Nitrosation SBR device for promoting short-cut nitrification by adding hydrazine and improved process

Abstract

The invention relates to a nitrosation SBR device for promoting short-cut nitrification by adding hydrazine and an improved process, a traditional SBR process is adopted, the characteristic that ammonia oxidizing bacteria and nitrite oxidizing bacteria have different affinity to DO is utilized, a low-oxygen operation strategy is adopted, and the selective inhibition effect of a hydrazine inhibitor on the two types of bacteria is combined, so that ammonia oxidizing bacteria are enriched, nitrite oxidizing bacteria are elutriated, a nitrosation process is started, the ammonia oxidation rate, the nitrite accumulation rate, the sludge concentration and the like are used as inspection indexes, and the short-cut nitrification promoting capacity of a hydrazine adding improvement process and the short-cut nitrification promoting capacity of a traditional potassium chlorate process are compared. Through adjustment, transformation from complete nitrosation to semi-nitrosation is realized, the ratio of NO <2->-N to NH4 < + >-N in effluent is 1.07, and the water inlet requirement of an anaerobic ammonia oxidation process is met. The method is convenient for batch production, high in purification efficiency, natural and pollution-free in inhibitor source, stable in performance and easy to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of a nitrosation SBR reactor for promoting short-range nitrification, in particular to a nitrosation SBR device and an improved process for promoting short-range nitrification by adding hydrazine. Background technique [0002] With the growth of population and the continuous development of industry and agriculture, excessive nitrogen is discharged into water bodies, causing environmental pollution to become increasingly serious. Excessive nitrogen in water can easily lead to excessive growth of algae, resulting in water eutrophication, red tide and other phenomena, poisoning aquatic organisms, and some nitrogen compounds have carcinogenic, teratogenic and mutagenic effects, which seriously threaten human health. The nitrosation process is the core technology of the new biological denitrification process, but there are still some shortcomings in the process. The start-up of the nitrosation process needs to co...

AI Technical Summary

Problems solved by technology

Excessive nitrogen in water can easily lead to excessive growth of algae, resulting in water eutrophication, red tide and other phenomena, poisoning aquatic organisms, some nitrogen compounds have carcinogenic, teratogenic and mutagenic effects, which seriously threaten human health

The nitrosation process is the core technology of the new biological denitrification process, but there are still some shortcomings in the process. The start-up of the nitrosation process needs to control multiple operating parameters at the same time, which increases the difficulty of process control and the elutriation time of nitrite oxidizing bacteria. long, easy to re-proliferate and make the nitrosation system unstable or even collapsed; therefore, from the perspective of economy, simplicity and ease of operation, the method of adding inhibitors is used to make use of its differential inhibition of ammonia oxidizing bacteria and nitrite oxidizing bacteria characteristics, inhibit the activity of nitrite oxidizing bacteria and even completely wash them out of the system

At present, potassium chlorate is generally used as an inhibitor in traditional processes, but the decomposed products of potassium chlorate are chlorite or chloride ions, which cannot be biodegraded and may remain in the effluent, which will affect the subsequent combined process

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