Water preparation

The water that is supplied by public companies (or private sources) can never be cleaner then the polluted environment we are living in. We can recycle the water with preliminary filtration or ultra-filtration, ion exchange and reverse osmosis, depending on economical justification and ecological reasons.

Projects for preparation and purification of the water are based on up-to-date concepts implementing the latest technological findings. They are energetically optimal, reliable and user friendly.  All processes are monitored at the central control of the factory or on the Ethernet (omrežje), so all important information can be reached from anywhere.
For better understanding of water purifying process, we present the next example:

An example of complete water preparation for use in production of starch and syrups – 2007

The source of raw water is drinking water from the system and water from wells.
In the incoming raw water forbidden components are present and we eliminate them in several stages of water preparation.

- classical filtration - anthracite filters for removing impurities,
- deferisation, demanganisation, elimination of arsenic,
- countercurrent softening for  intermediate needs of production with final UV disinfection,
- ultrafiltration,
- reverse osmosis.

In the intermediate stage the product is soft water and in the final stage demi water with 10 μS/cm conductivity. It is used for production and for making steam in low pressure steam boilers. For reducing conductivity under 0,1 μS/cm
a membrane degasser and electrodeionisation is built in. This water is used for steam turbines in electrical energy production.

The ultrafiltration device is cyclically washed with chemical additives - acid, lixivium + disinfectant, so batch neutralization of waste waters is built in.

In continuation you will find the description of the block diagram which represents technological process and capacities.

Technological/technical data:
permeator with conductivity under 0,1 μS/cm - 50 m3/h
permeator with conductivity under 10,0 μS/cm - 25 m3/h
softened water with total hardness under 0,5 odH - 40 m3/h
electrical power of the first stage equal to 170 kW

Approximate utilization rate of the devices - quantity of waste waters:
sand filtration: under 90%
catalyst - filter: under 99%
softening device - countercurrent on raw water: under 97.5%
ultrafiltration: under 96%
reverse osmosis under 75%
EDI electrodeionisation: under 97%

Media consumption:
- Natrium Chloride - in tablets 153 kg/reg
Other chemicals are periodical in disinfection, cleaning Uf and RO membranes, pH correction. They are minimal and do not influence the operating cost of the plant significantly.
The process is monitored and operated centrally, therefore there is no need for a constantly present operator.

Equipment and materials we use for this technology:
GFK- polyester pressure vessels for filters
- PVC pipe installations, AISI 316 stainless steel for reverse osmosis, pre-filters, etc.
- stainless valves with pneumatic drive
- magnetic induction flowmeter
- continuous measurements of pressure, conductivity, pH, Rx, turbidity, etc.
- the pumps are stainless, with frequency control
- membrane modules on UF are polysulfonic with permeability of 0,02 μm
- intermediate reservoirs - polypropylene

Conclusion
Projects for preparation and purification of water are based on up-to-date concepts implementing the latest technological findings. They are energetically optimal, reliable and user friendly.  All processes are monitored at the central control of the factory or on the Ethernet, so all important information can be reached from anywhere.

Water preparation for use in synthetic fibres production/deferisation
up to 27,0 m3/h, Central microprocessor control with Allan Bradley (2003)

Water preparation for use in non-alcoholic drinks production with deferisation and ion exchange
up to 18,0 m3/h, Central microprocessor control with SIMATIC S7 (2003)

Clean water preparation for different users with ultrafiltration, ion exchange, UV disinfection, membrane degassing
up to 4,0 m3/h, Central microprocessor control with SIMATIC S7 (2003)

Preparation of ultra clean water for use in medicine production with reverse osmosis, UV disinfection, membrane degassing, electrodeionisation in recirculation
up to 1,0 m3/h, Central microprocessor control with SIMATIC S7 (2003)

Microprocessor controlled water preparation for use in oncological hospital in Ljubljana
- softening device 12m3/h
- reverse osmosis with membrane degassing and electrodeionisation 3 m3/h
- recirculation loop 2 m3/h
Central microprocessor control with Allan Bradley (2002)

Microprocessor controlled softening device with countercurrent system for technological use in textile industry
up to 2x30,0 m3/h, Central microprocessor control with Allan Bradley (2002)

Ultrafiltration of drinking water from the system, preparation of sanitary water with reverse osmosis for watering existent and new plants in pharmacy
up to 36,0 m3/h, Central microprocessor control with SIMATIC S7 (2001)

Preparation of demi water with filtration, reverse osmosis absorptive filtration and additional softening for use in steam boiler house, CIP and juice production
up to 14,0 m3/h, central microprocessor control with Allan Bradley (2000)

Preparation of demi water with reverse osmosis and pre-softening for technological water use
up to 1,0 m3/h, Local microprocessor control (1999)

Preparation of ultrafiltrated water with softening and degassing CO2 for use in PV (purified water) preparation
up to 3,0 m3/h, central microprocessor control with Allan Bradley (1999)

Preparation of demi water with reverse osmosis - recirculation of galvanic waste water, with preparation of watering water from well water with deferisation, filtration and softening
up to 18,0 m3/h, central microprocessor control with Allan Bradley (1999)

Preparation of demi water with reverse osmosis and softening
up to 12,00 m3/h, central microprocessor control with SIMATIC S7 (1999)

Preparation of demi water with reverse osmosis for shampoos
up to 4 m3/h, automatic with local control, stainless version with UV disinfection (1998)

Preparation of demi water with reverse osmosis for hair cosmetics I
up to 2 m3/h, automatic with local control (1997)