GRANULAR MAGNESIUM BASED IMPROVING AGENT FOR WATER QUALITY AND BOTTOM MATERIAL QUALITY

摘要

PROBLEM TO BE SOLVED: To inexpensively reform the degraded water quality and bottom material quality of a closed water basin by granulating a material composed of magnesium based powder and granular raw materials to a specific particle size and forming the improving agent in such a manner that the particles of the specific very small particle size at the time the occurrence of the self-collapse after charging in the water attain specific weight %. SOLUTION: This magnesium based reforming agent is used for improving the water quality and bottom material quality of the closed water basin having a large pollution source in the hinterland, uniformly disperses in the form of fine particles by collapsing after charging in the water in the area to be reformed and is capable of maintaining the reforming function over a long period of time. The reforming agent described above is so formed that the size of the materials composed of the magnesium based powder and granular material is <=20μm in particle size and that the particles of <=0.1mm at 60 minutes after charging attain 10wt.%. Magnesium hydroxide and/or magnesium oxide is mainly used for the magnesium based powder and granular raw material. The reforming agent is so formed that its bulk density attains a range of 0.1 to 2.3g/cm<2> and further that the content in terms of MgO attains >=30wt.% and the adhered moisture <=20wt.%.