Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for circularly extracting protein and humus from residual sludge after dehydration by combining ultrasonic method with acid process

A technique of recycling and extracting excess sludge, applied in peptide preparation methods, chemical instruments and methods, organic chemistry, etc., can solve problems such as inability to maximize resource utilization, poor biochemical performance, etc., with a short time to achieve and easy operation , the effect of low cost

Active Publication Date: 2014-08-20
哈尔滨工业大学高新技术开发总公司
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that the existing sludge recycling method can only extract a single substance from the sludge, cannot realize the maximum utilization of resources, and has poor biochemical performance, and provides a combined cycle using the ultrasonic method and the acid method. Method for extracting protein and humus in dewatered excess sludge

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 circularly extracting protein and humus from residual sludge after dehydration by combining ultrasonic method with acid process
  • Method for circularly extracting protein and humus from residual sludge after dehydration by combining ultrasonic method with acid process
  • Method for circularly extracting protein and humus from residual sludge after dehydration by combining ultrasonic method with acid process

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0029] Embodiment 1: A method of utilizing ultrasonic method and acid method to extract protein and humus in dewatered excess sludge in this embodiment is carried out according to the following steps:

[0030] 1. Ultrasonic cracking of the dehydrated excess sludge of urban sewage treatment plants under acidic conditions: adjust the excess sludge of urban sewage treatment plants to a pH of 1 to 3 with sulfuric acid at a concentration of 2mol / L, at a frequency of 20KHz, power density Crumble in a 1-2W / mL ultrasonic breaker for 10-30 minutes, then pass through a 100-mesh sieve to remove solid particulate matter on the sieve to obtain a lysate;

[0031] 2. Static precipitation promotes protein precipitation: the lysate is statically settled at room temperature for 30-60 minutes, so that the cracked protein is precipitated under acidic conditions;

[0032] 3. Extract protein by centrifugation: centrifuge the lysed solution after settling in a centrifuge at a temperature of 4-30°C a...

specific Embodiment approach 2

[0036] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pH in step 1 is 2. Others are the same as in the first embodiment.

[0037]In this embodiment, 2mol / L sulfuric acid is used to adjust to different pH values, the pH is 1, 2, and 3, and then ultrasonically treated, and the lysate is taken for detection. When the pH is 1, 2, and 3, the protein recovery rate is 75 %, but when the pH of the solution is equal to 3, the recovery rate of humic substances is only 57.8%. Considering the economic benefit and crushing effect, pH=2 is the optimum pH value.

specific Embodiment approach 3

[0038] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the power density in step 1 is 1.5 W / mL. Others are the same as in the first or second embodiment.

[0039] The sludge of this embodiment is ultrasonically treated under different ultrasonic power densities and different pHs, and the content of dissolved organic carbon (DOC) in the lysate is measured after ultrasonication. The results show that: under the same pH value, when the ultrasonic power When the density increased from 0W / mL to 1.5W / mL, the concentration of DOC in the lysate gradually increased, and then with the increase of ultrasonic power density, the dissolution and removal of DOC was gentle, so when the ultrasonic power density was 1.5W / mL Works best.

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
diameteraaaaaaaaaa
lengthaaaaaaaaaa
areaaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for circularly extracting protein and humus from residual sludge after dehydration by combining an ultrasonic method with an acid process and relates to a method for extracting the protein and humus from the residual sludge. The method disclosed by the invention can be used for solving the technical problems that the existing sludge recycling method only can extract single substance from the sludge, maximum use of resource can not be realized and biodegradability is poor. The method disclosed by the invention comprises the following steps: firstly, ultrasonically cracking the dehydrated residual sludge which is produced by a municipal sewage treatment plant under the acidic condition; secondly, standing and settling for promoting precipitation of protein; thirdly, centrifuging and extracting the protein; fourthly, filtering and separating the humus, and recycling filtrate. The method has the advantages that the protein and humus can be extracted at the same time, extraction is complete, biodegradability of the sludge left after extraction is increased to 75.7% from 40.2%, and the method can be applied to the field of resource recycling treatment of municipal sludge.

Description

technical field [0001] The invention relates to a method for extracting protein and humus from excess sludge, belonging to the field of solid waste treatment and resource utilization. Background technique [0002] Municipal sludge is a by-product of sewage treatment, mainly from the operation of primary settling tanks, secondary settling tanks and other process links. With the vigorous development of my country's sewage treatment business, more and more municipal sludge is produced. The sludge produced by sewage treatment plants contains a large amount of harmful substances such as heavy metals, diseased insect eggs, and parasites, but it also contains a large amount of Organic matter, N, P and other nutrients. Therefore, the current domestic and foreign sludge treatment and disposal processes have put forward the overall requirements of stabilization, reduction, resource utilization, and energy utilization. [0003] The composition of municipal sludge is mainly organic mat...

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): C07K1/30C07G99/00C08H99/00
Inventor 魏亮亮秦可娜赵庆良姜珺秋王琨
Owner 哈尔滨工业大学高新技术开发总公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com