Publisher Summary Protection of the environment from pollution caused by wastes is a matter of increasing concern. It can be a technically complex exercise because the variety of waste is extremely wide. The volumes may be large, and the levels permissible for release may be very low. Waste treatment prior to disposal may introduce phase changes, which result in quite different pollution control considerations. The two different, but related, considerations in waste disposal are hazard control and loss prevention in the treatment and disposal operations, and the control of environmental hazards. The measures necessary with solid wastes may differ, particularly if they are heterogeneous in nature and disposed of on land.