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Method for removing heavy metallic salts from industrial waste water by using egg shells

A technology for industrial wastewater and heavy metal salts, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as poor impact resistance to running water and easy loss, unresolved metal recovery methods, difficult desorption of adsorbed metals, etc. , to achieve the effect of low cost, good natural settlement and excellent effect

Inactive Publication Date: 2009-09-23
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the defects of this kind of material selected are very prominent: the source is unique and difficult to obtain, resulting in high cost of use, or it is easy to generate too much silt, or the impact resistance of flowing water is poor and easy to lose, or the adsorbed metal is not easy to desorb, or Unresolved metal recovery methods, or require complex pre-treatment, or cannot be recycled

Method used

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  • Method for removing heavy metallic salts from industrial waste water by using egg shells
  • Method for removing heavy metallic salts from industrial waste water by using egg shells
  • Method for removing heavy metallic salts from industrial waste water by using egg shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1. eggshell preparation consumption is to Cu 2+ Remove the effect of the effect

[0024] 100mL of heavy metal salt solution (initial Cu 2+ Concentration is 100mg / L, solution initial pH 5) is placed in the Erlenmeyer flask of 250mL, adds a certain amount of eggshell preparation (referring to figure 1 ), 32°C, 200rpm shaker adsorption for 2 hours. Pour the adsorbed solution into a centrifuge tube, centrifuge at 4800rpm for 5 minutes, and take the supernatant. The standard method of Perkin-Elmer Company is used for determination by atomic absorption instrument.

[0025] The reference standard is "National Standard Sewage Comprehensive Discharge Standard of the People's Republic of China" (GB8978-1996). The discharge standards for total cadmium, total copper and total zinc are shown in Table 1 below.

[0026] Table 1 Total Cadmium, Total Copper and Total Zinc Discharge Standards (GB8978-1996) (Note: There is no total Fe discharge standard in this standard) ...

Embodiment 2

[0029] Embodiment 2. heavy metal salt solution initial Cu 2+ Concentration vs. Cu 2+ Remove the effect of the effect

[0030] 100mL of heavy metal salt solution (its initial Cu 2+ Concentration see figure 2 , the initial pH of the solution was 5) placed in a 250mL Erlenmeyer flask, added 1g / 100ml eggshell preparation, and adsorbed on a shaker at 200rpm at 32°C for 2 hours. Pour the adsorbed solution into a centrifuge tube, centrifuge at 4800rpm for 5 minutes, and take the supernatant. The standard method of Perkin-Elmer Company is used for determination by atomic absorption instrument. The reference standard is the same as Table 1.

[0031] It was found that with the initial Cu 2+ As the concentration increased, the removal efficiency decreased significantly. The removal of natural eggshell materials does not meet the national emission standards for copper. Only the pretreated eggshell material in the initial Cu 2+ When the concentration is 100mg / L, the removal effec...

Embodiment 3

[0032] Example 3. Adsorption time on Cu 2+ Remove the effect of the effect

[0033] 100mL of heavy metal salt solution (initial Cu 2+ The concentration is 100mg / L, the initial pH of the solution is 5) placed in a 250mL Erlenmeyer flask, add 1g / 100ml eggshell preparation, 32°C, 200rpm shaker adsorption for a period of time (see image 3 ). Pour the adsorbed solution into a centrifuge tube, centrifuge at 4800rpm for 5 minutes, and take the supernatant. The standard method of Perkin-Elmer Company is used for determination by atomic absorption instrument. The reference standard is the same as Table 1.

[0034] It was found that natural eggshell materials had little removal effect even with prolonged adsorption time. The pretreatment eggshell material is adsorbed for 105 minutes, and the removal effect reaches the national third-level emission standard for copper, and the adsorption is 120 minutes, and the removal effect reaches the national second-level emission standard for ...

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Abstract

The invention provides a method for removing heavy metallic salts in industrial waste water by using egg shells. The method comprises the following steps of: adjusting the pH value of the industrial waste water to 3 to 5; and adding more than 0.8g / 100ml of egg shells to the industrial waste water to make the egg shells adsorb the industrial waste water at a temperature of between 15 and 40 DEG C for more than 105m. The method can effectively remove the heavy metal ions in the industrial waste water, so that the method can be widely used for treating various kinds of industrial waste water containing the heavy metallic salts.

Description

Background technique [0001] Heavy metals are elements that make up the earth's crust, mostly exist in various minerals, and their content is generally less than 0.1% (Cong Yanguo and Wei Lihua, 2002), which belong to trace elements. Some heavy metals can participate in some special growth and metabolism activities of organisms at a certain (trace) level or in a certain ion valence state (Chen Suhua et al., 2002). In this case these heavy metal ions are indispensable for the growth and metabolism of organisms. From the perspective of bioavailability, heavy metals cannot be degraded and completely disappear from the environment (An et al., 2001). They can only be transformed from one form to another, from high concentration to low concentration, and some of them can be in toxicity- It can transform between non-toxic and low-toxic states, and can accumulate and enrich in organisms (Xia Lijiang et al., 1998). [0002] Heavy metal copper (Cu) is one of the elements that constitut...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62C02F101/20
Inventor 李有志唐纪良马庆生刘杨
Owner GUANGXI UNIV
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