System and method for synchronously realizing industrial circulating water softening and sewage phosphorus recovery

Abstract

The invention relates to a system and method for sewage treatment, particularly to a system and method for synchronously achieving softening of industrial circulating water and recovery of phosphorus in sewage. At the aim of the problems of instability in the existing biological phosphorus removal technology, high quantity of reagent in the chemical phosphorus removal technology, desalination of the industrial circulating water and the like, a domestic sewage treatment system and an industrial circulating water and blow-off water side softening treatment system are coupled, an alkaline and medium-high temperature temperature provided by circulating-hot-water blow-off water is utilized, and Ca2+ which the circulating-hot-water blow-off water is rich in is used as metal salt and reacts with PO43- in domestic sewage. By the optimizing effect of a regulating system, conditions are created for efficiently and economically implementing the precipitation reaction of Ca2+ and PO43- so as to synchronously soften the industrial circulating water and recover the phosphorus element in sewage.

Description

Technical field [0001] The invention relates to a novel sewage treatment system and method, in particular to a system and method for synchronously realizing industrial circulating water softening and sewage phosphorus recovery. Background technique [0002] Compared with municipal sewage, factory production and domestic sewage are usually subject to stricter treatment and discharge standards due to their potential hazards. In the existing industrial parks, due to its relatively mature municipal supporting pipe network, most of the sewage in the plant area only needs to be treated and discharged into the municipal drainage pipe network after reaching the third-level standard of the Comprehensive Wastewater Discharge Standard. For many newly-built industrial parks, sometimes due to the lack of synchronization of municipal supporting facilities, sewage and wastewater often need to be strictly treated in the plant area. After reaching the first-level standard of the "Integrated Waste...

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Problems solved by technology

[0007] The Chinese patent with application number 200910115969.2 titled a method for removing phosphorus in sewage, and the Chinese patent with application number 200710108304.X titled a method for removing phosphorus in urban sewage treatment plants discloses a method for removing phosphorus in sewage. However, like other existing technologies, there are unstable phosphorus removal technology, large dosage of chemical phosphorus removal, and Ca in the process of industrial circulating water use. 2+ Problems such as desalination of sewage with high concentration

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