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A sewage treatment process

A sewage treatment and process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing sewage treatment costs, lack of carbon sources, low efficiency, etc.

Inactive Publication Date: 2017-08-29
上川(北京)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] my country's sewage water quality is special, the carbon source is relatively scarce, and the efficiency of the existing process technology for carbon source utilization is also low. Most of the carbon source is oxidized into carbon dioxide and synthetic microbial cells, so it cannot meet the requirements of simultaneous nitrogen and phosphorus removal. In order to meet the demand of water source, it is necessary to add carbon source to achieve the goal of effluent water quality, which greatly increases the cost of sewage treatment

Method used

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Effect test

Embodiment 1

[0084] Sewage is taken to the living area of ​​Renmin University of China, and the treatment water volume is designed to be Q=4m 3 / d, according to the following steps for sewage treatment:

[0085] Step 1: Sewage is preliminarily treated through grid grit settling to remove suspended solids with larger particle sizes, and the grid gap is 16-25mm;

[0086] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of anaerobic and aerobic units in the anaerobic-aerobic unit is 1:4; the sludge age in the anaerobic-aerobic unit The water retention time is 3d, and the hydraulic retention time is 1.5h; the dissolved oxygen in the anaerobic tank is controlled below 0.2mg / L, and the dissolved oxygen in the aerobic tank is controlled at about 2mg / L;

[0087] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anaerobic ammonium oxidation reactor, an...

Embodiment 2

[0101] Sewage is taken to the living area of ​​Renmin University of China, and the treatment water volume is designed to be Q=4m 3 / d, according to the following steps for sewage treatment:

[0102] Step 1: Sewage is preliminarily treated through grid grit settling to remove suspended solids with larger particle sizes, and the grid gap is 16-25mm;

[0103] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of anaerobic and aerobic units in the anaerobic-aerobic unit is 1:3; the sludge age in the anaerobic-aerobic unit is 0.5d, and the hydraulic retention time is 3h; the dissolved oxygen in the anaerobic tank is controlled below 0.2mg / L, and the dissolved oxygen in the aerobic tank is controlled at about 2mg / L;

[0104] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anaerobic ammonium oxidation reactor, and part of the activated s...

Embodiment 3

[0119] Sewage is taken to the living area of ​​Renmin University of China, and the treatment water volume is designed to be Q=4m 3 / d, according to the following steps for sewage treatment:

[0120] Step 1: Sewage is preliminarily treated through grid grit settling to remove suspended solids with larger particle sizes, and the grid gap is 16-25mm;

[0121] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of anaerobic and aerobic units in the anaerobic-aerobic unit is 1:5; the sludge age in the anaerobic-aerobic unit 5d, hydraulic retention time is 0.5h; the dissolved oxygen in the anaerobic tank is controlled below 0.2mg / L, and the dissolved oxygen in the aerobic tank is controlled at about 2mg / L;

[0122] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anaerobic ammonium oxidation reactor, and part of the activated sludge after...

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Abstract

The invention provides a wastewater treatment process and system. The process comprises the following steps: a, performing anaerobic and aerobic treatment on wastewater in sequence to obtain muddy water mixed liquor, wherein sludge age in the anaerobic and aerobic treatment is 0.5 to 5 days, and the waterpower stay duration is 0.5 to 3 h; b, performing sedimentation on the muddy water mixed liquor obtained in the step a, so as to obtain supernate and sludge; c, performing anaerobic ammonia oxidation on the supernate obtained in the step b, and separating obtained muddy water mixed liquor to obtain supernate and sludge; d, mixing the supernate obtained in the step c and a coagulant, and performing sedimentation on obtained reaction liquid to obtain sludge and effluent. The process is free of additional carbon sources, and has a higher nitrogen and phosphorus removal capacity. Test results show that after wastewater is treated by the process, SS is 5 to 10 mg / L, COD is 30 to 46 mg / L, TN is 9 to 13 mg / L, and TP is 0.3 to 0.5 mg / L.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a novel sewage treatment process and a sewage treatment system for synchronously separating nitrogen from carbon and phosphorus and transforming CP-N with high efficiency. Background technique [0002] Activated sludge method is the earliest and most widely used biological treatment technology. It started in 1914 and has been widely used in urban sewage treatment after more than 100 years of research and development. The activated sludge method is the main method of sewage biological treatment with activated sludge as the main body. The basic process of the activated sludge method includes: the sewage is subjected to primary sedimentation treatment, aeration treatment and secondary sedimentation treatment to obtain effluent and sludge, and part of the sludge is returned to participate in aeration treatment; the other part of the sludge is used as the remaining sludge drain system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 王洪臣张源凯
Owner 上川(北京)环境科技有限公司
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