Technologiesfor

water & waste water treatment

Technologiesfor

water & waste water treatment

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KWI CORP. AG designs and manufactureswater and waste water treatment equipment and systems for most industrial and municipalapplications. It is considered one of thepioneers of dissolved air flotation (DAF)technology and is the oldest existing DAFequipment builder in the world.

Founded over 50 years ago by Dr MilosKrofta as Krofta Engineering Corporation,the company started by building watertreatment and fibre recovery installations forthe paper industry. With an extensiveinstalled base, in all continents, the namehas become almost synonymous with theindustry itself.

While the paper sector still forms a signifi-cant part of its business, in the last five decadesdecades KWI CORP. AG has developed anddeployed a considerable range of water clari-fication equipment and technologies across multiple industries and applications. The company

has gradually evolved over the years tomeet these growing markets. All plantsare manufactured in our partner'sworkshop's in Europe and the Americas,

and, more recently, an advanced R & D centre inSwitzerland and the Americas.

During the early 1990’s Krofta Engineeringchanged its name to Krofta Waters Inc.and recently a new organisation, KWI CORP. AG, was formed to incorporate the companies, the people, the assets and the people's intellectual property.The main headquater of KWI CORP. AG is located in Lugano.

we know it today.Benefiting from this global networkof regional engineering groups, marketing,sales and service divisions, KWI providescustomers with research, resources, systemsand support.

People are the key to knowledge at KWI.

❏ A dedicated world-wide team ... workingin different conditions, in different markets,with different applications ... all utilisingand leveraging strong central R & D andproduct engineering ...

❏ Employing 50 years of innovative bestpractices deployed correctly each time byimpressive regional engineering teams …

❏ High qualified engineers supported bywellprepared additional technical staff working in Europe, Asia and the Americas.

KWI people provide the world’s processingindustries with proven solutions, expertlyimplemented, based on sound engineeringprinciples, technical innovation and acreative approach to liquid / solidseparation technology.

Vast process knowledge ...

Our origins ... deeply rooted in process industries ...

KWI has more than 3500 installations world-wide in a range of industries treating tens ofmillions of cubic metres of water and waste water per year ...

Extensive installed base ...

INDUSTRIES

PAPER over 1500 NORTH AMERICA over 600

SOUTH AMERICA over 450

EUROPE over 1900

ASIA/AUSTRALIA over 660

AFRICA over 40

FOOD & BEVERAGE over 1200

MUNICIPAL over 600

POTABLE & PROCESS WATER

over 50

GENERALAPPLICATIONS

over 300

MARKETS

highly specified inox metall working companies

where the founder Dr. Milos Krofta startedhis company which became a global player as

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Broad technology ...KWI CORP. AG boasts considerable success in its field. Its commitment to fully satisfy customer demands, and its study ofconstantly changing market requirements,has resulted in the development of sevenDAF clarification platforms, the mostcomplete range in the market today

Combined with extensive experienceutilising complementary technologies anda wide array of technical partnerships,KWI CORP. is ideally placed to offer the most appropriate equipment and servicessolutions to clarification and filtrationproblems.

Manufacturing quality andefficiency...The company’s dedicated manufacturingfacilities and product engineering groupare located in modern industrial premisesin Europe and the Americas. Here, all fabricationand production systems are performedstrictly in accordance with ISO 9001, ISO 9002 and ISO 14001 qualitystandards. Intimate cooperation between R & D, product engineering andfabrication ensures continuousimprovements in product function and cost.

KWI today ... technologies for a sensitive environment ...

Research & Development ...KWI CORP. has always been a creativecompany. From the original Kroftarectangular Unifloat introduced in 1947to the highly advanced SUPERCELLclarifier marketed today, the group hasconstantly innovated. This effort hasresulted in several patents beingawarded since the company wasfounded, with multiple patents pendingtoday as KWI CORP continues to respond tomarket requirements.

KWI’s regional engineering teams areready to match customers’ specific needswith its wide experience and technologydatabase, to create an innovative andefficient solution unique in the industry.

World-wide environmental awareness andessential legislation requires companies tooperate in an environmentally responsibleway. Market forces strongly reinforce thismessage ... end product users insist uponthe finest environmental credentials. It makes

strong economic sense, therefore, towork with world-class experts to deploytechnology, equipment and systems toachieve efficient, cost effectiveenvironmental goals.

