Processing method and equipment of complexing agent containing heavy metal waste water

A treatment method and technology of treatment equipment, applied in the direction of metallurgical wastewater treatment, water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of small application range and high cost, and achieve easy removal and less sludge generation , The effect of reducing the cost of sludge disposal

Pending Publication Date: 2019-07-09
SHANGHAI LIGHT IND RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The adsorption method is expensive and has a small range of application

Method used

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  • Processing method and equipment of complexing agent containing heavy metal waste water
  • Processing method and equipment of complexing agent containing heavy metal waste water
  • Processing method and equipment of complexing agent containing heavy metal waste water

Examples

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example 1

[0053] Get the chemical nickel plating waste water of certain electroplating factory, nickel concentration is 144mg / L in the waste water, and pH value is 8.3. Add 10% (mass ratio) sodium hydroxide solution to the waste water to adjust the pH value of the waste water to 11.0. An oxygen source ozone generator is used to produce ozone, and an aeration head located at the bottom of the reactor is used to inject ozone-containing gas into the wastewater. The tail gas decomposes the undissolved ozone into oxygen through the tail gas decomposer and then is emptied. During the reaction process, sodium hydroxide solution was added intermittently to keep the pH value of the system between 10.9 and 11.1. The ozone reaction time is 30min. After the ozone reaction, the flocculant polyacrylamide was added to the wastewater, and the concentration of nickel in the effluent after flocculation and precipitation was 1.921mg / L. After treatment with an ion-exchange resin column, the concentratio...

example 2

[0055] Get another zinc-nickel alloy rinsing wastewater from an electroplating factory. In the wastewater, the zinc concentration is 12.30 mg / L, the nickel concentration is 8.64 mg / L, and the pH value is 11.8. Wastewater pH is not adjusted. The ozone-containing gas generated by the ozone generator is injected into the wastewater through the aeration head. During the ozone reaction process, the pH value of the wastewater will gradually decrease. The pH value of the wastewater is controlled around 11.0 by adding sodium hydroxide solution. Ozone reaction for 1 hour. After the ozone reaction is completed, flocculants are added to the wastewater. After flocculation and precipitation, the concentration of zinc in the effluent is 0.069mg / L, and the concentration of nickel is 0.453mg / L. After being treated with an ion exchange resin column, the concentration of zinc in the effluent is 0.017mg / L, and the concentration of nickel is 0.040mg / L, meeting the requirements in Table 3 of the ...

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Abstract

The invention provides a processing method and equipment of complexing agent containing heavy metal waste water. The processing method comprises following steps: the pH value of the complexing agent containing heavy metal waste water is adjusted to be in a target pH value range; ozone is introduced into the waste water for reaction, wherein in ozone reaction process, the pH value of the waste water is maintained in the target pH value range; after ozone reaction, a flocculating agent is added into the waste water for precipitation of heavy metal in the waste water; and the waste water is subjected to ion exchange to remove residual heavy metal in the waste water.

Description

technical field [0001] The invention mainly relates to the field of waste water treatment, in particular to a treatment method and equipment for heavy metal waste water containing a complexing agent. Background technique [0002] In recent years, with the increasing environmental protection standards, the wastewater discharge standards have become more and more stringent. Heavy metal wastewater also presents new changes, the composition of wastewater is becoming more and more complex, and complexing agents in wastewater are increasing. A large number of complexing agents will form structurally stable coordination compounds with heavy metals. These compounds are difficult to remove and have become difficult for heavy-duty enterprises. [0003] Common treatment methods for heavy metals in heavy metal wastewater include chemical precipitation, Fenton's method, and adsorption. The traditional chemical precipitation method is difficult to effectively remove complexed heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F1/56C02F1/66C02F1/78C02F9/00C02F2001/425C02F2101/20C02F2103/16
Inventor 车承丹王维平
Owner SHANGHAI LIGHT IND RES INST
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