Denitrifying accelerator and application thereof

Abstract

The invention relates to a denitrifying accelerator and application thereof. The denitrifying accelerator comprises the following components in percentage by mass: 75%-80% of polyhydric alcohols, 0. 7%-2.25% of mineral elements, 0.5%-1.0% of organic acid, 1.0%-2.5% of biological enzyme, and the balance of water, wherein the molecular weight of polyhydric alcohols is less than or equal to 100. Thedenitrifying accelerator is used for wastewater treatment, can achieve relatively high denitrification efficiency with little amount, can promote microbial diversity, is nonpoisonous and harmless, canbe added directly and conveniently through a metering pump without special protective measures, and also is less prone to inflammation and explosion and requires no extra explosion protection zone for storing carbon sources so as to save construction investment; at the same time, the denitrifying promoter has liquid carbon source with low freezing point, and thus does not condense even when not stored indoors in winter.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a denitrification accelerator and its application. Background technique [0002] Excessive total nitrogen in wastewater has always been a chronic problem in the sewage treatment system. Wastewater containing excessive nitrogen compounds discharged into ditches and rivers will cause eutrophication of the water body and affect the balance of the ecological environment. Nowadays, biological nitrification and denitrification process has been widely used in denitrification treatment. However, sewage treatment plants generally have the problem of insufficient carbon sources for denitrification, and the lack of carbon sources has seriously restricted the efficiency of biological denitrification. [0003] Biological denitrification is under anaerobic conditions, using organic carbon sources as electron donors and nitrate nitrogen as electron acceptors to convert NO x -N conver...

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Problems solved by technology

[0005] 1. As an external carbon source, methanol itself is a flammable and explosive chemical, which has strict requirements on the dosing equipment and is very dangerous; and it is a little toxic when it is added to the wastewater treatment system, which greatly limits the Methanol is used in sewage plants

[0006] 2. In the process of biological denitrification, sodium acetate is a carbon source with high denitrification efficiency, but after use, sodium acetate will introduce inorganic salts, which will increase the salt content of wastewater; Dissolving, which will inevitably cause fouling of pipeline equipment, and has a strong odor, making it inconvenient to add

[0007] 3. Glucose is a green carbon source, but its effect on biological denitrification is unstable, the efficiency is low, and the dosage is large

[0008] 4. Starch is a high-molecular organic matter, and microorganisms need to go through a series of metabolic processes to use it for denitrification, and the denitrification efficiency is not high

Pump the solution from the reaction kettle to the storage tank and let it stand. The supernatant liquid is the prepared composite carbon source for denitrification. However, the introduction of sodium acetate will cause the above-mentioned defects, and ethanol has a low ignition point, which has certain insecurity

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