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A method for removing heavy metal ions in waste water

A technology of heavy metal ions and heavy metals, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as soil environment, river environment, groundwater environmental hazards, etc., achieve reduction of heavy metal discharge, obvious economy Effects of benefits and environmental benefits

Active Publication Date: 2017-04-12
太仓中化环保化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of a large amount of nickel-containing wastewater or in key water source areas, a large amount of nickel will still be discharged into the environment, causing potential harm to the soil environment, river environment, and groundwater environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for removing heavy metal ions in waste water, the waste water comes from electroplating enterprises containing heavy metal nickel ion waste water, the weight of heavy metal nickel ion waste water is 205g, the total nickel in the waste water is 500.25 mg / l, and the mass content of hydrogen fluoride is 15%. The specific removal methods include The following steps:

[0030] (1) Add 0.93g of sodium sulfite to wastewater containing heavy metal nickel ions, stir for 8 minutes, and the reaction temperature is 50°C;

[0031] (2) Add sodium hydroxide to the wastewater treated in step (1), stir for 10 min, and adjust the pH value of the wastewater to 8.2;

[0032] (3) Add 0.06g of potassium borohydride to the wastewater treated in step (2), stir and react for 10min, and the reaction temperature is 53°C;

[0033] (4) Add 0.005 g of polyacrylamide to the wastewater treated in step (3), stir for 8 minutes, and then filter it with a filter press to obtain a filtrate with a ...

Embodiment 2

[0035] A method for removing heavy metal ions in waste water, the waste water comes from electroplating enterprises containing heavy metal nickel ion waste water, the weight of heavy metal nickel ion waste water is 205g, the total nickel in the waste water is 500.25 mg / l, and the mass content of hydrogen fluoride is 15%. The specific removal methods include The following steps:

[0036] (1) Add 0.57g of sodium sulfite to the wastewater containing heavy metal nickel ions, stir for 2 minutes, and the reaction temperature is 50°C;

[0037] (2) Add calcium hydroxide to the wastewater treated in step (1), stir for 5 minutes, and adjust the pH value of the wastewater to 8.1;

[0038] (3) Add 0.04 g of potassium borohydride to the wastewater treated in step (2), stir and react for 5 minutes, and the reaction temperature is 49°C;

[0039] (4) Add 0.005g of polyacrylamide to the wastewater treated in step (3), stir for 10min, and then filter it with a filter press to obtain a filtrate...

Embodiment 3

[0041] A method for removing heavy metal ions in wastewater. The wastewater comes from electroplating enterprises containing heavy metal nickel ions. The weight of the wastewater containing heavy metal nickel ions is 205g. The total nickel in the wastewater is 500.25mg / l, and the mass content of hydrogen fluoride is 15%. The specific removal method Include the following steps:

[0042] (1) Add 0.93g of sodium sulfite to wastewater containing heavy metal nickel ions, stir and react for 20min, and the reaction temperature is 50°C;

[0043] (2) Add calcium hydroxide to the wastewater treated in step (1), stir for 10 min, and adjust the pH value of the wastewater to 8.9;

[0044] (3) Add 0.03 g of potassium borohydride to the wastewater treated in step (2), stir and react for 5 minutes, and the reaction temperature is 58°C;

[0045] (4) Add 0.005g of polyacrylamide to the wastewater treated in step (3), stir for 8 minutes, and then filter it with a filter press to obtain a filtra...

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PUM

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Abstract

The invention relates to a method for removing heavy metal ions in wastewater. According to the method, after heavy metal nickel ion-containing wastewater coming from electroplating enterprises is treated, the content of total nickel in the wastewater is lower than 0.007 mg / l, the treatment method comprises combinations of reduction, neutralization, flocculation, precipitation, press-filtering and the like, and the treated wastewater can meet requirements that the total nickel is less than 0.05 mg / l in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) and even far less than the standard that the content of the total nickel is lower than 0.02 mg / l in the tap water drinking water standard. With the adoption of the method, the content of total nickel in the nickel-containing wastewater of the electroplating enterprises and aluminum profile processing enterprises can be reduced, heavy metal discharge can be reduced, and compared with traditional technologies, the method has obvious economic benefit and environmental protection benefit.

Description

technical field [0001] The invention relates to a method for removing heavy metal ions in wastewater, in particular to a method for removing heavy metal nickel in wastewater produced by electroplating enterprises and aluminum profile processing enterprises. Background technique [0002] In the production of electroplating enterprises and aluminum profile processing enterprises, nickel salt solution is used to coat the metal surface to prevent rust. The electroplating waste liquid contains a large amount of nickel ions and hydrogen fluoride. After the wastewater is treated, the total nickel in the wastewater can meet the discharge standard required by the state, and the total nickel is ≤1.0mg / l. [0003] However, in the case of a large amount of nickel-containing wastewater or in key water source areas, a large amount of nickel will still be discharged into the environment, causing potential harm to the soil environment, river environment, and groundwater environment. Conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/62
Inventor 马腾飞顾善文何炳森张恒英黄金硕王童郑尧波田林沣
Owner 太仓中化环保化工有限公司