Double sludge induced crystallization sewage water phosphorus removal denitrification method

Abstract

A method for dephosphorizing and denitriding induced crystallization sewage by a double-sludge system relates to the sewage treatment hard technology in environmental engineering, in particular to the economic and practical advanced technology applied to the dephosphorization and denitrification of domestic sewage and municipal sewage. The method is based on two independent sludge systems which are respectively a nitrobacteria sludge system formed by a nitrification tank (4) and a sedimentation tank (5) and a denitrification phosphorus accumulating sludge system formed by an anaerobic tank (1), a sedimentation tank (2), a hypoxia tank (6), a post aeration tank (7) and an end sedimentation tank (8); after denitrification phosphorus accumulating bacterial sludge finishes anaerobic phosphorus release in the anaerobic phosphorus release tank (1), sludge-water separation is carried out in the sedimentation tank (2), the sludge enters the hypoxia tank (6), and only the supernatant fluid enters the follow-up treatment unit; the sludge which is discharged into the hypoxia tank (6) undergoes denitrifying dephosphorization and denitrification and enters the end sedimentation tank (8) through the post aeration tank (7); and after precipitation and sludge-water separation, the phosphorus accumulating sludge enters the anaerobic phosphorus release tank (1) again to release phosphorus, and then the cycle goes on.

Description

technical field [0001] The invention is a sewage treatment engineering technique in environmental engineering, especially an economical and practical advanced technique for removing phosphorus and nitrogen from domestic sewage and urban sewage, and belongs to the technical field of environmental protection. Background technique [0002] In my country, the shortage of water resources and the problem of water pollution are becoming more and more serious. The total nitrogen and total phosphorus of the main lakes are seriously exceeding the standard. Phosphorus content in treated water has been highly valued. At present, the effluent of most urban sewage treatment plants is difficult to meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 Grade A Standard, and a considerable number of sewage treatment plants will face upgrading in the future The task of transformation, but the lack of carbon source, the contradiction of sludge age between phospho...

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Problems solved by technology

[0002] In my country, the shortage of water resources and the problem of water pollution are becoming more and more serious. The total nitrogen and total phosphorus of the main lakes are seriously exceeding the standard. Phosphorus content in treated water has been highly valued. At present, the effluent of most urban sewage treatment plants is difficult to meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 Grade A Standard, and a considerable number of sewage treatment plants will face upgrading in the future The task of transformation, but the lack of carbon source, the contradiction of sludge age between phosphorus accumulating bacteria and nitrifying bacteria, etc., are the main factors that limit the removal effect of nitrogen and phosphorus in existing urban sewage treatment plants, and there is an urgent need for new types of sewage phosphorus and nitrogen removal The technology fundamentally solves the contradictions existing in the traditional phosphorus and nitrogen removal technology, and realizes the stable and up-to-standard discharge of nitrogen and phosphorus

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