Breeding method for sludge in granules, and method for retreaving gold from waste liquor of containing gold by using the breeding method

A granular sludge and gold recovery technology, applied in sludge treatment, chemical instruments and methods, biochemical equipment and methods, etc., to achieve excellent flocculation properties, easy follow-up treatment, and simple cultivation

Inactive Publication Date: 2006-12-06
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the granular sludge that has been successfully cultivated is only suitable for removing or reducing the concentration of heavy metal ions or organic matter in industrial wastewater and domestic sewage. There is no report on the use of granular sludge to recover precious metals such as gold and purify wastewater.

Method used

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  • Breeding method for sludge in granules, and method for retreaving gold from waste liquor of containing gold by using the breeding method
  • Breeding method for sludge in granules, and method for retreaving gold from waste liquor of containing gold by using the breeding method

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Effect test

Embodiment 1

[0026] The granular sludge used to recover gold from waste liquid and purify waste water is cultivated as follows: sludge is collected from the aeration tank of the sewage treatment plant, sieved and washed with physiological saline, the supernatant is discarded, and the sedimentation Add the culture medium at a ratio of about 1 / 2 of the volume of the mud and the culture medium, adjust the pH to 6.8, stir evenly, and culture at room temperature of 15°C in the dark, and change the culture every 1 day base, adjust the pH value, and stir evenly; after 12 times of medium replacement, it is enough. Described medium composition is as follows: Sodium nitrate 0.25g l -1 , sodium acetate 0.2g l -1 , sodium succinate 1.0g l -1 , sodium thioglycolate 0.1g l -1 , iron quinate 2mg l -1 , Vitamin B 12 0.05 mg l -1 , magnesium sulfate 0.01mg l -1 , manganese sulfate 0.01mg l -1 , zinc sulfate 0.01mg l -1 . The cultivation of granular sludge roughly goes through five stages: floccul...

Embodiment 2

[0028] The granular sludge used to recover gold from waste liquid and purify wastewater is obtained by culturing as follows: collect sludge from the aeration tank of Jizhuangzi Wastewater Treatment Plant in Tianjin, sieve and wash with normal saline, and discard the supernatant solution, add the medium in the ratio of about 1 / 3 of the volume of the mud to the medium, adjust the pH to 7.6, stir evenly, and culture at room temperature of 25°C in the dark, every 1 Change the medium once a day, adjust the pH value, and stir evenly; only after 18 medium changes. Described medium composition is as follows: Sodium nitrate 0.25g l -1 , sodium acetate 0.2g l -1 , sodium succinate 1.0g l -1 , sodium thioglycolate 0.1g l -1 , iron quinate 2mg l -1 , Vitamin B 12 0.02 mg l -1 , magnesium sulfate 0.005mg l -1 , manganese sulfate 0.005mg l -1 , zinc sulfate 0.005mg l -1. The cultivation of granular sludge roughly goes through five stages: flocculent sludge, flocculent sludge, appe...

Embodiment 3

[0030] The granular sludge used to recover gold from waste liquid and purify waste water is cultivated as follows: sludge is collected from the aeration tank of the sewage treatment plant, sieved and washed with physiological saline, the supernatant is discarded, and the sedimentation In the medium, add the medium at a ratio of about 1 / 4 of the volume of the mud and the medium, adjust the pH to 7, stir evenly, and culture at room temperature of 20°C in the dark, and change the culture every 1 day base, adjust the pH value, and stir evenly; after 16 times of medium replacement, it is enough. Described medium composition is as follows: Sodium nitrate 0.25g l -1 , sodium acetate 0.2g l -1 , sodium succinate 1.0g l -1 , sodium thioglycolate 0.1g l -1 , iron quinate 2mg l -1 , Vitamin B 12 0.03 mg l -1 , magnesium sulfate 0.008mg l -1 , manganese sulfate 0.008mg l -1 , zinc sulfate 0.008mg l -1 . The cultivation of granular sludge roughly goes through five stages: floccul...

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Abstract

This invention relates to methods for culturing granular sludge and utilizing the granular sludge to recover gold from wastewater containing gold. The method for culturing granular sludge comprises: (1) collecting sludge from the aeration tanks of a wastewater treating plant, washing with physiological saline, and discharging the supernatant; (2) adding 1/4-1/2 culture medium to the sludge, adjusting the pH value to 6.8-7.6, stirring evenly, standing in the dark at 15-25 deg.C, changing the culture medium every two days to obtain the granular sludge after 12-20 times. The method for recovering gold comprises: (1) adding the granular sludge to wastewater containing gold, and placing in a thermostatic shaking bed; (2) adsorbing adequately, precipitating by gravity, adding a replacing metal to the desorption solution to obtain gold. The methods have such advantages as high gold ion adsorption rate (99.9-100%), high desorption rate (99.5%), and high gold recovery rate (higher than 98.3%).

Description

technical field [0001] The invention relates to a method for cultivating granular sludge and a method for recovering gold from gold-containing waste liquid by using granular sludge. Background technique [0002] Gold element has many advantages such as excellent physical, chemical and electrical properties, and is widely used in high-tech electronic products, most of which exist in the form of gold, gold-copper or gold-copper-nickel. In today's era, with the rapid development of science and technology, electronic products carrying the mission of scientific and technological information are updated at an alarming rate, and the discharge of gold-containing waste liquid and solid waste is increasing. However, the reserves of gold resources in my country and even the world are seriously deficient, so if they are discharged without treatment, it will not only pollute the environment, but also cause a serious waste of gold resources, endangering the sustai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/00C02F11/00C22B11/00C22B7/00C22B3/24
CPCY02P10/20
Inventor 孙津生宋慧平李鑫钢徐世民田玉峰王艳红
Owner TIANJIN UNIV
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