Decanter centrifuges
Onze decanteertanks zijn uniek, functioneel en veelzijdig. Ze zorgen voor een uiterst efficiënte afscheiding van zelfs de kleinste vaste deeltjes, waarbij de vloeibare fase vrijwel volledig wordt geklaard.
Water is one of the most valuable resources on Earth. Global environmental awareness, the desire for sustainability, and the focus on conserving and protecting our water supplies are steadily resulting in more environmental regulations and stricter rules regarding the use and disposal of water in industry.
The machine solutions developed by SIEBTECHNIK TEMA for Zero Liquid Discharge (ZLD) projects are used in many industrial sectors to purify or recycle process water and to recover valuable substances from wastewater.
The Earth’s resources are finite. For decades, knowledge of this scarcity of resources and raw materials has led to the sustainable recovery of recyclable materials, which are then returned to the value chain.
Water is particularly significant here.
Only 2.5% of the water on Earth is fresh water. Only a small part is really accessible to humanity, namely 0.3% (in lakes, rivers and reservoirs).
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Sustainable resource saving
But demand for high-quality water is increasing, driven by ecological changes, environmental factors, the growing world population, and increasing urbanization. This fact has led to greater environmental awareness worldwide regarding the availability and quality of water. As a result, there are increasingly stringent government regulations regarding the disposal of industrial wastewater.
Due to scarce water resources, and rising costs for water treatment and wastewater disposal, the use and conservation of water is a key issue in the manufacturing industry around the world. The focus here is often on repeatedly using treated water and reducing wastewater volumes, and even on avoiding wastewater entirely. Demand for new and increasingly efficient recycling technologies is growing, especially in regions that have limited access to available water sources and wastewater disposal options.
The benefits of Zero Liquid Discharge (ZLD)
In order to increase the environmental friendliness of industrial plants, ZLD is used in a wide variety of fields, e.g. in power generation, and in the steel and chemical industries.
ZLD improves the environmental and economic footprint of a plant. Firstly by reusing water, and secondly by avoiding the discharge of wastewater, which could incur high costs or damage the environment. In this way, ZLD helps companies comply with strict regulations and guidelines regarding wastewater disposal and water reuse, as well as protecting the local environment.
In addition, ZLD enables the recovery of valuable resources from wastewater, which can be reused in the industrial process or sold.
ZLD – How wastewater treatment sustainably conserves valuable resources.
Zero Liquid Discharge helps to:
- Protect the environment and water resources
- Fulfill government regulations
- Achieve higher levels of water recovery
- Reduce wastewater volumes
- Reduce costs
- Recover salts from wastewater (e.g. potassium sulfate, sodium sulfate, sodium chloride, lithium salts, mixed salts)
Industries that use ZLD include e.g.:
- Pharmaceuticals
- Chemicals
- Oil, gas & refineries
- Power generation
- Steel & mining
- Cellulose & paper
- Tanning & textile dyeing
- Beverages & food
- Drinking water treatment
- Agriculture
What is ZLD?
Zero Liquid Discharge (ZLD) is a treatment process focused on the economical reduction of wastewater. This produces clean water suitable for reuse, saving money and protecting the environment.
ZLD systems utilize advanced wastewater/ desalination technologies to treat and recycle virtually all the wastewater generated. In this process, the components dissolved in the water are converted into reusable solids such as sludge and salt. Different technologies are typically combined, such as thermal evaporation, crystallization, desalination and drying, and centrifugal separation.
The ZLD process
The first step is to filter or precipitate waste and chemicals that are easy to remove. The wastewater is then concentrated by means of evaporation. In the third step, the concentrated waste stream is fed into a crystallizer.
In the last and decisive step, this suspension of water and crystallized solid is separated using a centrifuge. The efficiency of the upstream steps matters little; it is the use of the right centrifuge that determines the overall efficiency of the plant.
ZLD process – The various purification steps to make both the water and the valuable substances it contains usable again
Centrifuges for Zero Liquid Discharge (ZLD)
Solid-liquid separation is the critical final step in most ZLD processes, as this is where the remaining water is separated from the solids, in most cases salts. Dewatering is mostly done with decanters, SHORTBOWL decanters, pusher centrifuges and CONTURBEX centrifuges. For dewatering coarse residue, our HSG vibratory centrifuges have proven effective.
