The objective of any effluent treatment program is to reduce potential treatment &disposal cost savings by turning a waste into a resource that can provide economic or social benefits. Compliance for disposal also is a driver to ensuring that that the tail end of the complete water cycle is managed correctly.
In establishing EDGE, pride is taken to ensure only industry qualified and skilled technical specialists are engaged to provide innovative solutions to difficult trade waste issues affecting compliance and your TW charges.
TW Plant assessments for compliance and plant optimising
Chemical dosing pump, instrumentation/controller servicing and calibration
Assess to full range of chemical dosing pumps and controllers. Also includes TW monitoring and controls including pH, Temperature, turbidity, conductivity, dissolved oxygen and level controls.
Dial-up connections for remote monitoring of trade wastewater plants
Chemical and/or Engineering Solutions
Water Recycling and Re-Use
1. Chemical Treatment (Flocculation/Sludge Removal)
This process involves –
Some pH adjustment if necessary
Adding polymers (inorganic or organic) to the incoming raw effluent in a region of adequate mixing to promote the formation of small pin flocs.
Potentially generating between 4-6 times additional sludge volume
This increased sludge volume can impact on costs to remove this sludge off site.
There are now effective technologies now employed by to dewater this produced sludge, these include –
Natural cone tanks &
Geotubes – these are typically supported on a steel frame where water seeps out under pressure from a pump, low capital cost & very effective.
2. Biological Treatment
Biological Treatment involves removing colloidal organics by
Anaerobic process or
Typical traditional options for biological treatment for BOD removal are:
Ponds / Wetlands / Lagoons
Since around 2000, there has been development of smaller, low cost &more effective methods such as the Fixed Media Bio-Filtration (FMBF) process which can achieve BOD levels < 10 mg/L with no limit to the % of effluent available for recycling. The advantages offered by the FMBF process are:
No free biomass (no sludge removal or biomass polishing)
Lowest odour risk of any biological process
More tolerant to changing conditions
Physical media cannot die &has a high re-growth rate of 1-2 weeks.
Residence time not time limited – more media can be added as required
3. Teritary Treatment
This process would typically follow a biological process which produces high quality water suitable for re-use as make-up to cooling towers or boilers in industrial plants.
Depending on the type of effluent & contaminant levels, recovery rates are typically 60-70%.
Before a process can be employed, secondary treatment (i.e. biological) must reduce BOD levels to below 50 mg/L to prevent gross fouling of the membranes.