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Chemical Dosing Systems
Dioxide Pacific are experts in the design, manufacture, installation and commissioning of chemical dosing systems. A few typical examples are outlined below
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Application: Chemical Metering of Fluorosilicic Acid (FSA) for Potable Water including Bulk Chemical Storage & Dosing Pumps
Dioxide Pacific was engaged by GWM Water in Victoria to design, supply and install a chemical dosing and storage facility for fluorosilicic acid. This facility is designed to dose 0.8 - 1.0 ppm into a maximum flow of 320 L/s.
The system consists of a 6,500L fibreglass bulk storage tank, 440L day tank, concrete bund area for the chemical storage tanks and concrete tanker unloading driveway for up top 25MT tanker deliveries. Chemical is transferred from the bulk storage tank to the day tank using a mag drive pump. Fluorosilcic acid level within the storage tanks is monitored with ultrasonic level transmitters and the day tank is located on a weigh frame with load cells. Chemical dosing is with duty and standby ProMinent Delta dosing pumps. Dosing pumps, dosing pipework and valves are installed in an HDPE dosing cabinet. Concrete surfaces in the bund and unloading area are coated with a chemical resistant paint.
The complete system is controlled from a central control panel which includes a GE Fanuc PLC. There are many safety features built into this plant to prevent under and overdosing of FSA. The system has been built virtually metal free as FSA fumes corrode all metals (except Hastelloy C) so all fixings, pipe clamps and strut are Aickinstrut Vinylester which are fully chemical resistant.
For more information on Fluoride Dosing Systems for potable water, visit our Fluoridation page.
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Application: PACL and Polymer Dosing of Ash Dam Water
Dioxide Pacific was engaged by a power station to design, supply and install a chemical dosing system for PACL and polymer. Ash water is pumped from a nearby dam and dosed with PACL (poly aluminium chloride) to aid coagulation before this water is introduced into a clarifier.
The system consists of a 2 x stainless steel 1,000L IBC bund tanks, ProMinent Sigma S3Ca chemical dosing (metering) pump, by-pass pipework and pump, ash water pipework and electrical control panel. Ash water is pumped from the dam into 200mm schedule 80 grey UPVC pipework. This pipework is located on concrete bases near the chemical dosing plant. Water is drawn from the ash water pipeline, dosed with PACL and then mixed back in just prior to a static mixer. Liquid polyelectrolyte is diluted in-line prior to introduction into the PACL dosed water. The treated ash water is introduced at the clarifier inlet.
The complete chemical dosing system is controlled from a local control panel with Allen Bradley PLC and monitored from the plant SCADA. Dioxide Pacific was responsible for concept and detailed design along with installation, commissioning and proving of plant performance.
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Application: pH Correction System for Sugar Mill
Dioxide Pacific was engaged by a water authority to design, manufacture and install a chemical dosing system for pH correction of runoff water from chemical storage areas. The system consists of chemical dosing pumps for sulphuric acid and caustic soda, 12000L fibreglass underground treatment tank, recirculation and discharge pump, chemical dosing and transfer pipework and IBC Bunds for chemical storage.
Control of the chemical dosing pumps is from a ProMinent D1CAW0P bi-directional pH controller which provides pulse output to both dosing pumps. Once the pH is correct and the level in the tank is at high, treated water is discharged to sewer.
The complete chemical metering system is controlled from a local control panel with Allen Bradley PLC and monitored from the plant SCADA. Dioxide Pacific was responsible for concept and detailed design along with installation and commissioning.
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Application: Design and Construction of Chemical Dosing System for Aluminium Sulphate
Dioxide Pacific was engaged bv Coliban Water in Victoria to design and construct a chemical dosing and storage upgrade for alum at the Echuca Water Treatment Plant.
The installation included removal of existing storage facilities which did not comply with EPA bunding guidelines and replacement with new 38,000L bulk storage tank, concrete bund and tanker unloading facility. New chemical dosing pumps ProMinent Sigma S3Ca were installed with flow paced 4-20mA control from site SCADA. Dosing pumps were installed inside a 316 s/s cabinet to protect them from the weather and vandalism. The bund area was fully enclosed with a safety fence.
Dioxide Pacific was responsible for full mechanical, electrical and civil works for the project and final performance testing.
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For more information on chemical dosing systems or to obtain a quotation, please complete the feedback form on our Contact page.
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