PUMPING-UP METHOD FOR UNDERGROUND WATER TO BE PRESSURIZED FROM GROUP WELL ATTENDED WITH WATER INJECTION

摘要

PURPOSE: To increase water injection ability and pumping-up ability with a time by a method wherein refuse and a contaminating material needing monitoring, contained in injection water, are removed, and during water injection, water injection ability is increased by means of a vacuum deaerating device, all of a well group forms a well used for both water injection and pumping-up, and water injection and pumping-up are repeated in a given order. ;CONSTITUTION: A floating material contained in precipitation (a) and surface water (b), collected in a water collection passage 1, is removed by a screen 2 and mixed soil is removed by a filtering device 3, and water passing therethrough is stored in a first tank 4. It is decided by a water quality measuring device 5 whether each of water qualities, needing monitoring, of stored water exceeds allowable concentration. When concentration of any water is below an allowable concentration the water is caused to pass through a vacuum deaerating device 7 to remove gas dissolved in water. A water injection well is determined, in an order, decided on a basis of the magnitude of a quantity of water injected for a time in which an injection wall level (e) in each well 17 at a current point of time is increased to an upper limit water level (d). When a water level in a water injection well is increased to the upper limit water level (d) through injection of water, injection of water is stopped and water injection is transferred to a well 17 in a next order.;COPYRIGHT: (C)1994,JPO