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Method for cyclic treatment of heavy metal ion wastewater by utilizing modified fly ash

A technology for heavy metal ion and recycling treatment, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems affecting normal production, secondary pollution, low cost, etc., and achieve easy recycling and reuse , avoid secondary pollution, low price effect

Active Publication Date: 2014-06-25
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] (2) In order to achieve deep separation of characteristic elements in smelting wastewater, the amount of neutralizing agent (lime) used in the lime neutralization method is large, and the cost of process treatment is increasing day by day, gradually losing its advantages of simple process and low cost. During the process, about 25% of the impurities cannot be dissolved and are deposited in the pulping tank and pipeline, affecting normal production;
[0005] (3) The amount of waste slag obtained from the treatment is large, and the content of valuable metals (Zn, Cu, Ni, Co) in the slag is low, which is difficult to recycle and easily cause secondary pollution;
[0006] (4) Artificially adding excessive lime to wastewater, resulting in Ca in purified water 2＋ And the alkalinity rises, which brings difficulties to waste water recycling
[0007] Fly ash discarded from power plants can be used to treat heavy metal ion wastewater, which is a method of treating waste with waste. However, the adsorption capacity of unmodified fly ash is low, and it cannot be used directly to treat wastewater containing heavy metal ions. Discharge requirements for heavy metal ions in the Integrated Wastewater Discharge Standard (GB18918-2002)
[0008] The Chinese patent with the application number 200810204398.5 discloses a method for treating nickel-containing wastewater by using modified fly ash. The existing problems are: the modification process of fly ash is long, and the time for treating nickel metal ion wastewater is relatively long. Technical scheme of desorption and regeneration of modified fly ash after adsorption

Method used

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  • Method for cyclic treatment of heavy metal ion wastewater by utilizing modified fly ash
  • Method for cyclic treatment of heavy metal ion wastewater by utilizing modified fly ash
  • Method for cyclic treatment of heavy metal ion wastewater by utilizing modified fly ash

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Effect test

Embodiment 1

[0030] Treatment of Cu in wastewater before and after fly ash modification 2+ Ion contrast test.

[0031] Get the fly ash of Shanxi Power Plant to modify according to the method of the present invention, then measure the adsorption performance of the fly ash before and after modification to copper, zinc, cadmium ion wastewater, the results are shown in Table 1-3. It can be seen from Table 1-3 that the modified fly ash has several times higher adsorption capacity for heavy metal ions.

[0032] Table 1 Determination of the adsorption performance of fly ash on copper ion wastewater before and after modification

[0033]

[0034] Table 2 Determination of adsorption performance of fly ash to zinc ion wastewater before and after modification

[0035]

[0036] Table 3 Determination of adsorption performance of fly ash to cadmium ion wastewater before and after modification

[0037]

Embodiment 2

[0039] Circular Treatment of High Concentration Cu with Modified Fly Ash 2+ Wastewater Test 1.

[0040] Take 5g of modified fly ash and put it into 2.5l containing Cu 2+ Wastewater (Cu 2+ content of 800mg / l), stirred at room temperature for 1-3h, precipitated and separated; then put the precipitated isolate into 50ml regeneration solution (5% concentration of sodium hexametaphosphate + ammonium chloride solution), at 20-80℃ Then regenerate for 1-3 hours, then filter, wash and dry; the test results of 10 such cycles are shown in Table 4.

[0041] Copper ions in the regeneration solution can be enriched to more than 6.7g / l, which facilitates the next step of copper recovery; after more than 6 cycles, the copper content in the regeneration solution is basically maintained at 10.6g / l, which is mainly due to the fact that after 6 cycles , the copper content of zeolite is close to saturation.

[0042] Table 4 Determination of the circulation adsorption performance of modified fl...

Embodiment 3

[0045] Deep purification of low concentration Cu by modified fly ash 2+ Wastewater Test 2.

[0046] Take 5g of modified fly ash and put it into 2.5l containing Cu 2+ Wastewater (Cu 2+ content of 200mg / l), stir at room temperature for 1-3h, and precipitate and separate; then put the precipitated isolate into 10ml regeneration solution (5% concentration of sodium sulfate + ammonium chloride solution), and regenerate at 20-80°C 1-3h, and then filtered, washed and dried; the test results of 10 such cycles are shown in Table 5.

[0047] Cu in the treated wastewater 2+ The ion content is 0.05mg / l, and the removal rate is greater than 99%. Recycling meets the emission requirements for copper ions (<0.5mg / l) in the national "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).

[0048] Table 5 Determination of the deep purification of copper ion wastewater by modified fly ash

[0049] cycle adsorption

[0050] 7th time

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Abstract

The invention relates to a method for recycling heavy metal ions in wastewater and recycling resources. The method provided by the invention has the advantages of using waste to treat waste, comprehensively utilizing fly ash resources, realizing strong raw material applicability, low production cost and deep purification of heavy metal ion wastewater, effectively recovering the heavy metal ions and an adsorbent, achieving a recycling effect, significantly reducing the emission of production wastewater and being conductive to environmental protection.

Description

technical field [0001] The invention relates to the technical field of heavy metal ion wastewater treatment, in particular to a method for recycling wastewater using modified fly ash. Background technique [0002] Most of the heavy metal wastewater discharged from non-ferrous metal industrial enterprises in my country is treated by the traditional lime neutralization method. The enterprise has been in operation for many years. Under the condition that the impact load of sewage discharge is not large, the smelting wastewater undergoes processes such as homogenization, mixing, neutralization and precipitation. After treatment, the content of heavy metals (zinc, copper, nickel) in the effluent wastewater was effectively reduced, which can basically meet the requirements for the discharge of heavy metal wastewater. However, it has been found in practice that the lime neutralization precipitation method has the following disadvantages: [0003] (1) The level of metal ion content i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 冯爱玲王海北张邦胜赵磊蒋训雄汪胜东章俊王光辉刘三平王玉芳范艳青冯林永蒋伟张登高闫丽
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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