Device and method for advanced treatment of salt-containing wastewater

Abstract

The invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for advanced treatment of salt-containing wastewater. The salt-containing wastewater enters a short-cut denitrification SBR reactor from a salt-containing wastewater tank through a first water inlet pump; in a short-cut denitrification SBR reactor, nitrate nitrogen of the salt-containing wastewater is reduced into nitrite nitrogen by utilizing a carbon source in the sludge fermentation liquor; in an anaerobic ammonia oxidation SBBR reactor, anaerobic ammonia oxidation bacteria takea reduction product nitrous acid nitrogen and ammonia nitrogen in inlet water as substrates to carry out autotrophic nitrogen removal, so that the purpose of deep nitrogen removal is achieved; afterthe anaerobic ammonia oxidation stage is finished, precipitation and drainage are carried out, and effluent enters an effluent tank through a second electric drainage valve; the device is simple in structure, realizes deep denitrification of the salt-containing wastewater under the condition of not additionally adding an organic carbon source, is low in operation cost, low in sludge yield and easyto operate and regulate, can be used for treating the salt-containing wastewater of coastal cities, and provides theoretical basis and technical support for treating the salt-containing wastewater ofcoastal urban sewage treatment plants.

Description

Technical field: [0001] The invention belongs to the technical field of sewage biological treatment, and relates to a device and method for advanced treatment of saline wastewater, in particular to a device and method for sludge fermentation enhanced short-range denitrification anaerobic ammonium oxidation treatment of saline wastewater. Background technique: [0002] With the gradual increase of sewage discharge standards, it is imperative to improve the standard of urban sewage treatment plants, and the bottleneck lies in improving the total nitrogen removal effect. In order to protect the environment, domestic sewage plants have gradually begun to upgrade and renovate, so that the effluent water quality standard can reach the first-class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002). The removal of total nitrogen is particularly important in the upgrading and transformation of sewage plants, which is the most difficult...

AI Technical Summary

Problems solved by technology

Most of the denitrification treatment technologies for saline wastewater use biochemical treatment methods, but due to the variability and the existence of refractory organic pollutants, it is often difficult for conventional biochemical treatment processes to be effective, so that the treated wastewater cannot meet the national discharge standards. , so that the entire sewage denitrification treatment project cannot achieve the expected purpose

Therefore, there is an urgent need for a stable, high-efficiency and low-energy-consumption new saline wastewater denitrification process. The sludge fermentation liquid is injected into the enhanced short-range denitrification and anaerobic ammonium oxidation combined process to treat saline wastewater, so as to solve the carbon source shortage of the traditional denitrification process. , Stable accumulation of nitrite in sewage

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