pump countercurrent to the incoming foul gas at 150 gpm.

This water overflows to waste to maintain the level constant. The cycles of

concentration are controlled by regulating the make-up rate, which is

normally in the 1-5 gpm range.

The caustic and hypochlorite additions are controlled by the analogue outputs

of the respective pH and ORP meters. The Scrubber emissions are monitored

as per the South Coast Air Quality Management District (SCAQMD) permit.

Twin Alternating Softeners for Scrubber Make-Up

The U.S. Filter model KF twin-alternating softeners are designed to remove

the last traces of hardness from the stripped permeate before being fed to the

scrubber as make-up. This will ensure that no hardness scale is formed

within the scrubber system, which is at a high pH and undergoes several

cycles of concentration in order to obtain minimum blow down.

Softener

Caustic Soda

Sodium Hypochlorite

In case of no permeate being available e.g. at start-up, the treated water

connection can be used which supplies water from the high service pumps

discharge. This will put a far higher load on the softener, which will reduce

the capacity between regenerations to about 22 hours.

Caustic Soda Chemical Dosing System

Caustic soda will be primarily used in the air scrubber. Up to 5 gpm of

makeup water is estimated to be required for the scrubber, and caustic soda

will be added to the solution for maintaining a pH of approximately 10.00.

At this pH most of the H2S will be removed. This system will use Caustic Soda at a concentration of 50%. This product

will meet N.S.F. approval standards and be fed at a rate of approximately

33.6 gallons per day. Sodium Hypochlorite Chemical Dosing System

Sodium Hypochlorite is fed to the 2nd

and 3rd

stage of the air scrubber system

to assist in the breakdown of H2S. Sodium hypochlorite is used to convert

H2S to elemental sulfur. Theoretical requirements: 2.1 parts of N2OCL to one

part H2S. This system uses Sodium Hypochlorite at a concentration of 12.5%. This

product meets N.S.F. approval standards and is fed at a rate of approximately

181.2 gallons per day.


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Fe

ed

Wa

ter

Pe

rme

ate

Reje

ct

Pe

rme

ate

Reje

ct

R.O. Configuration

The RO is designed as two stages in series: The reject from the 1st

stage

becomes feed to the 2nd

stage.

RO Configuration

In the 1st

stage, there are twenty- (20) RO housings in parallel. In the 2nd

stage, there are ten (10) RO housings in parallel. Permeate from both stages

are collected in a common manifold. In every housing, there are five (4 + 1)

membranes (or elements) connected in series.

Reverse Osmosis Membranes

The Reverse Osmosis process can be regarded a filtration process on the

molecular scale. The membrane acts as a barrier to all dissolved salts and

inorganic molecules, as well as organic molecules with molecular weight

greater than 100. Dissolved salts of <100 MW are rejected according to their

ionization characteristics. Water molecules (H2O) and gases such as CO2 or

H2S pass freely through the membrane. This creates a purified product stream

known as permeate. Rejection of ionized dissolved salts is typically greater

than 98%; gases must be removed by degassing with a packed tower.


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Permeate Tube

The permeate tube is a plastic pipe at the center of the membrane perforated

with rows of holes to which the membrane leaves are glued. Water that

spirals around the permeate flow channels inside the membrane enters the

tube through the holes. To connect permeate tubes of RO membranes in

series, interconnectors are provided for that purpose. To connect the 1st

&

last RO membranes inside RO housing, a permeate end adapter is used.

Feed Spacer Brine Seal (O'ring) Inside U-Cup

Permeate Tube

Sketch of RO Membranes

U-Cup Without Brine Seal

Feed Spacer

RO Element Housings (Pressure Vessels)

RO housings are designed to accommodate RO membranes on the inside of

the housings. At each end of a RO housing, there are two connections:

"Feed/Concentrate" and Permeate.

High Service Pumps 1 & 2

Feed water enters the housing under pressure through the "Feed/Concentrate"

connection on one side of the housing (in this case, 1½" 316 SS Victaulic

Connection). The "Feed/Concentrate" connection on the other side of the

housing is used to collect reject or concentrate water, which becomes feed to

the 2nd

stage housings. Reject of the last stage is sent to the sewer system. The water that permeates through the membranes into the center tube, called

the permeate water (or product), is collected and exits from each PVC

permeate port in the middle of the housing (in this case, 1" FNPT PVC

connection). High Service Pumps # 3

One vertical turbine pumps manufactured by Johnston Pump, from 316 SS

tag # HSP 603 Model # 5KS449ST6066P complete with 225 hp high efficiency motors with

variable speed drives.

The pumps are each rated for a maximum of a 2240 gpm @ 285 ft. and 1750

rpm.


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Flushing/CIP System

Flushing/CIP System

A combined Flushing/CIP (“Clean-In-Place”) system is provided to flush &

clean the RO system. The system consists of a 316 SS CIP tank for the

preparation, mixing and recirculation of chemicals, a HDPE flushing tank

(by customer) for storing clean permeate or softened service water a HDPE

scavenger tank (by customer) for storing and neutralizing chemical cleaning

waste prior to discharge and a "cleaning skid" with pump and 5 micron

cartridge filter. The design flowrate for the CIP skid is 400 gpm. The

flushing system is used as part of the normal shutdown operation in order to

feed permeate water into the feed/concentrate side of the membrane and

eliminate any tendency to scale during shutdown.

