Tham khảo tài liệu 'environmental engineering dictionary and directory phần 5', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | IMF Protector Drinking water treatment system by Smith Loveless Inc. Imhoff cone Cone-shaped container used to determine the volume of settleable solids in a specific volume of water. Imhoff tank A two-story wastewater treatment tank developed by Karl Imhoff in which sedimentation occurs in the upper compartment and anaerobic digestion occurs in the lower compartment. Also called an Emscher fountain. immediately dangerous to life or health IDLH The maximum environmental concentration of a substance from which one could escape from a 30 minute exposure without irreversible adverse health effects. immiscible Incapable of being mixed. immunoassay The identification of a substance based on its capacity to act as an antigen. immunodeficiency A lack of one or more immune functions. Impac Packing media for air stripping towers by Lantec Products Inc. Impact Ion exchange resins by Sybron Chemicals Inc. impact fee Fee assessed new connections to a water or sewer system intended to recover a portion of the capital cost of the system. impeller The rotating set of vanes in a turbine blower or centrifugal pump designed to cause rotation of a fluid mass. Imperial gallon See gallon Imperial. impermeable strata Layers of clay or dense stone in the earth through which water cannot penetrate in measurable quantities. impervious Not allowing the passage of water at ordinary hydrostatic pressure. impingement 1 The entrapment of fish and other marine life on the surface of an intake screen when a high water velocity prevents escape. 2 The striking of a surface by a moving fluid. impoundment A pond lake or reservoir created through the use of a structural barrier such as a dam levee or dike. impressed voltage cathodic protection The use of an impressed current to prevent or reduce the rate of corrosion of a metal in an electrolyte by making the metal the cathode for the impressed current. Impulse Counter-current water softeners by USFilter Lowell. impulse turbine An energy recovery .
