Method for extracting activated sludge extracellular polymer, and adsorption application of activated sludge extracellular polymer in uranium polluted water/soil

An extracellular polymer and activated sludge technology, which is applied in the field of purification and treatment, can solve the problems of limited application of heavy metal polluted water bodies, complicated EPS extraction methods, etc. Effect

Inactive Publication Date: 2019-06-25
WUHAN UNIV OF TECH
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent with application number 201610955395.X uses ultrasonic / heating / centrifugation to extract EPS produced by cultured bacteria, and effectively restores water polluted by heavy metals under acidic conditions, but the EPS extraction method described It is more complex, and the treatment of heavy metal-contaminated water bodies under acidic conditions has limited application in actual wastewater treatment
There are no literature reports on the use of activated sludge extracellular polymeric materials (EPS) for uranium-contaminated soil remediation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting activated sludge extracellular polymer, and adsorption application of activated sludge extracellular polymer in uranium polluted water/soil
  • Method for extracting activated sludge extracellular polymer, and adsorption application of activated sludge extracellular polymer in uranium polluted water/soil
  • Method for extracting activated sludge extracellular polymer, and adsorption application of activated sludge extracellular polymer in uranium polluted water/soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of extraction method of activated sludge extracellular polymer (EPS), comprises the following steps:

[0052] (1) Acquisition of activated sludge

[0053] The remaining activated sludge is used as raw material, and the sludge comes from a domestic sewage treatment plant in Wuhan. The sewage treatment plant adopts the A / A / O process; an appropriate amount of mud-water mixture is taken from the aerobic tank, and it is left to stand for 2 days, skimmed every day Remove the supernatant once to obtain concentrated activated sludge;

[0054] (2) Extraction of extracellular polymers

[0055] Mix the concentrated activated sludge to test its conductivity, the conductivity is 1752μS / cm, prepare a salt solution with the same conductivity with ultrapure water and NaCl, and heat it to 75°C in a water bath;

[0056] Centrifuge the activated sludge for 5 min under the centrifugal force of 4000g, remove the supernatant (1); resuspend the sludge sediment to the original volume ...

Embodiment 2

[0063] A kind of extraction method of activated sludge extracellular polymer (EPS), comprises the following steps:

[0064] (1) Acquisition of activated sludge

[0065] The remaining activated sludge is used as raw material, and the sludge comes from a domestic sewage treatment plant in Wuhan. The sewage treatment plant adopts the A / A / O process; an appropriate amount of mud-water mixture is taken from the aerobic tank, and it is left to stand for 1 day, skimmed every day Remove the supernatant once to obtain concentrated activated sludge;

[0066] (2) Extraction of extracellular polymers

[0067] Mix the concentrated activated sludge to test its conductivity, the conductivity is 1681μS / cm, prepare a salt solution with the same conductivity with ultrapure water and NaCl, and heat it to 70°C in a water bath;

[0068] Centrifuge the activated sludge at a centrifugal force of 4000g for 10min, remove the supernatant (1); resuspend the sludge to the original volume with NaCl solut...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
adsorption capacityaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of purification treatment, and concretely relates to a method for extracting an activated sludge extracellular polymer. The method mainly comprises the following steps: (1) uniformly mixing activated sludge, testing the electrical conductivity of the mixed activated sludge, preparing a sat solution having the same electric conductivity, centrifuging theactivated sludge, and removing the obtained supernatant to obtain an activated sludge precipitate; (2) re-suspending the activated sludge precipitate in the salt solution prepared in step (1), shearing, heating, cooling and centrifuging the obtained suspension, and collecting the obtained supernatant to obtain an activated sludge extracellular polymer solution; and (3) adding ethanol to the activated sludge extracellular polymer solution obtained in step (2) to precipitate a floc, and carrying out dialysis and freeze-drying, to obtain an activated sludge extracellular polymer solid. The extraction method has the advantages of few needed devices, simplicity in operation, low cost and no pollution; and the obtained activated sludge extracellular polymer can be applied to efficiently and quickly adsorb various metal ions in water / soil, and has the characteristics of large adsorption capacity and high adsorption rate.

Description

technical field [0001] The invention belongs to the technical field of purification treatment, and in particular relates to a biosorbent, that is, a method for extracting extracellular polymers from activated sludge, and its application in treating low-concentration metal ion-containing wastewater and soil. Background technique [0002] Against the backdrop of accelerated consumption of traditional energy sources and aggravated environmental pollution, various countries and regions are turning their attention to clean nuclear energy, especially in nuclear power generation. With the official approval of the "National Nuclear Power Medium and Long-Term Plan (2005-2020)", my country's nuclear power development has entered a new stage of development. However, the Fukushima nuclear power plant accident in Japan in 2011 led to the leakage of radioactive substances, which aroused people's panic and high concern about radioactive pollution. [0003] Uranium is the main fuel for nuc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F9/04B09C1/10
Inventor 李晔黄晶蒋玉萌肖华锋
Owner WUHAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap