Abstract: Disclosed herein is a biological method for aerobically treating whey using mushroom mycelia wherein the whey can be biologically treated at a disposal rate comparable to conventional methods. According to the method, since environmentally unfriendly sludge is not discharged, post-treatment operations in connection with the disposal of sludge can be simplified. Therefore, the method can lower environmental costs and further enables the economical cultivation of mushroom mycelia. Furthermore, the method has an advantage in terms of resource recycling.

Abstract: The present invention relates to a solar powered cathodic protection system using a photocatalyst which functions as a non-sacrificial photoanode under sunlight, wherein said non-sacrificial photoanode consisting of the photocatalyst such as TiO2 (or ZnO) and an electrolyte, is galvanically connected to a metal structure to be protected and continuously provides electrons to the metal structure, whereby the metal structure is protected from the corrosion. The solar powered cathodic protection system using a non-sacrificial photoanode according to present invention is advantageous in that 1) an external power supply is not necessary, 2) it is easy to maintain the system because the non-sacrificial photoanode according to the present invention can be installed outdoors, and 3) the photocatalyst used as the non-sacrificial photoanode is inexpensive and semipermanent.