water production and treatment

8/11/2019 Water Production and Treatment

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A G L O B A L S O L U T I O N

F O R W AT E R P R O D U C T I O N A N D T R E AT M E N T


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Johnson brings together all the competencies

and the know-how needed for the completion

of wells, and supplies a complete range of

products for the well and its environment.

From the exceptional performance of the

Johnson screen for optimum exploitation

of complex aquifer to the spun rib screen

with oblong or round holes, Johnson

offers a wide diversity of high-performance

solutions incorporating all the fittings

necessary for the completion of water

wells.

Johnson was established more than a century ago, when it invented the first wire-wrapped well screen: an innovative product, which

considerably improved the effectiveness and the yield of water wells. Since then, its experience and its expertise have been extended to

other water-related applications, and its technology enables it to satisfy all filtration and separation requirements related to the extraction

and treatment of water.

The diameters available range from

50 mm (2") for drive points designed for

dewatering work sites, to 900 mm (36")

for high flow-rate wells.

The manufacturing materials are

common weldable metals such as stainless

steels, black steel or galvanized steel. For

shallow wells on low budgets, continuous

slot or perforated PVC screens can be

supplied. PVC pipes and extension pipes

are also available.

Slot width starts at 100 and slots are

designed to adapt perfectly to any type of

formation, from silty clays to coarse gravels.

Thanks to the large open area of the

screens, water is pumped at low entrance

velocities, with low head loss and energy

consumption.

Various additional products associated

with water wells complete the range to

provide a global solution: threaded

connections and other fittings,

i n no va t iv e c h em i ca l t re a tm en ts ,

biodegradable drilling mud, hydrometry

instruments, etc.

A qualified and experienced team

is ready to give you advice and service in

order to help you define the equipment

best suited to the geology and hydro-

dynamics of your well.

JOHNSON: A COMPLETE SOLUTION FOR WATER WELL EQUIPMENT

W A T E R W E L L

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Wire-wrapped screen


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Thanks to its innovative hydraulic design (patented), the Johnson water intake screen provides reliable maintenance-free operation with

complete protection of fauna and flora, even in shallow water, with no waste management.

Its main advantages are as follows:

Low investment cost - the water

intake is connected directly to the pumps

suction pipe. The absence of civil engineering

considerably reduces the cost and delay

of water intake projects.

Low maintenance - Johnson water

intake systems are robust and have no

moving parts. Their design prevents clog-

ging, and the materials used resist corro-

sion and biofouling.

Protection of the environment - The

flow rate through the screen is so low that

neither flora nor fauna can be dragged

into the system.

Easy cleaning - The compressed air

backwash system is controlled remotely

and does not require any underwater

maintenance.

No waste management - During back-

wash operations, waste is carried away by

the current.

Optimum adaptability - Each intake

screen is designed to adapt to the specific

conditions of the site, taking into

consideration:

1. the nature of the water (material

selection in order to obtain optimum

resistance to corrosion and to biofouling),

2. the dimensions of the particles that

need to be stopped (selection of the

slot-3 mm on average),

3. the characteristics of the watersource (flow rate, depth, current) and

the available space (S or T type

intakes).

S U R F A C E W A T E R E X T R A C T I O N

JOHNSON: A SELF CLEANING INTAKE SCREEN

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Multiple installation

Intake Screen withAir Backwash System

(HydroburstTM

)


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JOHNSON: COLLECTORS AND DISTRIBUTORS FOR PRESSURE F ILTERS

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Headerlateral

System

Support

Grid

P R O D U C T I O N O F I N D U S T R I A L W AT E R

Johnson screens can be used for many

types of processes carried out by water

treatment systems.

This includes activated carbon and resin

retention processes, demineralisation, ion

exchange or even pressure filtering.

In these applications, Johnson screens

collect or distribute the treated solution,retain the filter bed, distribute the wash

solution or trap suspended solids.

The screens are the ideal technological

choice thanks to their excellent adaptability,

their high effectiveness, their minimal

maintenance and their longevity.

For all these processes there is a wide

selection of filtration and separation internals:

Header laterals, with branches specially

designed to eliminate dead zones in in the

treatment medium.

Resin traps, with a large open area

and the capacity to withstand very high

differential pressures,

Support grids, easy to install, needing

only minimal additional support structures,

Filter bottom nozzles (stainless

steel or ABS), for simplified installation

and excellent performance,

Precoat filters, providing very fine

filtration while benefiting from the robustness

and longevity of welded steel screens.


