There are multiple requirements for storage systems for chemical dosing:

• Hazardous chemical storage requirements
• Environmental safeguards
• Occupational health and safety requirements
• Compliance with AS4452-1997 for storage and handling of toxic substances

  

CDU2.5 from Bioaction 2500 Litre Capacity

Chemical dosing of iron salts Ferric Chloride (FeCl3) and Ferrous Chloride (FeCl2) or MHL, Magnesium Hydroxide Liquid Mg(OH)2 in sewer networks is a well-recognised mitigation method for the treatment of odour and corrosion problems caused by gases such as Hydrogen Sulphide (H2S) and Volatile Organic Compounds (VOCs). The chemicals used in dosing are highly toxic and require specialised storage -facilities and delivery systems for the sewer. Other chemicals used in industries like mining and manufacturing also require secure chemical dosing facilities to house dangerous chemicals.

  

               Perspex chemical barrier to protect operator        |        safety shower and eye bath      |      Manifold dry-mate, dry disconnect hose connection

  

        Automatic extraction fan to exhaust any chemical fumes           |                         Raised flooring over spill capture sump   

Bioaction’s Chemical Dosing Unit (CDU) systems have been developed in consultation with major Australian water utilities and others to deliver a state of the art facility for the safe and secure bulk storage and handling of hazardous chemicals for the municipal water and waste-water markets as well as other industries. The Bioaction range of chemical dosing units has been designed to comply with all the Australian standards defined in AS4452-1997.

Environmental safety is paramount when storing toxic chemicals. The Bioaction CDU building is completely lined with chemical resistant PE/HDPE and the chemical bund is made from the same, preventing the escape of any chemicals in the event of an internal spill. Additionally all critical internal components are constructed from chemical resistant plastics. The CDU’s connections to water, power and supply lines to infrastructure are housed in an internally accessed subterranean services port to prevent access externally.

  

 Subterranean services port that houses water, electricity, chemical lines and drainage which is accessed internally to stop access from outside the CDU

The valve located in the delivery bay bund is automated by the CDU’s controls to close when the CDU is accessed and on a timer delay open again when the operator has exited the building thus preventing any chemical escape should a tanker failure occur.

The CDU is secured by reinforced concrete walls and powder coated 316 stainless steel security doors.

The chemical tank has been designed as a low rise tank make the most efficient use of the internal space and reduce the risk of spurting chemical in the event of tank rupture.

All SCADA transmission requirements are catered for including:

• Level indicator in the tank for continuous monitoring via a 4-20mA signal.
• Dosing pump fault diagnostics
• Door open security signal
• High and low level switches in the tank
• Actuated valves in the tank bund and the operator control bund are controlled via PLC

  

                  SCADA enabled fill level gauge                 |                   SCADA enabled dosing pump                 |                    SCADA enabled control panel

The Bioaction CDU range has been optimised for road and rail transport to site by using efficient sizing and by constructing the units from lightweight reinforced concrete. This enables rapid transport to site and with only small cranes required due to the lightweight easy off loading and placement onsite is achieved.

  

                     Dimensions designed to comply with standard truck and rail freight requirements for non-wide load status

O.H.& S Compliance

Complete operator safety system package included:

• Safe delivery process automation, which stops the operator unloading unless all systems are OK.
• Safety shower and eye wash with water pressure sensor.
• Wash-down hose-real with water pressure sensor.
• Mechanical fill level indicator.
• Emergency fill-pump cut off and emergency stop button.
• Fill nozzle isolated behind a Perspex cover.
• All dosing pump and pipe systems are isolated behind the Perspex barrier in a separate cabinet.
• Chemical proof tank and bund.
• The operator is isolated from the chemical area during filling.
• Internal drainage sump to isolate chemicals from the operator.
• Electrical control cabinet separated from the chemical storage area to minimise risk of fire.
• Lights and extraction fan turn on automatically upon entry.
 

DosaCHEM^TM Chemical Dosing Unit Range

		Tank Capacity	Chemicals able to be stored		Vessel	Outside Dimensions   (Foot Print)			Weight
Series	Model	Litres (000)	Ferrous Chloride	MHL	Material	Width C (m)	Length D (m)	Height A (m)	Tonne
DosaCHEMTM	CDU2.5	2.5	Yes	Yes	PP	2.4	2.4	2.8	7.5
	CDU5.0	5.0	Yes	Yes	PP	2.4	3.5	2.8	10.2
	CDU8.0	8.0	Yes	Yes	PP	2.4	5.0	2.8	14.1
	CDU10.0	10.0	Yes	Yes	PP	2.4	6.0	2.8	17

 

 

 

 

 

 

 

 

 

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