What is eWQMS?

Emanti Management's Water Quality Management System (eWQMS) can be used to guide the tracking, reviewing and improving of water quality.

Small communities often have many challenges related to wastewater treatment including:

  • Stringent discharge quality requirements (same limits as for larger communities but with economic constraints)
  • High per capita costs (do not benefit from economies of scale)
  • Limited finances
  • Limited operation and maintenance budgets
  • Limited expertise to manage wastewater treatment systems

On-site wastewater treatment systems often used for individual residences and other community facilities in unsewered areas include:

  • Septic Tanks - Pre-fabricated tanks that serve as a combined settling and skimming tank and acts as an unheated-unmixed anaerobic digester.

  • Grease/Oil Interceptor Tanks - Can be placed before septic tanks to trap grease and oil.

  • Imhoff Tanks - Similar to septic tanks with sedimentation occuring in the upper compartment and digestion of settled solids accomplished in the lower compartment.

  • Disposal Fields - Series of narrow, shallow trenches filled with porous medium (gravel) into which effluent is disposed.

  • Filters - Are sometimes used when disposal fields cannot be used.

The principle considerations required when selecting and designing on-site wastewater treatment systems are:

  • Hydraulic assimilation capacity (soil and hydrogeological characteristics, percolation testing, etc)
  • Disposal field design (wastewater quality and quantity, hydraulic gradient, etc)
  • Treatment requirements (wastewater quality)

Package Wastewater Treatment Plants can successfully treat wastewaters if they are properly sized, operated and maintained. Typical package plants utilise the following components:

  • Rotating Biological Contactors (RBCs)
  • Sequence Batch Reactors (SBRs)
  • Extended aeration
  • Contact stabilisation