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Biosorbent removing lead ions in wastewater and preparation, application and regeneration methods thereof

A biomass adsorbent, lead ion technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of high operating costs, cumbersome operations, complex processes, etc. Good effect, simple equipment effect

Inactive Publication Date: 2009-12-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional lead removal methods mainly include chemical precipitation, electrolysis, ion exchange, membrane treatment and their mixed treatment methods, etc., but these methods have complex processes, cumbersome operations, high operating costs, and Defects such as secondary pollution are generated, and a simple and effective technology for treating lead-containing wastewater is urgently needed

Method used

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  • Biosorbent removing lead ions in wastewater and preparation, application and regeneration methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of biomass adsorbent of the present invention is specifically prepared through the following steps:

[0019] 1. Processing of pomelo peel powder: wash the discarded pomelo peel with water, remove the outermost bluish-yellow skin, air-dry at room temperature, cut into 1cm 2 For fragments of different sizes, wash them several times with distilled water and then air-dry them at room temperature; then dry them at 65°C for 48 hours, pass through a 50-mesh sieve to make pomelo peel powder with a particle size of less than 600 μm, and place them in a desiccator for use;

[0020] 2. Solution preparation: CaCl 2 Dissolved in deionized water and stirred evenly to obtain CaCl with a mass concentration of 6%. 2 solution (i.e. embedding treatment solution); put sodium alginate and gelatin into deionized water, and stir evenly at a temperature of 80°C to obtain a mixed glue solution of sodium alginate and gelatin, wherein the mass concentration of sodium alginate is 5%, the ...

Embodiment 2

[0026] Take 50mL Pb 2+ The concentration is 100mg·L -1 The lead-containing wastewater is placed in a 250mL Erlenmeyer flask, and the Pb-containing 2+ The pH value of the wastewater varies within the range of 1 to 7. Under different pH conditions, 0.015 g of biomass adsorbent is added each time and shaken at a constant temperature at 30 ° C for 4 h (oscillation rate 150 r min -1 ); After the adsorption treatment is completed, the sample is taken, and the sample is subjected to 4500r min-1 After centrifugation for 10 minutes, the lower layer is the biomass adsorbent that has adsorbed lead ions. Determination of Pb in supernatant with 3510 atomic absorption spectrophotometer 2+ Concentration, measurement result is shown in table 1:

[0027] Table 1: Biomass adsorbents on Pb at different pH values 2+ The removal effect of

[0028] pH value

1.8

2.5

3.5

4.5

5.5

6.5

Adsorption rate(%)

18.4

326

68.5

99.0...

Embodiment 3

[0034] Take 50mL Pb each 2+ The initial concentration is 50mg·L -1 , 70mg·L -1 , 90mg·L -1 , 110mg·L -1 , 130mg·L -1 , 150mg·L -1 , 200mg·L -1 containing Pb 2+ The wastewater was placed in 250mL Erlenmeyer flasks, the pH value of the wastewater was adjusted to 5.5, 0.015g of biomass adsorbent was added to it, and the shaker was shaken at a temperature of 30°C for 4h (oscillation rate 150r min -1 ). After the adsorption treatment is completed, the sample is taken, and the sample is subjected to 4500r·min -1 Centrifuge for 10 minutes, the lower layer is adsorbed Pb 2+ biomass adsorbent. Determination of Pb in supernatant with 3510 atomic absorption spectrophotometer 2+ concentration, the results are shown in Table 2 below:

[0035] Table 2: Biomass adsorbents containing Pb at different initial concentrations 2+ Pb in wastewater 2+ The removal effect of

[0036] Initial Pb 2+ Concentration (mg·L -1 )

[0037] It can be seen from the above table 2 that...

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Abstract

The invention discloses a biosorbent removing lead ions in wastewater and preparation, application and regeneration methods thereof, the biosorbent is granular and uses calcium alginate and gelatin as carriers in which grapefruit peel powder is embedded, mass ratio of the calcium alginate, the gelatin to the grapefruit peel powder is (8-10):(4-5):1, the biosorbent is prepared by using mixed glue of the calcium alginate and the gelatin to cover the grapefruit peel powder to result in a sorbent embedding body, instilling the sorbent embedding body into CaCl2 solution for curing and washing the body with de-ionized water, and implementing freeze drying. The biosorbent of the invention is added into wastewater for proceeding adsorption treatment for at least 30 minutes at normal temperature in which pH value is 3.5-7.0, which can basically remove lead ions in the wastewater. The biosorbent of the invention has the advantages of abundant sources of raw materials, low cost, high mechanical strength and excellent adsorption effect on the lead ions in the wastewater.

Description

technical field [0001] The invention relates to the treatment of waste water or sewage, in particular to a biomass adsorbent and its preparation, and also to a method for removing heavy metals in waste water by using the biomass adsorbent and a regeneration method for the biomass adsorbent. Background technique [0002] With the development of science and technology and the continuous improvement of human living standards, a large number of pollutants enter the water environment through different channels, causing serious deterioration of the quality of the aquatic ecological environment, among which the pollution of heavy metals is particularly serious. And lead in the heavy metal is a kind of serious environmental toxicity and neurotoxicity, all have poisonous effect to human body's nerve, blood, digestive, urinary, reproductive, immune and other systems, and the toxicity of lead has long-term and persistent, to its Governance has drawn great attention and attention from t...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 杨朝晖李璐曾光明石文军陈颖季丽丽
Owner HUNAN UNIV
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