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A treatment method for removing high-concentration nickel-containing electroplating wastewater

A treatment method, nickel electroplating technology, applied in the treatment of high-concentration nickel-containing electroplating wastewater based on modified calcium silicate physical and chemical removal, and the treatment of high-concentration nickel-containing electroplating wastewater, which can solve the problem that traditional methods are difficult to meet the discharge standards , Heavy metals are not easy to recycle, and adsorbents are difficult to reuse, etc., to achieve the effects of shortening the processing time, high specific gravity, and fast sedimentation speed

Active Publication Date: 2017-02-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method has strong adaptability and low investment, but there are problems such as heavy metals are not easy to recycle and adsorbents are difficult to reuse
[0004] Since 2008, the country has issued the latest discharge standards for electroplating wastewater, especially for heavy metal nickel, and it is difficult to achieve standard discharge by traditional methods

Method used

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  • A treatment method for removing high-concentration nickel-containing electroplating wastewater
  • A treatment method for removing high-concentration nickel-containing electroplating wastewater
  • A treatment method for removing high-concentration nickel-containing electroplating wastewater

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Experimental program
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Effect test

Embodiment 1

[0028] The electroplating wastewater used contained high concentration of iron ions (1.8g / L) and lower concentrations of nickel ions (93.12mg / L) and phosphate ions (65.7mg / L). Enter the waste water (14) into the pretreatment mixing tank (5) of the pretreatment tank (1), add calcium hydroxide medicament, adjust the pH value to 9, mix and stir for 1 hour, and then enter the pretreatment sedimentation tank (6) to freely Settling, the supernatant enters in the first section comprehensive pool (2), and the sludge (15) enters the filter press and is discharged. In the first section mixing reaction tank (8), through the dosing device (7), add 0.5g / L modified calcium silicate with a particle diameter of 200nm, after mixing and stirring for 0.5h, enter the first section clarification tank ( 9) Perform inclined tube settling, the supernatant enters into the second comprehensive reaction tank (3), and the sludge (17) is discharged into the elution tank (4). In the second mixing reaction...

Embodiment 2

[0031]According to the analysis of the production process, electroplating wastewater contains high concentrations of nickel ions (6.9g / L), phosphate ions (30.5g / L) and lower concentrations of chromium ions (65.7mg / L), zinc ions (15.6mg / L) L). Enter the waste water (14) into the pretreatment mixing pool (5) of the pretreatment pool (1), add aqueduct cleaning water to dilute the waste water by 100 times, adjust the pH value to 9 with calcium hydroxide medicament, mix and stir for 1 hour, and enter The pretreatment sedimentation tank (6) settles freely, the supernatant enters the first section of comprehensive tank (2), and the sludge (15) enters the filter press and is discharged. Add 1g / L of modified calcium silicate with a particle size of 200nm in the first section of the mixing reaction tank (8) through the dosing device (7), mix and stir for 1 hour, and then enter the first section of the clarification tank (9) Settling in inclined tubes is carried out, the supernatant ent...

Embodiment 3

[0034] The electroplating wastewater used contained high concentrations of nickel ions (228.17mg / L), phosphate ions (233.33mg / L) and low concentrations of chromium ions (65.7mg / L).

[0035] Process A: enter the waste water (14) into the pretreatment mixing tank (5) of the pretreatment tank (1), adjust the pH value to 9 with calcium hydroxide medicament, mix and stir for 1 hour, and then enter the pretreatment sedimentation tank (6 ) to settle freely, the supernatant enters the first section of comprehensive pool (2), and the sludge (15) enters the filter press and is discharged. Add 1g / L modified calcium silicate through the dosing device (7) in the first mixing reaction tank (8), mix and stir for 1 hour, then enter the first clarification tank (9) for inclined tube sedimentation , the supernatant enters the second section of the comprehensive reaction tank (3), and the sludge (17) is discharged into the elution tank (4). In the second section mixing reaction tank (10), throu...

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Abstract

The invention discloses a treatment method for removing high-concentration nickel-containing electroplating wastewater, and belongs to the fields of environmental engineering and wastewater treatment. High-concentration nickel-phosphorus in the electroplating wastewater is removed by using adsorbent modified calcium silicate and combining with a two-stage method, and a complexing agent does not need to be destroyed during the period, so that the cost is effectively reduced, and the treatment time is shortened; the sedimentation rate of heavy metal ions is high, and the treatment efficiency is relatively high; and the recycling treatment of an adsorbent is achieved by processed sludge through a desorption process. Compared with a similar method for processing electroplating wastewater, the treatment method disclosed by the invention can be used for effectively removing the high-concentration nickel-containing electroplating wastewater so as to reduce the operation cost.

Description

technical field [0001] The invention relates to a treatment method for removing high-concentration nickel-containing electroplating wastewater, in particular to a treatment method for removing high-concentration nickel-containing electroplating wastewater based on modified calcium silicate physicochemistry, and belongs to the field of environmental engineering and wastewater treatment. Background technique [0002] Electroplating is one of the basic processes of the manufacturing industry, which has greatly promoted the development of my country's economy and society. However, along with benefiting mankind, a large amount of electroplating wastewater, such as plating piece cleaning wastewater, waste bath liquid, equipment cooling liquid, and waste plating liquid, is also produced during the electroplating production process. Among them, the treatment of heavy metals is the top priority of industrial wastewater. Heavy. Nickel is the most common allergenic metal, and if it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/281C02F1/52C02F9/00C02F2103/16
Inventor 严群田延威
Owner JIANGNAN UNIV