Pretreatment system and pretreatment method based on dissolved oxygen control in sewage treatment plant

A technology for sewage treatment plants and dissolved oxygen control, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as direct or indirect consumption of influent carbon sources , to achieve significant energy saving and consumption reduction effects, strong operability, and simple engineering design methods

Inactive Publication Date: 2015-03-25
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a sewage treatment plant pretreatment system and method based on dissolved oxygen control. By optimizing the water outlet mode of the lifting pump and the water outlet mode of the aeration grit chamber, the pretreatment unit is controlled Oxygenation of falling water to solve the common problem of direct or indirect consumption of some influent carbon sources caused by the oxygenation of falling water in pretreatment units in the actual production and operation of urban sewage treatment plants with high discharge standards

Method used

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  • Pretreatment system and pretreatment method based on dissolved oxygen control in sewage treatment plant

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment one: a kind of sewage treatment plant pretreatment method based on dissolved oxygen control, comprises the following steps:

[0038] a. The sewage treatment plant intake water 1 from the urban drainage pipe network enters the sump 4 below the intake pump house 3 after removing relatively large floating objects through the coarse grid 2 with a grid distance of 25mm in the sewage intake channel 14;

[0039] b. Under the action of the submersible lift pump 5, the sewage in the sump 4 enters the lift pump outlet channel 7 through the lift pump outlet pipe 6 in a submerged outflow manner;

[0040] c. The sewage in the outlet channel 7 of the lifting pump enters the front end of the inlet channel 8 of the aeration grit chamber through the pipeline by gravity flow, and removes fine particles through the fine grid 9 with an aperture of 3 mm in the inlet channel 8 of the aeration grit chamber Gravity enters the aeration grit chamber 10 after being wrapped with objects...

Embodiment 2

[0044] Embodiment two: a kind of sewage treatment plant pretreatment method based on dissolved oxygen control, comprises the following steps:

[0045] a. The sewage treatment plant intake water 1 from the urban drainage pipe network enters the sump 4 below the intake pump house 3 after removing relatively large floating objects through the coarse grid 2 with a grid distance of 20 mm in the sewage intake channel 14;

[0046] b. Under the action of the submersible lift pump 5, the sewage in the sump 4 enters the lift pump outlet channel 7 through the lift pump outlet pipe 6 in a submerged outflow manner;

[0047] c. The sewage in the outlet channel 7 of the lifting pump enters the front end of the inlet channel 8 of the aeration grit chamber through the pipeline by gravity flow, and removes fine particles through the fine grid 9 with an aperture of 2 mm in the inlet channel 8 of the aeration grit chamber Gravity enters the aeration grit chamber 10 after being wrapped with objects;...

Embodiment 3

[0051] Embodiment three: a kind of sewage treatment plant pretreatment method based on dissolved oxygen control, comprises the following steps:

[0052] a. The sewage treatment plant intake water 1 from the urban drainage pipe network enters the sump 4 below the intake pump house 3 after removing relatively large floating objects through the coarse grid 2 with a grid distance of 20 mm in the sewage intake channel 14;

[0053] b. Under the action of the submersible lift pump 5, the sewage in the sump 4 enters the lift pump outlet channel 7 through the lift pump outlet pipe 6 in a submerged outflow manner;

[0054] c. The sewage in the outlet channel 7 of the lifting pump enters the front end of the inlet channel 8 of the aeration grit chamber through the pipeline by gravity flow, and removes fine particles through the fine grid 9 with an aperture of 1mm in the inlet channel 8 of the aeration grit chamber Gravity enters the aeration grit chamber 10 after being wrapped with objec...

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Abstract

The invention relates to a pretreatment system and a pretreatment method based on dissolved oxygen control in a sewage treatment plant, belonging to the technical field of sewage treatment. The pretreatment system mainly comprises a sewage inlet canal, a water inlet pump room, a lifting pump water outlet canal, an aeration sand depositing pond water inlet canal, an aeration sand depositing pond and an aeration sand depositing canal water outlet canal. The pretreatment system is characterized in that a water collection pond is arranged below the water inlet pump room; the water collection pond is connected with the sewage inlet canal; a submerged lifting pump is arranged at the bottom of the water collection pond; the submerged lifting pump is connected with a lifting pump water outlet pipeline; the lifting pump water outlet pipeline is connected with the lifting pump water outlet canal; the lifting pump water outlet canal is connected with aeration sand depositing pond water inlet canal; the aeration sand depositing pond water inlet canal is connected with the aeration sand depositing pond; the aeration sand depositing pond is connected with the aeration sand depositing canal water outlet canal. The pretreatment system is mainly used for solving the problem of water dropping oxidation supply of the pretreatment unit of the sewage treatment plant by using a conventional engineering design method, and has the advantages that the carbon source retention property is good, the reinforced nitrogen and phosphorus removal potential is large, the production operation cost is low, the effects of energy conservation and consumption reduction are remarkable, the engineering design method is simple, and the like.

Description

technical field [0001] The invention relates to a sewage treatment plant pretreatment system and method based on dissolved oxygen control, belonging to the technical field of sewage treatment. Background technique [0002] Insufficient carbon source in influent water is the main limiting factor for the stable compliance of urban sewage treatment plants with high discharge standards and energy saving and consumption reduction. According to statistics, in 2008 my country's urban sewage treatment plants influent BOD 5 The average value of / TN is only 3.49, and the influent BOD5 / TN of 60% of urban sewage treatment plants is lower than 4. [0003] However, under the existing traditional engineering design methods, the actual problem of the direct or indirect consumption of part of the influent carbon source caused by the drop of water in the pretreatment unit and the oxygenation of the pretreatment unit in the operation of the sewage treatment plant with high discharge standards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02
CPCC02F9/00C02F1/001C02F1/24C02F1/52
Inventor 杨敏孙永利郑兴灿
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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