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Comprehensive treatment process and device for electroplating wastewater containing heavy metal ions, Cr6+, Cu2+ and Ni2+

A technology for comprehensive treatment of heavy metal ions, applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Ecological balance and other issues, to achieve the effect of strong effective processing capacity, low equipment requirements, and environmental protection

Active Publication Date: 2012-11-21
山东同大镍网有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to save production costs, many enterprises do not pay attention to environmental protection construction and investment, and do not have a complete treatment system for electroplating wastewater, which not only fails to effectively save production costs, but also pollutes the environment and destroys the ecological balance on which human beings depend for survival.

Method used

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  • Comprehensive treatment process and device for electroplating wastewater containing heavy metal ions, Cr6+, Cu2+ and Ni2+

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Embodiment 1

[0026] A Cr containing 6+ 、Cu 2+ 、Ni 2+ A comprehensive treatment process for electroplating wastewater of heavy metal ions, comprising the following steps:

[0027] (1) Measurement of heavy metal ions Cr in wastewater by spectrophotometry 6+ 、Cu 2+ 、Ni 2+ The content of each is a, b, c (mg / L), and 0.018×a (unit: Kg / m 3 , that is, the amount of medicine added to each cubic meter of wastewater, the same below) solid sodium thiosulfate (2.4×a+1.3×b+1.4×c )×10 -3 (unit Kg / m 3 ) of solid sodium hydroxide, after fully reacting for 0.5-1 hour, measure the pH value of the waste water at 8-9;

[0028] The chemical reaction formula is as follows:

[0029] 4Cr 2 o 7 2- +3S 2 o 3 2- +13H 2 O → 8Cr 3+ +6SO 4 2- +26OH - ①

[0030] Cu 2+ +2OH - →Cu(OH) 2 ↓ ②

[0031] Cr 3+ +3OH - →Cr(OH) 3 ↓ ③

[0032] Ni 2+ +2OH - →Ni(OH) 2 ↓ ...

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Abstract

The invention discloses a comprehensive treatment process and a device for electroplating wastewater containing heavy metal ions, Cr6+, Cu2+ and Ni2+. The process includes the steps of completely converting the Cr6+, Cu2+ and Ni2+ ions into hydroxide precipitate, solid-liquid separation by sedimentation, liquid treatment, solid treatment and the like. The device comprises a water collection tank, a chemical reaction tank, a physical sedimentation tank, a filter column, a pH regulating tank, an ion exchanger and a reservoir, which are connected in sequence. The comprehensive treatment process and the device have the advantages that the process guarantees treated wastewater containing the heavy metal ions to meet national standard at lowest consumption of resources, Cr6+ is not larger than 0.2mg / L, Cu2+ is not larger than 0.5mg / L, Ni2+ is not larger than 0.5mg / L, emission is safe, the treatment process is simple, device requirements are low, production cost is saved effectively, daily effectively treating capacity for wastewater is enhanced, requirements of enterprises are met, and environment is protected.

Description

technical field [0001] The invention relates to a comprehensive treatment process and equipment for electroplating wastewater, in particular to a Cr-containing 6+ 、Cu 2+ 、Ni 2+ The invention relates to a comprehensive treatment process and equipment for industrial electroplating wastewater of heavy metal ions, belonging to the field of electroplating wastewater treatment. Background technique [0002] At present, the application of electroplating has spread to various sectors of the national economy such as machinery, light industry, instrumentation, electronics, transportation, aviation, chemical industry, and metallurgy; according to national standards, electroplating wastewater is not allowed to be discharged casually, and must be treated to meet the standard before it can be safe emission. However, in order to save production costs, many enterprises do not pay attention to environmental protection construction and investment, and do not have a complete treatment syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22C02F103/16
Inventor 孙俊成魏福彬苏窈徐莉
Owner 山东同大镍网有限公司
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