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Sludge particles for removing heavy metal and preparation method and application thereof

A technology of sludge granules and spherical granules, applied in the fields of alkali metal compounds, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of long-term removal of heavy metals, sludge resource utilization, water treatment facility penetration rate Reduce and reduce the service life of facilities and other issues, to achieve the effect of effective control of heavy metals, low loss rate, and not easy to be washed away

Inactive Publication Date: 2019-04-16
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sludge powder from the water supply plant is easy to compact, and when used as an adsorbent in the project, it will easily lead to a decrease in the penetration rate of the water treatment facility, accelerate the clogging of the facility and reduce the service life of the facility, and it is difficult to achieve long-term removal of heavy metals and resource utilization of sludge
In addition, polyaluminum chloride is often used as a coagulant for coagulation and sedimentation in water supply plants, and the generated sludge contains a lot of aluminum elements, which leads to the release of aluminum ions during its use and potential harm to the environment

Method used

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  • Sludge particles for removing heavy metal and preparation method and application thereof
  • Sludge particles for removing heavy metal and preparation method and application thereof
  • Sludge particles for removing heavy metal and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0031] The preparation process of the following sludge particle adsorbent is as follows: figure 1 shown.

[0032] The oven DHG-9070A used below was purchased from Shanghai Jinghong Experimental Equipment Co., Ltd.

[0033] The muffle furnace SX used below 2 -4-10, Tianjin Zhonghuan Experimental Electric Furnace Co., Ltd.

Embodiment 1

[0035] Weigh 120g of water supply plant sludge powder and 240g of clay, add appropriate amount of water to mix, mechanically stir evenly, make spherical particles with a particle size of about 2mm, and dry at 105°C for 2 hours to make the water content less than 2%. Put it in a muffle furnace for calcination at 600°C for 60 minutes, and after cooling, get the sludge particle adsorbent for water supply plant.

[0036] Using a scanning electron microscope to observe the internal morphology of the water plant sludge particle adsorbent prepared in this example, the results are as follows figure 2 shown. It can be seen that the surface of the sludge particle adsorbent in the water supply plant is rough and the pores are developed; the energy spectrum ( image 3 ) shows that the sludge particle adsorbent of the water supply plant is mainly composed of O, Si, Al, and Fe, indicating that the particle has a strong adsorption capacity.

[0037] The water plant sludge particle adsorbe...

Embodiment 2

[0039] The water supply plant sludge particle adsorbent differs from Example 1 only in that the dry weight ratio of water supply plant sludge powder to clay is 2:1.

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Abstract

The invention relates to sludge particles for removing a heavy metal and a preparation method and application thereof. A sludge particle adsorbent is prepared by mixing sludge of a water supply plantand clay with water, forming spherical particles, drying and firing. The dry weight ratio of the sludge of the water supply plant to the clay is (1:1)-(1:4). It is found that when the dry weight ratioof the sludge of the water supply plant and the clay is within the above range, the obtained sludge particle adsorbent is better balanced in the three aspects of aluminum release amount, loss rate and heavy metal removal rate. The method prepares the novel sludge particles by using the sludge of the water supply plant and the clay as raw materials, can effectively remove heavy metal pollution ofa water body, has low aluminum ion release amount and high strength, is not easily dispersed, and has the advantages of energy saving, economic performance and high efficiency.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a sludge particle for removing heavy metals and a preparation method and application thereof. Background technique [0002] Heavy metals are important pollutants with potential hazards. Heavy metals that enter the environment through various channels are not degradable, can migrate and circulate in the ecosystem, and finally enter the top of the biological chain, causing serious harm to humans. [0003] Adsorption has gradually become a common method for heavy metal removal due to its simple operation, low operating cost, and good removal effect. Among them, the cheap and easy-to-obtain, green and environmentally friendly adsorbents with good adsorption effect are very important to realize the adsorption and removal of heavy metals. The sludge from the water supply plant has a high specific surface area, which can adsorb and remove heavy metals in the water. However, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/28019B01J20/28059B01J20/28085C02F1/285C02F2101/20
Inventor 杜晓丽崔申申王倩李俊奇
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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