A bio digester septic system that biologically digests organic material, either anaerobic (without oxygen) or aerobically (with oxygen). Microbes and other bacteria break down organic materials in a biodigester

A biodigester is a system that biologically digests organic material, either anaerobic (without oxygen) or aerobically (with oxygen). Microbes and other bacteria break down organic materials in a biodigester. Most food, including fat, greases, and even animal manure, can be processed in a biodigester.

Biodigesters are a closed system; therefore, it gives off no odor from food waste; this will eliminate flies and rodents from the facility, increasing hygiene. Also, eliminating food waste on-site saves money by reducing hauling costs. The capacity of food a biodigester can process depends on the size; larger the digester more food it can handle. Biodigesters are a living system and require minimal maintenance.  Biodigester treatment plant provides the modern environmentally friendly alternative to septic tanks



Biozone BZN

The Biozone biodigester Septic system is perfect for managing your toilet and kitchen waste. It breaks down the waste into digestate, gas, and odorless water that can be safely discharged to the environment via the modern biozone soakage trench. This eliminates the need for constant emptying and disposal of waste as is common with septic tanks.

The Biozone Biodigester has proven effective for managing waste in both domestic and commercial environments.

How is Biozone Biodigester Septic System different from other common biodigesters in the market?

Most of the common biodigester septic tanks in Kenya are small, single chamber systems with a baffle walls and have small volume capacities. This prevents the waste from being fully broken down due to minimal waste retention time. The Biozone Biodigester Septic System has four distinct chambers and sufficient volume ensuring adequate retention time for waste digestion

Secondly, most of the common biodigester septics have small inspection points (100-200 millimeters in diameter) and are therefore too small for effective inspection and maintenance. The Biozone Biodigester Septic System has three large distinct inspection points (450 by 600 millimeters) this enables effective inspection and maintenance.


The BlueFlame Biodigester system has the following unique features that make it very effective in wastewater management.

  1. Size – The Biozone Biodigester’s size is not fixed. It is determined by the amount of waste produced at the premises in which it will be installed. The right size makes sure that the right waste retention time is achieved and this makes sure that the waste undergoes full treatment.
  2. It has four chambers – The second unique feature of the Biozone Biodigester is that it is a four-chamber system.
  3. The first chamber receives raw waste and traps all inorganic and non-biodegradable waste like plastics, sanitary pads, and baby diapers that can be removed during maintenance sessions. It also acts as a trap for fat and grease.
  4. The second chamber is airtight and is inoculated with bacteria and enzymes. This creates an optimum environment for anaerobic digestion and is the chamber in which most organic solid waste is broken down into water and gas.
  5. The third and fourth chambers provide an environment for maximum settlement of any suspended solids prior to discharge. They also enable denitrification, further reducing the ammonia in the final effluent, making it odorless. Clean water exits the fourth chamber via the outlet to the leaching lands.
  6. Large inspection points – The third unique feature of the Biozone Biodigester septic system is its larger inspection points. Its inspection points are 450 millimeters by 600 millimeters in area. This makes it possible to reach every point in the system and thereby makes full servicing of the system easy.
  7. Presence of well-fitted downpipes – The fourth unique feature of the Biozone biodigester is the presence of well-fitted downpipes in the system. These downpipes regulate the flow of water from one chamber to the next without passing floating or settled waste. They also minimize water turbulence in the system, thereby increasing the rate of suspension and settling of waste in the right chambers.
  8. Presence of membrane bioreactors – The fifth unique feature of the Biozone biodigester is the presence of the membrane bioreactors in the system. They are fitted between the third and fourth chambers and at the outlet in the fourth chamber. They enhance water filtration and make sure that the final effluent is over 90% solids-free.

Biozone BZN FIX

Biozone Septical Biodigester Septic System is an upgrade to the Biozone Biodigester System where Fixed Film reactors are incorporated.

Fixed-film reactors (FFR) are biological treatment processes that employ a medium of natural or synthetic solid material that will support biomass on its surface and within its porous structure.

Two types of fixed-film reactors may be considered;

  • those in which the medium is held in place and is stationary relative to fluid flow
  • those in which the medium is in motion relative to the wastewater

From the anaerobic digestion chamber the effluent enters the reaction chambers where countless bacteria lodged onto the fixed film reactor breakdown the waste. This fixed-film reactor is so designed to ensure that the system works even in the most difficult conditions of overloading, flooding and toxic shock. It also ensures low sludge wastage reducing sludge removal to minimum thereby saving costs.


  • The fixed Film Reactor combines aerobic, anaerobic and anoxic zones and increases the Sludge Retention Time, promoting better nitrification compared to simple suspended growth systems
  • System nitrification is also restored faster since a large mass of nitrifiers is retained on the fixed-film
  • Improved process stability
  • In various studies it has been noted that the Sludge Volume Index (SVI) improves and has less variation when FFS upgrades are implemented
  • Reduced Sludge Production


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