Parallel timber Weeping Wall separates solids from liquid, retaining the bulk of the organic nitrogen and phosphorous within the solids
Greenwash system significantly reduces fresh water consumption for shed wash, (down from industry standard 70 litres/cow/day to 20 litres/cow/day)
Totally automated system significantly reduces labour inputs required to manage effluent
Use of enclosed storage tanks for liquid effluent eliminates rainwater entering storage ponds therefore reducing amount to be dispersed to land
Distribution system allows controlled application to predetermined areas at super low application rate of 0.25mm, thereby eliminating run off, contamination of waterways and allowing grass to fully uptake all nutrients preventing leaching.
Secondary filters further clarify liquid effluent to be dispersed
How the system works.
Shed Effluent and wash water is gravity fed from the shed to the via a pipe line and deposits effluent into one side of the twin chamber weeping wall. Having two chambers enables the use of one side, when this is filled the pipe if moved to the other side, allowing the solids to dry out fully prior to being removed and used as a fertilizer.
The weeping wall has a 4mm gap between timber vertical pickets which is self cleaning as the solids dry. They shrink and draw down, cleaning as they move.
The solids are retained to the side of the centre cavity with the liquid entering the pump chamber located in a sump between the walls.
This liquid is them pumped to the first holding tank, with the liquid being used as a “greenwash” to automatically wash the external cow yards via a series of nozzles attached to the backing gate.
Once this greenwater has washed the yard clean, it is recycled back through the inlet pipe to the Weeping Wall, pumped through the central chamber of the wall, and refills the greenwash tank.
Once the greenwash tank is full, the liquid continues pumping from the greenwash tank to the effluent storage tanks through a secondary bio filter. This refiltered liquid is store in the storage tanks until it is dispersed to land via the Clean Green distribution system.
The liquid FDE stored in the storage tanks is dispersed to land through a series of control boxes to arrays of unique K-line irrigation pods. These pods are designed and installed in a series of lines to apply liquid effluent to a predetermined set of paddocks in a controlled manner.
The Clean Green distribution control boxes have been designed to automatically switch between arrays of pods at 7 minute intervals to ensure that the an application depth of 0.25mm is achieved.
These pods are designed and installed in a series of lines to apply liquid effluent to a predetermined set of paddocks in a controlled manner.
The number of pods and paddock dispersal area is determined by the herd size of the farm.
For example a farm with a herd size of 650 of effluent cows would have a total of 192 pods.
This system would utilise two paddocks of pods operating in groups of 36 pods.
Each group of 36 will run for seven minutes, then stop. Seven minutes later the next set of 36 will operate for seven minutes until all 192 pods have dispersed 120 litres of FDE at an application depth of 0.25mm.
192 pods will disperse 23,000 litres/day at an application depth of 0.25mm or ¼ of a mm.
A shed with 650 cows at 20litres/cow/day produces 13,000 litres day, so the system can disperse far more than the amount produced per day.
This cycling between the pods enables discharge at the extra low application rate and depth which in turn allows for discharge of effluent to land over longer periods of the season compared to traditional irrigation systems and the modern low rate discharge methods.
By dispersing at a rate of 0.25mm per day, (less than the rate of evotranspiration at 0.6mm per day) the system ensure that all the nutrients from the effluent discharge is taken up by the plant. This prevent loss of nutrients by leeching, preventing nitrates entering groundwater.
Reduction is Fresh water usage.
Industry standards are 50-70 litres per cow per day for shed and yard wash. Farms operating Clean Green Systems report an average shed wash use of 15-20 litres per cow per day. This is achieved via the use of the greenwash system to wash the yard. This reduced water usage is confirmed by reports from regional councils, and water bore log reports.
Reduction in Effluent to be discharged.
Traditional “megapond” storage facilities, require a large footprint whereby rainwater can cause a substantial amount of liquid added to the pond. Once rainwater enters an effluent storage pond, this liquid is then tainted and becomes effluent to be dispersed to land. By using sealed tanks as effluent storage, and minimizing the footprint of the Weeping Wall, the Clean Green System attracts far less rainwater, thereby substantially reducing the amount of “effluent” to be dispersed to land.
Reduction in leaching
By applying effluent to land via a controlled system at a very low application rate, the system ensures that all the nitrates, phosphorous etc is effluent is able to be taken up by the plant rather than leeched to groundwater. By applying at a rate less than evo-transipration, it means that the system can safely irrigate to pasture even in periods when soil moisture is high.
Controlled Nitrate loading
Accepted industry standards highlight a maximum application of 150kg/Nitrogen per hectare per year to areas effluent is applied to. This can be a difficult figure to monitor and control. The Clean Green System is designed and installed to a strict adherence to nitrogen loading levels within the dispersal area, in conjunction with a farm Nutrient Management Plan. This ensure the best use of fertiliser within the dispersal area, and also prevents over-application and runoff.
As Clean Green continually monitor and test pipe end irrigation levels, we are able to accurately manage nitrogen loaings with Farmers.
Reduction in runoff.
The system irrigates to controlled paddocks, a suitable distance from exposed waterways and property boundaries. This ensures there is no risk of contamination to waterways, or run off to other areas of farms as can occur with the use of travelling irrigators/pivot sprayers.
The Clean Green weeping wall is encased in a fully engineered concrete sludge bed. This ensures that there is no leakage from the pond to groundwater, or any other leakage/overflow to surrounding areas. Similarly the storage tanks are sealed plastic, and cannot leak/ runoff effluent.
Reduction in odour / offensive discharge
As the Clean Green System quickly processes effluent from the shed to the paddock it remains anaerobic meaning there is virtually no offensive odour produced either from the storage facility or the dispersal system.