Device and method for quickly starting and maintaining shortcut nitrification of municipal sewage based on p-chloro-m-xylenol

Abstract

The invention discloses a device and a method for quickly starting and maintaining short-cut nitrification of municipal sewage based on p-chloro-m-xylenol, and belongs to the field of biological sewage treatment. The device mainly comprises a municipal sewage raw water tank, a municipal sewage short-cut nitrification device, a p-chloro-m-xylenol sludge treatment device and a sludge reflux device,the method comprises the following steps: firstly, adding 60mg / L-70mg / L of the p-chloro-m-xylenol into a reactor in a first period; stirring for 15-20 hours to inhibit the activity of nitrifying bacteria, and then laterally treating part of activated sludge instead of adding an inhibitor into the reactor, so that on one hand, the activity of AOB is rapidly recovered, and on the other hand, the activity of NOB is continuously inhibited, and accumulation of nitrite and starting normal-temperature short-cut nitrification of municipal sewage can be realized. According to the method, the activity of the AOB can be recovered at the highest speed, the NOB can be elutriated step by step, and stable short-cut nitrification can be maintained.

Description

technical field [0001] The invention belongs to the field of sewage biological treatment, and relates to a device and method for rapidly starting and stably maintaining short-range nitrification of urban sewage at room temperature based on p-chloro-m-xylphenol, and is especially suitable for biological denitrification treatment of urban sewage with a low carbon-to-nitrogen ratio. Background technique [0002] With the development of the economy and the improvement of people's living standards, water environment problems, especially water eutrophication, have attracted more and more people's attention and discussion. Although the traditional activated sludge method is currently the main method for nitrogen and phosphorus removal in sewage treatment plants, it also faces problems such as insufficient carbon sources and high energy consumption. Therefore, it is imminent to explore efficient and energy-saving sewage treatment methods. [0003] In recent years, it has been contin...

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Problems solved by technology

Relevant literature reports that short-range nitrification can also be started by adding inhibitors such as sulfide, chlorate, and hydroxylamine, but usually after a period of operation, NOB will adapt to the inhibitor.

In addition, sulfide can easily lead to the production of hydrogen sulfide gas, which seriously pollutes the air and affects health

When the sulfide concentration in the sewage is too high, it may also cause the growth of filamentous sulfur bacteria, which will cause the activated sludge to expand, and the sedimentation performance will deteriorate, which will affect the quality of the effluent; Safety poses a great hidden danger. In addition, chlorate will destroy red blood cells, affect the function of blood to transport oxygen, and affect people's health; the economic cost of hydroxylamine is relatively high, and its properties are unstable. Irritating to respiratory system, skin, eyes and mucous membranes

In short, these inhibitors are not suitable for large-scale production

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