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Method and system for deeply removing total nitrogen in sewage

A sewage and deep technology, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of deep denitrification cumbersome process, difficult to transform, not easy to control, etc.

Active Publication Date: 2020-10-23
LVYUAN BEIJING ENVIRONMENTAL EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned prior art scheme has the following defects: in order to achieve deep denitrification in this process, firstly, the sewage needs to enter the SBR reactor for organic matter removal, and adopt an anaerobic / aerobic alternate operation process for treatment; then the SBR reactor for organic matter removal The effluent enters the short-cut nitrification / anammox granular sludge UASB reactor, and is treated by short-cut nitrification and anaerobic ammonium oxidation processes; finally, the effluent from the short-cut nitrification / anammox granular sludge UASB reactor enters short-cut denitrification / In the anaerobic ammonium oxidation UASB reactor, the process of short-range denitrification and anaerobic ammonium oxidation is used for treatment
In the existing technology, the way to achieve deep denitrification is relatively cumbersome and the process flow is relatively long, which is not easy to control, and it is not easy to modify in the limited space of the existing sewage treatment plant

Method used

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  • Method and system for deeply removing total nitrogen in sewage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Contains NO 3 - and NH 4 + The sewage comes in from the sewage water inlet pipe. At this time, put coagulant in the coagulation zone 11, and add 15 mg of coagulant for each L of water inflow, and react for 10 minutes. At this time, the sewage and the coagulant undergo adsorption reaction. The coagulant captures the activated sludge, forms a suspended sludge layer 131 in the sedimentation zone 13 (DO in the suspended sludge layer 1312 ), so that the concentration ratio of COD / nitrate nitrogen in the sewage entering the biologically active sand filter 2 is 1:2, the sewage stays in the biologically active sand filter 2 for 0.8h, and finally flows out from the clear water outlet pipe.

[0051] The water quality detection table in the embodiment 1 of table 1

[0052] water sample SS(mg / L) COD (mg / L) TN (mg / L) TP (mg / L) Water quality of sewage inlet pipe 40-50 60-75 20 1 Effluent water quality in sedimentation area / / 15 / Clear wa...

Embodiment 2

[0054] Contains NO 3 - and NH 4 + The sewage comes in from the sewage inlet pipe. At this time, put a coagulant in the coagulation zone 11, and add 10 mg of coagulant per L of water inflow, and react for 5 minutes, and then add flocculant in the flocculation zone 12, and the unit is per L Inlet water, add 3mg flocculant to react for 10min, at this time, sewage and coagulant and flocculant carry out adsorption reaction, coagulant and flocculant capture activated sludge, form suspended sludge layer 131 (suspended sludge) in sedimentation zone 13 DO2 ), so that the concentration ratio of COD / nitrate nitrogen in the sewage entering the biologically active sand filter 2 is 1.5:2, the sewage stays in the biologically active sand filter 2 for 1.5h, and finally flows out from the clear water outlet pipe.

[0055] The water quality detection table in the embodiment 2 of table 2

[0056] water sample SS(mg / L) COD (mg / L) TN (mg / L) TP (mg / L) Water quality of sew...

Embodiment 3

[0058] Contains NO 3 - and NH 4 + The sewage comes in from the sewage inlet pipe. At this time, put a coagulant in the coagulation zone 11, and add 12 mg of coagulant per L of water inflow, and react for 8 minutes, and then add flocculant in the flocculation zone 12, and the unit is per L Inlet, add 2mg flocculant to react for 5min, at this time, sewage and coagulant and flocculant carry out adsorption reaction, coagulant and flocculant capture activated sludge, form suspended sludge layer 131 (suspended sewage) in settling area 13 DO2 ), so that the concentration ratio of COD / nitrate nitrogen in the sewage entering the biologically active sand filter 2 is 1:2, the sewage stays in the biologically active sand filter 2 for 1 hour, and finally flows out from the clear water outlet pipe.

[0059] The water quality detection table in the embodiment 3 of table 3

[0060] water sample SS(mg / L) COD (mg / L) TN (mg / L) TP (mg / L) Water quality of sewage inlet pi...

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Abstract

The invention discloses a method and a system for deeply removing total nitrogen in sewage, and relates to the technical field of sewage treatment. The method comprises the following steps: adding a carbon source into sewage containing NO3 <-> and NH4 < + >, wherein the concentration ratio of COD to nitrate nitrogen in the sewage is (2.7-3.5): 1; enabling the sewage carrying the carbon source toenter a reactor with a suspended sludge layer, penetrate through the suspended sludge layer and enter an anaerobic environment containing anaerobic bacteria, wherein the concentration ratio of COD tonitrate nitrogen in the sewage is (1-1.5): 2; and finally discharging water. The method is good in deep decarburization effect, and the process for realizing deep denitrification is simple, easy to control and easy to transform. The system comprises the reactor with the suspended sludge layer and an anaerobic reaction unit, the reactor is communicated with the anaerobic reaction unit, the reactoris provided with a sewage inlet end for sewage to enter, and the anaerobic reaction unit is provided with a clear water outlet end; the system is simple in structure, easy to implement and suitable for upgrading and reconstructing an existing sewage treatment plant.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, more specifically, it relates to a method and system for deep removal of total nitrogen in sewage. Background technique [0002] The process of purifying sewage to meet the water quality requirements for discharge into a certain water body or reuse is called sewage treatment. At present, after urban sewage is treated, the content of pollutants in the effluent is often difficult to meet the first-level A discharge standard, especially the nitrogen and phosphorus indicators. After the secondary treatment of urban sewage, the ammonia nitrogen content is 0.5-7.5mg / L, and the nitrate nitrogen is 1.5- 20mg / L, nitrite nitrogen 0.005-0.02mg / L, although the content of each pollutant varies with the region, sewage type and treatment method, it is inevitable to exceed the discharge standard. If the sewage exceeding the standard is discharged directly, the excess nitrogen cannot be absorbed by the ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30C02F101/16
CPCC02F1/5245C02F1/56C02F3/28C02F3/34C02F2101/16C02F2101/163C02F2101/30C02F2209/16C02F2305/06
Inventor 方芳潘潇涵马晓力曹新鹏
Owner LVYUAN BEIJING ENVIRONMENTAL EQUIP
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