injection of liquid waste into depleted hydrocarbons reservoirs

Recently waste disposal has become a huge problem as its uncontrolled accumulation may become a serious source of environment pollution particularly for surface and ground water.Storage of liquid waste into depleted hydrocarbon reservoirs, or into closed ones but also into partly-opened hydrogeological structures that separated from active circulation of underground water that are permanently out of environmental sphere is the most effective way of liquidation especially if the current production wells can be used