Method for biologically purifying municipal sewage and recovering resources

A technology for biological purification and resource recovery, applied in chemical instruments and methods, biological sludge treatment, multi-stage water/sewage treatment, etc.

Active Publication Date: 2010-11-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low concentration of these substances in sewage and it is difficult to separate them from sewage, coupled with the large volume of sewage, it is difficult to directly utilize these substances in urban sewage. At present, they can only be oxidized, decomposed or removed. To achieve the purpose of purifying sewage, and at the same time of purifying sewage, it also produces solid waste-surplus sludge

Method used

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  • Method for biologically purifying municipal sewage and recovering resources
  • Method for biologically purifying municipal sewage and recovering resources

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Experimental program
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Effect test

Embodiment 1

[0025] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes to keep D0 at 2mg / L to activate the sludge;

[0026] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:3, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 1mg / L;

[0027] 3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 1.5 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10- 20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...

Embodiment 2

[0034] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes, keeping D0 at 4mg / L, and activate the sludge;

[0035] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:1, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 2mg / L;

[0036]3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 2 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10-20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...

Embodiment 3

[0043] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes to keep D0 at 3mg / L to activate the sludge;

[0044] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:2, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 1.5mg / L;

[0045] 3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 2 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10-20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...

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Abstract

The invention discloses a method for biologically purifying municipal sewage and recovering useful resources. The method comprises the following steps of: 1) discharging excess sludge into a sludge activation tank to perform aerobic aeration; 2) discharging the activated sludge and the raw sewage into a sludge adsorption tank to perform aerobic aeration; 3) precipitating sludge-water mixed solution in a precipitation tank, putting supernatant into a sewage treatment system, purifying the supernatant, then discharging the sewage, and purifying the excess sludge circularly; 4) mixing the sludge at the bottom of the precipitation tank with the sludge in an anaerobic digestion tank to perform anaerobic fermentation; 5) converting an organic substance after the anaerobic fermentation into methane gas and recovering the methane gas; 6) discharging the supernatant into a crystallizing pond, adding a magnesium salt into the crystallizing pond, adjusting the pH value to ensure that the mixture is turned into guanite deposit, and recovering the guanite deposit; 7) putting the supernatant in the crystallizing pond into the sewage treatment system; and 8) discharging the excess sludge after the anaerobic fermentation. By using the excess sludge to treat the municipal sewage, the method not only solves the problems in sewage purification, makes use of pollutants in the sewage, but also realizes sludge disposal and extracts effective resources in the sewage.

Description

Technical field [0001] The invention belongs to a method for biological purification of sewage and waste water, in particular to a method for biological purification of urban sewage and recovery of useful resources. Background technique [0002] There are two main types of sewage purification treatment: separation method and transformation method. Since most of the pollutants in urban sewage are dissolved and colloidal organic and inorganic substances such as nitrogen and phosphorus, the direct separation method requires high technical requirements and high treatment costs. At present, the direct separation method is difficult to be widely used in the purification of urban sewage. The purification treatment of urban sewage basically adopts biotransformation or biotransformation-separation method. These methods are based on the artificial enhancement of microbial transformation based on the natural purification mechanism of rivers and soil, and use microbial metabolism to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B25/45C02F11/04
CPCY02E50/343Y02E50/30
Inventor 袁林江
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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