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Whole-process autotrophic nitrogen removal method and device

A technology for full autotrophic denitrification and nitrous nitrogen, which is applied in the field of new start-up autotrophic denitrification and full autotrophic denitrification devices. Nitrogen efficiency and other issues, to achieve the effect of increasing the collision probability, saving investment and energy consumption, and improving the denitrification efficiency

Inactive Publication Date: 2015-04-08
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Application Information

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Problems solved by technology

The first method will lead to a rapid decline in the activity of anammox sludge; the second method will make the incomplete contact between anammox granular sludge and wastewater, thereby reducing the nitrogen removal efficiency of the system

Method used

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  • Whole-process autotrophic nitrogen removal method and device

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Experimental program
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Effect test

Embodiment

[0049] 1) The effective volume of the reactor is 5L, and 8g / L of anammox sludge is inoculated into the reactor;

[0050] 2) Configure artificial nitrogen-containing wastewater, the wastewater composition is: NH 4 -N100mg / L, NO 2 -N100mg / L, KHCO 3 1.5-2.0g / L, NaCl10g / L, KH 2 PO 4 54mg / L, FeSO 4 ·7H 2 O9mg / L, EDTA5mg / L, trace element 1mL / L (CuSO 4 ·5H 2 O0.25mg / L, ZnSO 4 ·7H 2 O0.43mg / L, CoCl 2 ·6H 2 O0.24mg / L, MnCl 2 4H 2 O0.99mg / L, NaMoO 4 2H 2 O0.22mg / L, NiCl 2 ·6H 2 O0.19mg / L, NaSeO 4 0.11mg / L,H 3 BO 3 0.014mg / L), adjust the pH to 7-8 by 1mol / L HCl;

[0051] 3) Nitrogen is used to aerate the water inlet barrel so that the DO concentration in the water inlet barrel is about 0mg / L; the experimental wastewater enters the reactor under the action of the peristaltic pump, the hydraulic retention time (HRT) is about 5h, and the stirring rate of the stirring paddle About 30 rpm, at this time the water load is about 0.96kg-N / m 3 / day; the stirring speed of the ...

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Abstract

The invention discloses a whole-process autotrophic nitrogen removal method. The method mainly comprises the following steps: 1) inoculating anammox sludge into a reactor; 2) introducing nitrogen into the wastewater so as to reduce the DO (Dissolved Oxygen) concentration of wastewater to 0mg / L (milligram per liter) by filling nitrogen into the wastewater, and regulating the pH value of a water inflow barrel to reach 7 to 8; 3) gradually increasing the water inflow load by increasing the total nitrogen concentration of the wastewater and reducing the hydraulic retention time; 4) gradually increasing the DO concentration in the wastewater after a reaction is stable, thereby culturing bacteria capable of consuming oxygen in the reactor; 5) forming the oxygen-containing bacteria on the outer layer of the anammox sludge after performing the culturing acclimatization for half a month; 6) inoculating nitrosobacteria into the reactor and properly lowering the nitrate nitrogen concentration in the inflowing water while performing aeration to the reactor and controlling aeration quantity at the same time, thereby partially converting ammonia nitrogen entering the reactor into the nitrate nitrogen, i.e., the concentration (mg / L) ratio of the ammonia nitrogen to the nitrate nitrogen is 1:1 or so; regulating the pH value in the reactor to reach 7.5 to 7.7 by using a pH controller; 7) gradually increasing the water inflow load, thereby removing the nitrogen stably. The invention further discloses a device for realizing the whole-process autotrophic nitrogen removal method.

Description

technical field [0001] The invention relates to a whole-process autotrophic denitrification process, and more particularly relates to a novel start-up method for full-process autotrophic denitrification. [0002] The present invention also relates to a whole-process autotrophic denitrification device for realizing the above method. Background technique [0003] my country is a country with extremely poor water resources. In recent years, with the rapid development of China's economy, the discharge of nitrogen-containing wastewater has increased, and the nitrogen cycle has been destroyed, resulting in the accumulation of intermediate products, causing many water sources to be polluted by nitrogen, causing The deterioration of the water environment has adverse effects on humans and the environment. Among them, the nitrogen pollution of the water body will lead to the excessive reproduction of algae, which will lead to the eutrophication of the water body. The eutrophication o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 张莉杨嘉春王圣瑞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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