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Primary treatment ...

Primary treatment involves the physicalseparation of suspended and colloidalmaterial from a water or waste waterstream. In many cases it may alsoinvolve chemical coagulation andflocculation to enhance removalefficiencies. The combination of physical-chemical treatment incorporatingdissolved air flotation clarification is oneof KWI’s specialities.

This technology is currently used in foodprocessing plants and dairies, wherefats, oils and greases must be removed,in paper production effluent, in industrialeffluent treatment, and in municipaleffluent before biological treatment ...

The choice of both process andequipment will depend on theapplication. KWI has a large installationdatabase at its disposal and this, alongwith the possibility of running pilot plantsimulations, laboratory tests andanalysis, enables the best combinationof these to be implemented.

Tannery

Environmental protection - fish processingoil recovery

Minicell™ installation, France

KWI SUPERCELL™

KWI UNICELL™

KWI SIMPLECELL

SediCone™ calciumcarbonate recovery

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Biological treatment systems reducepolluting materials in waste waterstreams by utilising micro-organisms. Thiswell established technology is alsocapable of removing organicconstituents such as ammonium,phosphorous, etc.

Today’s regulatory pressures requireeffluent plants to perform better than everbefore. Many industries havetraditionally relied on primary treatmentprocesses only for their waste watertreatment. This has performancelimitations and may not remove sufficientamounts of polluting material to asuitable level to meet discharge consentsor allow water recycling.

KWI biological treatment systems aredesigned generally for particular casesof industrial effluent treatment whereconventional solutions are not applicableor are inappropriate.

Combinations of primary physical-chemical pre-treatment and continuousbioreactors or SBR systems have beensuccessfully used in many difficult cases.

Biological treatment ...

Activated sludge plant

SBR plant, cheese factory, France Suface aerator SBR plant, vineyard, France

Sequential batch reactor (SBR) -rubber manufacture

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Biological sludge clarification & thickening ...Sometimes traditional settlement clarificationafter the bioreactors can be quite difficultand unstable. The reason for this varies -high concentration of salts in the effluent,particularly ‘light’ biomass, de-nitrification inthe secondary clarifiers, sludge bulking or ahost of other reasons.

Dissolved air flotation is a good alternativeto sedimentation in these cases. It allows theuse of significantly higher biomassconcentration in the bioreactors savingconstruction costs, volume and, therefore,space.

Excess biomass is also removed in the formof sludge in the biological treatment stage toallow further biomass growth. The thickeningof this sludge before de-watering is anothercommon application for DAF technology.

KWI’s Sedifloat™ clarifier is designedprimarily for biological sludgeclarification and thickening applications.Combining settlement and flotation, aspecific hydraulic design and sludgerecovery facility allows a deep sludgeblanket to be built up for optimumclarification and better sludgethickening. A floated sludge consistencyof up to 6% is currently achieved withsmall amounts of flocculant being onlyoccasionally used to cover peakhydraulic and solids loadings.

Biological sludge thickening, dairy, Croatia.

Biological sludge thickening,municipal plant, France

Sludge thickening, France

Biofilter backwash waterclarification and

sludge thickening

KWI SEDIFLOAT™

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Fine clarification & water polishing ...

Tertiary treatment or ‘polishing’ applicationsare more and more necessary to improvefinal effluent quality after biological treatmentfor either discharge or recycling.Phosphorous precipitation and additional‘hard’ COD removal is also a growingneed.

The KWI Sandfloat DAFFI clarifier removes finesuspended solids utilising flocculation,dissolved air flotation clarification anddouble media sand filtration in one unit,ensuring the highest efficiency coupled witheconomical and simple operation.

For smaller flows, KWI also supplies the KS-Filter™, a continuous back-washinggravity sand filter using an airlift pump to liftdirty sand from the bottom to the sandwashing chamber at the top.

Tertiary effluent, irrigation

KS - Filter™industrial tertiaryeffluent

Potable Water

KWI KS - FILTER™

KWI SANDFLOAT DAFFI ™

Potable & process water clarification ...Traditional methods of producing potableand high quality process water involveseparate primary clarification and filtrationstages to remove organic and inorganiccontaminants.

