Method for catalyzing ozone to reinforce sludge dewatering by using sludge-derived biochar

A technology of sludge dehydration and biochar, applied in water/sludge/sewage treatment, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve enhanced sludge dehydration effect, efficient destruction of sludge floc structure, lightening The effect of environmental capacity loading

Inactive Publication Date: 2021-05-14
TONGJI UNIV
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, get rid of the addition of traditional chemical coagulants, provide a method for efficiently catalyzing ozone oxidation to strengthen sludge dewatering performance, and at the same time realize the recycling and reuse of sewage plant sludge , reduce transportation costs, avoid secondary pollution and other problems

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 catalyzing ozone to reinforce sludge dewatering by using sludge-derived biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present invention provides a method for utilizing sludge-derived biochar to catalyze ozone-enhanced sludge dehydration. The specific implementation process is as follows:

[0031] (1) Preparation of sludge derived biochar:

[0032] The sludge from the sewage plant was dried at 80°C, ground and sieved through a 60-mesh sieve; calcined in a tube furnace at 600°C, with nitrogen as the carrier gas, the gas flow rate was controlled at 100mL / min, and the temperature was 8°C / min. The heating rate of min starts the pyrolysis program from room temperature, the pyrolysis time is controlled at 60 min, and the cooling rate is 10 °C / min down to room temperature to end the pyrolysis process, and the sludge biochar is collected; the Mn(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2O Prepare a solution with a molar ratio of manganese and iron of n(Mn):n(Fe)=1:1, add sludge biochar to the solution, and stir for 10 minutes at a stirring speed of 100rpm / min to make the solution evenly mix...

Embodiment 2

[0036] The present invention provides a method for utilizing sludge-derived biochar to catalyze ozone-enhanced sludge dehydration. The specific implementation process is as follows:

[0037] (1) Preparation of sludge derived biochar:

[0038] The sludge from the sewage plant was dried at 90°C, ground and sieved through an 80-mesh sieve; calcined in a tube furnace at 750°C, with nitrogen as the carrier gas, the gas flow rate was controlled at 120mL / min, and the temperature was 10°C / min. The heating rate of min starts the pyrolysis program from room temperature, the pyrolysis time is controlled to 80min, the cooling rate is 15°C / min down to room temperature to end the pyrolysis process, and the sludge biochar is collected; the MnCl 2 4H 2 O and FeCl 3 ·6H 2 O Prepare a solution with a molar ratio of manganese and iron of n(Mn):n(Fe)=1:2, add sludge biochar to the solution, and stir for 15 minutes at a stirring speed of 150 rpm / min to make the solution evenly mixed ;Use ultra...

Embodiment 3

[0042] The present invention provides a method for utilizing sludge-derived biochar to catalyze ozone-enhanced sludge dehydration. The specific implementation process is as follows:

[0043] (1) Preparation of sludge derived biochar:

[0044] The sludge from the sewage plant was dried at 110°C, ground and sieved through a 100-mesh sieve; calcined in a tube furnace at 1080°C, with nitrogen as the carrier gas, the gas flow rate was controlled at 300mL / min, and the temperature was 20°C / min. The heating rate of min starts the pyrolysis program from room temperature, the pyrolysis time is controlled to 260min, the cooling rate is 30°C / min down to room temperature to end the pyrolysis process, and the sludge biochar is collected; KMnO 4 and FeSO 4 ·7H 2 O Prepare a solution with a molar ratio of manganese and iron of n(Mn):n(Fe)=2:5, add sludge biochar to the solution, and stir for 20 minutes at a stirring speed of 150rpm / min to make the solution evenly mixed ;Use ultrasonic powe...

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

No PUM Login to view more

Abstract

The invention relates to a method for catalyzing ozone to reinforce sludge dewatering by utilizing sludge-derived biochar. The method comprises the following steps: (1) preparing the sludge-derived biochar: performing high-temperature calcination and pyrolysis on sludge to obtain the sludge biochar, mixing the sludge biochar with Mn < 2 + > and Fe < 3 + > solutions, stirring, performing ultrasonic treatment, adding alkali liquor, performing thermal activation, standing, aging, washing and performing vacuum drying, and obtaining the sludge-derived biochar loaded with the iron-manganese spinel; and (2) sludge reinforced dehydration: adjusting the pH value of the sludge to be dehydrated to weak acidity, adding the sludge to a conditioning reaction device, adding the sludge-derived biochar, uniformly stirring, introducing ozone for treatment, and dehydrating to obtain the dehydrated sludge. According to the method, the sludge derived biochar with efficient catalytic performance is prepared from the sludge of the sewage plant, ozone treatment is coupled, the dewatering performance of the sludge can be effectively improved, the dosage of chemicals is reduced, secondary pollution is avoided, the subsequent transportation and treatment cost of the sludge is saved, and safe treatment of the sludge is facilitated.

Description

technical field [0001] The invention relates to the field of sludge treatment and disposal, in particular to a method for using sludge-derived biochar to catalyze ozone-enhanced sludge dehydration. Background technique [0002] The moisture content of the sludge is too high (97-99%), the composition is complex, the stability is poor, and it contains hydrophilic substances in a colloidal structure, which is not easy to dehydrate and is in a fluid or semi-fluid state, which increases the risk of subsequent transportation and final disposal. Economic cost and waste of resources. Therefore, before final disposal, it is mostly conditioned to enhance dehydration performance, reduce moisture content, and reduce volume. Deep dewatering of sludge is an important premise and key step to realize sludge safety management and terminal ecological disposal, and it is also a core problem that needs to be solved urgently. [0003] At present, the existing sludge dewatering methods are divi...

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): C02F11/06C02F11/143B01J23/889
CPCC02F11/143C02F11/06B01J23/005B01J23/8892C02F2305/023
Inventor 董滨肖婷婷陈思思盛乾
Owner TONGJI UNIV
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