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The TRITONTMsystem is the ideal alternative to filter bottoms with nozzles. The stainless steel TritonTM system provides toughness and

maximum open area to optimize the effectiveness of treatment installations.

JOHNSON: INNOVATIVE EQUIPMENT FOR GRAVITY SAND FILTERS

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P R O D U C T I O N O F D R I N K I N G W AT E R

Installation of the TritonsTM

Versatility - Adaptability

The simplicity of its design means that the

TritonTM system adapts easily to existing

filters. As it does not need any space

between the concrete base and the drains,the TritonTM system allows the depth of the

medium to be increased in the case of filter

rehabilitation.

Installation is simple and rapid.

Functions

TritonTM is designed to provide an overall

response to the numerous problems

involved in drinking water filtration, and

offers the following advantages:

maximum filtration surface area,

very wide coverage of the filter bottom

(optimization of drainage),

direct retention of the filter medium

(no attrition of activated carbon particles),

very fine filtration cut-offs (> 150 ),

highly effective washing (air/water),

several layers of filter media can be

used without risk of disturbance.

Savings

higher filtration speed,

operation energy savings,

increased filter productivity (m3/m2/cycle),

thus potentially smaller dimensions for

a given throughput,

zero maintenance, so no expensiverepairs or production shutdowns,

toughness and durability thanks to the

semi-circular shape of TritonTM and the

quality of the materials used,

Easy and quick to install.

Filter equipped

with TritonsTM


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JOHNSON: STATIC, ROTARY & VIBRATING FILTERS

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W A S T E W A T E R T R E A T M E N T

Sludge thickening drain

Rotary drum : improvessolid removal and water content

Static, rotary or vibrating equipments are

often fitted with Johnson screens in the

food processing and mining industries, as

well as in the pulp and papermills and

sewage treatment plants. Screening

drums, curved grids and high-performance

trommels are particularly suitable for

these kinds of industrial application.

In addition to the advantages mentioned

above in the description of our water

intakes (robustness, reduction of the risk

of clogging, lifetime, etc.), Johnson

screens have the following main assets:

Improved system capacity thanks to

the large filtration area,

Higher water removal rate in baskets

and drums and on curved screens thanks

to the sharp edges of the profiled wire,which enables better separation of the

liquid and the particles to be retained,

Resistance to corrosion and abrasion,

Simplified mounting procedures due

to an all-welded construction,

Custom design, according to the

specifications of each customer; depending

on the function of the screen, its

construction enables filtration either from

the inside to the outside or from the

outside to the inside,

Small openings, from 25 . The slots

can be longitudinal or peripheral.


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JOHNSON: THE CORE OF THE SYSTEM IN THE AUTOMATIC FILTERS

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F I L T R A T I O N

The very robust, fully-welded construction

of Johnson continuous-slot screens gives

them much greater durability than disposable

filter cartridges made of fabric, PVC,

paper, cellulose or metal mesh.

This characteristic enables them to be

incorporated into automatic filters and to

withstand vigorous cleaning (even with

scrapers) and repeated backwashes without

any damage, while reducing the quantity

of waste to be treated.

The manufacturing features of the screen

and the properties of its V-wire are such

that the particles do not clog the slots and

cleaning is made much easier.

Johnson filter cartridges are available with

openings as small as 25 for very fine

filtration applications. These cartridges

can also be used as supports for filter

membranes. The common manufacturing

materials are 304 and 316L stainless

steels ; other alloys are available on

request.


8/8www.johnsonscreens.com

JOHNSON SCREENS - USANouth & South AmericasTel : +1 651 636 3900Fax : +1 651 638 3171

JOHNSON SCREENS - AustraliaAsia PacificTel : +61 7 3867 5555Fax : +61 7 3265 2768

JOHNSON SCREENS - FranceEurope - Africa - Middle EsatTel : +33 (0)5 4902 1600Fax: +33 (0)5 4902 1616

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F I E L D S E R V I C E

Because the effectiveness and the reliability of the equipment also depends

on the quality of its installation, Johnson has chosen to make available to

its customers a team of experienced technicians in order to assist them in

the installation of the equipment, supervision of the installation or straight-

forward technical assistance.

A custom package is defined in order to optimize the system while meeting

the customers specifications.

This is just a brief overview of the filters and screens that

are the most commonly used in water treatment industries.

Custom solutions can be designed to target the specific

needs of your application.

water production and treatment

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