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Method for treating nickel-containing wastewater of aluminum profile surface treatment

A technology of surface treatment and treatment method, which is applied in the field of treatment of nickel-containing wastewater on the surface of aluminum profiles, can solve the problems of easy deterioration, low treatment efficiency, and failure, and achieve the effect of accelerating co-precipitation, simple treatment steps, and simple steps

Inactive Publication Date: 2019-09-10
GUANGDONG FENGLU ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optimum reaction temperature is 30-50°C, not more than 60°C. However, because the wastewater discharge temperature is different in different seasons and production, it must be equipped with aging cooling, adding cooling or heating equipment to control the temperature range of the wastewater in the matter. This increases the difficulty and investment of wastewater treatment; in addition, when there are organic substances in the water body, the addition ratio of hydrogen peroxide and ferrous sulfate must be adjusted to achieve a better treatment effect. The treatment time of this method is generally 2-3 hours, low processing efficiency
This method generally needs to add excess hydrogen peroxide, and hydrogen peroxide remains in the treated water, resulting in secondary pollution
The ferrous sulfate hydrogen peroxide used in this method must have good storage conditions, which is prone to deterioration, failure, and high storage costs.

Method used

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  • Method for treating nickel-containing wastewater of aluminum profile surface treatment
  • Method for treating nickel-containing wastewater of aluminum profile surface treatment

Examples

Experimental program
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Effect test

preparation example Construction

[0020] (1) preparation of sodium aluminate lye;

[0021] Specifically: add sodium hydroxide and aluminum-containing liquid or solid into water, stir well and evenly to obtain sodium aluminate lye; in addition, it can also be: waste liquid obtained by treating aluminum profile molds with sodium hydroxide solution, or The bath solution of aluminum-containing alkali tank obtained by surface oxidation treatment of aluminum profiles is collectively referred to as sodium aluminate lye. When sodium aluminate lye is added, sodium aluminate lye can adjust the pH of acidic nickel-containing wastewater not to be low. In 11, the sodium aluminate lye was prepared according to the nickel content in the nickel-containing wastewater, that is, the sodium aluminate lye was prepared according to the content ratio of nickel: aluminum 1:50-60 mg, which was used as the basis for measurement, and according to the actual treatment The total amount of nickel in the nickel-containing wastewater detecte...

Embodiment 1

[0028] A method for treating nickel-containing wastewater on the surface of aluminum profiles comprises the following steps:

[0029] (1) Preparation of sodium aluminate lye; add sodium hydroxide and aluminum-containing liquid or solid to water, and fully stir to obtain sodium aluminate lye;

[0030] (2) Detect that the pH value of the nickel-containing wastewater is 2.0 to 2.5, add the above-mentioned sodium aluminate lye to the nickel-containing wastewater, stir evenly, when the sodium aluminate lye adjusts the pH of the acidic nickel-containing wastewater to 11 , prepare sodium aluminate lye according to the nickel content in nickel-containing wastewater, that is, prepare sodium aluminate lye according to the ratio of nickel: aluminum 1:50 (mg); put the monitoring probe of the online PH device into the nickel-containing In the waste water, by setting the pH value in the range of 6.5 to 8.0, and displaying the pH value number on the meter on the electric control cabinet, aut...

Embodiment 2

[0032] (1) Preparation of sodium aluminate lye; collect the waste liquid obtained by treating the aluminum profile mold with sodium hydroxide solution to obtain sodium aluminate lye;

[0033] (2) Detect that the pH value of nickel-containing waste water is 3.5, add above-mentioned sodium aluminate lye in nickel-containing waste water, stir, when sodium aluminate lye adjusts the pH of acidic nickel-containing waste water to 13.5, according to The nickel content in the nickel-containing wastewater is used to prepare sodium aluminate lye, that is, to prepare sodium aluminate lye according to the ratio of nickel: aluminum 1:60 (mg); put the monitoring probe of the online PH device into the nickel-containing wastewater , by setting the PH value in the range of 6.5 to 8.0, and displaying the PH value number on the meter on the electric control cabinet, automatic regulation is performed. When the PH value is higher than 8.0, the metering pump is automatically turned on and hydrochlori...

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Abstract

The invention discloses a method for treating nickel-containing wastewater of aluminum profile surface treatment. Through adding a sodium aluminate alkaline solution into the nickel-containing wastewater, and monitoring and regulating the pH value of an online pH device in a range of 6.5-8.0, and through adding an anionic polyacrylamide flocculant for co-precipitation, the nickel concentration ofthe wastewater decreases from 63 mg / L to 0.07 mg / L or below, other metal elements are reduced in a synergistic manner, the hexavalent chromium concentration of the wastewater decreases from 2.9 mg / L to 0.004 mg / L or below, and the concentration of high-concentration aluminum ions of the wastewater decreases to 0.15 mg / L or below so that the nickel-containing wastewater after treatment reaches thesewage discharge standard. The method avoids use of an oxidant and a reducing agent, and has simple treatment steps and a low cost.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment, in particular to a method for treating nickel-containing wastewater on the surface of an aluminum profile. Background technique [0002] The surface treatment of aluminum profile processing consumes a lot of water and produces a lot of waste water. The harmful substances contained in the waste water are continuously discharged. If they are not treated, they will seriously affect the pollution of the environment. In addition, nickel-containing industrial wastewater and domestic sewage are generally treated by the Fenton method. The modified method is characterized by adjusting the treated water to an acidic pH between 3-5, adding hydrogen peroxide and ferrous sulfate, and reacting to form peroxyl, Hydroxyl free radicals free the complexed nickel; add caustic soda, adjust the treated water to be alkaline, and form nickel hydroxide precipitation, and add polyaluminum chloride at the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/52C02F1/56C02F101/20C02F101/22
CPCC02F1/5245C02F1/56C02F1/66C02F2101/20C02F2101/22
Inventor 陆承煌鲁炎卿
Owner GUANGDONG FENGLU ALUMINUM