Membrane

Interconnectors Permeate Tube

Feed

Last Membrane

Intermediate Membranes First Membrane

Permeate

Reject

Brine seal prevents brine from one side of the membranes

to mix with feed on the other side of the membranes

End Adapters

Flow Path Inside RO Housing

Permeate water travels through the permeate tubes connecting all membranes

and leaves the system from the permeate port of the RO housing where it is

collected and discharged through the permeate manifold. The water that does

not permeate the membranes, the Reject Water, is collected in the reject

Manifold and discharged to drain.

During service, the feed water enters the duty cartridge filter and is fed to the

H.P. pump suction where it is pressurized and fed to the RO system. The

pumping rate is controlled by the VFD which modulates the pump in order to

keep the permeate flow rate constant. The concentrate from the RO is also

modulated by the concentrate control valve which hold the concentrate flow

constant to achieve a recovery of 78%.


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RO Service Cycle

Hydrogen Sulfide Stripping

The acidified water from the blend by-pass and the permeate from the RO

system are both fed to individual induced draft packed towers to remove the

bulk of the H2S gas present in both streams. The inlet level of H2S can be up

to 4 ppm and in it's gaseous molecular form (at low pH), cannot be removed

by the RO membrane.

Hydrogen Sulfide Scrubbing

The foul air from the strippers cannot be discharged into the environment

because of the odor problem. The air is therefore passed through a triple

stage scrubber system to effect >99.5% removal.

This is a relatively more expensive process than stripping since all the H2S

has to be removed chemically.

The chemical doses are continuously modulated under pH control for the two

caustic soda injections and under ORP control for the hypochlorite injection.

RO Cleaning Cycle

As described before, due to the size of the RO, the CIP skid is designed to

clean this RO in three cycles:

1. The 1st

cycle consists of cleaning the 1st

seven housings in the 1st

stage

(first bank)

2. The 2nd

cycle consists of cleaning the 2nd

six housings in the 1st

stage (2nd

bank)

3. The 3rd

cycle consist of cleaning the last six housings in the 2nd

stage (3rd

& last bank)


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CIP

Fe

ed

40

0 g

pm

@ 1

25

ft

he

ad

Re

ject R

etu

rn L

ine

Pe

rmea

te R

etu

rn L

ine

A typical flowrate for cleaning of each RO-housing is 35 to 40 gpm at

maximum temperature of 35 ºC. The cleaning feed pressure should not

exceed 60 psi and must be above 50 psi.

RO Cleaning Cycle – 1st Phase Shown

1st Stage

316SS

Manifold

1st Stage

316SS

Manifold

1st Stage PVC

Manifold

PSL

123

Mov-112-1

PI

113-1

V-525

1st Stage

1st Stage

HPP 113-1

V-510

CIP Tank

T-901

Cartridge Filter

F-901

CIP Pump

CFP-901

RO Cleaning Cycle

Suitable cleaning chemicals are re-circulated through each bank of RO

membranes, and then rinsed and finally the system re-started.

The spent chemical solutions must be neutralized and then sent to the

sanitary sewer.

Finished Water Clearwell

The Reverse Osmosis permeate is gravity fed from the air stripper, blended

with by-pass raw water, and treated with sodium hypochlorite where it is

then discharged into a 46,686 gallon clearwell for immediate discharge to

Sunset Reservoir or Zone 4 of the distribution system. The clearwell is a

rectangular concrete structure located within the treatment plant facility. The

inside height is 10.08 feet. Two screened 18” overflow connections are 9.5

feet from the floor of the clearwell extending outside the clearwell with

elbows directed into a storm drain box. An appropriate air gap is provided at

the overflow discharge location. Two vertical turbine high service pumps are

installed on the top of the clearwell, one of which serves as standby. The two

pumps have the capacity of 1805 gpm and are powered by electric 150-hp

motors with variable frequency drives. Each pump is able to support the


13

maximum flow requirements through a 16” ductile iron pipe, at the design

maximum distribution system pressure of 70 psi.

A third high service pump is installed on the top of the clearwell. This third

high service pump has the capacity of 2240 gpm and is powered by an

electric 250-hp motor with a variable frequency drive. This pump is designed

to delivery-finished water to Zone 4 of the distribution system.

Plant Overview

The Plant Overview screen, as depicted below, gives a general overview of

the plant and the different areas of interest.

Plant Overview


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Plant Flow Diagram

If the operator needs to view the plant overall operational functionality the

operator will need to access the Flow Diagram screen as depicted below.

Plant Flow Screen

In this screen the Treatment Plant Summary is available for the operator to

view. The treatment plant summary gives the operator the current measured

values of some of the key parameter for the water treatment system, such as

conductivity, product flow rate and tank levels.


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Pretreatment

The Pretreatment Screen allows the most control of any of the screens

controlled by the DCS. This screen monitors many of the process parameters

such as the overall pump the flow rate, the cartridge filters differential

pressure, the NTU, conductivity, temperature and pH after the filters and the

pH of the blend.

Pretreatment Screen


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Reverse Osmosis

The Reverse Osmosis system processes can be monitored from the RO

System screen. However, no control is available from this monitor. To

access the controls for the RO System go to the control panel 103.

Reverse Osmosis Screen


17

Air Strippers & Scrubber

The Air stripper and Scrubber system processes can be monitored from the

system screen. However, no control is available from this monitor. To

access the controls for the system go to the scrubber control panel.

Air Strippers Screen


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Finished Water

The screen, similar to that shown below, is a graphical representation of the

Finished Water Tank water level. However, no control is available from this

monitor.

Finished Water Screen

Documents

Beverly Hills Reverse Osmosis Water Treatment Plant rev