A kind of adsorbent for heavy metal wastewater treatment and heavy metal wastewater treatment method

A waste water treatment and adsorbent technology, which is applied in the field of heavy metals, can solve the problems of difficult to meet the reuse requirements of treated water, low regeneration efficiency of activated carbon, and expensive adsorbent, etc., and achieve excellent purification effect, rapid adsorption process, and low price.

Active Publication Date: 2015-10-28
深圳市兆凯生物工程研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorbents currently used in industry are expensive, and their wide application is limited. The recovery of heavy metals, regeneration of adsorbents and secondary pollution are also difficulties in the treatment of heavy metal wastewater by adsorption.
The commonly used adsorbent activated carbon is widely used in wastewater treatment, but the regeneration efficiency of activated carbon is low, and the treated water quality is difficult to meet the reuse requirements. Generally, it is only used for the pretreatment of electroplating wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for an adsorbent for heavy metal wastewater treatment, carried out according to the following steps:

[0029] 1. Collect artificially cultured diatoms, add hydrogen peroxide to the diatoms, and stir for 10 minutes

[0030] 2. Add fresh water to the diatoms obtained in step 1 for dilution, and let stand for 4 hours;

[0031] 3. After the treatment in step 2, the diatom solution will be layered, discard the upper solution, and keep the bottom sediment;

[0032] 4. Repeat step 1 and step 2 until the bottom sediment turns off-white;

[0033] 5. Collect the sediment at the bottom, add a certain amount of HCl to wash away the heavy metal ions that may be contained in the algae frustule, add NaOH to neutralize after washing with pure water, and dry it to become the diatom frustule adsorbent;

[0034] 6. Add diatom frustule adsorbent to the heavy metal solution, stir or shake for 10 minutes;

[0035] 7. Centrifuge the diatom frustule adsorbent or let it ...

Embodiment 2

[0040] A preparation method for an adsorbent for heavy metal wastewater treatment, carried out according to the following steps:

[0041] 1. Collect artificially cultured diatoms, add bleach to the diatoms, and stir for 15 minutes

[0042] 2. Add fresh water to the diatoms obtained in step 1 for dilution, and let stand for 5 hours;

[0043] 3. After the treatment in step 2, the diatom solution will be layered, discard the upper solution, and keep the bottom sediment;

[0044] 4. Repeat step 1 and step 2 until the bottom sediment turns off-white;

[0045] 5. Collect the sediment at the bottom, add a certain amount of HCl to wash away the heavy metal ions that may be contained in the algae frustule, add NaOH to neutralize after washing with pure water, and dry it to become the diatom frustule adsorbent;

[0046] 6. Add diatom frustule adsorbent to the heavy metal solution, stir or shake for 10 minutes;

[0047] 7. Centrifuge the diatom frustule adsorbent or let it stand until...

Embodiment 3

[0052] A preparation method for an adsorbent for heavy metal wastewater treatment, carried out according to the following steps:

[0053] 1. Collect artificially cultured diatoms, add bleach to the diatoms, and stir for 15 minutes

[0054] 2. Add fresh water to the diatoms obtained in step 1 for dilution, and let stand for 6 hours;

[0055] 3. After the treatment in step 2, the diatom solution will be layered, discard the upper solution, and keep the bottom sediment;

[0056] 4. Repeat step 1 and step 2 until the bottom sediment turns off-white;

[0057] 5. Collect the sediment at the bottom, add a certain amount of HCl to wash away the heavy metal ions that may be contained in the algae frustule, add NaOH to neutralize after washing with pure water, and dry it to become the diatom frustule adsorbent;

[0058] 6. Add diatom frustule adsorbent to the heavy metal solution, stir or shake for 5 minutes;

[0059] 7. Centrifuge the diatom frustule adsorbent or let it stand until ...

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Abstract

The invention provides an adsorbent for processing heavy metal wastewater and a heavy metal wastewater processing method. The heavy metal wastewater processing method comprises the following steps of step A'. adding a diatom shell adsorbent into a heavy metal solution, uniformly stirring and mixing or vibrating; step B'. carrying out centrifugal separation on the diatom shell adsorbent or precipitating the to-be-standing diatom shell adsorbent, and eliminating upper clear solution; step C'. adding the processed diatom shell adsorbent after processing into a HCl solution, stirring uniformly so as to fully elute heavy metal ions, and recycling the heavy metal by using an eluant; and step D'. adding the processed diatom shell into a NaOH solution, and neutralizing an activating diatom shell adsorbent to enable the final PH range of the solution to be 7-7.5. Compared with the prior art, the adsorbent and the heavy metal wastewater processing method provided by the invention have the obvious advantages that the processing cost is low, the technology is simple, the secondary pollution does not exist, the adsorbent can be reused for multiple times, and the heavy metal is easy to recycle; meanwhile, the capability of the processing low concentration heavy metal wastewater on the diatom shell heavy metal adsorbent is strong.

Description

technical field [0001] The invention relates to a preparation method of a reproducible novel heavy metal adsorbent, in particular to a method capable of removing and recovering heavy metals in heavy metal wastewater. Background technique [0002] At present, there are three main types of heavy metal wastewater treatment methods: chemical reaction removal method, adsorption concentration separation removal method, and microbial or plant removal method. The first category is the removal of heavy metal ions in wastewater through chemical reactions, including neutralization precipitation, sulfide precipitation, ferrite co-precipitation, chemical reduction, electrochemical reduction, and polymer heavy metal collectors; The second category is the method of adsorption, concentration and separation of heavy metals in wastewater without changing their chemical form, including adsorption, solvent extraction, evaporation and coagulation, ion exchange and membrane separation, etc.; the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/62
Inventor 王兆凯张江涛秦捷何智慧
Owner 深圳市兆凯生物工程研发中心有限公司
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