Whole-process autotrophic nitrogen removal method and device

A technology of whole-process autotrophic denitrification and ammonia nitrogen, applied in the field of new start-up of whole-process autotrophic denitrification and whole-process autotrophic denitrification device, which can solve the problem of incomplete contact of anammox granular sludge, reduce system denitrification efficiency, and decrease anammox mud activity and other problems, to achieve the effect of saving investment and energy consumption, improving denitrification efficiency, and increasing the probability of collision

Inactive Publication Date: 2013-09-11
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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AI Technical Summary

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
Comparison scheme
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 composition of wastewater: 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 elements 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) Use nitrogen to aerate the inlet bucket to make the DO concentration in the inlet bucket about 0mg / L; the experimental wastewater enters the reactor under the action of the peristaltic pump, the hydraulic residence time (HRT) is about 5h, and the stirring rate of the stirring paddle About 30 rpm, at this time the water inlet load is about 0.96kg-N / m 3 / day; The stirring speed of the stirring paddle is controlled at abou...

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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 specifically to a novel start-up method for whole-process autotrophic denitrification. [0002] The invention also relates to a full-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 the Chinese economy, the discharge of nitrogen-containing wastewater has increased, and the nitrogen cycle has been destroyed, leading to the accumulation of intermediate products, causing many water sources to be polluted by nitrogen. The deterioration of the water environment has a negative impact on humans and the environment. Among them, the nitrogen pollution of the water body will lead to the excessive reproduction of algae, and then cause the eutrophication of the water body. The eutrophication of water bodies not only caused ...

Claims

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Application Information

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Patent Type & Authority Applications(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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