NOVELTY - The method comprises introducing wastewater including metal-containing substances into a basin (1), mixing wastewater with compressed gas in the basin, maintaining, in the basin, a microbial consortium comprising a concentration of microorganisms that consume nitrogen-, phosphorus-, sulfur- or metal-containing substances, and discharging the wastewater. The mixing step comprises generating turbulence from a bottom of the basin to a top of the basin. The compressed gas is released from a position having a depth of deeper than 70% of the entire depth of the basin.    USE - The method is useful for treating wastewater from an oil industry, a natural gas industry, a mining industry, a power generation industry and a desalination industry (all claimed) and for production of biomass concentrates and further extract or processed matter used: for production of lipids, amino acids, polysaccharides and hydrocarbons; as animal feed and human food; for production of nutritional supplements and cosmetics; as chemical precursors for industrial applications; as raw materials for the production of biofuels, biodiesels, biogas, jet fuels, and electricity; and as biomaterials for removal of toxins, organic pollutants and metals from a water system.    ADVANTAGE - The method is capable of economically and efficiently recovering the solids from the wastewater with less consumption of energy and chemical compounds, thus providing highly cleaned water with reduced amount of hazardous chemicals, unwanted nutrient values and/or total solids.    DETAILED DESCRIPTION - The method comprises introducing wastewater including metal-containing substances into a basin (1), mixing wastewater with compressed gas in the basin, maintaining, in the basin, a microbial consortium comprising a concentration of microorganisms that consume nitrogen-, phosphorus-, sulfur- or metal-containing substances, and discharging the wastewater. The mixing step comprises generating turbulence from a bottom of the basin to a top of the basin. The compressed gas is released from a position having a depth of deeper than 70% of the entire depth of the basin. The method further comprising removing inorganic solids from the wastewater before discharging the wastewater. The wastewater flows into the basin at or more than 300 gallon/minute. The microbe consortium comprises more than 0.009 g/1 of suspended solids, and survives in a wastewater containing nitrogen and phosphorus ratio of 10:1. The method further comprises introducing hydrocarbon compound into the basin, retaining biologies contained in the wastewater discharged from the basin, re-introducing the retained biologies into the basin, maintaining the wastewater in the basin at a pH of 5.5-9.5, or at the wastewater inflow pH state, introducing carbon dioxide and/or bicarbonate into the basin, and recovering nutrients and/or biomass including biologies contained in the wastewater discharged from the basin. The wastewater treatment method is performed at a temperature of less than 15 degrees C. The metal-containing substances are consumed by adsorption.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a wastewater treatment system.    Basin (1)    Plant utilities (2)    End products of method (4)    Eukaryotes (7)    Micronutrients. (9)