Method for removing nickel in chemical nickel-plating wastewater

A technology for nickel waste water and waste water, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as cumbersome operation and management, treatment compliance, and environmental protection pressure of enterprises, and achieve simple operation process, The effect of low pretreatment requirements and shortened work cycle

Inactive Publication Date: 2011-07-13
无锡市霄鹰环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, nickel chemical wastewater, that is, wastewater produced in electroless nickel plating, often contains complex nickel, and conventional methods are difficult to make it up to standard. The pollution problem has always been an urgent problem to be overcome in heavy metal wastewater treatment projects.
The total nickel in this kind of nickel-chemical wastewater is 20-50mg/L, because part of the nickel contained exists in a complex state, the traditional method can only treat 0.6-1.3mg/L, and cannot effectively treat the electroplating wastewater pollutants The emission standard (GB21900-2008) in Table 3 requires the total n

Method used

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  • Method for removing nickel in chemical nickel-plating wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Collect the nickel waste water in the sump, the waste water is pressed into the chelation tank by the pump, the pH value of the waste water is controlled to be 8 with 30% sodium hydroxide, and the chelating agent is dropped into the chelating tank, and the weight ratio of the chelating agent to the waste water is 1:3500, the chelating agent includes 30 parts of mercaptan, 30 parts of sodium sulfide, and 40 parts of polymerized sodium dithiocarbamate, then add 1.8t of zeolite, 1.2t of shells, hydraulic retention for 30mins, and the wastewater after the chelation reaction flows into the composite flocculation sedimentation In the pool, put polymeric magnesium-aluminum sulfate composite flocculant into the composite flocculation sedimentation tank, the weight ratio of polymeric magnesium-aluminum composite flocculant to wastewater is 1:2000, polymeric magnesium-aluminum sulfate includes 98 parts of polyaluminum sulfate, 2 parts of polymagnesium sulfate, The hydraulic retent...

Embodiment 2

[0030] Collect the nickel waste water in the sump, the waste water is pressed into the chelation tank by the pump, and the pH value of the waste water is controlled with 30% sodium hydroxide to be 9, and the chelating agent is dropped into the chelating tank, and the weight ratio of the chelating agent to the waste water is 1:1500, the chelating agent includes 5 parts of mercaptan, 5 parts of sodium sulfide, and 90 parts of polymerized sodium dithiocarbamate, then add 2.4t of zeolite, 0.6t of shells, hydraulic retention for 1h, and the wastewater after the chelation reaction flows into the composite flocculation sedimentation In the pool, put polymeric magnesium-aluminum sulfate composite flocculant into the composite flocculation sedimentation tank, the weight ratio of polymeric magnesium-aluminum composite flocculant to wastewater is 1:3000, polymeric magnesium-aluminum sulfate includes 50 parts of polyaluminum sulfate, 50 parts of polymagnesium sulfate, The hydraulic retenti...

Embodiment 3

[0032] Collect the nickel waste water in the sump, the waste water is pressed into the chelation tank by the pump, the pH value of the waste water is controlled to be 8.5 with 30% sodium hydroxide, and the chelating agent is dropped into the chelating tank, and the weight ratio of the chelating agent to the waste water is 1:2500, the chelating agent includes 15 parts of mercaptan, 15 parts of sodium sulfide, and 70 parts of polymerized sodium dithiocarbamate, then add 1.5t of zeolite, 1.5t of shells, hydraulic retention for 75mins, and the wastewater after the chelation reaction flows into the composite flocculation sedimentation In the pool, put polymeric magnesium-aluminum sulfate composite flocculant into the composite flocculation sedimentation tank, the weight ratio of polymeric magnesium-aluminum composite flocculant to wastewater is 1:2500, polymeric magnesium-aluminum sulfate includes 70 parts of polyaluminum sulfate, 30 parts of polymagnesium sulfate, The hydraulic ret...

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Abstract

The invention discloses a method for removing nickel in chemical nickel-plating wastewater, comprising the steps of: (1) chelation reaction: reacting nickel in wastewater with a chelant to form a nickel chelate; (2) composite flocculation precipitation: subjecting a polymeric Mg-Fe composite flocculant and the nickel chelate obtained in the step (1) to composite flocculation precipitation; and (3) multimedium filtration: filtering the wastewater subjected to the composite flocculation precipitation in the step (2) by adopting a multimedium filter method. The treated wastewater is discharged when nickel content in outflow water reaches the standard. The method has the advantages of good treatment effect, simplicity for operation and management and low operation cost and is a good method for removing the nickel in the chemical nickel-plating wastewater.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for removing nickel in nickel-containing wastewater. Background technique [0002] At present, chemical nickel wastewater, that is, the wastewater produced in electroless nickel plating, often contains complex nickel, and it is difficult to make it up to standard by conventional methods. The pollution problem has always been an urgent problem to be solved in heavy metal wastewater treatment projects. The total nickel in this kind of nickel-chemical wastewater is 20-50mg / L, because part of the nickel contained exists in a complex state, the traditional method can only treat 0.6-1.3mg / L, and cannot effectively treat the electroplating wastewater pollutants The discharge standard (GB21900-2008) in Table 3 requires the total nickel to be less than 0.1mg / L, which puts a lot of pressure on the company's environmental protection. In order to solve the problem of environmental p...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
Inventor 吴基生詹旭吴迪
Owner 无锡市霄鹰环境科技有限公司
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