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Method for pre-treating low carbon-nitrogen ratio sewage by using primary settlement tank

A low carbon-to-nitrogen ratio, primary sedimentation tank technology, applied in the direction of flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve impact removal and organic carbon source shortage , Difficulty in adjusting the operation of the biochemical system, etc., to achieve the effect of reducing pressure, strengthening the function of biological denitrification, and increasing the number of denitrifying bacteria

Active Publication Date: 2010-12-08
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Summary
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AI Technical Summary

Problems solved by technology

While the primary sedimentation tank removes 40% to 76% of suspended solids, it also reduces BOD by 20% to 30%. 5 load, resulting in a deficit of organic carbon sources, affecting the removal of nitrogen and phosphorus by subsequent biological systems
However, due to poor urban drainage infrastructure and existing living habits in China, especially for those cities that are basically combined systems, the water quality of urban sewage fluctuates greatly throughout the year in spring, summer, autumn, and winter. The operation adjustment of the biochemical system brings many difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: When the carbon-nitrogen ratio of the raw water is not low, and the suspended solids are high, the primary sedimentation tank is operated in the following manner: the raw water first passes through ① the grit chamber, and the effluent from the grit chamber passes through the ② primary sedimentation tank, wherein the hydraulic capacity of the primary sedimentation tank The residence time can be selected between 1 and 2 hours depending on the condition of the raw water, and can be adjusted through the mud level; the effluent from the primary sedimentation tank enters the ③ biological (phosphorus removal) denitrification secondary treatment unit, and the effluent from the secondary treatment unit is directly discharged.

Embodiment 2

[0014] Embodiment 2: When the carbon-nitrogen ratio of the raw water is low and the suspended solids are high, the primary sedimentation tank is operated in the following manner: the raw water first passes through ① the grit chamber, and the outlet water of the grit chamber passes through ② the primary sedimentation tank, wherein the hydraulic retention time of the primary sedimentation tank It can be used between 0 and 1 hour depending on the raw water condition, and it can be adjusted through the mud level; the effluent from the primary sedimentation tank enters the ③biological (phosphorus removal) denitrification secondary treatment unit, and the effluent from the secondary treatment unit is directly discharged.

Embodiment 3

[0015] Embodiment 3: When the raw water carbon-nitrogen ratio is low and the primary settling tank cannot meet the carbon source demand under the short residence time, on the basis of the specific implementation mode 2, the sludge inoculation discharge is carried out again, that is, the activity of the upper part of the primary settling tank is relatively high. The high sludge is inoculated to the anoxic unit of the biological denitrification through the pipeline.

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Abstract

The invention discloses a method for pre-treating low carbon-nitrogen ratio sewage by using a primary settlement tank, and belongs to the field of control and treatment of water pollution. The technical scheme of the invention comprises the following steps of: (1) controlling water power residence time of the primary settlement tank to be flexible and adjustable within the range from 0 to 2 hours; (2) arranging sludge inoculation discharge ports at different sludge parts of the primary settlement tank to inoculate and discharge microorganisms of raw water at the upper part of a mud bucket to an anoxic tank; (3) arranging nitration liquid reflux inlets at the different sludge parts of the primary settlement tank to fully utilize the denitrification of the primary settlement tank; and (4) arranging outlet water reflux inlets of a secondary settlement tank at the different sludge parts of the primary settlement tank to fully utilize the denitrification of the primary settlement tank. Inorganic substances can be removed from the low carbon-nitrogen ratio sewage and organic substances and the microorganisms in the sewage can be kept simultaneously through the primary settlement tank, so that the method is favorable for subsequent biological phosphorus removal, nitrogen removal (AAO) or biological nitrogen removal (AO). The method is suitable for biological treatment of suspension and the sewage with larger change of carbon-nitrogen ratio and suitable for old plant transformation and new plant construction.

Description

Technical field: [0001] The invention belongs to a method for pretreating sewage with low carbon-to-nitrogen ratio, in particular to a method for pretreating sewage with low carbon-to-nitrogen ratio by using physical settlement and biological reaction in primary sedimentation tanks, which can remove inorganic substances and at the same time retain Organic matter and microorganisms are beneficial to subsequent biological phosphorus removal, denitrification (AAO) or biological denitrification (AO) treatment methods, and are suitable for biological treatment of suspended solids and sewage with large changes in carbon-nitrogen ratio. Background technique: [0002] my country's water pollution continues to intensify, and the phenomenon of eutrophication caused by the excessive accumulation of nitrogen and phosphorus in natural water bodies continues to break out. In order to solve the increasingly serious water pollution problem, my country began to implement the "Urban Sewage Tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52
Inventor 陈立郭兴芳陶润先
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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