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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  • 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 proce

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

Example Embodiment

[0017] Example 1

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

[0019] 1. Processing of pomelo peel powder: wash the discarded pomelo peel with clean water and remove the bluish-yellow epidermis of the outermost layer, and cut into 1cm after air-drying at room temperature 2 Wash the small pieces with distilled water for several times and then air-dry them at room temperature; then bake them at 65°C for 48 hours, pass through a 50-mesh sieve, and prepare pomelo peel powder with a particle size of less than 600μm, and place them in a desiccator for later use;

[0020] 2. Solution preparation: add CaCl 2 Dissolve in deionized water and stir to obtain CaCl with a mass concentration of 6% 2 Solution (ie embedding treatment solution); put sodium alginate and gelatin into deionized water, stir evenly at a temperature of 80 ℃ to prepare a mixed gel solution of sodium alginate and gelatin, wherein the mass concentration of sodium al...

Example Embodiment

[0025] Example 2

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

[0027] Table 1: Biomass adsorbent's effect on Pb under different pH conditions 2+ Removal effect

[0028] pH value

[0029] Pb 2+ The adsorption rate is calculated according to the following formula (the same below):

[0030] R ...

Example Embodiment

[0033] Example 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 Pb-containing 2+ The wastewater was placed in a 250mL Erlenmeyer flask, the pH of the wastewater was adjusted to 5.5, 0.015g of biomass adsorbent was added to it, and the temperature was shaken on a constant temperature shaker at 30°C for 4h (oscillation rate 150r·min -1 ). Sampling after the adsorption treatment is completed, the sample is subjected to 4500r·min -1 Centrifuge for 10 minutes, the lower layer is Pb adsorbed 2+ The biomass adsorbent. Use 3510 atomic absorption spectrophotometer to measure Pb in supernatant 2+ Concentration, the results are shown in Table 2 below:

[0035] Table 2: Pb content of biomass adsorbents at different initial concentrations 2+ Pb in wastewater 2+ Removal effect

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

[0037] It can be seen from Table 2 above that the initial con...

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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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