Biozone NoKak Sewage Treatment Plants

Biozone NoKak Sewage Treatment Plants



Why throw away water you have paid for!

The great attraction of the Biozone Sewage Treatment System is that the treated sewage water is safe to use for irrigation, reintroducing in to rivers or dams, or even in to the house flush systems. Obviously this can be an environmentally friendly system which can save costs and water.

The Biozone system and process described:

  • The raw sewage is channelled to a submerged tank, ( this could be the old septic tank) where non biodegradable products are separated.
  • The sewage is then pumped in to the first reactor tank which contains bacteria growing on media and where the nitrification takes part.
  • From the first nitrification reactor tank, the sewage is then pumped in to the second reactor tank where denitrification occurs, also with bacteria reaction.
  • Then the effluent is pumped in to the clarification tank which is cone shaped and where any solids that escape the first 2 tanks are collected and pumped back to the first tank.
  • From the clarification tank, the now clean and treated water overflows in to the last tank where sterilisation occurs using ozone or Ultra violet.
  • In the sterilisation tank is a submersible pump which will automatically pump the treated water to irrigation, or dams, rivers etc.The “secret” to the Biozone system and the reason we believe the Biozone plants are better than others on the market, is the amount of oxygen introduced in to the 2 reactor tanks to encourage and maintain healthy bacteria growthSTEP 1 – (Pump station) where all sewage and waste water is collected from the settlement. STEP 2 – (Bioreactor tanks) where nitrification and denitrification takes place.
    STEP 3 – (Clarification tank) where sludge settles at the bottom of the tank and the clear water separated at the top.STEP 4 – (Sterilization tank) where the clear water is treated either by Ozone or Ultraviolet and is now ready for recycling.The Biozone NoKak systems begin at 4000 litres per day and OSI has supplied up to 240 cubes per day plants. Should a client require more than this it is possible to replicate the system at another site for example or merely add on to the current plant.
    The anticipated final effluent quality meets the General Standards as per Government Gazette. Requirements for the purification of Waste Water or Effluent. (Revision of general authorizations in terms of section 39 of the national water act, 1998 (act. No. 36 of 1998).

Wastewater Discharge General Limits

pH – Value at 25°C


Suspended Solids at 105°C *


Nitrate as N *


Chemical Oxygen Demand as O2 (Total) *


Faecal Coliform Bacteria / 100 m!*


Free & Saline Ammonia as N *


Each Biozone sewage treatment plant is designed according to the specific requirement of each application. Factors such as the condition of the sewage ( e.g. the presence of a canteen or laundry), the amount of people, and peak operating periods are taken in to account in the design.
Being as the Biozone sewage treatment plants are modular in design, they can be built and added on to in stages to cater for phases of a housing complex, for example.


The process requires sump collection, anaerobic pre-treatment, aerated bioreactors and post treatment clarifier and contact disinfection tank. The treatment works will be containerised as requested. The final treated effluent will be discharged to the nearby watercourse, clean and free of pathogens. The system consists of a combination of anaerobic, anoxic and aerobic reactors to achieve an effluent low in dissolved organic compounds as well as low total nitrogen content.
Anticipated final effluent quality:COD influent: 650 mg/lt
COD: <75mg/ℓ
Ammonia Nitrogen: <5mg/ℓ
Nitrate Nitrogen: <5mg/ℓ
Total coli forms: 500/100mℓ
Faecal coli forms: 500/100mℓ
pH: <8.5