A sulfur autotrophic denitrification denitrification process

Abstract

The invention discloses a reaction device for sulfur autotrophic denitrification and denitrification, which comprises a main reactor, water inlet equipment, oxygen removal device, reflux device and acid-base dosing device; wherein, the main reactor is divided from bottom to top It is divided into four parts, which are water inlet mixing area, sulfur autotrophic denitrification area, anammox area and water outlet area in turn; the water inlet equipment is connected to the main reactor through water inlet A and water inlet B respectively. The influent mixing zone and the anammox zone; the reflux device includes a reflux pump and a water distributor; the reflux pump is connected to the anammox zone of the main reactor through a pipeline and the influent mixing area; the alkaline wastewater after the anaerobic ammonium oxidation reaction is circulated to the influent mixing area through reflux, and then enters the sulfur autotrophic denitrification area to reduce the additional alkalinity required for the sulfur autotrophic denitrification process and ensure the sulfur autotrophic denitrification process. The nitrification process was carried out smoothly.

Description

technical field [0001] The invention relates to the field of wastewater biological treatment, in particular to a sulfur autotrophic denitrification and denitrification reaction device. The invention is suitable for the biological denitrification treatment of waste water with high ammonia nitrogen and low C / N, such as coking waste water, gas waste water, breeding waste water and the like. Background technique [0002] With the rapid development of my country's petrochemical, metallurgy, food processing, livestock and poultry breeding and other industries, as well as the continuous acceleration of urbanization, a large amount of wastewater containing high concentrations of nitrogen is discharged into water bodies, causing eutrophication of water bodies and ecosystem disorders. On the other hand, nitrogen, as the energy source of nitrifying bacteria, consumes dissolved oxygen in water and causes water body hypoxia, while nitrate will be converted into nitrite under hypoxic condi...

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Problems solved by technology

However, the denitrification process of the existing sulfur autotrophic denitrification reactor consumes a large amount of alkalinity and produces sulfate as a by-product. According to accounting, every 1g of NO removed 3 - , will produce about 1.7 g of SO 4 2- , and then increase the salinity of the water body, causing the water body to turn black and smelly

[0005] CN107162184A discloses a UBF reactor utilizing anaerobic ammonium oxidation-sulfur autotrophic denitrification coupling denitrification and its system and denitrification method, which first converts part of the ammonia nitrogen in the influent into nitrite through nitrosation, Then the ammonia nitrogen and nitrite are reduced to nitrogen by anaerobic ammonium oxidation reaction, and finally the nitrate nitrogen produced by nitrification and anammox reaction is reduced to nitrogen by sulfur autotrophic denitrification, which overcomes the difficulty of nitrite accumulation, The problem that the anaerobic ammonium oxidation process cannot be carried out smoothly, but this method is based on anaerobic ammonium oxidation as the main reaction, the sulfur autotrophic denitrification process consumes a large amount of alkalinity, and the generation of by-product sulfate is still unavoidable, and this method It is necessary to control the conversion of part of ammonia nitrogen into nitrite nitrogen, the process is complicated, the energy consumption of the reactor is large, the operating cost is high, and the residual dissolved oxygen in the water inhibits the process of anaerobic ammonium oxidation and sulfur autotrophic denitrification, and the removal efficiency of total nitrogen is low

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