PREVENTING METHOD OF DEGRATION IN WATER QUALITY IN CLOSED SEA AREA AS WELL AS LAKE AND POND

摘要

PURPOSE:To introduce oxygen into bottom water layers without breaking metalimnion layers and without disturbing bottom deposits by supplying gaseous oxygen to the water lump in the bottom water layers under the metalimnion layers by the negative pressure developed by sucking part of said water mass continuously with a lifting pump. CONSTITUTION:The water in closed sea areas, lakes and ponds is bisected to a surface water layer B and a bottom water layer C as a metalimnion layer A is formed thereon. An underwater lifting pump 1 is anchored to a buoy 2, and is suspended down to the prescribed water depth position, where the intake port 3 thereof is located in the layer C and the pump is driven. Part of the water mass formed by the layer C is sucked through the port 3, and is discharged through a discharge port 9', whereby negative pressure is generated around the vanes of the pump 1. The terminal end of a gaseous oxygen pipe 8 from an oxygen supply device 7 is fixed at the lace where the negative pressure is developed. Then, gaseous oxygen is contained in the water passing through the pump 1 whereby the concn. of the dissolved oxygen in the water mass of the layer C is increased and the greater part of the chemical materials are oxidized to a harmless state.