Method for rapidly starting and stably maintaining normal-temperature short-cut nitrification of municipal sewage by using phenacetin

Abstract

The invention discloses a method for rapidly starting and stably maintaining normal-temperature short-cut nitrification of municipal sewage by using phenacetin, and belongs to the technical field of biological sewage treatment. The method comprises the following steps: inoculating the whole-process nitrification activated sludge into a sequencing batch biochemical reactor, and soaking the activated sludge in the reactor with phenacetin with the concentration of 4-20 mg / L for 12-30 hours. The whole-process nitrification activated sludge is soaked in phenacetin, the ammonia oxidation activity of the reactor can be quickly recovered, the nitrite oxidation activity can be continuously inhibited, and when the ammonia nitrogen degradation rate (ARE) reaches 90% or above and the nitrite accumulation rate (NAR) reaches 80% or above, normal-temperature short-cut nitrification of the municipal sewage is formally started.

Description

technical field [0001] The invention belongs to the field of sewage biological treatment, and relates to a method for quickly starting and stably maintaining urban sewage normal-temperature short-range nitrification by using phenacetin. The invention is especially suitable for biological denitrification treatment of urban sewage with low carbon-to-nitrogen ratio. Background technique [0002] With the gradual improvement of our country's economy, culture and people's living standards, and the rapid development of industry and agriculture, human activities will inevitably discharge a large amount of waste pollutants into the environment. Among them, the eutrophication of the water environment caused by the discharge of nitrogen-containing pollutants is particularly serious. The most commonly used method for denitrification of sewage is biological denitrification, and the most economical and effective biological treatment process for biological denitrification is short-range n...

AI Technical Summary

Problems solved by technology

Ma et al. successfully initiated short-cut nitrification using 0.75mg / LFNA, but only maintained it for 5 days, and found that the abundance of Ca.Nitrotoga in the reactor gradually increased, resulting in the instability of short-cut nitrification

The above studies indicate that NOB may adapt to FA and FNA, which may lead to the destabilization of short-range nitrification.

In addition, there are studies to achieve short-range nitrification by adding hydroxylamine, sulfide, chlorate and formic acid, but the chemical properties of hydroxylamine are unstable, easy to decompose, and the chemical cost is high; sulfide can easily cause excessive growth of sulfur filamentous bacteria and cause pollution Occurrence of mud swelling; after stopping adding potassium chlorate, short-term nitrification is prone to instability, and chlorate is an explosive chemical, which is not conducive to large-scale storage; formic acid is corrosive to a certain extent, which is also not conducive to storage

In summary, these inhibitors have disadvantages such as not easy to store, NOB is prone to adaptability, and expensive

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