Process and device for integrated denitrification, carbon and phosphorus removal for advanced treatment of printing and dyeing wastewater

Abstract

The invention discloses an integrated denitrification, carbon and phosphorus removal process and device for advanced treatment of printing and dyeing wastewater. The device includes a water inlet pool, the water inlet pool is connected with the water inlet pump, the water inlet pump is connected with the filter tank, the upper part of the filter tank is provided with a water outlet sump, the water outlet sump is connected with the outlet water channel, and the outlet water channel is respectively connected with the outlet pipe, backwash The drain pipe and the nitrifying liquid return pipe are connected; the filter tank is connected to the outlet end of the blower through the air main pipe. The process of denitrification, carbon removal and phosphorus removal is as follows: the secondary biochemical effluent of printing and dyeing wastewater enters the first filter material layer, and the iron-biomass carbon reduction of refractory organic matter in the wastewater is reduced to open-loop and broken chain, and phosphorus is removed at the same time; the treated wastewater Enter the second filter material layer on the upper layer to remove refractory organic matter in the wastewater, and convert the ammonia nitrogen in the wastewater into nitrate nitrogen; the effluent from the upper layer of the filter is returned to complete the denitrification process. The invention completes the processes of carbon removal, nitrogen removal and phosphorus removal in the same filter tank without adding denitrification carbon source, easy operation and management, and low investment and operation costs.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a process and device for synchronous denitrification, carbon and phosphorus removal for advanced treatment of printing and dyeing wastewater. Background technique [0002] At present, the wastewater discharge standards of textile printing and dyeing industrial parks generally implement the first-level B or even first-level A standards in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and it is difficult to meet the discharge requirements stably by relying on traditional physical, chemical and biochemical secondary treatments . On the basis of the secondary biochemical treatment, the tertiary advanced treatment is added to further remove the remaining refractory organic matter, nitrogen, and phosphorus pollutants in the printing and dyeing wastewater, which is an important goal of wastewater treatment upgra...

AI Technical Summary

Problems solved by technology

However, the problem in engineering application is that the effect of denitrification and phosphorus removal is unstable, especially for industrial wastewater containing toxic substances. The denitrification and phosphorus removal bacteria are often inhibited, and the secondary biochemical effluent is difficult to meet high standards for discharge. Require

However, the advanced treatment technology aimed at removing organic matter in the above-mentioned engineering applications does not have the function of nitrogen and phosphorus removal.

If the biological nitrogen and phosphorus removal technology is used in the advanced treatment, it will face the problem of insufficient organic carbon source, while the chlorine oxidation denitrification, flocculation and phosphorus removal technologies will have high operating costs, serious secondary pollution and coagulation of sludge. The problem of high yield

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