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Treatment method of nickel-containing wastewater

A treatment method and technology for nickel wastewater, applied in water/sewage treatment, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of poor treatment effect of complexed nickel, complex treatment process, and low nickel removal rate and other problems, to achieve the effect of concentrated effective pore size distribution, high specific surface area, and improved removal rate

Active Publication Date: 2020-05-22
ANHUI DEQI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A variety of nickel-containing wastewater treatment methods are disclosed in the prior art, but there are common defects such as complicated treatment process, poor treatment effect on complexed nickel, low nickel removal rate and poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A treatment method for nickel-containing waste water, comprising the following steps:

[0030] S1, nickel-containing waste water is added in the network-breaking tank, the pH value of the nickel-containing waste water in the network-breaking tank is adjusted to be 3, ferrous sulfate and hydrogen peroxide are added to carry out the Fenton oxidation reaction, the pH value is adjusted to 5.5, and sodium hypochlorite is added to stir and react. Add sodium metabisulfite to react, then add alkali to adjust the pH value to 11.5, and let it stand for precipitation;

[0031] S2. Put the waste liquid obtained after standing and settling S1 into the coagulation tank, add polyaluminum chloride to stir the reaction, then add it to the flocculation tank, add polyacrylamide to stir the reaction, then add it to the sedimentation tank for precipitation, and separate the solid and liquid to obtain Primary treatment of wastewater;

[0032] S3, adjust the pH value of the primary treatment...

Embodiment 2

[0034] A treatment method for nickel-containing waste water, comprising the following steps:

[0035] S1. Add nickel-containing waste water into the network-breaking tank, adjust the pH value of the nickel-containing wastewater in the network-breaking tank to 2, add ferrous sulfate and hydrogen peroxide for Fenton oxidation reaction for 25 minutes, adjust the pH value to 6.5, add sodium hypochlorite and stir for reaction , add sodium metabisulfite to react, then add sodium hydroxide to adjust the pH value to 11, and let it stand for precipitation for 40min; wherein, the addition amount of the ferrous sulfate is 5g / L; the ferrous sulfate and hydrogen peroxide in hydrogen peroxide The molar ratio of the sodium hypochlorite is 1:8; the quality of the added sodium hypochlorite is 0.08 times of the total nickel mass in the nickel-containing wastewater before treatment;

[0036] S2. Put the waste liquid obtained after standing and settling S1 into the coagulation tank, add polyalumi...

Embodiment 3

[0039] A treatment method for nickel-containing waste water, comprising the following steps:

[0040] S1. Add nickel-containing waste water into the network-breaking tank, adjust the pH value of the nickel-containing waste water in the network-breaking tank to 2.5, add ferrous sulfate and hydrogen peroxide for Fenton oxidation reaction for 40 minutes, adjust the pH value to 6, add sodium hypochlorite and stir for reaction , add sodium metabisulfite to react, then add sodium hydroxide to adjust the pH value to 10.5, and let it settle for 60 minutes; wherein, the quality of ferrous sulfate added in every liter of waste water is 7g, and the ferrous sulfate and hydrogen peroxide peroxidized The molar ratio of hydrogen is 1:7; the mass of sodium hypochlorite added is 0.2 times the mass of total nickel in nickel-containing wastewater before treatment;

[0041] S2. Put the waste liquid obtained after standing and settling S1 into the coagulation tank, add polyaluminum chloride to sti...

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Abstract

The invention discloses a treatment method of nickel-containing wastewater. The method comprises the following steps: adding nickel-containing wastewater into a complex breaking tank; adjusting the pHvalue to be 2 to 3; adding ferrous sulfate and hydrogen peroxide, and carrying out a Fenton oxidation reaction; adjusting the pH value to 5.5 to 6.5; adding sodium hypochlorite, stirring, carrying out a reaction, adding sodium metabisulfite, carrying out a reaction, then adding an alkali to adjust the pH value to 10.5-11.5, and carrying out standing precipitation; and adding the obtained waste liquid into a coagulating tank, adding polyaluminum chloride, carrying out a stirring reaction, then adding the mixture into a flocculation tank, adding polyacrylamide, carrying out a stirring reaction,adding the mixture into a sedimentation tank, precipitating, performing solid-liquid separation to obtain primarily treated wastewater, adjusting the pH value of the primarily treated wastewater to 6-7, then adding an adsorbent, adsorbing, performing solid-liquid separation after standing, detecting the content of the total nickel in the obtained liquid, and discharging after reaching the standard, wherein the adsorbent is a mixture of modified active carbon, silicon dioxide aerogel and montmorillonite in a weight ratio of (5-17):(1-4):(2-8).

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for nickel-containing wastewater. Background technique [0002] Nickel has high chemical stability, strong corrosion resistance, high thermal stability and excellent mechanical properties. With the rapid development of my country's economic technology and technology, the demand for nickel is increasing day by day. Electroplating, mining, metallurgy, machinery manufacturing, The amount of nickel-containing wastewater produced by petrochemical, textile, automobile, aircraft manufacturing, printing, ceramics, glass and other industries is also increasing. Nickel metal in nickel-containing wastewater is difficult to degrade and will be enriched through the food chain and eventually enter the human body, thus posing a serious threat to human health and leading to various diseases. Therefore, nickel-containing wastewater should be treated locally at the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28B01J20/22B01J20/30
CPCC02F9/00C02F1/281C02F1/283B01J20/20B01J20/12B01J20/10B01J20/22C02F1/288C02F1/285C02F1/66C02F1/52C02F1/725C02F1/76C02F1/5236C02F1/56
Inventor 林森
Owner ANHUI DEQI ENVIRONMENTAL PROTECTION TECH CO LTD