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Device and method for synergistic inhibition of nitrifying bacteria activity to achieve partial nitrification employing free ammonia and free nitrous acid

A technology of synergistic inhibition and short-range nitrification, applied in chemical instruments and methods, sustainable biological treatment, water/sludge/sewage treatment, etc., to improve treatment efficiency, optimize microbial populations, and reduce energy consumption for aeration

Inactive Publication Date: 2015-05-27
LANZHOU JIAOTONG UNIV
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  • Claims
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Problems solved by technology

[0009] The device and method for free ammonia and free nitrous acid synergistically inhibiting the activity of nitrifying bacteria to realize short-cut nitrification designed by the present invention are to solve the problems of rapid realization and stable maintenance of short-cut nitrification in high-ammonia nitrogen wastewater continuous flow process

Method used

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  • Device and method for synergistic inhibition of nitrifying bacteria activity to achieve partial nitrification employing free ammonia and free nitrous acid
  • Device and method for synergistic inhibition of nitrifying bacteria activity to achieve partial nitrification employing free ammonia and free nitrous acid
  • Device and method for synergistic inhibition of nitrifying bacteria activity to achieve partial nitrification employing free ammonia and free nitrous acid

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Embodiment 1

[0040] Examples see figure 1 : The landfill leachate to be treated enters the aerobic nitrification tank 4 from the raw water tank 1 by the water inlet pump 2 via the water inlet pipe 3 . At the same time, the blower 7 provides oxygen to the aerobic nitrification tank 4 through the aeration pipe 8, and the oxygen enters the muddy water mixture through the air expander 9. The mud-water mixture in the aerobic nitrification tank 4 flows into the sedimentation tank 13 through the outlet pipe 12 of the nitrification tank by gravity. The precipitated supernatant is discharged through the outlet pipe 14 of the sedimentation tank, part of the precipitated sludge is returned to the aerobic nitrification tank 4 through the sludge return pipe 10 under the action of the sludge return pump 11, and the other part of the sludge is discharged through the remaining sludge. The mud pipe 15 is discharged. During the whole reaction process, the pH sensor 6 is used to monitor the pH value in the...

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Abstract

The invention discloses a device and a method for synergistic inhibition of nitrifying bacteria activity to achieve partial nitrification employing free ammonia and free nitrous acid, and belongs to the field of biological nitrification of continuous flow process wastewater. The device mainly comprises a raw water tank, an intake pump, an intake pipe, an aerobic nitrification pond, a pH determinator, a pH sensor, a blast blower, an aerator tube, an air diffuser, a sludge reflux pipe, a sludge reflux pump, an aerobic nitrification pond drain pipe, a settling pond, a settling pond drain pipe, and a residue sludge discharge pipe. On the basis of the synergistic inhibition mechanism of the free ammonia (FA) and free nitrous acid (FNA) on activity of nitrite-oxidizing bacteria, rapid start and stable maintaining of partial nitrification at normal temperature are achieved by controlling the FA concentration inside the aerobic nitrification pond at 5.9-63.1mg / L, the problem of a bottleneck of partial nitrification of the continuous process is solved, and the device has the characteristics of being high in nitrification efficiency, rapid in reaction rate, and the like, the operation cost is saved, and excellent water is obtained.

Description

technical field [0001] The invention relates to a device and a method for synergistically inhibiting the activity of nitrifying bacteria by free ammonia and free nitrous acid to realize short-range nitrification, and belongs to the field of biological denitrification of sewage in a continuous flow process. Background technique [0002] In 1975, Voets et al. discovered the accumulation of nitrite nitrogen during the nitrification process in the study of treating high-concentration ammonia nitrogen wastewater, and first proposed the concept of short-range nitrification and denitrification biological nitrogen removal. The basic principle is to convert ammonia nitrogen (NH 4 + -N) Oxidation is controlled in the nitrification stage, and then nitrite nitrogen (NO 2 - -N) reduced to nitrogen. Based on the microbial conversion process of nitrogen, short-cut nitrification is a two-type reaction completed by two independent bacteria, ammonia oxidizing bacteria (AOB) and nitrite ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02C02F3/34
CPCY02W10/10
Inventor 孙洪伟
Owner LANZHOU JIAOTONG UNIV
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