Liquid management refers
to the sub-surface injection of liquid organic waste streams into the
soil rooting zone of pastures and crops.
Bio-Recycle owns and operates a fleet of specialised self-propelled
and tractor drawn tankers, or Sludge Injection Vehicles (SIV), which
inject liquids under high pressure into the soil for agricultural gain.
Many organic liquid
wastes possess valuable nutrients or available lime, whichmay be utilised
to either enrich the soil or to rectify soil acidity. These liquids
all have a high water component, which adds significant irrigation value.
When injection is carried out by these specialised vehicles, there is
little surface disturbance or odour, and such programmes may be conducted
in semi-residential areas.
sludge injection programme manages a vast array of biosolids, manures,
treated greasetrap and food industry by-products, that otherwise may
have been deposited in expensive, lined landfills. Carefully monitored
quality control is essential to maintain optimum input of nutrients
for each soil type and crop. Pasture and crop growth following a soil
injection programme has produced some staggering plant dry matter yield
responses. Soil application rates are calculated from nutrient properties
of the injected liquid and the water holding capacity of the soil.
The SIVs are able
to load from either road tankers, ground tanks, or lagoons. To load
the vehicle an inductor valve is opened from inside the cab with a pressure/vacuum
pump filling the 15,000 litre tanks within minutes. All self propelled
units are full-time four-wheel-drive, whilst tractor-drawn machines
are pulled by four-wheel-drive tractors.
This injection system
allows liquids to be placed deep into the rooting zone of selected crops
or pastures, thereby maximising plant uptake and minimising soil leaching,
surface run-off and odour.
Liquids are distributed
through the soil profile under a radial expansion pattern from a heavy
duty injection system which may reach down 350mm into the soil. High
speed dispersal means large areas of land are able to be improved each
day. The vehicles high flotation tyres distribute the weight of
each machine for a surface pressure of only 15 lb per sq inch, effectively
preventing soil compaction.
liquid management programme represents a great opportunity for the agricultural
industry to benefit from valuable components of liquid organic waste