Sewage Treatment

Nanotech’s sewage treatment technologies for wastewater use attached growth to remove organic matter and suspended solids.

Why do we treat Sewage/Wastewater?

Firstly, we treat sewage for hygienic reasons and to protect the population against diseases and illness. Secondly, to protect the environment such as raw water sources (rivers, boreholes, streams, and dams) against contamination.

Thirdly, to recycle wastewater for re-use as it is a scarce commodity and for aesthetic reasons which eliminates bad smells. Furthermore, Companies are legally required to treat wastewater and must comply with discharge standards and above all else, it’s the right thing to do!

How do we treat Sewage or Wastewater?

 Our packaged sewage treatment systems are based on a preferred technology known as Submerged Aerated Fixed Film (SAFF) technology. The typical process consists of the following steps:

  1. Screening -> Primary treatment (septic tanks)
  2. Carbon removal and nitrification (recycle tank and SAFF) 
  3. Solids removal (secondary settler) 
  4. Chlorine contact tank for disinfection (chlorination). 

The outlet water quality expected from the SAFF process is in compliance with the RSA General Specification “Revision of general authorisation in terms of section 39 of the National Water Act 1998 (Act no 36 of 1998)” or if required, the South African Special standard.

Biological oxygen demand (BOD) and chemical oxygen demand (COD) are organic contaminant parameters used to measure water quality. As a result, BOD is used to determine how fast biological organisms consume oxygen in a body of water, while, on the other hand COD measures the amount of organic compounds in water.

SAFF is an extremely efficient and well-proven sewage treatment process which enables the reduction of the main contaminants which are:  BOD, COD, Ammonia, Nitrogen, Suspended Solids and Ortho-Phosphates.

For Instance, A typical operational cycle would commence with wastewater being collected in the septic tank, which also acts as the balance tank at the front end of the plant. This balance tank offers flow buffering during peak inflow periods. The collected sewage is pumped to the SAFF unit where aeration takes place. The final treatment includes settling and chlorination, with internal recycle streams for de-nitrification.

Therefore, Nanotech designed the SAFF wastewater treatment plant with superior compliance to required legislation, consistently and reliably,  when compared to other technologies.

In conclusion, The Nanotech-branded technology, known as “Compliance”, has been designed to maximize technology efficiency and low operating costs.  The sewage systems are manufactured in-house and pre-tested, before being shipped to site ready for rapid installation.


Advantages of the Nanotech Sewage Treatment Technology:

  • Simple, reliable biological process.
  • It Leaves a smaller carbon footprint than the traditional systems.
  • Effective in treating high concentrations of organics.
  • The final water quality conforms to The South African General Limit.
  • The final outlet water can be treated to achieve The South African Special Limit.

Other benefits of the Nanotech Water Solutions SAFF systems:

  • Less time spent on site.
  • Fewer civil structures and less inter-connecting pipework and process equipment, with the resultant savings in capital and operating costs.