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

Method for removing low-concentration heavy metal in waste water by sludge absorption

A low-concentration heavy metal and sludge adsorption technology, applied in the direction of adsorption water/sewage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of high cost and secondary pollution, and achieve great promotion potential, Strong practicability and wide applicability

Inactive Publication Date: 2009-08-26
TONGJI UNIV
View PDF1 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of this invention is to address the defects of the above-mentioned method in the treatment of large water volume and low-concentration heavy metal wastewater, and propose a heavy metal separation method using sludge as a non-living biomass adsorbent to solve the problem of conventional methods for processing low-concentration heavy metal wastewater. Cost and secondary pollution and other issues, efficient, cheap and green control of low-concentration heavy metal pollution in the water environment

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The treatment object is river water polluted by Pb, and its Pb concentration is determined to be 25mg / L by inductively coupled plasma emission spectrometry.

[0025] The dewatered sludge was taken from an urban sewage plant in Shanghai, dried in an oven at 50°C for 72 hours to constant weight, taken out and ground, and then passed through a 0.45mm national standard sieve, and the undersieve was non-living biomass adsorbent. Use HCl to adjust the pH of the river water to be treated to 3.5, add 10m 3 volume of stirred tank reactor, and then press every 1m 3 The ratio of 4kg of river water was added to the adsorbent; the stirring speed was controlled to 200r / min, and the mixing reaction was carried out at room temperature for 60min. The supernatant is clean river water from which heavy metals have been separated and removed. The Pb concentration is 0.06mg / L as measured by inductively coupled plasma emission spectrometry, and the removal rate of Pb reaches 99.76%. It can b...

Embodiment 2

[0027] The object of treatment is a metal processing plant subject to Cd and Cr 3+ Contaminated industrial wastewater, the concentration of hexavalent chromium in the wastewater measured by AWWA-3500 spectrophotometry is lower than the detection limit of the method, and the initial concentration of Cd and Cr are 10mg / L and 50mg / L respectively, measured by inductively coupled plasma emission spectrometry , Cr is calculated from the concentration difference between total chromium and hexavalent chromium 3+ The initial concentration is 50mg / L.

[0028] The dewatered sludge was taken from an urban sewage plant in Shanghai, dried in an oven at 55°C for 48 hours to constant weight, taken out and ground, and then passed through a 0.45mm national standard sieve, and the under-sieve was non-living biomass adsorbent. Use HCl to adjust the pH of the wastewater to 4, add 15m 3 volume of stirred tank reactor, and then press every 1m 3 The ratio of 2kg of waste water was added to the ads...

Embodiment 3

[0030]The object of treatment is an electroplating plant containing Cu and Cr 3+ For the industrial wastewater, the AWWA-3500 spectrophotometric method was used to measure the concentration of hexavalent chromium in the wastewater, which was lower than the detection limit of the method. It was measured by inductively coupled plasma emission spectrometry. Calculation of hexavalent chromium concentration difference Cr 3+ The initial concentration is 100mg / L.

[0031] Using the present invention as the pretreatment process of the biological treatment process, the dewatered sludge is taken from an urban sewage plant in Shanghai, dried in an oven at 55°C for 48 hours to constant weight, taken out and ground, and then passed through a 0.45mm national standard sieve, and the undersieve It is a non-living biomass adsorbent. Use HCl to adjust the pH of the wastewater to 4, add 15m 3 volume of stirred tank reactor, and then press every 1m 3 The ratio of 10kg of wastewater was added ...

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

A method for removing low-concentration heavy metal in waste water by sludge absorption relates to an isolation technology of heavy metal in waste water. Waste water and sludge of sewage factories are dried at the temperature of 45 to 60 DEG C, crushed to below 0.45 mm, mixed and reacted with low-concentration heavy metal waste water, and the pH is controlled between 3 to 6. After solid-liquid separation, the heavy metal in waste water is purified. The surface radicals of sludge has absorption ability for heavy metal and the remaining sludge of city sewage factories is selected as non-living biomass absorbent to treat waste water so that the method has the advantages of low cost, wide source, simple device, convenient operation and few secondary pollution. The method is particularly applicable to treatment of large-capacity and low-construction heavy metal in waste water, and also can be used for isolating heavy metal as pretreatment working procedure of various biological water treatment technologies. The waste is controlled by waste while high-efficiently isolating heavy metal, therefore, a new way is provided for city sludge resource recycle, ,and the method also has very great potential at the aspect of industrial extension and great economic, social and environmental benefits.

Description

technical field [0001] The invention discloses a method for removing low-concentration heavy metals in wastewater by sludge adsorption, relates to a treatment process for low-concentration heavy metal wastewater, and belongs to the technical field of heavy metal separation in water treatment technology. Background technique [0002] The continuous development of modern industry has also brought enormous pressure to the environment. Heavy metals discharged from electroplating, mining, smelting, tanning and other industries enter the water environment system and have a serious impact on the ecological environment. The heavy metal-containing wastewater produced by these industries must be separated and purified to control its pollution. Traditional heavy metal separation methods mainly include: chemical precipitation method, ion exchange method, electrochemical method, solvent extraction method, membrane separation method, etc. The main disadvantages are high operating costs an...

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): C02F1/28C02F1/62B01J20/24C02F11/00C02F101/20
Inventor 何品晶吴骏邵立明章骅姚倩
Owner TONGJI UNIV
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