Organic Waste Recycling

452 Organic Waste Recycling: Technology and Management

Topographical and seasonal suitability Can be used in sloping land; can be used year-round if the pipe is drained in winter; not suitable for application to some cr

ops during growing

season; odour (aerosol) nuisance may occur. Between 0.5 and 1.5 % slope depending on percentage solids; can be used

from rows of crops.

Can be applied from ridge roads. Tillable land; not usable with row crops or on soft ground. Tillable land, not usable with row crops or on soft ground. Tillable land; not usable on wet or frozen ground. Tillable land, not usable on wet or frozen ground.

Characteristics Large orifice required on nozzle; large power and lower labour requirements; wide selection of commercial equipment available; sludge must be flushed from pipes when irrigation completed Land preparation needed; lower power requirements than spray. Used on sloping ground with vegetation with no runoff permitted: suitable for emergency operation; difficult to get uniform aerial application. Capacity 500 to more than 2,000 gal; large volume trucks will require floatation tires; can use with temporary irrigation set up; with pump discharge can spray from roadways on to field. Capacity 500 to 3,000 gal; larger volume will require floatation tires; can use with temporary irrigation set-up; with pump discharge can spray from roadways on to field. Use with pipelines or tank truck with pressure discharge; hose connected to manifold discharge on plow or disc. 500 gal. Commercial equipment

available; sludge

discharged in furrow ahead of plow mounted on rear of four wheel-drive truck.

Table 9.7 Application methods and equipments for liquid and some semi-solid sludge MethodIrrigation Spray (Sprinkler) Ridge- and- furrow Overland flow Tank truck Farm tank wagon and tractor Flexible irrigation hose with plow furrow or disc cover Tank truck with plow furrow cover