Denitrogenation technique for waste water containing high concentration ammonia nitrogen

Abstract

The high concentration ammonia nitrogen waste water denitrogenating process is completed in the system comprising three units of nitrosating biomembrane reactor, anaerobic ammoxidation biomembrane reactor and soil treating unit. In the nitrosating biomembrane reactor, partial NH4-N in the waste water is oxidized into NO2-N. In the anaerobic ammoxidation biomembrane reactor, nitrite is reduced with NH4-N as electron donor, NH4-N is oxidized with nitrite as electron donor, and ammonia nitrogen and nitrite nitrogen are eliminated simultaneously. In the soil treating unit, water from the anaerobic ammoxidation biomembrane reactor is further treated through the capillary penetration, microbial degradation, soil grain filtering, ion exchange, adsorption and deposition of soil to eliminate the solid grain and dissolved components and to convert organic matter and nitrogen. The present invention can eliminate nitrogen in the condition of low C / N ratio and has low power consumption.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and belongs to a denitrification process for treating high-concentration ammonia nitrogen wastewater by using a bioreactor. Background technique [0002] High-concentration ammonia-nitrogen wastewater is difficult to treat and has serious environmental hazards, such as landfill leachate, sludge supernatant and some chemical industrial wastewater. The main water quality characteristics are: high ammonia nitrogen concentration and low carbon-nitrogen ratio (C / N). At present, the main technologies for treating nitrogen-containing wastewater at home and abroad include biological treatment and physical and chemical treatment. Although physical and chemical treatment technology has a good treatment effect, it is expensive, energy-consuming, and prone to secondary pollution. Biological treatment technology is economical and simple, etc. advantages and are widely used. [0003] Traditio...

AI Technical Summary

Problems solved by technology

For wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratio (C / N), it is difficult to denitrify effectively, resulting in low denitrification efficiency, and adding an external carbon source not only increases the treatment cost, but also easily causes secondary pollution;

[0016] (3) In order to neutralize the acidity produced by the nitrification process, it is necessary to add alkali to neutralize it, which increases the operating cost

[0017] (4) The process is complicated, and the return of sludge and mixed liquid increases the power cost

[0019] (1) It is necessary to set up a carrier stripping device and carry out carrier reflux, which complicates the operation

[0020] (2) In order to suspend and fluidize the carrier, a large reflux ratio is required, which increases energy consumption

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