Case Studies

Coalmine Blackwater - Plumbworx

Client: Curragh

Location: Blackwater, QLD

Project Time Frame: 1 week commissioning

Cost Saving: $40,000 capital savings and $5,000 ongoing savings on chemical usage

Issues:

  • Manual handling to mix chemicals
  • Exposed to liquid chemicals and toxic inhalation hazard (chlorine dioxide gas)
  • Unreliable system for chlorine dioxide monitoring
  • High chemical consumptions

Result:

  • Reduce Manual handling, chemicals are handled by metering pumps
  • Avoid direct contact to chemicals
  • Improve system reliability, able to control chlorine dioxide level within the range
  • Reduce chemical usage by 30-40%
Coalmine Blackwater - Plumbworx

Client: Yarrabee

Location: Blackwater, QLD

Project Time Frame: 1 week commissioning

Achievement: Re-commission the redundant MF unit

Issues:

  • Micro filtration System redundant
  • Membrane damage caused by muddy water from truck wash
  • No technical support from membrane supplier due to commercial conflicts
  • Huge potable water consumptions for truck wash

Result:

  • Re-commission the MF unit
  • Conduct chemical clean on membranes & block the damaged membrane fibre to avoid dirty water passing through
  • Source membrane quote from overseas, cheaper than the quote supplied by original supplier
  • System back online treats recycled water for truck wash
Coalmine Blackwater - Plumbworx

Client: Curragh

Location: Blackwater, QLD

Project Time Frame: Ongoing

Achievement: Operate 30 years old plant achieving compliance

Issues:

  • Air is not evenly distributed in the aeration tank, no diffusers installed to yield the oxygen transfer rate
  • Mix liquor flows to clarifier continuously, no decanting weir installed to allow clean water fed to the clarifier during settling phase
  • There is no activated sludge return line for microorganisms added back to the aeration basin for digesting organic matter
  • There is no balance tank installed onsite to overcome peak flow

Result:

Effluent quality compliant with Australian recycled water guideline with
  • pH: 6 – 8.5
  • SS < 30 mg/L
  • BOD < 20 mg/L
  • E.coli < 1000 cfu/100ml
  • TDS/EC < 1000/1600
Coalmine Blackwater - Plumbworx

Client: Curragh

Location: Blackwater, QLD

Project Time Frame: Ongoing

Achievement: Design Potable Water Plant, Capacity up to 150KL/day

Issues:

  • No manual control set up for the existing MF system
  • LC not reliable
  • No pre-treatment prior to the membrane system
  • Expensive annual service from MF supplier

Work Delivered:

  • Detail design on potable water plant with a capacity up to 150KL/day
  • Equipment selection
  • Procurement, source quote for equipment, labour, construction, electrical works & commissioning