A new high-concentration powder carrier biological fluidized bed process for treating urban sewage

Abstract

The present invention relates in general to municipal wastewater treatment, and in particular, to a new biological fluidized bed process with high concentration powder carriers used for the treatment of municipal wastewater, wherein the process comprises: flowing the wastewater through a coarse screen and a lifting pump firstly, lifting to a fine screen and grit chamber, and then entering a HPB biochemical tank; dividing the HPB biochemical tank successively into an anaerobic zone, an anoxic zone, an aerobic zone and a concentrated separation zone along the flow direction of the wastewater, adding a compound powder carrier to the anaerobic zone, the anoxic zone and the aerobic zone respectively, and stirring and mixing into a mixture; flowing the mixture into the concentrated separation zone and concentrating and separating, returning the concentrate back to the anaerobic zone; discharging the supernatant from the concentrated separation zone and successively transporting through a high-efficient clarification tank, a filter tank and a disinfection tank to be purified; transporting the discharged excess sludge to a cyclone separation and recovery system; the separated compound powder carrier will be recycled to HPB biochemical tank. The HPB process in the present invention is a highly integrated municipal wastewater treatment process, in which only one lifting operation is required. In addition, it has a small land area, a low operating energy consumption and a high treatment efficiency.

Description

technical field [0001] The invention relates to urban sewage treatment, in particular to a novel high-concentration powder carrier biological fluidized bed process for urban sewage treatment. Background technique [0002] The pollutant discharge standards implemented by sewage treatment plants in most parts of China are the first-class B standards of the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" (GB18918-2002); many areas are raising the discharge standards to first-class A standards; and some More stringent local standards are also being promulgated one after another, for example, Hunan Province will implement the "Discharge Standards for Main Water Pollutants of Urban Sewage Treatment Plants in Hunan Province" (DB43 / T 1546-2018) from March 25, 2019. The concentration limits of the main pollutants in the discharge water in the above standards are shown in Table 1. Moreover, along with social progress, the emission standards in various places sti...

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Problems solved by technology

The biggest problem in this kind of sewage treatment process is that there are many treatment units; the sewage has undergone multi-stage biochemical, physical and chemical treatment, and there is a problem of elevation connection between the units, so secondary upgrading is inevitable, resulting in lengthy treatment process and high energy consumption. high

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