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Wastewater treatment process and wastewater treatment system

A sewage treatment and process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, biological sludge treatment, etc., can solve problems such as low efficiency, increased sewage treatment costs, and lack of carbon sources

Inactive Publication Date: 2015-09-09
王洪臣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Wastewater treatment process and wastewater treatment system
  • Wastewater treatment process and wastewater treatment system
  • Wastewater treatment process and wastewater treatment system

Examples

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Effect test

Embodiment 1

[0083] 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:

[0084] Step 1: Sewage is pretreated through grid grit settling to remove grid slag and sand with larger particle size;

[0085] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of the anaerobic tank and the aerobic tank in the anaerobic-aerobic unit is 1:4;

[0086] In the anaerobic-aerobic unit, the sludge age is 3 days, and the hydraulic retention time is 1.5 hours;

[0087] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anoxic tank in the anoxic-aerobic unit, and the activated sludge after settling and concentrating partly flows back to In the anaerobic tank in the anaerobic-aerobic unit, the remaining sludge is discharged into the slu...

Embodiment 2

[0105] 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:

[0106] Step 1: Sewage is pretreated through grid grit settling to remove grid slag and sand with larger particle size;

[0107] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of the anaerobic tank and the aerobic tank in the anaerobic-aerobic unit is 1:5;

[0108] In the anaerobic-aerobic unit, the sludge age is 0.5d, and the hydraulic retention time is 0.5h;

[0109] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anoxic tank in the anoxic-aerobic unit, and the activated sludge after settling and concentrating partly flows back to In the anaerobic tank in the anaerobic-aerobic unit, the rest is discharged into the sludge hydrolysis dige...

Embodiment 3

[0128] 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:

[0129] Step 1: Sewage is pretreated through grid grit settling to remove grid slag and sand with larger particle size;

[0130] Step 2: The sewage after grid grit treatment enters the anaerobic-aerobic unit, and the volume ratio of the anaerobic tank and the aerobic tank in the anaerobic-aerobic unit is 1:3;

[0131] In the anaerobic-aerobic unit, the sludge age is 5 days, and the hydraulic retention time is 3 hours;

[0132] Step 3: The mixed solution in the anaerobic-aerobic unit enters the first sedimentation tank for mud-water separation, the supernatant enters the anoxic tank in the anoxic-aerobic unit, and the activated sludge after settling and concentrating partly flows back to In the anaerobic tank in the anaerobic-aerobic unit, the rest is discharged into the sludge hydrolysis...

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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 first 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 first muddy water mixed liquor to obtain first sludge and supernate; c, performing anaerobic and aerobic treatment on the supernate in sequence to obtain second muddy water mixed liquor; reacting the second muddy water mixed liquor and a coagulant, and performing sedimentation on obtained reaction liquid to obtain second sludge and effluent; enabling part of the first sludge to flow back and take part in anaerobic treatment; performing hydrolytic acidification on the other part of the first sludge to obtain fourth muddy water mixed liquor; conveying part of the fourth muddy water mixed liquor to take part in anaerobic treatment. The process is free of additional carbon sources, and has a higher nitrogen and phosphorus removal capacity; the system is small in occupied area; the energy self-sufficiency rate of a sewage treatment plant is greatly improved; the resource recovery rate is high; residual sludge output is lower.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a novel sewage treatment process and sewage treatment system for synchronous separation of carbon and phosphorus and efficient transformation of nitrogen into CP-N. 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. Acti...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/04
CPCY02E50/30
Inventor 王洪臣张源凯
Owner 王洪臣
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