Anaerobic purification of wastewater, containing sulphate and organic material.

摘要

Wastewater containing sulphate and organic material is treated in a two-step anaerobic biological plant, in two fluidized bed reactors. In the first reactor (1) (acidification stage) at least 80% of sulphates are reduced to hydrogen sulphide which is then removed for at least 70% in a gas stripper (13) by a purge gas (12). The effluent from the stripper (13) is then digested in the second (methanic) reactor (22).