Finer mixed salts from crystallization plants are centrifuged using downstream SHORTBOWL decanters, SHS pusher centrifuges and CONTURBEX centrifuges at temperatures sometimes exceeding 100°C. The high-alloy stainless steels, Hastelloy® and titanium materials required for these machines are provided with appropriate wear protection made of tungsten carbide, Stellite® or ceramic tiles.
Slijtagebescherming
De centrifuges van SIEBTECHNIK TEMA zijn speciaal geoptimaliseerd voor de betreffende scheidingstaak. Bij de materiaalkeuze hebben austenitisch en ferritisch roestvast staal zich bewezen in de centrifugebouw voor toepassingen onder normale belasting.
Voor processen waarbij schurende materialen worden verwerkt, moeten de centrifuges worden voorzien van een effectieve slijtagebescherming. Al sinds 1922, toen we begonnen met de verwerking van steenkool, hebben we slijtagebeschermingssystemen continu verder ontwikkeld.
Onze centrifuges kunnen worden uitgerust met geavanceerde slijtagebeschermingssystemen van bijvoorbeeld wolfraamcarbide, Stellite® of keramische tegels, om er maar een paar te noemen. Rubber- of matrixcoatings hebben zich ook bewezen in diverse toepassingen.
Indien nodig ontwikkelen onze ingenieurs nieuwe en efficiënte oplossingen op het gebied van coating-, hecht- en verbindingstechnologie voor onze klanten wereldwijd.
Materialen voor centrifugeonderdelen
Centrifugeonderdelen moeten niet alleen bestand zijn tegen hoge krachten, maar ook tegen procesgerelateerde belastingen zoals corrosie, slijtage en hoge temperaturen. Ook de kosten en de beschikbaarheid van materialen spelen een belangrijke rol. Onze klanten kiezen de benodigde materialen die in contact komen met het product op basis van deze zeer specifieke eisen.
Duplex- en hooggelegeerde roestvaste staalsoorten, Hastelloy® en titaniummaterialen voor een breed scala aan processen en belastingen maken deel uit van onze dagelijkse praktijk in de centrifugebouw. Ons kwaliteitsmanagement heeft zeer gedetailleerde en kosteneffectieve processen ontwikkeld voor ontwerp, fabricageprocessen en het testen van componenten op basis van Europese richtlijnen.
Typische plaatwerk- en smeedmaterialen voor componenten die in contact komen met vloeistoffen in centrifuges zijn onder andere
- EN 1.4404 / AISI 316L
- EN 1.4571 / AISI 316Ti
- EN 1.4462 / AISI 318LN / Duplex
- EN 1.4410 / AISI F53 / Super Duplex
- Lean Duplex
- EN 1.4539 / AISI 904L
- EN 1.4547 / 254SMO®
- EN 1.4529 / AISI 926
- EN 2.4819 / INCONEL® Alloy C-276
- EN 2.4602 / Hastelloy® C22
- EN 2.4610 / Hastelloy® C4
- EN 3.7035 / Ti-II / Titan 994-Ti-grade 2
- EN 3.7235 / Ti-IIPd / Titan 994 Pd-Ti-grade 7
- and their casting materials
Elk proces en elke klant heeft zijn eigen specifieke eisen.
SIEBTECHNIK TEMA beschikt over een uitgebreid assortiment aan systemen en componenten, centrifuges en drogers die zijn afgestemd op uw behoeften.
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Lees meer over deze toepassingen.
SHS pusher centrifuge
The SIEBTECHNIK TEMA SHS pusher centrifuge has established itself and proven itself as a modern high-performance unit in many industries.
Screen scroll centrifuge CONTURBEX
The CONTURBEX is a continuously operating, filtering centrifuge with a very wide range of applications.
HSG vibrating centrifuge
With the SIEBTECHNIK TEMA HSG vibrating centrifuge you can continuously centrifugally dewater the world's largest solids capacity of bulk materials.
SHORTBOWL decanter centrifuge
Due to the special geometry of the rotating parts, the SHORTBOWL decanter centrifuge - solid bowl is best suited for separating fine solid particles with a high specific density difference to the liquid phase.
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