The method of removing heavy metal absorbent lac/paa combined with traditional water treatment process to remove low concentration pb(ii)

An absorbent, heavy metal technology, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of limited application and development, high treatment cost, low cost, high efficiency, The effect of saving resources

Active Publication Date: 2021-05-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for other methods, due to the high processing cost, there are many problems to be solved in practical application, which limits their application and development [22,23]

Method used

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  • The method of removing heavy metal absorbent lac/paa combined with traditional water treatment process to remove low concentration pb(ii)
  • The method of removing heavy metal absorbent lac/paa combined with traditional water treatment process to remove low concentration pb(ii)
  • The method of removing heavy metal absorbent lac/paa combined with traditional water treatment process to remove low concentration pb(ii)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Using XJ river water as raw water to configure contaminated water containing Pb(II), pH=7.6, Pb(II) concentration of 51 μg / L, after adding 25 mg / L LAC / PAA for adsorption for 20 minutes, the effluent Pb (II) The concentration is 8.6μg / L, which meets the requirements of the WHO water quality standard.

Embodiment 2

[0059] Example 2: A water sample contaminated with Pb(II), pH=8.5, Pb(II) concentration was 46 μg / L, after adding 22 mg / L LAC / PAA for adsorption for 20 minutes, the effluent Pb(II) concentration was 7.6μg / L, which meets the requirements of WHO water quality standards.

Embodiment 3

[0060] Example 3: A water sample contaminated with Pb(II), pH=4.6, Pb(II) concentration was 35 μg / L, the pH was adjusted to 8.0, and 20 mg / L of LAC / PAA was added for adsorption for 20 minutes. The concentration of Pb(II) was 7.6μg / L, which met the requirements of the WHO water quality standard.

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Abstract

The invention discloses a method for removing low-concentration Pb(II) in combination with a heavy metal removing absorbent LAC / PAA and a traditional water treatment process. A low-cost heavy metal-removing absorbent (LAC / PAA) was prepared. Compared with activated carbon used in ordinary water purification plants (pH=6-10), the acidic groups on the surface of LAC / PAA increased (pH=4.8), thus obtaining adsorption The function of removing heavy metals. For the raw water polluted by Pb(II), the raw water quality should be analyzed first. If Pb(II)≤50μg / L, it can be directly absorbed by LAC / PAA, which can meet the requirements of WHO water quality guidelines. If 50μg / L

Description

technical field [0001] The invention relates to the technical field of removing heavy metals in water, in particular to a method for removing low-concentration Pb(II) by combining a low-cost heavy metal removing absorbent LAC / PAA with a traditional water treatment process. Background technique [0002] However, the emergency treatment of heavy metal lead (Pb(II)) contamination in drinking water is rarely reported [18] . Although chemical precipitation technology is defined as the method of emergency removal of heavy metals from water [16] However, according to the World Health Organization's drinking water quality guidelines, the allowable limit of Pb(II) in drinking water is 10 μg / L (WHO, 2011), which cannot be achieved by a single chemical precipitation technology. Therefore, there is an urgent need to develop a cost-effective emergency water treatment technology for the removal of trace Pb(II) contamination, which is not only efficient, easy to operate, but also easy to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F9/04C02F101/20
CPCC02F1/283C02F1/285C02F1/5245C02F1/66C02F9/00C02F2101/20
Inventor 董丽华潘淑杰刘婧顾平张光辉
Owner TIANJIN UNIV
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