Exterior View of Fully Containerised TransPAC Dosing Solution
Powdered Activated Carbon (PAC) is often added to drinking water supplies to remove Pesticides (such as Metaldehyde), odour and taste to meet the current legislation requirements.
Many of our clients also experience seasonal issues with 'Algae Bloom' for which the containerised TransPAC dosing systems is an ideal solution. For example, the TransPAC system can be taken from site to site as and when issues arise, giving our clients the ultimate in flexibility, without high CAPEX.
Problem
Traditionally PAC has been added into a batch dosing system incorporating mechanical agitators, tanks and slurry pumps. However, as PAC is only required at certain times of the year this can lead to unreliable operation because residual slurry left at the bottom of the mixing tanks can dry to form large solids and slurry can settle out within the dosing lines and pumps on shut-down. This can result in system blockages and costly maintenance at a time when PAC is needed.
Solution
Interior View of Fully Containerised PAC Dosing Solution
with Spiroflow Bulk Bag PAC feed option
Our 'TransPac' PAC dosing systems offer a reliable and simple method of producing PAC slurry on demand at varying powder flows to match the process requirements.
TransPac PAC dosing systems are split into two distinct areas:-
Dry powder metering
Mixing & slurry dosing
PAC dosing control is handled by the dry powder system and the Eductor system is used to mix and deliver the PAC slurry to the designated works discharge point.
Interior View of Fully Containerised PAC Dosing Solution with Spiroflow Bulk Bag PAC feed option
Algae bloom problems easily solved by TransPac Dosing Solution
Algae Bloom
Algal blooms occur when the nutrients getting into surface waters cause rapid growth in the algae present in the water. Algal blooms have caused sporadic problems in water treatment processes for decades. When water abstracted for drinking water treatment contains algal blooms, blockages can occur in filters and odours may develop in the treated water.
A simple solution to control Algae bloom is adding required levels of powdered carbon (PAC) to the water. Transvac offers a range of dosing solutions, including the containerised TransPAC system.
Accurate dosing no PAC wastage
Clean and reliable operation
Once through in-line mixing
Dosing lines flushed clean after use
No wet mixing moving parts
Minimal maintenance
Simple to install and operate
Hygienic design
Manual or fully automatic operation
Compatible with site telemetry
Lime Dosing
Transvac has supplied thousands of units to the water treatment industry. Using liquid as the motive force Transvac Jet Pumps can accurately entrain, mix and dilute a secondary liquid, eliminating the need for mechanical dosing pumps and mixers.
Liquid Jet pump for acid dilution on
water treatment works (PVCu internals
and steel support shell)
Transvac has supplied thousands of units to the process and allied industries. Using liquid as the motive force Transvac Jet Pumps can accurately entrain, mix and dilute a secondary liquid, eliminating the need for mechanical dosing pumps and mixers.
In operation a high velocity jet of pressurised liquid discharged from the motive nozzle produces a region of low pressure in the suction chamber that entrains the secondary liquid. The two streams then thoroughly mix in the throat before the resulting mixture flows through the diverging cone to regain some pressure in order to overcome system discharge heads.
Typical Applications
Acid / caustic dosing system
for power station water treatment plant
Chemical Dosing & Dilution
Polyelectrolyte Production
Ion Exchange Resins
Activated Carbon / Lime
Sludge & Slurry Handling
Advantages
Simple and reliable
No moving parts
In-line mixing
Custom designed
Materials to suit process
No maintenance
Single units or complete skid mounted packaged systems are available, each unit is designed to specific process conditions. Standard materials of construction include rubber-lined, PVCu, PP, PTFE, PVFD, hastelloy, titanium, stainless steel and carbon steel. Connections included flanged, screwed, plain, hosetail, bauer and quick-release etc..
A versatile method of entraining, mixing and pumping solids into liquids. The Venturi principle offers many advantages over other types of high shear mixing equipment on the market. Robust and highly reliable with no moving parts to wear, the units are virtually maintenance free.
Available in either stationary, portable or mobile models the custom designed Liquid Jet Solids Pump (LSP) units can be supplied as individual items or complete skid mounted systems including motive pump, valves etc. Powder can be loaded manually or automatically using screw feeders at ground level, thereby keeping powder handling at a minimum. In many cases fluid energy from existing pumps can be used which eliminates the need for additional power.
Mobile 'LSP' for handling ion exchange resin
on a water treatment plant
Advantages
Reduced powder handling
No moving parts
Complete mixing of powders and liquids
Materials to suit process
Low level operation
Reduced batch times
No maintenance
Existing pumps can often be used
Depending upon the process conditions operation can be on a once-through or recirculation basis.
Materials of construction can be varied to suit the process environment. Stainless steel, carbon steel, polypropylene, PTFE and other materials are available with connections to suit. For food and pharmaceutical applications units can be designed to comply with stringent hygiene requirements using polished stainless steel and sanitary fittings.
Transvac Tank Jet Mixers are a mass momentum exchange device which uses the energy of pressurised liquid to entrain, mix and pump a secondary liquid. The principle is used for many process applications including blending, solids suspension, dilution and heat distribution
In operation, pressurised motive liquid is discharged through the jet nozzle into the suction chamber. The change from pressure energy to kinetic energy (velocity) creates a region of low pressure that entrains liquid from within the process vessel via the open suction ports. The motive and suction liquid streams combine and mix under high shear conditions in the venturi diffuser. The resulting mixture is then discharged into the bulk of the process liquor as a high velocity turbulent jet.
Standard Transvac Tank Jet Mixers entrain 3 parts suction liquid for every 1 part motive liquid with the discharge jet of 4 parts inducing further secondary mixing.
