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The Sannitree Package Plant system is economically viable to treat up to 20 cubes of waste water per day. The treated water is suitable for irrigation as determined in the Revision of S.A.General Authorisation of Section 39 of the National Water Act 1998, revised 27 February 2004 Section 2.7 (ii). We advise before embarking on the purchase of any package plant that you register with your local D.W.A.F. office for the standard required for your application and insist on this in writing.
Sannitree provides a complete Do-It-Yourself kit for the construction of a bioreactor for sewage treatment. Installation by Sannitree in the Western Cape can be negotiated.
The methodology of the system uses a septic tank as a primary digestion unit.
The existing tank, if available, should be pumped out and cleaned before connecting to the bio reactor. Prebuilt tanks made from concrete, fiberglass or plastic will work, providing the capacity meets the required volume.
To view Schematic Flow Chart click here
The effluent from the septic tank is either gravity fed or pumped to a bio reactor.
The bio reactor can be built out of brick and mortar or supplied in fibre glass modular form, capable of treating five cubes per day.
Brick and mortar detailed plans are available from Sannitree. We also have detailed plans where the septic tank and bio reactor are built as one unit.
From the septic tank effluent flows to the aeration chamber, in this tank compartment a Force 7 aerator is secured to the wall. The Force 7 blows huge volumes of AIR into the water at an adjustable depth, in the form of micronised bubbles. It mixes with the turbulence optimising the dissolution of air and oxygen in the water, neutralizing polluting elements. The Force 7 ensures superior performance in transferring oxygen into the water. It delivers up to 2.4 kilograms of oxygen per hour.
Maintenance of the Force 7 is simple and is done on a yearly basis. All parts are available from Sannitree. The unit is available in single or three phase motors.
Bio balls are packed quite compactly to increase the retention time in the bio reactor.
They also increase the biofilm attachment surface area. Their surface area is 20 cm3. They are made from ABS material which combines strength and rigidity from the acryl nitrite + styrene polymers with the toughness of polybutadine rubber.
Immediately after the aeration chamber is a settling chamber housing a submersible pump. This pump transfers the sludge from the bottom of the chamber to the inlet of the septic tank. Both the Force 7 and the sludge return pump are operated on a predetermined time switch on the control board. The settings depend on the flow rate. The standards for faecal coliform counts differ from application to application. If the standard requires a zero count, we recommend the use of a chlorinator.
The effluent from the settling tank is pumped via a submersible pump through a flow meter with a pulse emitter, which activates the desired units of chlorine into the liquid, and then on to a contact tank. The size of the tank will depend on the flow rate.
The alternative is the use of an ozonator. In this case the liquid passes from the settling chamber to the contact tank by gravity.
A submersible pump in the contact tank is connected to an ozonator by means of a diffuser which doses the liquid with the required amount of ozone. The size of the tank will depend on the flow rate. Both of the above options would be connected to the control board.
The contact tank is fitted with an irrigation pump, activated by a float switch which then disperses the treated effluent on demand. An alternative to immediate irrigation is an evaporation dam. If this option is used we recommend the installation of a SPLASH unit to reduce algae growth and to maintain the liquid in an aerobic condition.
Precise instructions on assembling this system are supplied and advice to determine size and capacity is available from Sannitree.
The plant comes with a service manual which must be strictly adhered to if standards are to be maintained. In order to maintain the correct balance the plant needs supplementary dosing of enzymes and bacteria monthly.
Bio Enzyme Granules for Septic Tanks and Oxy-Gen-Ator for Bio Reactor
(see Bio Enzyme