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Method for removing heavy metals from sludge and special device thereof

A heavy metal and sludge dehydration technology, which is applied in sludge treatment, fertilization equipment, sewage/sludge fertilizer, etc., can solve the problems of long retention time of biological leaching, slow proliferation of sulfur bacteria, secondary pollution of heavy metal leachate, etc. , to achieve the effect of realizing harmless recycling, promoting utilization, and solving heavy metal pollution

Inactive Publication Date: 2010-12-01
娄底市裕德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main bacteria it uses, such as Thiobacillus, proliferate slowly, and the retention time of bioleaching is long; the leachate with high concentration of heavy metals will cause secondary pollution, which is the main obstacle restricting its large-scale application

Method used

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  • Method for removing heavy metals from sludge and special device thereof
  • Method for removing heavy metals from sludge and special device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Copper and zinc metal removal device and treatment process in sludge

[0017] refer to Attached picture:

[0018] (1) The sludge placed in the regulating tank 1 is sent into the bioleaching tank 3 through the sludge pump 2, and a low-frequency ultrasonic generator 4 is installed above the bioleaching tank 3. The frequency of the low-frequency ultrasonic generator 4 in this embodiment The frequency is 20Hz, and the amplitude is 20%. The sludge in the biological leaching tank is pretreated with low-frequency ultrasonic generator for 1min-15min; the mass transfer in the sludge system in the next step can be accelerated after the low-frequency ultrasonically enhanced pretreatment speed, and promote the utilization of substrate by acidophilic thiobacillus;

[0019] (2) After the ultrasonic enhanced pretreatment is completed, the substrate dosing device 5 is turned on, and ferrous sulfate and sulfur powder are added to the bio-forest filter 3 as the leaching sub...

Embodiment 2

[0022] Embodiment 2: Treatment effect of copper and zinc sludge

[0023] The solid content of the sludge in this example is 4.3%, and the contents of copper and zinc are 14.8g / kg and 620014.8g / kg respectively.

[0024] (1) The sludge regulating tank is 3200×3200×5000mm; the sludge placed in the regulating tank 1 is sent to the biological leaching tank 3 through the sludge pump 2, and the biological leaching tank is Φ2800×5000mm; There is a low-frequency ultrasonic generator 4, the frequency of the low-frequency ultrasonic generator 4 of the present embodiment is 20 Hz, and the amplitude is 20%; the sludge in the bioleaching tank is first carried out with a low-frequency ultrasonic generator for low-frequency ultrasonic intensive pretreatment for 1min-15min;

[0025] (2) After the ultrasonic enhanced pretreatment is completed, the substrate dosing device 5 is turned on, and ferrous sulfate and sulfur powder are added to the biological forest filter 3 as the leaching substrate, ...

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Abstract

The invention discloses a technology for removing heavy metals from sludge and a device thereof. The technology comprises the following steps: a sludge pump is used to send the sludge of a sludge adjusting pool to a biological leaching tank, an ultrasonic generator with the low-frequency of 10kHz-60kHz and the amplitude of 20% is used to perform low-frequency ultrasonic wave strengthening pretreatment to the sludge in the biological leaching tank for 1-15min; then biological leaching treatment is performed; a settling pond is used for separation, wherein a sewage pump is used to pump the supernate with heavy metals to an electroflocculation machine and perform electroflocculation treatment according to the existing electroflocculation technology, sludge is dewatered with a sludge dewatering device, alkali is added to neutralize the dewatered sludge and the neutralized sludge can be used as fertilizer; and the filtrate generated by the sludge dewatering device is returned to the electroflocculation device for treatment. The technology of the invention utilizes the ultrasonic wave strengthening pretreatment to accelerate the mass transfer speed of the sludge system and facilitate acidophilic thiobacillus to utilize the substrate; the digestion period of microbes is reduced, the efficiency is increased; the electroflocculation device is used to treat the wastewater with heavy metals; and the secondary pollution problem is overcome, thus solving the heavy metal problem of sludge and realizing harmless resource utilization.

Description

technical field [0001] The invention relates to the field of environmental protection, and is suitable for removing heavy metals in municipal sludge and various industrial sludge. Background technique [0002] With the acceleration of urbanization in my country, the sludge output of urban sewage treatment plants has also increased sharply. Most of these sludges are active microbial cells, which not only contain fertilizer elements such as nitrogen, phosphorus and potassium, but also pathogenic bacteria and heavy metals. The problem of heavy metal removal is more difficult to solve, because most of these heavy metals It exists in the form of complexes with organisms; if most of the heavy metals in activated sludge can be removed, then the agricultural use of sludge is a good way out. CN200410014801.X discloses a biological removal process for heavy metals in sludge and its equipment. The device includes a sludge regulating tank, a bioleaching tank connected to the outlet of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F1/463C05F7/00
CPCY02A40/20
Inventor 胡本燕王韬
Owner 娄底市裕德科技有限公司
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