Advantages of Jet Mixers
Tank Jet Mixers for Mixing Varnish
in a Road Tanker
No moving parts
No splashing or aerosol created
Operates at variable depths
No bridges or bearings used
No in-tank maintenance needed
Evenly distributes mixing
Controllable mixing
Simple, reliable and robust
Each Tank Jet Mixer is designed to suit the process mixing requirement and single Mixers or a number of mixers mounted on an intank manifold are available. Transvac can offer the basic mixers or a complete system including pipework, pumps and valves.
Materials of construction are chosen to suit the process conditions, common materials include stainless steel, carbon steel, Polypropylene, PVCu, PTFE, and GRP. Hygienic designs are available for the food / pharmaceutical industry
Liquid Jet Compressor in PVCu
with galvanised mild steel flange connections
Transvac Liquid Jet Compressors have been extensively used for entraining ozone and atmospheric air in water treatment applications.
Using liquid as the motive force Transvac Jet Compressors can accurately entrain and mix air or gas in-line and discharge against a back pressure.
Principle of operation
In operation a high velocity jet of pressurised liquid discharged from the motive nozzle produces a region of low pressure in the suction chamber that entrains the secondary gas. The two streams then thoroughly mix in the throat before the resulting mixture flows through the diverging cone to regain some pressure in order to overcome system discharge heads.
Advantages
Liquid Jet Compressor in PVCu with screwed union connections
Simple and reliable
No moving parts
In-line mixing
Custom designed
Materials to suit process
No maintenance
Standard materials of construction include rubber-lined, PVCu, PP, PTFE, PVDF, hastelloy, titanium, stainless steel and carbon steel. Connections included flanged, screwed, plain, hosetail and bauer.
Twin barreled, self aspirating, through-wall mounted
Venturi Aerator installed in an activated sludge plant.
Transvac Venturi Aerators are a mass momentum exchange device which uses the energy of pressurised liquid to entrain, mix and pump air into a secondary liquid.
Standard self aspirating units can operate at tank depths of up to 7 metres and offer typical efficiencies between 1.2 and 1.8 kg02/kWh at standard conditions. High alpha factors, simplicity, reliability and low cost make the Transvac Venturi Aerator a competitive with other forms of aeration equipment available on the market.
The action of the Venturi Aerator makes it particularly suited to processes that require directional mixing, such as in 'race-track' type oxidation ditches or in-line aeration packaged sewage treatment plants.
For tanks deeper than 7 metres Blower assisted or high pressure aerator models are available.
Through-wall twin venturi aerator.
Advantages
No moving aerator parts
High oxygen transfer
High alpha factors
Minimal maintenance
Virtually silent operation
No aerosol spray
Simple to install and retrofit
Materials to suit the process
There are four standard configurations of Transvac self aspirating units :
Free standing
Floating
Through-wall
Guide rail mounted
Principle of operation
Free standing self aspirating Venturi Aerator
installed in an oxidation ditch
In operation, recirculated liquid is pumped from the process tank and into the aerator where it is accelerated through the patented vortexing nozzle. This results in an area of low pressure and high velocity into which air is drawn. The two streams intimately mix before discharging as a turbulent plume creating horizontal and vertical mixing patterns across the process tank.
Materials of construction
Standard Venturi Aerator materials include stainless steel, carbon steel, PVCu and Polypropylene. Pumps and ancillary equipment materials are selected to suit the process conditions.
Free standing, self aspirating, Venturi Mixer / Aerator
installed to mix and aerate industrial effluent
Transvac Mixer / Aerators are a mass momentum exchange device which uses the energy of pressurised liquid to entrain, mix and pump air into a secondary liquid.
The action of the Venturi Mixer / Aerator is ideal for mixing balance tank effluent on industrial plants. The unit not only provides effective liquid / liquid mixing, but it also entrain atmospheric air to further enhance mixing and transfer oxygen into effluent.
The system works successfully with varying liquor depths and for keeping solids in suspension. A connection into the tank from the air stack also enables the unit to operate as a liquid / liquid mixer with no air entrainment.
With no parts within the tank requiring maintenance and with corrosion resistant materials of construction available the Transvac Mixer / Aerator is an ideal mixing device for plants handling aggressive hazardous effluent.
The oxygen transfer feature of the Transvac Mixer / Aerator is used to it's full on food waste balance tank mixing because it can keep the effluent 'fresh', avoiding unpleasant odours.
Mixer / Aerator installed at a food plant
for mixing and aerating effluent in a balance tank
Advantages
No moving parts
No splashing or aerosol created
Operates at variable depths
No bridges or bearings used
No in-tank maintenance needed
Controllable mixing
Simple, reliable and robust
Virtually silent operation
No aerosol spray
Materials to suit the process
Principle of operation
In operation, recirculated liquid is pumped from the process tank into the aerator where it is accelerated through the patented vortexing nozzle. This results in an area of low pressure and high velocity into which air is drawn. The two streams intimately mix before discharging as a turbulent plume creating horizontal and vertical mixing patterns across the process tank.
Materials of construction
Standard Venturi Aerator materials include stainless steel, carbon steel, PVCu and polypropylene. Pumps and ancillary equipment materials are selected to suit the process conditions.
Mixer / Aerator installed at a food plant for mixing and aerating effluent in a balance tank
Transvac manufacture a complete range of Jet Syphons which use steam as the motive force to pump liquids. These units are ideal for pumping waste liquors in-line and from sump or bunded areas. Extensively used for high integrity nuclear waste pumping and for aggressive effluents on petrochemical and general process applications. Special designs and materials of construction are available.
