NOVELTY - Heterotrophic ecologic method comprises using collecting well, sand settling pond, regulating pond, hydrolysis pond, sterilizing tank, culture liquid batching tank, large pneumatic pushing photo-biologic reactor and air floating tank production apparatus; batching micro-alga culture liquid from raw eutrophic water; breeding and collecting micro alga with eutrophic water and waste carbon dioxide waste gas; and treating air floated and collected clear liquid with ecological substrate to obtain water with standard quality over grade V.    USE - Heterotrophic ecological method for recovering eutrophic water (claimed).    ADVANTAGE - The method breeds micro alga with eutrophic water and waste carbon dioxide waste gas, absorbs massive nutrient salt e.g. nitrogen and phosphorus in eutrophic water, thus recovering eutrophic water in heterotrophic ecological mode.    DETAILED DESCRIPTION - Heterotrophic ecological method comprises:    (A) batching micro-alga culture liquid from raw eutrophic water, selecting water gap along upstream of eutrophic water, pumping raw eutrophic water into collecting well on bank via water pipe, with metal net arranged at water pipe orifice, removing mud and sand from raw water from collecting well via sand settling pound, and regulating quality and amount in regulating pond;    (B) decomposing long-chain and macromolecular organic substances into short-chain and micromolecular organic substances in hydrolysis pond, filtering sand from hydrolyzed raw water and feeding into sterilizing tank, adding disinfectant to kill protozoan and impure alga, adding neutralizing agent and standing liquid;    (C) adding sterilized raw water into micro-alga culture liquid batching tank, diluting collected clear liquid with clear water or air, with adding nutrient salt according to breeding prescription of the micro alga in the eutrophic water to prepare micro-alga culture liquid;    (D) breeding and collecting micro alga with eutrophic water and waste carbon dioxide waste gas, carrying out three-grade culture in triangular flask, air lifting photo-biologic reactor and small pneumatic pushing photo-biologic reactor in turn to obtain industrial alga for industrial production apparatus having large pneumatic pushing photo-biologic reactor arranged outside in parallel in rows and lines;    (E) adding culture liquid into reactor to 10 cm, turning up ventilating device for main flowing of culture liquid, inoculating industrial alga, adding culture liquid gradually to 20 cm, continuously filling waste carbon dioxide gas with 1-5% content of carbon dioxide diluted by air in day, filling filtering air at night and controlling temperature of culture liquid at 15-35 degrees C by filling heat/cold air, ventilating through shutter, shielding and regulating temperature, steam/hot water insulating;    (F) reducing supplementing liquid via supplementing pipe having nutrients inside the nutrient liquid or reducing alga level, maintaining liquid level at 30 cm, collecting micro alga randomly according to concentration of the micro-alga culture liquid, discharging alga liquid by opening valve of the liquid discharge pipe, stopping discharging when liquid level inside the large pneumatic pushing photo-biologic reactor at 15-20 cm, and controlling collecting rate each time at 10-30%;    (G) collecting micro alga by filling waste carbon dioxide gas into air floating tank, supplementing dissolved carbon dioxide into micro-alga culture liquid, spraying and drying collected micro alga to obtain fine alga powder, treating air floated and collected clear liquid with ecological substrate, diluting raw eutrophic water with collected clear liquid with air floating method and pumping rest clear liquid into a water channel or river with ecologic substrate;and    (H) oxygenating in aerating mode, growing biomembrane on surface of ecologic substrate by taking clear liquid flow through ecologic substrate, removing residual nitrogen, phosphorus and organic substances from clear liquid during contacting process of clear liquid with biomembrane with effect of high-efficiency microorganism to meet standard over grade-V of surface water, and discharging water to downstream of eutrophic water.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the Heterotrophic ecological method (Drawing includes non-English language text).