A treatment device and method for desulfurization and denitrification wastewater in thermal power plants

Abstract

The invention belongs to the technical field of sewage biological treatment, and particularly relates to a processing device and a method for thermal power plant desulfurization and denitrification waste water. The method comprises the following steps: firstly, pumping the thermal power plant desulfurization and denitrification waste water into a raw water tank, entering a coagulation reaction tank, adding PAC (poly aluminium chloride) and PAM (polyacrylamide) to remove heavy metal and suspended matters in sewage, and meanwhile, controlling a pH (Potential of Hydrogen) value; after the sewageprecipitation, entering an aerobic reaction tank to carry out half short range nitration reaction, entering a secondary sedimentation tank to be subjected to sludge and water separation, causing residual sludge parts to flow back to the aerobic reaction tank, and causing effluent to enter a middle water tank; then, causing the sewage to enter an anaerobic ammonia oxidation reactor, utilizing original ammonia nitrogen in the sewage and nitrite nitrogen generated in the aerobic reaction tank to carry out anaerobic ammonia oxidation denitrification, subsiding, discharging water, and enabling theeffluent to enter a denitrification reactor to further remove nitrogen. The device has the advantages of simple structure, convenience in operation, simple technical process, low energy consumption, no additional carbon sources, low operation cost and wide application prospect, and the deep denitrification treatment of thermal power plant waste water can be realized.

Description

Technical field: [0001] The invention belongs to the technical field of sewage biological treatment, and relates to a treatment device and method for desulfurization and denitrification wastewater in thermal power plants, in particular to a device and method for treating desulfurization and denitrification wastewater in thermal power plants with semi-short-range nitrification combined with anaerobic ammonium oxidation. Background technique: [0002] The tail liquid of flue gas denitrification in thermal power plants comes from the denitrification device. The main pollutants in the tail liquid of desulfurization and denitrification in thermal power plants include: organic matter (BOD, COD), total nitrogen (TN), ammonia nitrogen (NH 4 + ), suspended solids (SS), sulfate (SO 4 2 -) and heavy metals, etc., the water quality characteristics are as follows: low concentration of organic matter, poor fertility (B / C ratio lower than 0.05); high concentration of total nitrogen and a...

AI Technical Summary

Problems solved by technology

For the high ammonia nitrogen denitrification tail liquid with poor biodegradability, if the conventional biological treatment technology is used, a large amount of additional carbon source must be added to ensure the biological reaction requirements, and the high ammonia nitrogen concentration will induce the generation of free ammonia (FA), which will affect the denitrification system. The microorganisms in the sludge will have an inhibitory effect, and when the concentration is high, it will affect the operation of the biochemical denitrification reactor, and even cause the reactor to completely lose its function; for the salinity in the sewage, ordinary activated sludge cannot treat wastewater with high salt content ; For sulfate in sewage, it is easily decomposed by sulfate-reducing bacteria (SRB) to generate hydrogen sulfide under anaerobic conditions, and hydrogen sulfide has strong toxicity, which will lead to a decrease in the treatment efficiency of the biological treatment system

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