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Treatment method for wastewater containing heavy metal cations

A treatment method, cationic technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, high cost, unsuitable for large-scale application, etc., to achieve The effect of low reaction temperature, easy operation and low preparation cost

Active Publication Date: 2022-04-29
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a treatment method for wastewater containing heavy metal cations to solve the problems of high cost, high energy consumption and unsuitability for large-scale application of the prior art

Method used

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  • Treatment method for wastewater containing heavy metal cations
  • Treatment method for wastewater containing heavy metal cations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 0.1000g of reed powder with an acid value of 1.6mmol / g, 60-180 mesh, and add it to 25.00mL containing Cd 2+ 224.3mg / L of CdCl 2 In solution (pH=6.4), feeding ratio: acid group (0.16mmol): Cd 2+ (0.05mmol)=3.2:1. After shaking at 180r / min and 25℃ for 24h, after filtration, it was diluted 200 times and the remaining Cd was determined by atomic absorption flame spectrophotometry. 2+ The calculated adsorption amount was 2.4 mg / g reed, and the pH of the solution after adsorption was 6.21.

Embodiment 2

[0036] Put 200g of crushed 60-180 mesh reed powder into a 5L laboratory rotary furnace, and pour 200mL·min into the rotary furnace. -1 The oxygen was heated with three 300w infrared heating tubes evenly distributed outside the rotary furnace for about 30 minutes to 180 °C, and the temperature was kept constant for 4 hours to obtain 173 g of brown product (yield 87%), acid value 2.66 mmol / g, pH 4.20 Modified reed, such as figure 1 shown.

[0037] Weigh 0.1000g of the above modified reed powder, add it to 25.00mL containing Cd 2+ 224.3mg / L of CdCl 2 In solution (pH=6.4), feeding ratio: acid group (0.266mmol): Cd 2+ (0.05mmol)=5.3:1. After shaking at 180r / min and 25℃ for 24h, after filtration, it was diluted 200 times and the remaining Cd was determined by atomic absorption flame spectrophotometry. 2+ The calculated adsorption amount was 2.9 mg / g modified reed, which was 1.2 times that of Example 1, and the pH of the solution after adsorption was 5.31.

Embodiment 3

[0039] Weigh 0.10 g of modified reed powder with an acid value of 2.66 mmol / g and a 60-180 mesh (same as Example 2), add 0.15 mL of a mixture of 1 mol / L ammonia water and 2 mL of ethanol, and stir thoroughly to infiltrate the modified reed powder. The reed powder achieves the purpose of activation. After drying at 40°C, it is added to 25.00mL containing Cd 2+ 224.3mg / L of CdCl 2 In solution (pH=6.4), feeding ratio: acid group (0.266mmol): Cd 2+ (0.05mmol)=5.3:1. After shaking at 180r / min and 25℃ for 24h, after filtration, it was diluted 200 times and the remaining Cd was determined by atomic absorption flame spectrophotometry. 2+ The calculated adsorption amount was 13.8 mg / g modified reed, which was 4.76 times that of Example 2, and the pH of the solution after adsorption was 6.23.

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Abstract

The invention provides a treatment method for wastewater containing heavy metal cations, which uses modified straw with an acid value of 1.5-4.5mmol / g and a pH of less than 7 as an adsorbent, and after being activated by an alkaline activator, the wastewater pH Under the condition of 5~8, the heavy metal cations are adsorbed, and the adsorption capacity is significantly improved after alkali activation, which is dozens of times the adsorption capacity before modification. The invention has the advantages of low reaction temperature for straw modification, high yield, no tar generation, energy saving and environmental protection, simple process, easy operation, reduced energy consumption and cost, and is convenient for industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for wastewater containing heavy metal cations. Background technique [0002] Heavy metals are those with a density greater than 4.5 g / cm 3 There are 10 elements that are really classified as heavy metals: copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth. Heavy metal pollution in the environment mainly comes from industrial pollution, traffic pollution and domestic waste pollution. Heavy metal pollution in food mostly comes from plant or animal raw materials containing heavy metals, and secondly from food processing and storage. Studies have shown that heavy metals can generally enter the body through the digestive system and respiratory system. When the accumulation exceeds a certain limit, it will cause damage to human organs, nervous system, immune system and reproductive system, resulting in chronic poisoning; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/24C02F1/286C02F2101/20
Inventor 韩冰马志领刘微焦运红
Owner HEBEI UNIVERSITY
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