With the KWI Sandfloat™ clarifier, both canbe combined in one compact unit andsuccessfully employed for municipal orindustrial use, especially in cases wherehigh suspended solids concentration in theraw water occur. This is the case whensurface water containing algae or otherorganic and inorganic materials, givingoccasional or permanent turbidity, is treated.

The combination of DAF clarification, withthe capacity to remove significant amountsof solids, along with fine double mediasand filtration, giving excellent filtrationquality in a single clarifier, is a reliable andeconomical solution for these applications.

Sandfloat™ - drinking water

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Process applications ... KWI is strategically placed to serveprocess industries world-wide, with itsequipment and systems becoming, inmany cases, an integral part of theproduction cycle. Typical processindustry applications includepetrochemical, rubber manufacture andplastics recycling, paper and boardmanufacture, non-wovens, and many,many more.

Petrochemical industries generally havespecific requirements concerningequipment quality and particularmanufacturing procedures, whilst rubberand plastics industries are often locatedin dry countries with poor waterresources. They require significantrecycling of raw materials from theireffluent.

Petrochemical plant, North Africa

Non - wovens high pressure needle spray water recycling

Simplecell installation for commercial vehicle washing plant water recycling, Hong Kong

Denim dyeing plant effluent treatment

Effluent treatment and waterrecycling project,

rubber manufacture

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... paper industry ...

Supercell™ - effluent treatment, Finland

Supercell™ - tissue machine,white water

Megacell™ - tissue deinking

KWI SimplecellVertical

KWI SimplecellHorizontal

Paper industry experts with extensiveknowledge of this specialised processprovide solutions to system and effluenttreatment problems created throughoutthe paper making process.

Individually treated short loops in thepaper mill generally achieve the bestimprovements in terms of raw materialand fresh water cost savings and includesuch areas as :-

❏ paper machine whitewater❏ paper machine deinking wash water❏ reject streams❏ raw water❏ press filtrates❏ TMP filtrates

Other paper industry applications forKWI systems and equipment include :-

❏ Deinking plant❏ Pulp manufacture❏ Non-woven products

Vertical Megacell™ MCV20operating on washer filtrate in newsprint mill

Vertical Simplecell™ MCV60 under construction at fine paper mill

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Engineered process solutions ...KWI doesn’t just install equipment ... itinstalls guaranteed engineered solutions towater and waste water treatment problems.Its customers’ needs are always individualand often unique.

Its comprehensive range of equipmentprovides a strong technology core, whilst itsR & D group working with process andproject engineering form a total solutionteam that ensures the most appropriate

approach to each and every challenge.

This specialised team has capabilitiesranging from process consulting todeveloping customised equipment. Itprovides complete project engineeringincluding process selection, purchasing,construction and commissioningmanagement, and a full range ofinstallation services, to guarantee plantconformity and process verification.

Colour removal, textile plant

Turnkey project, paper

Turnkey biological treatment, environmentally

sensitive site, France Surface aerator showing floats

Pressurisation,ADT installation

Turnkey effluent treatment project,tissue mill, United Kingdom

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Manufacture, installation & commissioning ...

KWI provides technology and buildsequipment and systems on a global basis.Its major manufacturing and fabricationplant, of over 7000m2, is situated in Italy.Here a team of over 60 expert engineersand manufacturing specialists combine thebest of both traditional and digitalproduction skills allowing the simultaneousconstruction of many plants with shortdelivery times.

Continuous research and developmentprogrammes at KWI CORP. help it remain at the forefront of innovative technology for today’swater and waste water treatment. The Europeanand the Americas plants also maintains fabrication and test facilities for the many prototypesdesigned by the R & D group.

Additionally, its engineering capacity allowsit to offer a comprehensive service facility forboth its own and other suppliers equipment.Maintenance, downtime repairs, fabricationof tanks and vessels, machinery alignment orgeneral engineering services can all beprovided through its global network.

KWI CORP. spares, too, are held at variouslocations throughout the world to enableessential service and wear parts to beshipped to customers without delay.

KWI CORP. AG - Via Baroffio 6 - CH 6900 Lugano / SwitzerlandPhone +41(0)91-913 4444 Fax +41(0)91-913 4440 mailto: kwi.sa@bluewin.ch, www:krofta.ch

KROFTA WATERS INTERNATIONAL