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A purification method and application of heavy metals in sludge

A heavy metal and sludge technology, applied in the field of environmental protection and comprehensive resource utilization, can solve the problems of poor treatment effect and long treatment cycle, and achieve the effects of simple operation, reduced heavy metal content, and improved removal efficiency

Active Publication Date: 2020-09-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a purification method of heavy metals in sludge and its application, which is used to solve the technical defects of poor treatment effect and long treatment period in the prior art in the treatment method of heavy metals in sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Aspergillus niger was inoculated in potato-sucrose medium, cultured at a constant temperature of 30°C for 72 hours to obtain mature spores, and the obtained mature spores were dissolved in 300 mL of sterile deionized water to prepare spore suspension 1. In spore suspension 1, the number of spores is 1×10 7 individual / mL.

[0028] 1 mL of spore suspension 1 was dissolved in 100 mL of potato-sucrose liquid medium, sealed with gauze, fermented and cultured for 6 days at 28°C and a shaker speed of 180 r / min, and filtered and purified to obtain fermentation product 1. The method of filtration and purification is as follows: the fermentation culture liquid is transferred to a Buchner funnel covered with two layers of medium-speed filter paper, and the filtrate is collected by vacuum filtration.

[0029] Mix 1g of sludge with 50mL of fermentation product 1, place it on a shaker at 180r / min for 3h, then move the mixed system into an ultrasonic reactor, set the ultrasonic frequ...

Embodiment 2

[0032] Aspergillus niger was inoculated in potato-sucrose medium, cultured at 28°C for 120 hours at a constant temperature to obtain mature spores, and the obtained mature spores were dissolved in 300 mL of sterile deionized water to prepare spore suspension 2. In spore suspension 2, the number of spores was 3.6×10 6 individual / mL.

[0033] 1.5 mL of spore suspension 2 was dissolved in 100 mL of potato-sucrose liquid medium, sealed with gauze, fermented and cultured for 5 days at 28°C and a shaker speed of 200 r / min, and filtered and purified to obtain fermentation product 2. The method of filtration and purification is as follows: the fermentation culture liquid is transferred to a Buchner funnel covered with two layers of medium-speed filter paper, and the filtrate is collected by vacuum filtration.

[0034] Mix 3g of sludge with 100mL of fermentation product 2, put it on a shaking table at 200r / min for 2h, then move the mixed system into an ultrasonic reactor, set the ultr...

Embodiment 3

[0037] Aspergillus niger was inoculated in potato-sucrose medium, cultured at a constant temperature of 29°C for 96 hours to obtain mature spores, and the obtained mature spores were dissolved in 300 mL of sterile deionized water to prepare spore suspension 3. In spore suspension 3, the number of spores is 2×10 6 individual / mL.

[0038] 2 mL of spore suspension 3 was dissolved in 100 mL of potato-sucrose liquid medium, sealed with gauze, fermented and cultured for 5 days at 29°C and a shaker speed of 190 r / min, and filtered and purified to obtain fermentation product 3. The method of filtration and purification is as follows: the fermentation culture liquid is transferred to a Buchner funnel covered with two layers of medium-speed filter paper, and the filtrate is collected by vacuum filtration.

[0039] Mix 3g of sludge with 100mL of fermentation product 3, place it on a shaking table at 200r / min for 2.5h, then move the mixed system into an ultrasonic reactor, set the ultras...

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Abstract

The invention belongs to the fields of environmental protection and comprehensive utilization of resources and particularly relates to a purification method of heavy metals in sludge and application of the purification method. The purification method comprises the following steps: (1) preparing a spore suspension; (2) fermenting; (3) leaching; (4) ultrasonic radiation; and (5) leaching. The invention further discloses the application of the purification method in the field of treatment of environment-friendly solid waste. Experimental determination shows that after the sludge is purified by virtue of the technical scheme provided by the invention, the heavy metal content of the sludge is remarkably reduced. According to the purification method, organic acid is produced by virtue of the cooperation of ultrasonic waves and Aspergillus niger so as to remove heavy metals from municipal sludge for the first time, the operation is simple and convenient, and the removal efficiency of the heavy metals in the sludge is improved; and meanwhile, the treated sludge meets agricultural sludge standards in China, and the reutilization of resources can be realized.

Description

technical field [0001] The invention belongs to the fields of environmental protection and resource comprehensive utilization, and in particular relates to a method for purifying heavy metals in sludge and its application. Background technique [0002] With the gradual acceleration of the industrialization process and the continuous development of the economy and society, the output of sludge is increasing day by day. According to statistics, the output of urban sludge in my country has reached more than 30 million tons per year, and it is increasing at a rate of about 10% every year. The problem of sludge treatment is becoming increasingly urgent. The heavy metal content in urban sludge in my country is high. These highly toxic heavy metal elements enter the soil with the sludge, seriously threatening the safety of the ecological environment and human health. Effectively reducing the total amount of heavy metals in the sludge of urban sewage treatment plants is the key to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/02
CPCC02F11/00C02F11/02
Inventor 郑莉孙水裕李海妃许燕滨刘敬勇
Owner GUANGDONG UNIV OF TECH
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