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Method and device of nitrifying domestic wastewater by embedded nitrobacteria

A technology for embedding nitrifying bacteria and domestic sewage, which is applied in the field of water treatment reactors, can solve problems such as difficulty in prolonging the residence time of nitrifying bacteria, inability to effectively remove ammonia nitrogen, and slow proliferation of nitrosifying bacteria, so as to improve treatment efficiency, The effect of simple operation and small size of the device

Active Publication Date: 2014-06-25
BEIJING UNIV OF TECH
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Problems solved by technology

The proliferation speed of nitrifying bacteria and nitrosifying bacteria is slow, and the biological residence time of traditional nitrification tanks often has not reached the generation time of nitrifying bacteria and nitrosifying bacteria. In this way, the concentration of nitrifying bacteria and nitrosifying bacteria is often at a very low level. Therefore, Nitrification efficiency is very low
The ammonia nitrogen treatment process in the traditional sewage generally increases the number of nitrifying bacteria in the sludge by increasing the sludge age, but the hydraulic retention time limits the sludge age, and it is difficult to prolong the residence time of the nitrifying bacteria in the system, and the ammonia nitrogen cannot be effectively removed. efficiency is also very low

Method used

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  • Method and device of nitrifying domestic wastewater by embedded nitrobacteria

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Embodiment 1

[0030] Embodiment 1, a kind of reactor that utilizes embedded nitrifying bacteria to carry out nitrification treatment to domestic sewage, see figure 1 , the bottom of the closed nitrification tank reactor is provided with an aeration tray 9, the water inlet pipe 1 is arranged at the bottom of the inner layer of the reactor, the outlet pipe 2 is arranged at the middle of the cylindrical reaction tank, the water bath inlet pipe 3 is arranged at the bottom of the outer layer of the reactor, and the water bath The return pipe 4 is set outside the outer layer of the reactor, located at a cross-section at the highest point of the water bath area 5, and returns to the water bath constant temperature barrel 6, the heat preservation cover 7 is located on the outermost layer of the reactor, and the stirring system is located directly above the cylindrical reactor , stirred at 1 / 3 of the water depth by the spiral stirring paddle 8, the embedded nitrifying bacteria 13 were suspended in th...

Embodiment 2

[0031] Embodiment 2, using the reaction device of Embodiment 1 and using WPU as a carrier to embed nitrifying bacteria to realize the operation method of influent nitrification, includes the following steps.

[0032] (1) Separation and selection of nitrifying bacteria

[0033] The activated sludge from the secondary settling tank of the sewage treatment plant is used, and a part is selected to be cultivated in the laboratory to further increase its concentration and purity and prepare for the follow-up experiment.

[0034] First filter the collected activated sludge from the secondary sedimentation tank of the sewage treatment plant with a 30-mesh nylon fine mesh to remove larger impurity particles, and then centrifuge and wash it with 0.9% normal saline for 2-3 times (4000r / min, 15min each time) ), the enriched activated sludge was domesticated and cultivated with simulated ammonia nitrogen wastewater prepared in the laboratory, and the wastewater composition was NH 4 CI, 15...

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Abstract

The invention relates to a method and a device of nitrifying domestic wastewater by embedded nitrobacteria, and belongs to the field of sewage treatment. The method comprises the following steps: separating and enriching separated nitrobacteria and embedding by a WPU material; placing the embedded nitrobacteria in a special nitrifying reactor device which comprises a water bath constant temperature system, aerating equipment, stirring equipment, a nitration reaction tank and the like. Due to the embedded nitrobacteria, the hydraulic retention time and the biological retention time are separated, and infinitely long biological retention time is realized, so that the biomass of nitrobacteria in the reactor is greatly increased, and the wastewater treatment efficiency is improved. Meanwhile, the reactor has the advantages of high impact load, easiness in recovery start and no mud discharged, and the dosage of the embedded nitrobacteria carriers can be agilely adjusted according to the water quality of the source of water.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a water treatment reactor and an operation method using embedded nitrifying bacteria as a carrier. Background technique [0002] Entering the 21st century, the global water resources crisis has brought great troubles to human society. As a developing country, my country's water pollution control has become one of the main goals of my country's strengthening of water resources protection. The 2009 "China Environmental Status Bulletin" pointed out that China Surface water pollution is relatively heavy, the seven major water systems are generally slightly polluted, and problems such as eutrophication of lakes are prominent. The accumulation of various forms of nitrogen such as nitrate nitrogen produced by a large amount of chemical fertilizers and ammonia nitrogen in concentrated urban domestic sewage has intensified the degree of eutrophication of lake water, affecting and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/34
CPCY02W10/10
Inventor 李军邓海亮陈光辉张彦灼岳耀冬王盟
Owner BEIJING UNIV OF TECH
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