Method for treating nickel-containing wastewater by using composite adsorbent

A composite adsorption, nickel wastewater technology, applied in adsorption water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of complex operation process and low removal rate of nickel metal.

Active Publication Date: 2020-05-19
ANHUI DEQI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods for treating nickel-containing wastewater, including chemical methods, electrolysis methods, and physical isolation and filtration methods, the existing treatment methods generally have the defects of complicated operation process and low removal rate of nickel metal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for treating nickel-containing wastewater by using a composite adsorbent, comprising the following steps:

[0025] S1. Mix the nickel-containing wastewater with the composite adsorbent, vibrate at room temperature, and obtain primary treated wastewater after solid-liquid separation;

[0026] S2. Adjust the pH value of the primary treatment wastewater to 5, add sodium hypochlorite for stirring reaction, then add a composite adsorbent to vibrate at room temperature, and obtain secondary treatment wastewater after solid-liquid separation;

[0027] S3, adjust the pH value of the secondary treatment wastewater to 10.5, let it stand for precipitation, take the upper liquid and add polyaluminum chloride to stir, then add polyacrylamide to stir, stand still, and obtain the third treatment wastewater after solid-liquid separation;

[0028] S4, mixing the wastewater treated three times with the composite adsorbent, and separating the solid and liquid after shaking at roo...

Embodiment 2

[0031] A method for treating nickel-containing wastewater by using a composite adsorbent, comprising the following steps:

[0032] S1. Mix the nickel-containing wastewater with the composite adsorbent, vibrate at room temperature for 10 hours, and obtain primary treated wastewater after solid-liquid separation; wherein, each liter of nickel-containing wastewater is mixed with 11g of the composite adsorbent;

[0033] S2, adjust the pH value of the primary treatment wastewater to 4, add sodium hypochlorite to carry out stirring reaction, then add composite adsorbent and shake at room temperature for 18 hours, obtain secondary treatment wastewater after solid-liquid separation; The quality of sodium hypochlorite is 120mg, and 3g of composite adsorbent is added in every liter of treated wastewater;

[0034] S3. Add sodium hydroxide to adjust the pH value of the secondary treatment wastewater to 11.5, let it stand for precipitation, take the upper liquid and add polyaluminum chlori...

Embodiment 3

[0038] A method for treating nickel-containing wastewater by using a composite adsorbent, comprising the following steps:

[0039] S1. Mix the nickel-containing wastewater with the composite adsorbent according to the amount of nickel-containing wastewater mixed with 8 g of composite adsorbent per liter, shake at room temperature for 20 hours, and obtain primary treated wastewater after solid-liquid separation;

[0040] S2, adjust the pH value of the primary treatment wastewater to 4, add sodium hypochlorite to carry out the stirring reaction, then add the composite adsorbent and shake at room temperature for 20 hours, and obtain the secondary treatment wastewater after solid-liquid separation; wherein, every liter of primary treatment wastewater added The quality of sodium hypochlorite is 150mg, and 6g composite adsorbent is added in every liter of once-treated wastewater;

[0041] S3. Add sodium hydroxide to adjust the pH value of the secondary treatment wastewater to 11, le...

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PUM

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Abstract

The invention discloses a method for treating nickel-containing wastewater by using a composite adsorbent. The method comprises the following steps: mixing the nickel-containing wastewater with the composite adsorbent, carrying out oscillating at room temperature, carrying out solid-liquid separation to obtain preliminarily-treated wastewater, adjusting the pH value of the preliminarily-treated wastewater to 4-5, adding sodium hypochlorite, carrying out a stirring reaction, adding the composite adsorbent, conducting oscillating at room temperature, and carrying out solid-liquid separation to obtain secondarily-treated wastewater; adjusting the pH value of the secondarily-treated wastewater to 10.5-11.5, performing standing for precipitation, taking supernatant liquid, adding polyaluminum chloride, conducting stirring, adding polyacrylamide, performing stirring and standing, and carrying out solid-liquid separation to obtain tertiarily-treated wastewater; and mixing the tertiarily-treated wastewater with the composite adsorbent, conducting oscillating at room temperature, and carrying out solid-liquid separation, wherein the composite adsorbent is prepared by uniformly mixing modified sepiolite, acid-modified fly ash and cross-linked chitosan. The method for treating the nickel-containing wastewater by using the composite adsorbent provided by the invention is simple in process,has a better treatment effect on various forms of nickel in a water body, and is high in nickel removal rate.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating nickel-containing wastewater by using a composite adsorbent. Background technique [0002] Nickel is one of the most widely used and expensive heavy metal elements. In recent years, it has been widely used in electroplating, electronics, alloys, steel, catalysts and other fields. These fields will discharge a large amount of nickel-containing wastewater. Nickel and its compounds in nickel-containing wastewater are highly toxic substances. In the field of wastewater treatment, nickel-containing wastewater is a high-concentration and refractory toxic wastewater. If it is not treated properly, it will not only waste nickel metal resources, but also It is easy to produce secondary pollution, and can enter the human body through the food chain, causing serious harm to the human body. Therefore, according to the regulations of the environmental protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28B01J20/24B01J20/30C02F101/20
CPCC02F9/00C02F1/281C02F1/288C02F1/286B01J20/24B01J20/12B01J20/103B01J20/22C02F1/66C02F1/5236C02F1/56C02F2101/20C02F2301/08C02F1/76
Inventor 林森
Owner ANHUI DEQI ENVIRONMENTAL PROTECTION TECH CO LTD
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