NOVELTY - A bioreactor comprises circumfluence oxidation container, gas film separation-selection container, upflow regeneration container, solid-liquid separation container, and gas guide container. The circumfluence oxidation container equipped with clapboard inside is divided into fixed-type reaction area and suspension-type reaction area with fixed suspension through 1st liquid baffle plate set with 2 end openings and 2nd liquid flow guide hole in which liquid flows down the inner fixed reaction area and upward flow of suspension in the reaction zone.    USE - A bioreactor for sulfur- and nitrogen-containing wastewater treatment (claimed).    ADVANTAGE - The process does not require additional supplement of oxygen and saves energy consumption.    DETAILED DESCRIPTION - A bioreactor comprises circumfluence oxidation container, gas film separation-selection container, upflow regeneration container, solid-liquid separation container, and gas guide container. The circumfluence oxidation container equipped with clapboard inside is divided into fixed-type reaction area and suspension-type reaction area with fixed suspension through 1st liquid baffle plate set with 2 end openings and 2nd liquid flow guide hole in which liquid flows down the inner fixed reaction area and upward flow of suspension in the reaction zone. The interior of fixed reaction area has a gas distribution plate with multi-holes and filled with filler, and filler material is filled between 1st liquid and 2nd liquid flow guide openings. Upper part of fixed reaction area has 1st air outlet, bottom part has sludge port, outer end has 1st water inlet, lower end has 1st air inlet, water inlet is higher than 1st liquid flow guide hole, 1st air inlet is higher than 2nd liquid guiding port, and 2nd liquid flow guide hole is higher than sludge port. Suspension-type reaction area of water outlet is opened at the bottom. The bottom of gas film separation-selection container is set with 2nd air outlet, a side wall is set with 2nd air inlet, other side wall is set with 3rd air outlet, 2nd air inlet and 1st air outlet are connected, and multi-gas separation membrane module is set inside the container and connected through a pipeline to main pipeline. The 2nd outlet is connected to 1st air inlet set with 1st vacuum pump. Interior of solid-liquid separation container has solid-liquid separation membrane module, upper end is set with water outlet, lower end is set with 3rd air inlet, water outlet is connected through a pipeline to circulation pump and 1st water inlet, 3rd air inlet is connected with air outlet, and 3rd air inlet and 3rd air outlet are set with 2nd vacuum pump. The bottom of upflow regeneration container has 2nd sludge port, upper part has air outlet, one side wall at upper end has 2nd water inlet connected to other side wall at lower end through connected solid-liquid separation container. Gas guide container has 1st gas guide hole on one side wall at upper end connected to fixed liquid separation container, and other side wall at lower end has 2nd gas guide hole connected to upflow regeneration container. An INDEPENDENT CLAIM is included for sulfur- and nitrogen-containing wastewater treatment.