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Method for processing heavy metal industrial waste water with low concentration

A technology for industrial wastewater and heavy metals, which can solve the problems of unsuitable heavy metal wastewater, pollution transfer, secondary pollution, etc., and achieve the effects of reducing the risk of environmental secondary pollution, saving costs, and reducing energy consumption

Inactive Publication Date: 2008-07-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is that the amount of sludge for the traditional heavy metal-containing wastewater treatment method is large, the pollution is transferred, and it is easy to cause secondary pollution problems, and the direct electrolysis method is not suitable for low concentrations (several to tens of mg / L) Defects such as the recovery of heavy metal wastewater, providing a method for effectively concentrating and electrolytic recovery of wastewater containing lower concentrations of heavy metals

Method used

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  • Method for processing heavy metal industrial waste water with low concentration

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Embodiment 1

[0021] A method for recovery and treatment of industrial waste water with a lower concentration of heavy metals, the specific steps of the treatment method:

[0022] Step 1: collect the electroplating wastewater containing copper ions with a concentration of 12.8mg / L into the adjustment water tank, add lye NaOH, and adjust the pH to 6.

[0023] In step 2, 8.5 mM sodium dodecyl sulfate (SDS), an anionic surfactant, is added to the wastewater to reach its critical micelle concentration.

[0024] Step 3, turn on the water pump between the water tank and the ultrafiltration membrane module, filter under a pressure of 0.15MPa with a polysulfone ultrafiltration membrane with a molecular weight cut-off of 8kDa, and a tangential flow rate of 1.1m / s. The chelate is intercepted by the ultrafiltration membrane, and the formed concentrated solution flows back to the regulating water tank along with the tangential flow. The removal rate of copper ions in the filtrate of the ultrafiltration...

Embodiment 2

[0028] Concrete steps of this embodiment:

[0029] Step 1: Collect industrial wastewater containing cadmium ion concentration of 10 mg / L and lead ion concentration of 15 mg / L into the adjustment water tank, add lye NaOH, and adjust the pH to 11.

[0030] In step 2, 8.5 mM sodium dodecylbenzenesulfonate (SDBS), an anionic surfactant, is added to the wastewater to reach its critical micelle concentration.

[0031] Step 3, turn on the water pump between the adjustment water tank and the ultrafiltration membrane module, use an inorganic tubular ceramic membrane with a molecular weight cut-off of 20kDa to filter under a pressure of 0.1MPa, a tangential flow rate of 2m / s, sodium dodecylbenzenesulfonate (SDBS) The chelate with copper ions is intercepted by the ultrafiltration membrane, and the formed concentrated solution flows back to the regulating water tank along with the tangential flow. The removal rates of cadmium ions and lead ions in the filtrate of the ultrafiltration membr...

Embodiment 3

[0035] Concrete steps of this embodiment:

[0036] Step 1, the chromate (CrO 4 2- 、HCrO 4 - ) The industrial wastewater with a concentration of 100mg / L is collected into the adjustment water tank. The pH of the original wastewater is 6.5, and there is no need to add lye for further adjustment.

[0037] In step 2, 10 mM of cationic surfactant cetylpyridinium chloride (CPCl) is added to the wastewater to reach its critical micelle concentration.

[0038] Step 3, turn on the water pump between the water tank and the ultrafiltration membrane module, use a polysulfone membrane with a molecular weight cut-off of 10kDa to filter under a pressure of 0.07MPa, a tangential flow rate of 1m / s, cetylpyridinium chloride (CPCl) and chromic acid The salt chelate is intercepted by the ultrafiltration membrane, and the formed concentrated solution returns to the regulating water tank along with the tangential flow. The chromate removal rate of the ultrafiltration membrane filtrate reaches 9...

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Abstract

The invention discloses a novel method for treating waste water of heavy metal with low concentration. The waste water containing heavy metal ions is collected in a regulation water tank and certain amount of anion surfactant is added to achieve the critical micelle concentration so that the metal ions and the surfactant are strongly chelated; then, the obtained substance is filtered by tangential flow of ultrafiltration membrane and the filtered water is discharged or recycled; concentrated solution is cycled and returned back to the regulation water tank and after achieving certain concentration ratio, the obtained solution is transferred to an electrolyzer; the metal ions in the electrolyzer are reduced and precipitated and the surfactant and the metal ions are desorbed and flown back to the regulation water tank for recycling. The process for treating the heavy metal ions in the industrial wastewater with low concentration has high recycling rate, low energy consumption and no secondary pollution. The process is in particular applicable to desulfurization and plating of the industrial waste water polluted by the heavy metal.

Description

technical field [0001] The invention relates to a new method for treating industrial waste water with low concentration of heavy metals, in particular to a surfactant micelle-enhanced tangential flow ultrafiltration, concentrated solution electrolytic treatment to recover heavy metals, desorption of surfactants and metal ions can be reused Concentration and recovery treatment of industrial wastewater containing heavy metal ions. Background technique [0002] Heavy metal wastewater is ubiquitous in China's industrial production processes, such as wet flue gas desulfurization in power plants, metal processing, nuclear industry, electroplating industry, etc. If it is not handled properly, it will cause serious harm to the environment. The treatment methods of heavy metal wastewater include chemical precipitation, ion exchange resin method and adsorption method. These heavy metal wastewater treatment methods are actually a kind of pollution transfer, which converts dissolved hea...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/64C02F1/66C02F1/52C02F1/461B01D61/14
Inventor 王锦石诚李久义李进于晓华
Owner BEIJING JIAOTONG UNIV
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