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Starting method for rapid and efficient short-cut nitrification

A short-range nitrification and high-efficiency technology, applied in the field of sewage treatment, can solve the problems of slow proliferation efficiency of ammonia oxidizing bacteria, long start-up period of short-range nitrification, low nitrite accumulation efficiency, etc. effect of growth

Active Publication Date: 2014-11-05
GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above-mentioned existing problems, the present invention adopts a sequenced batch (SBR) bioreactor, adopts an intermittent aeration method, and combines specific temperature, dissolved oxygen, and pH to solve the current short-range nitrification process (especially low-ammonia nitrogen domestic sewage There are problems such as slow proliferation efficiency of ammonia oxidizing bacteria (AOB), low nitrite accumulation efficiency, and long start-up period of short-cut nitrification.

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  • Starting method for rapid and efficient short-cut nitrification
  • Starting method for rapid and efficient short-cut nitrification
  • Starting method for rapid and efficient short-cut nitrification

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Embodiment 1

[0050] 1. The start of fast and efficient short-range nitrification includes the following steps:

[0051] 1) Introduce the inoculation sludge rich in nitrifying bacteria into the SBR reactor, the inoculation sludge is the return sludge of the secondary sedimentation tank of the municipal sewage plant; the concentration of the inoculation sludge MLSS is 4800mg / L; the reactor adopts intermittent operation mode;

[0052] 2) Inlet water: import the sewage to be treated into the SBR reactor, make the concentration of inoculated sludge MLSS in the previous step 3000mg / L, control the temperature of the sewage to 30±1°C, pH 8, and the chemical oxygen demand of the sewage to be treated COD is 170mg / L, ammonia nitrogen concentration is 50mg / L;

[0053] 3) Aeration: Start the aeration facility in the reactor to make the reactor an aerobic environment, in which the dissolved oxygen DO concentration is 1mg / L; the aeration time is 2h;

[0054] 4) Turn off the aeration facility and turn on...

Embodiment 2

[0067] The start of fast and efficient short-cut nitrification includes the following steps:

[0068] 1) Introduce the inoculation sludge rich in nitrifying bacteria into the SBR reactor, the inoculation sludge is the return sludge of the secondary sedimentation tank of the municipal sewage plant; the concentration of the inoculation sludge MLSS is 4800mg / L; the reactor adopts intermittent operation mode;

[0069] 2) Influent water: import the sewage to be treated into the SBR reactor, so that the inoculation sludge concentration MLSS in the previous step is 3000mg / L, control the temperature of the sewage to be 30°C, pH 8.0, and the chemical oxygen demand COD of the sewage to be treated is 150mg / L, ammonia nitrogen concentration is 40mg / L;

[0070] 3) Aeration: Start the aeration facility in the reactor to make the reactor an aerobic environment, in which the dissolved oxygen DO concentration is 1mg / L; the aeration time is 2h;

[0071] 4) Turn off the aeration facility and tu...

Embodiment 3

[0076] The start of fast and efficient short-cut nitrification includes the following steps:

[0077] 1) Introduce the inoculation sludge rich in nitrifying bacteria into the SBR reactor, the inoculation sludge is the return sludge of the secondary sedimentation tank of the urban sewage plant; the concentration of the inoculation sludge MLSS is 5000mg / L; the reactor adopts intermittent operation mode;

[0078] 2) Influent water: import the sewage to be treated into the SBR reactor, so that the inoculation sludge concentration MLSS in the previous step is 3500mg / L, control the temperature of the sewage to be 29°C, pH 7.9, and the chemical oxygen demand COD of the sewage to be treated is 200mg / L, ammonia nitrogen concentration is 60mg / L;

[0079] 3) Aeration: Start the aeration facility in the reactor to make the reactor an aerobic environment, in which the dissolved oxygen DO concentration is 1.2mg / L; the aeration time is 2.5h;

[0080] 4) Turn off the aeration facility and tu...

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Abstract

The invention discloses a starting method for rapid and efficient short-cut nitrification. The method comprises the following steps: guiding inoculated sludge which is rich in nitrobacteria into an SBR (Sequencing Batch Reactor) reactor; guiding sewage into the SBR reactor in order that the concentration of the sludge in the reactor becomes 2,500-3,500mg / L, and controlling the temperature of the sewage at 30+ / -1 DEG C and the pH of the sewage at 7.9-8.2; starting an aeration facility in the reactor in order that the concentration of dissolved oxygen becomes 0.8-1.2mg / L; performing aeration for 1.5-2.5 hours; stopping aeration, and starting to stir for 0.5-1.5 hours to uniformly mix the sludge and the sewage; repeatedly aerating and stirring operation for 1-5 times; standing the mixture for separating a solid from a liquid; and draining supernatant. By performing the short-cut nitrification in an intermittent aeration way, the growth of AOB (Ammonia Oxidizing Bacteria) can be better facilitated, a nitrification reaction is restrained, the energy consumption of a reaction device can be lowered effectively, and the starting of the short-cut nitrification of domestic sewage with low ammonia nitrogen content can be realized in comparison to the conventional continuous aeration.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a fast and efficient start-up method for short-range nitrification, in particular to a process and method for realizing short-range nitrification and accumulation of nitrite under low ammonia nitrogen conditions. Background technique [0002] Currently, conventional biological nitrification / denitrification is still the main method for denitrification of sewage. Although it has cost advantages compared with physical and chemical denitrification methods, it still has disadvantages such as low efficiency, high energy and material consumption, and large amount of residual sludge. With the in-depth understanding of nitrogen conversion pathways, a series of new nitrogen removal processes have been developed to address the inherent shortcomings of traditional nitrogen removal processes. Such as anaerobic ammonia oxidation process, short-cut nitrification and denitrification process, etc. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 隋军李捷徐浩党维
Owner GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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