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Device and method for quickly starting and maintaining short-cut nitrification of urban sewage based on p-chloro-m-xylenol

A technology of chloro-m-xylenol and xylenol, which is applied in the field of biological denitrification treatment of urban sewage with a low carbon-to-nitrogen ratio, and can solve problems such as hidden safety hazards, unstable properties, and hydrogen sulfide gas generation in sewage treatment plants. Achieve long-lasting and stable short-range nitrification at room temperature, convenient operation control, and easy operation

Active Publication Date: 2022-01-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Device and method for quickly starting and maintaining short-cut nitrification of urban sewage based on p-chloro-m-xylenol
  • Device and method for quickly starting and maintaining short-cut nitrification of urban sewage based on p-chloro-m-xylenol
  • Device and method for quickly starting and maintaining short-cut nitrification of urban sewage based on p-chloro-m-xylenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The normal-temperature short-range nitrification device for urban sewage adopted in the method is an SBR reactor made of plexiglass, with an effective volume of 9L and a drainage ratio of the reactor of 50%. An aeration device is installed at the bottom of the reactor, the air is compressed by the aeration pump, and the air is released by the microporous aeration head; the p-chloro-m-xylenol sludge treatment device is also an SBR reactor, made of plexiglass, with an effective volume of 5L Both of them are fed by peristaltic pumps, water is discharged by electric drain valves, and sludge is returned by return peristaltic pumps, which are automatically controlled by time-controlled timers.

[0028] The activated sludge inoculated in the reactor comes from the excess sludge in the secondary sedimentation tank of a municipal sewage treatment plant in Beijing. The retrieved excess sludge is inoculated into the reactor after being washed several times. After inoculation, the s...

Embodiment 2

[0036] The difference between this embodiment and Example 1 is: use p-chloro-m-xylenol to quickly start the short-cut nitrification process and strengthen the short-cut nitrification process through side-flow inhibitor sludge treatment, then stop the side-flow inhibitor treatment directly instead of gradually reducing processing frequency. Other steps and parameters are the same as Example 1.

[0037] The changes of three nitrogen parameters during short-cut nitrification start-up and stable operation are as follows: figure 2 shown. This embodiment is divided into three stages, stage I startup stage (once a day), stage II stable operation stage (once a day), stage III stop side stream treatment stage. Phase I start-up phase and phase II stable operation phase are similar to the situation in Example 1. First, p-chloro-m-xylenol is used to suppress the activity of activated sludge nitrifying bacteria. After about 15 days, the activity of AOB basically returns to normal levels...

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Abstract

The invention relates to a device and method for quickly starting and maintaining short-cut nitrification of urban sewage based on p-chloro-m-xylphenol, belonging to the field of sewage biological treatment. The device of the present invention is mainly composed of an urban sewage raw water tank, an urban sewage short-range nitrification device, a p-chloro-m-xylenol sludge treatment device and a sludge return device; 60mg / L~70mg / L p-chloro-m-xylenol, stirred for 15h~20h to inhibit the activity of nitrifying bacteria, and then no longer add inhibitors to the reactor, but treat part of the activated sludge side-stream, On the one hand, it quickly restores the activity of AOB, and on the other hand, it continuously inhibits the activity of NOB, so as to realize the accumulation of nitrite and start the short-term nitrification of urban sewage at room temperature. The invention can restore the activity of AOB at the fastest speed and gradually elutriate NOB, and can maintain stable short-range nitrification.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/34C02F101/36C02F101/34C02F101/16
CPCC02F3/1263C02F3/34C02F2203/006C02F2101/36C02F2101/345C02F2101/16C02F2101/163C02F2101/166C02F2301/046C02F2209/22C02F2209/08C02F2209/14C02F2209/15C02F2209/16C02F2303/14Y02W10/10
Inventor 高景峰张达贾京鑫崔影超张文治王知其
Owner BEIJING UNIV OF TECH
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