EnviroServ Water Treatment Plants





Treatment plants are available in a range of sizes from 1.1 to 10kL per day. For the treatment of domestic waste water we propose a low energy biological treatment process. The treatment plant comprises existing solids interceptor, flow balancing and one multi-media biological (SOG) filter. Treated effluent can be re-used in a sustainable manner. The treatment process we favour is briefly described below.



  • Waste water is collected at a solids separation tank. Overflow from this tank is directed to a suitably located flow balancing tank and pump sump arrangement. Solids free effluent is pumped to the SOG trickling filter, comprising 6 – 27 modules depending on plant design flow rate stacked SOG crates.
  • Organic treatment of the solids free waste water takes place in a mixed media biological filter. Waste water is sprayed above the media.
  • The waste water percolates through the media. The total passage time is approximately 48 hours.
  • A trickling filter ensures that solids are pumped back to the septic tank, allowing the drainage of clear disinfected liquid, suitable for irrigation use.
  • The mixed media hosts a range of organisms including bacteria, fungi and worms.
  • The treated water is collected in a sump for re-use. A pressure pump is supplied to discharge the treated water for irrigation purposes.





  • Proven technology
    The high rate activated sludge process is a tried and tested process that has repeatedly demonstrated capacity and ability in the treatment of biodegradable industrial and domestic waste waters. The treatment plant will have standby aeration equipment to ensure uninterrupted duty. The bioreactor is designed to accommodate large variations in hydraulic load. Treated effluent is compliant with the General Limit as prescribed in the National Water Act. An effluent compliant with the General Limit can be safely and legally discharged to most river catchment areas in South Africa.

  • Low energy
    The bioreactors are based in the principle of trickle filtration which is operated by means of gravity feeding.

  • Low visual impact
    The bioreactor and solids separation tank for treatment plants are constructed below ground level. Plants selected for the reed bed will be evergreens, thus able to function throughout the year.

  • Low maintenance
    The treatment plant design centres on ease of use and simplicity.

  • Upgrade considerations
    A key feature of the design is the provision for upgrade in the event of future growth. The bioreactor geometry is chosen to allow simple addition of more crates.

  • Minimal solids handling
    Solids are captured in the solids interceptor. Dissolved solids are broken down in bioreactor crates.

  • Agricultural use of waste water
    The Sludge Guidelines published by the former Department of Water and Forestry are used to classify sludges according to certain parameters. Once a classification is determined, the Guidelines indicate the various disposal options for each class of sludge. Volume 2 of the guidelines indicates the requirements for the agricultural use of waste water sludge.


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