Abstract: In treatment of water by injection of ozone into the water for removal of harmful matters, odor matters, and color matters therein, either or both of a nonyl phenol and a cresol are added to the water to be treated. The nonyl phenol is added together with a lower alcohol or acetone to the water to be treated. The cresol is added together with a lower alcohol or acetone to the water to be treated. A p-nonyl phenol is added as the nonyl phenol for treatment. As the cresol for addition, a p-cresol is added. As the nonyl phenol for addition, a nonyl phenol is used such that two molecular weights of 220 and 107 are detected when measured by either or both of gas chromatography and mass spectrometry. By the above treatment, the decomposition reaction of ozone can be accelerated, and thereby it becomes possible to accelerate the oxidative decomposition reaction of organic matters, the amount of ozone required for the decomposition of harmful matters can be reduced with the decomposition time.

Abstract: There is provided a culture medium for cultivating mushrooms whose material can be selected from a variety of woody materials and which can be transported in a compact form. There is also provided a method of cultivating mushrooms using such a culture medium in which pathogenic and other germs are less likely to breed and with which mushrooms can be cultivated in shorter periods. After adding nutrients such as rice and wheat brans, a mixture of dried sawdust and chip dust is heated at 150.degree.-500.degree. C. for 1-5 minutes under a pressure of 1.0-3.0 t/cm.sup.2 to form a cylindrical woody culture medium. The medium thus obtained is allowed to swell by adding water and then sterilized by sealing it in a bag. Mushroom fungi is then inoculated into it.