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Method for removing low-concentration Pb (II) by combining heavy metal absorbent LAC/PAA with traditional water treatment process

An absorbent and heavy metal technology, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of limited application and development, high treatment cost, etc., to achieve convenient emergency dosing, economical Good benefit and high efficiency

Active Publication Date: 2019-10-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for removing low-concentration Pb (II) by combining heavy metal absorbent LAC/PAA with traditional water treatment process
  • Method for removing low-concentration Pb (II) by combining heavy metal absorbent LAC/PAA with traditional water treatment process
  • Method for removing low-concentration Pb (II) by combining heavy metal absorbent LAC/PAA with traditional water treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Use XJ river water as raw water to configure Pb(II) polluted water, pH=7.6, Pb(II) concentration is 51μg / L, add 25mg / L LAC / PAA after 20 minutes of adsorption, 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: For a Pb(II) polluted water sample, pH=8.5, Pb(II) concentration is 46μg / L, after adding 22mg / L LAC / PAA for 20 minutes of adsorption, the effluent Pb(II) concentration is 7.6μg / L, which meets the requirements of the WHO water quality standard.

Embodiment 3

[0060] Example 3: A water sample polluted by Pb(II), pH=4.6, Pb(II) concentration is 35μg / L, the pH is adjusted to 8.0, and 20mg / L of LAC / PAA is added to absorb for 20 minutes, the water is discharged 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) by combining a heavy metal absorbent LAC / PAA with a traditional water treatment process. A low-cost heavy metal removal absorbent (LAC / PAA) is prepared, and compared with activated carbon for a common water purification plant (pH= 6-10), the surface acidic groups of LAC / PAA are increased (pH= 4.8), so that the function of absorbing and removing heavy metals is fulfilled. Aiming at raw water polluted by Pb(II), the water quality of raw water polluted by Pb (II) is analyzed firstly. If Pb (II) is less than or equal to 50 mug / L, LAC / PAA adsorption is used directly to meet the requirements of WHO water quality standard. If 50 mu g / L (Pb (II) is less than 300 mu g / L, the heavy metal absorbent LAC / PAA needs to be combinedwith with the traditional water process; the adsorbent is used for water treatment, so that actual factors of water plant running can be fully considered, emergency feeding is facilitated, and purposes of solving low-concentration heavy metal emergency pollution and saving resources are achieved.

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) in combination with a low-cost heavy metal-removing absorbent LAC / PAA and a traditional water treatment process. Background technique [0002] However, there are few reports on the emergency treatment of heavy metal lead (Pb(II)) pollution in drinking water [18] . Although chemical precipitation technology has been identified as an emergency method for the removal of heavy metals from water [16] , but according to the drinking water quality guidelines of the World Health Organization, 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) pollution, which is not only efficient, easy to operat...

Claims

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Application Information

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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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