Flue gas desulfurization wastewater and denitration wastewater synchronous treatment device and method based on microbial synergistic effect

Abstract

The invention relates to a wastewater biological nitrogen and sulfur removal device and method, in particular to a flue gas desulfurization wastewater and denitration wastewater synchronous treatmentdevice and method based on a microbial synergistic effect. The device comprises a tank body, the upper part of the tank body is a solid-liquid-gas separation area, and the lower part of the tank bodyis a reaction area; the reaction area is of an internal-external nested structure, the internal part is a suspended sludge reaction zone, and the external part is a biological membrane reaction zone;the upper end sampling port I and the lower end sampling port II of the tank body are communicated with a circulating pump through a circulating pipe; the biological membrane reaction zone is filled with five layers of fillers; the solid-liquid-gas separation area comprises a gas collection chamber and a sludge settling chamber. Sulfate reduction and mixotrophic desulfurization and denitrificationreactions are integrated, space separation of functional microorganisms is achieved, SO4 < 2-> and NO3 <-> in flue gas desulfurization wastewater and denitration wastewater are synchronously treated,the operation process is simplified, the occupied space is reduced, SO4 < 2-> is finally converted into S0, and the risk of secondary pollution caused by H2S generation is reduced.

Description

technical field [0001] The invention relates to a waste water biological denitrification and desulfurization device and method, in particular to a device and method for synergistic removal of sulfate and nitrate in flue gas washing waste water. Background technique [0002] The problem of air pollution caused by flue gas emissions has gradually attracted the attention of countries all over the world. Flue gas pollution mainly comes from the sulfur oxides SO contained in the flue gas X , Nitrogen oxide NO X Many countries have limited the concentration of pollutants in flue gas emissions and increased emission control requirements, such as formulating a series of local flue gas pollutant emission standards and national flue gas emission control plans. for SO X , Nitrogen oxide NO X And the treatment of soot particles, the most widely used method at present is the wet scrubbing method, that is, the flue gas is washed separately with the washing solution containing alkaline...

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Problems solved by technology

The essence of this method is to turn water pollution into air pollution again, and its secondary pollution phenomenon is particularly serious, and it can treat the symptoms but not the root cause; chemical precipitation can also be used to remove SO in water 4 2- , that is, adding chemical agents containing metal ions to make the metal ions and SO 4 2- The formation of precipitates is removed from water, but the cost of metal ion chemicals used in this method is high, and the resulting precipitates are difficult to handle; for the NO contained in the waste liquid 3 - , the commonly used method is the denitrification method, that is, under the action of microorganisms, NO 3 - Revert to Nitrogen Evacuation

This method of itemized treatment of two waste liquids requires two sets of devices, which is costly and complicated to manage.

Membrane methods such as osmosis and reverse osmosis can be used to simultaneously remove SO from wastewater 4 2- and NO 3 - , but SO 4 2- and NO 3 - The removal efficiency is limited by the quality and cost of the membrane, and the permeable membrane is easily polluted or damaged. This method is not suitable for the treatment of flue gas scrubbing waste liquid with a large amount of water.

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