Reactor for realizing suspension of biofilm carriers under low aeration quantity

Abstract

The invention relates to a reactor for realizing suspension of biofilm carriers under low aeration quantity. The reactor comprises a vertical cylindrical shell, wherein a vertical hollow cylinder is coaxially arranged in the shell, and a stirring paddle is mounted in the hollow cylinder; a plurality of through holes are formed on the wall of the hollow cylinder; the bottom end of the hollow cylinder is fixedly connected with the bottom end of the shell; and the biofilm carriers are filled in a circular space between the hollow cylinder and the shell. According to the unique structure design of the reactor and the control to the rotating speed of the stirring paddle, the biofilm carriers in the reactor can be ensured always in the suspension state under the low aeration quantity, and excellent fluidization character is maintained, so that the partial nitrification advantages are stably kept, the advantages are created for simultaneous nitrification and denitrification, and the aeration energy consumption and the carbon source material consumption in the denitrification phase are reduced.

Description

technical field [0001] The invention relates to a biofilm reactor, in particular to a reactor capable of realizing biofilm carrier suspension under low aeration. Background technique [0002] Refining catalyst production wastewater has complex water quality, high concentrations of suspended solids and ammonia nitrogen, and contains a large amount of inorganic salts and chloride ions. The B / C value is low, and it is difficult to achieve biological treatment. The traditional biological treatment method is currently the most widely used denitrification technology, but the traditional biological treatment technology has the following problems: the process is long and occupies a large area, and the investment cost of infrastructure is high; the system has weak impact resistance and high concentration Ammonia nitrogen wastewater can inhibit the growth of nitrifying bacteria; the acidity generated during the nitrification process needs to be neutralized by adding alkali, which not ...

AI Technical Summary

Problems solved by technology

[0002] Refining catalyst production wastewater has complex water quality, high concentrations of suspended solids and ammonia nitrogen, and contains a large amount of inorganic salts and chloride ions, etc., and the B / C value is low, making it difficult to achieve biological treatment

The traditional biological treatment method is currently the most widely used denitrification technology, but the traditional biological treatment technology has the following problems: the process is long and occupies a large area, and the investment cost of infrastructure is high; the system has weak impact resistance and high concentration Ammonia nitrogen wastewater can inhibit the growth of nitrifying bacteria; the acidity generated during the nitrification process needs to be neutralized by adding alkali, which not only increases the treatment cost, but also may cause secondary pollution; the growth of nitrifying bacteria is slow, once the sludge is lost in the suspended sludge system , it is difficult to restore production in a short time; biofilm carrier (biological filler) is difficult to achieve fluidization under low aeration, easy to accumulate, and poor reaction effect

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