Land application of sewage sludge (biosolids) has been a worldwide agricultural practice for many years. It effectively disposes of a ‘waste’ product while recycling valuable nutrients into the soil–plant ecosystem; however, too often the dispersal has created environmental problems that force government agencies to restrict the amount and type of sewage sludge which can be land-applied. Various processes are employed to reduce any potential negative effect of sewage sludge application; composting wastes to stabilize the components is one process now used more frequently.