Device and method for synchronous treatment of flue gas desulfurization wastewater and denitrification wastewater based on microbial synergy

Abstract

The invention relates to a device and method for biological denitrification and desulfurization of wastewater, and a device and method for synchronous treatment of flue gas desulfurization wastewater and denitrification wastewater based on the synergistic effect of microorganisms. Including the tank, the upper part of the tank is a solid-liquid-gas separation zone, and the lower part is a reaction zone; the reaction zone is an inner and outer nested structure, the inside is a suspended sludge reaction zone, and the outside is a biofilm reaction zone; the sampling port at the upper end of the tank I is connected to the lower sampling port II through a circulation pipe and a circulation pump; the biofilm reaction zone is filled with five layers of packing; the solid-liquid-gas separation zone includes a gas collection chamber and a sludge settling chamber. The invention integrates sulfate reduction and concurrent desulfurization and denitrification reactions, realizes the spatial separation of functional microorganisms, and synchronously treats SO in flue gas desulfurization wastewater and denitrification wastewater 4 2‑ and NO 3 ‑ , simplifies the operation process, reduces the floor space, and SO 4 2‑ eventually converted to S 0 , which reduces the formation of H 2 S causing the risk of secondary pollution.

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...

AI Technical Summary

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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