Burford Effluent Systems

Concrete septic tanks and waste water treatment systems

Burford have been building septic tank and effluent disposal systems since 1958

Effluent system design is a technical job, requiring specialist knowledge. With more than 50 years experience, Burford's effluent treatment solutions are found throughout Southland, Otago and the Southern Lakes District. 

Effluent treatment systems are part of Burford's core business. As research improves, Burford incorporate the recommendations into system improvements to ensure you get the best system for your property, that will preserve the health of your family, stock and land.

Septic Tank Systems

Concrete septic tank systems

Burford are the leading provider of robust concrete septic tank systems

Septic tanks are the number one way for rural homeowners to treat their wastewater, whether it is domestic or dairy activities such as farm flood washing. Burford have been installing septic tank systems throughout Southland, Otago and Canterbury for over 40 years.

Septic tanks work by separating solids from liquids. They should be used as the first step in comprehensive wastewater treatment for most New Zealand farms. Wastewater is fed in to the tanks via gravity (normally using inlet pipes), which is why septic tanks are typically placed underground. Where this is not possible, Burford have come up with a number of solutions to pump the effluent into the concrete tank.

Septic tank effluent treatment 

Wastewater is full of pollutants that can be damaging to your environment if released without treatment. Your regional council is required to ensure disposal of wastewater is done sustainably under The Resource Management Act (RMA) 1991. The responsibility for treating wastewater is yours. 

  • Within the tank, decomposing solid particles settle and form a tank floor "sludge", whilst lighter items like fat and detergents form "scum" which floats in the water.
  • When the septic tank outlet is emptied, the treated effluent (in the "settling" area between the sludge and scum) flows out to a designated disposal area on the farm. 
  • The tank outlet is positioned under the normal level of the floating scum later so that only a small number of these solids are released.
  • Over time, this effluent is filtered via soil layers, where bacteria break it down and render it harmless or neutral. 

Concrete septic tank options

Single chamber concrete septic tank systems

Burford provide a full range of septic tank solutions, which can be tailored to your exact needs. Our single chamber septic tanks come in a variety of sizes to suit any New Zealand farm application. 

Capacity (litres) Height Diameter Length Tank base to inlet Size of hole (mm) Weight (tonnes)
2700  1500mm 1825mm   1320mm 2100 square 2
3600  1500mm 1500mm 2700mm 1340mm 1700 W x 3100 L 2.5
4500  1950mm 1500mm 2700mm 1740mm 1700 W x 3100 L 3

Dual chamber concrete septic tank systems

Dual chamber septic tanks have two chambers. The first chamber is a typical septic tank with an outlet and filter which holds 4500 litres. The second chamber holds 1100 litres and an effluent pump or dosing siphion can be installed here. The overall capacity is 5600 litres. 

Burford can work with your farm contractors to deliver and install the dual chamber septic tank (or any of our other septic tank solutions) for you. 

Our septic tank solutions can be configured to support automatic dose-delivery of septic tank effluent to soil absorption systems. Your septic tank system should be pumped out every 3 - 5 years to remove the decomposed solids from the tank bottom. 

Capacity (litres) Height Width Length Tank base to inlet Size of hole (mm) Weight (tonnes)
5600 1600mm 1900mm 3600mm 1320mm 2400 W x 4200 L 4

Other septic tank solutions 

Burford also provide other septic tank and effluent treatment solutions that can be manufactured from our water tank sizes ranging from 1100 litres up to 30,000 litres to suit your requirements. 

  • Pump chambers
  • Treatment plants
  • Two-in-one septic tank systems

Septic tank producer statements

Producer statements are available on request for all Burford concrete septic tanks and septic tank systems. 

Get in touch with Leigh to discuss the best septic tank system for your requirements. 

Waste Water Treatment

Selecting a waste water system for your property

Concrete septic tanks to sewage treatment plants

When building a new home in the country the effluent from the property must be treated and disposed of without affecting any neighbouring properties. Burford can provide anything from a single concrete septic tank to a sewage treatment plant depending on your requirements.

During the planning stages, an engineer must perform a site and soil examination. This will determine whether a septic tank or wastewater treatment plant will need to be installed on the site to treat the effluent to a required standard. In some cases the effluent, when treated correctly, could be used for irrigation around shrubs and on grass.

Burford waste water systems can be scaled up or down, depending on the property or subdivision size. Burford's waste water treatment plants have been installed throughout New Zealand and are well proven in the market place. We have installed treatment plants in some extremely remote locations in the South Island including Deep Cove in Fiordland.

For more information on selecting a waste water system for your property, read our information booklet for homeowners or contact Leigh to talk through your requirements. 

Stone Traps

Concrete stone traps

Trap stones and debris before they enter your effluent tank

The Burford stone trap, sometimes known as a wedge by some in the industry, has been maufactured in Southland for over 12 years. There are a large number of stone traps at dairy sheds throughout Otago and Southland. 

Purpose of a stone trap

The stone trap is situated between the cowshed yard and the effluent tank. Stone traps are designed to slow down and direct the flow of effluent so sand, stones and debris can drop out. This will prevent blockages in the effluent pipe work, pumps, storage facilities and applicators. 

Stone traps are generally made of concrete and have a wide base which slopes down toward the pumping or draining end. The inlet is normally well above and on the opposite side of the stone trap to the outlet.

The solids that accumulate in the stone trap need to be regularly removed onto a sealed surface located directly beside the stone trap which drains any liquid back to the stone trap. The solids should be applied evenly to the land.

Burford stone traps are designed so that you can drive a 4WD front end loader into it to clean it out. The effluent from the stone trap then flows to a Burford open-top effluent tank where there is a pump mounted on a pontoon that will pump the effluent to an approved farm irrigator, or disposal system. These tanks will float in 400 - 500mm of water. 

Specifications of Burford's concrete stone trap

  • Internal width at the back wall is 2250mm
  • Internal width at front where tractor drives in is 2450mm
  • Internal height is 800mm
  • Area for placing stone trap is 2.9m x 3.6m x 900mm deep
  • There are 4 x 1.3 tonne ramset type lifters in the floor of the stone trap
  • The holes on each side are 150mm PVC sockets, that will take 150mm farm tuff pvc pipe
  • Weight is 4 tonne

Open-top Effluent Tank

Concrete open-top tanks for effluent storage

Burford provide open-top effluent tanks from 1100 litres up to 30,000 litres

Open-top concrete effluent tanks range in size from our largest at 30,000 litres down to our smallest of 1100 litres. Site preparation and tank delivery is the same as for tanks above ground and Burford's can take care of this for you and work with your farm contractor if required.

To prevent the tank floating, Burford recommends that 12 metres of 10mm diameter steel be threaded through the lifting loops at the bottom of the tank, and two large truck loads of ready-mix concrete be placed around the base of the tank.

Open-top effluent tank risers

Open-top tanks which are situated below ground, allow soil and debris to fall into the tank blocking the pumps. Sites which are also not fenced, are easy for stock, dogs and people to fall into and injure themselves.

To eliminate these hazards, Burford recommend installing a concrete riser the same diameter or larger on top of the tank. A concrete foundation can then be placed around the bottom of the riser, sealing the tank and to stop back fill from running into it. Around the tank can then be back filled to complete the job and make the farm safe.

The sizes that can be manufactured are 3.5m diameter or 3.9m diameter. This is the diameter of the 22,500 litre, 24,750 litre, and 30,000 litre effluent tanks. The maximum height that we can manufacture to is 2.7m high.

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