NOVELTY - The method for the recovery of chemicals from sewage that arises during the production of fibrous material from lignocellulose raw material under use of sulfur salt, comprises subjecting the sewage to an anaerobic sewage treatment for producing sulfur and/or sulfur compounds and then for producing methane and/or carbon dioxide. Low molecular oxygen-containing substances are converted during the production of sulfur and/or sulfur compound and high molecular oxygen-containing substances are converted during the production of methane and/or carbon dioxide.    USE - Method for the recovery of chemicals from sewage that arises during the production of fibrous material from lignocellulose raw material under use of sulfur salt.    ADVANTAGE - The method ensures simple, efficient and economic recovery of chemicals from sewage with high yield and low operating and investment cost by requiring less quantity of chemicals.    DETAILED DESCRIPTION - The method for the recovery of chemicals from sewage that arises during the production of fibrous material from lignocellulose raw material under use of sulfur salt, comprises subjecting the sewage to an anaerobic sewage treatment for producing sulfur and/or sulfur compounds and then for producing methane and/or carbon dioxide. Low molecular oxygen-containing substances are converted during the production of sulfur and/or sulfur compound and high molecular oxygen-containing substances are converted during the production of methane and/or carbon dioxide. Sulfur, hydrogen sulfide and sulfur dioxide produced during the anaerobic sewage treatment are converted to sulfur salt for the production of fibrous material. The methane and the carbon dioxide produced during the anaerobic sewage treatment are used for energy production. Filtrate containing carbonate is used for the production of sulfur salt. The sulfur salt (75%) contained in the sewage is converted into sulfur and sulfur compound through the anaerobic sewage treatment. Psychrophilic, mesophilic or thermophilic microorganisms are used for the sewage treatment. Chemical oxygen demand (50%) available in the sewage is removed through the sewage treatment. The chemical oxygen demand content of the sewage is 40-100 g/l. An oxidizing pretreatment is carried out before the anaerobic sewage treatment.