A method for degrading an organism includes steps as follows. A composite structure is provided, wherein the composite structure includes a degradation activity donor and a supporter. The degradation activity donor has a piezoelectric property. The supporter carries the degradation activity donor, wherein the degradation activity donor is completely or partially covered by the supporter. A contacting step is conducted, wherein the composite structure is contacted with a medium. The medium includes at least one organism and water. A degrading step is conducted, wherein a mechanical perturbation is generated in the medium to polarize the degradation activity donor, and a separation of an electron-hole pair is generated for degrading the organism.

The present disclosure describes a process for producing a reducing liquid comprising providing a liquid: providing a reducing gas and/or a metasilicate; and infusing the reducing gas and/or the metasilicate to the liquid, for the reducing gas and/or metasilicate to react with the liquid to produce a reducing liquid that has an oxidation reduction potential (ORP) value of about 100 mV or more negative. Further described is the process for preparing a reducing gas, which includes the steps of preparing an activator, introducing the activator into an electrolytic reactor, adding water, and applying a direct current to produce the reducing gas. Also described is a system for producing a reducing liquid.