A nitrification and denitrification two-phase expanded bed reactor and sewage treatment process

Abstract

The invention provides a nitrification and denitrification two-phase expanded bed reactor and a sewage treatment process. The expanded bed reactor includes a reactor, an oxygen dissolving device, a circulating pump and ancillary pipelines; the reactor is a vertical cylindrical structure, and from bottom to top it is divided into bottom water distribution area, aerobic reaction area, secondary water distribution area, anoxic The reaction zone and the water outlet area; the aerobic reaction zone and the anoxic reaction zone are filled with small particle size fillers, the secondary water distribution area is equipped with a contraction-expansion rectification ring, and the water outlet area is equipped with a three-phase separator. Using the above-mentioned expanded bed reactor, nitrification and denitrification are carried out in one reactor, and the biochemical and oxygen-dissolving processes are completed independently. The load of biochemical treatment is high, the equipment occupies a small area, and investment and operating costs are saved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and more specifically relates to a nitrification and denitrification two-phase expanded bed reactor for advanced treatment of sewage and a sewage treatment process. Background technique [0002] Nitrification and denitrification is the most commonly used biochemical process for sewage denitrification treatment. Nitrification is to oxidize ammonia nitrogen in sewage to nitrate through microbial aerobic biochemical reaction, and denitrification is to reduce nitrate to nitrogen through microbial anoxic biochemical reaction. [0003] Commonly used sewage denitrification can be divided into two types: pre-denitrification and post-denitrification. Pre-denitrification requires a large amount of mixed liquid reflux, and the denitrification efficiency is limited. After the nitrification unit, facilities for further removal of organic matter are installed. Both of these two denitrification proces...

AI Technical Summary

Problems solved by technology

But this three-phase fluidized bed still has certain deficiencies: (1) The internal circulation flow depends on the air supply volume, and the dissolved oxygen volume also depends on the air supply volume. In order to realize the fluidization of the packing, the air supply volume must be large enough, and the reactor Dissolved oxygen is usually difficult to control at a lower concentration required for denitrification; (2) The driving energy source of the internal cycle is the work of gas expansion during the rising process, and the energy utilization rate is low, resulting in high operating costs

Images