TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In (M1), the heterotropic bacteria are Comamonas testosteroni. The autotropic bacteria are Thiobacillus ferroxidans. The pH of the wastewater in the reaction tank is adjusted to 3.0-4.0, and the trivalent iron hydroxide (III) is formed subsequent to the oxidation of bivalent ion to trivalent ion in the wastewater. (M1) involves supplying polyurethane foam in the reaction tank, adding the wastewater adjusted to pH of 1.5-2.0 into the reaction tank, where the bivalent ion in the water is oxidized to trivalent ion, recovering the treated water from the reaction tank and supplying to a pH control tank, carrying out neutralization processing of the treated water in the pH control tank and adjusting the pH of treated water to 4-5 and forming iron hydroxide (III), supplying the pH controlled treated water to a sedimentation basin and allowing to precipitate, separating deposit containing iron hydroxide (III) from the supernatant liquid and recovering the deposit. The reaction tank comprises a membrane module consisting of hollow fiber membrane, where the treated water from the reaction tank is passed through the membrane module to the pH control tank. The iron-bacterium utilize 1-10 mg/l of hydrogen and 0.1-5 mg/l of phosphorus contained in the wastewater, as nutrition. The treated water from the sedimentation basin is separated and a part of the water is returned to the reaction tank, and the other part is precipitated and the deposit recovered. The pH control tank and the sedimentation basin are provided at the later stage of the processing method. In (M1), the mixed liquor suspended solid (MLSS) activated sludge liquid mixture solid concentration in the reaction tank is 3-10 mass%. The reaction tank the sedimentation basin are integrated. The recovery of iron hydroxide (III) present in the treated water of the sedimentation basin is carried out by a filter apparatus or a membrane separator installed in the later stage of the sedimentation basin. The iron hydroxide (III) recovered from the wastewater is recycled as a blast furnace raw material. In (M1), ferric chloride or ferric sulfate aqueous solution used as water treatment coagulant is supplied to remove impurities. The iron hydroxide (III) (1-10 mass%) recovered from the wastewater is mixed with MLSS concentration in the wastewater treatment reaction tank in the presence of charcoal to prevent aggregation of activated sludge in the reaction tank. The wastewater containing zinc ion and/or nickel ion is processed and the pH of the treated water is adjusted to 9-10 such that hydroxide of zinc and/or nickel is formed. The formed hydroxide is separated and recovered using sedimentation basin, filter apparatus or membrane separator. The treated water is allowed to flow through a chelate resin and/or an acidic cation exchange such that the zinc ion or nickel ion is adsorbed by the resin, eluted using sulfuric acid or hydrochloric acid and recovering zinc or nickel. The recovered nickel and/or zinc hydroxide is recycled as a non-ferrous raw material or as a plating solution. The zinc or nickel metal aggregate is manufactured using the galvanostatic process of an electrolytic-winning method from the recovered zinc or nickel ionic solution.