Method for extracting natural acid-pickling corrosion inhibitor from surplus sludge and application thereof

A technology of excess sludge and corrosion inhibitor, which is applied in the field of environmental protection, comprehensive utilization of resources and surface of metal materials, can solve problems such as application restrictions and environmental pollution, and achieve simple and easy operation, wide source of raw materials, and simple and easy extraction method line effect

Active Publication Date: 2014-12-10
GUANGDONG UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The remaining sludge in the operation of urban domestic sewage treatment plants contains a large amount of perishable organic substances, including proteins, polysaccharides, lipids and parasite eggs, pathogenic microorganisms or other toxic and harmful substances. If they are not properly treated, they will cause environmental damage. direct or indirect pollution
Although methods such as landfill and incineration can effectively realize the treatment and disposal of excess sludge, there are many limitations in application. Therefore, comprehensive utilization of sludge as a resource has become an important direction

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 natural acid-pickling corrosion inhibitor from surplus sludge and application thereof
  • Method for extracting natural acid-pickling corrosion inhibitor from surplus sludge and application thereof
  • Method for extracting natural acid-pickling corrosion inhibitor from surplus sludge and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0021] The remaining sludge comes from the secondary settling tank of the urban domestic sewage treatment plant. The properties of the sludge are as follows: the moisture content of the remaining sludge is 96.0% (wt.), MLSS is 40.0 g / L, and MLVSS is 27.2 g / L. Before sludge hydrolysis, ultrasonic pretreatment was used to destroy the floc structure of sludge. The working conditions of the ultrasonic reactor were: pretreatment time 90 minutes, ultrasonic frequency 40 kHz. Take 100ml of the pretreated sludge and put it in a stoppered glass container, add 12ml of concentrated hydrochloric acid (37.0% wt.), seal it with a plastic film and place it in a constant temperature water bath for heating and hydrolysis. The hydrolysis temperature is 70±0.5°C. The hydrolysis time is 22 hours. After hydrolysis, the insoluble residue is removed by filtration, and the obtained reddish-brown transparent liquid is the corrosion inhibitor. The amino acid concentration in the obtained solution measur...

preparation Embodiment 2

[0023] The remaining sludge comes from the secondary settling tank of the urban domestic sewage treatment plant. The properties of the sludge are as follows: the moisture content of the remaining sludge is 97.0% (wt.), MLSS is 30.0 g / L, and MLVSS is 18.9 g / L. Before sludge hydrolysis, ultrasonic pretreatment was used to destroy the floc structure of sludge. The working conditions of the ultrasonic reactor were: pretreatment time 90 minutes, ultrasonic frequency 40 kHz. Take 100ml of pretreated sludge and put it in a glass container with a stopper, add 12ml of concentrated hydrochloric acid (37.0% wt.), seal it with a plastic film and place it in a constant temperature water bath for heating and hydrolysis. The hydrolysis temperature is 90±0.5°C. The hydrolysis time is 14 hours. After hydrolysis, the insoluble residue is removed by filtration, and the obtained reddish-brown transparent liquid is the corrosion inhibitor. The amino acid concentration in the obtained solution measu...

preparation Embodiment 3

[0025] The remaining sludge comes from the secondary settling tank of the urban domestic sewage treatment plant. The properties of the sludge are as follows: the moisture content of the remaining sludge is 98.0% (wt.), MLSS 20.0 g / L, and MLVSS 12.6 g / L. Before sludge hydrolysis, ultrasonic pretreatment was used to destroy the floc structure of sludge. The working conditions of the ultrasonic reactor were: pretreatment time 90 minutes, ultrasonic response frequency 40 kHz. Take 100ml of pretreated sludge into a glass container with a stopper, add 10ml of concentrated hydrochloric acid (37.0% wt.), seal it with a plastic film, and place it in a constant temperature water bath for heating and hydrolysis. The hydrolysis temperature is 100±0.5°C. The hydrolysis time is 18 hours. After hydrolysis, the insoluble residue is removed by filtration, and the obtained reddish-brown transparent liquid is the corrosion inhibitor. The amino acid concentration in the obtained solution measured ...

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 discloses a method for extracting a natural acid-pickling corrosion inhibitor from surplus sludge and an application thereof. The method is characterized in that the surplus sludge produced by an urban sewage treatment plant is taken as a raw material, and active ingredients in the surplus sludge are extracted as the acid-pickling corrosion inhibitor by utilizing a hydrochloric acid hydrothermal method after the structure of the surplus sludge is damaged by carrying out ultrasonic pretreatment; and the natural acid-pickling corrosion inhibitor is applied to the surface acid pickling of steel. As the main active ingredients are obtained by carrying out acid hydrolysis on the surplus sludge, the natural acid-pickling corrosion inhibitor has the advantages of low use level, wide raw material source, simple, convenient and feasible extraction method and the like, and the extracted corrosion inhibitor is easily subjected to biodegradation and is nonhazardous to environments.

Description

technical field [0001] The invention relates to the technical fields of environmental protection, resource comprehensive utilization, metal material surface and the like, in particular to a method for extracting a natural pickling corrosion inhibitor from excess sludge and its application. Background technique [0002] The use of corrosion inhibitors in the pickling process of steel is a common practice to prevent excessive corrosion of steel. Traditional corrosion inhibitors commonly used in industrial production include chromates, molybdates, tungstates, organic amines, thioureas, etc., although These corrosion inhibitors have remarkable corrosion inhibition effects, but they have disadvantages such as high toxicity, refractory degradation, and high cost. The application of these corrosion inhibitors will bring some economic and environmental problems. Therefore, cheap green natural environment-friendly corrosion inhibitors are an important direction for the development of...

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 Patents(China)
IPC IPC(8): C02F11/10C23G1/06
Inventor 汤兵苏文丁杰伟
Owner GUANGDONG 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