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Method for removing silver, mercury and chromium in CODCr (Chemical Oxygen Demand) online monitoring waste liquor

A technology of waste liquid and supernatant liquid, which is applied in the field of chromium, mercury, and CODCr online monitoring of silver in waste liquid to achieve the effect of improving utilization rate, easy implementation and simple process

Active Publication Date: 2014-12-17
SICHUAN YUECHENG ENVIRONMENTAL PROTECTION & ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the current COD Cr Determining the pollution prevention and control of silver, chromium and mercury in waste liquid, the purpose of the present invention is to provide a method that can remove silver, mercury and chromium in waste liquid, and has simple process, easy implementation and quick effect

Method used

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Embodiment

[0029] A COD removal Cr The method for online monitoring of silver, mercury and chromium in waste liquid comprises the following steps:

[0030] (1) Collect the waste liquid into an acid and alkali resistant container, add excess sodium chloride to the waste liquid for reaction, and the AgCl formed by the reaction will naturally precipitate to the bottom of the container;

[0031] (2) Pass the supernatant in the container of step (1) into the microwave chemical reaction device, cool it after being irradiated by microwaves, and then pass it into the pH adjustment tank, and add a certain amount of Sodium chloride for full reaction;

[0032] (3) Add calcium hydroxide to the pH adjustment tank to adjust the pH value, and let it settle;

[0033] (4) Pass the supernatant in the pH adjustment tank in step (3) into the mercury removal device, add sodium sulfide into the mercury removal device for reaction, and the HgS generated by the reaction will naturally precipitate to the botto...

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Abstract

The invention discloses a method for removing sliver, mercury and chromium in CODCr (Chemical Oxygen Demand) online monitoring waste liquor to solve the problems that the existing processing technology is poor in effect of removing the silver, the mercury and the chromic and is easy to generate secondary pollution. The method for removing the sliver, the mercury and the chromium in the CODCr online monitoring waste liquor comprises the following steps of (1) enabling sodium chloride added to the waste liquor to be reacted to generate into silver chloride which naturally precipitates; (2) piping liquid supernatant into a microwave chemical reaction device, cooling the liquid supernatant after microwave radiation and piping the liquid supernatant into a PH (Potential Of Hydrogen) adjusting tank; (3) adding calcium hydroxide into the PH adjusting tank to adjust a PH value and standing to precipitate; (4) piping the liquid supernatant into a mercury removing device, adding sodium sulphide to be reacted to generate into mercuric sulfide which naturally precipitates; (5) piping the liquid supernatant into a chromium removing device, adding sodium hydroxide into the chromium removing device to adjust a PH value of the liquid supernatant, piping the liquid supernatant into a solid-liquid separation device to perform solid-liquid separation, filtering the separated liquid through an activated carbon filtering device and discharging to the exterior. The method for removing the sliver, the mercury and the chromium in the CODCr online monitoring waste liquor can remove the sliver, the mercury and the chromium in the waste liquor and can effectively recycle resources.

Description

technical field [0001] The invention relates to a method for removing COD Cr A method for on-line monitoring of silver, mercury and chromium in waste liquid. Background technique [0002] Chemical oxygen demand (COD) is an important comprehensive index to evaluate the degree of water pollution. Potassium dichromate method is often used at home and abroad to determine it, and the determination results of this method are measured by COD Cr express. In order to keep abreast of the enterprise's sewage treatment situation and monitor the enterprise's effluent situation from time to time, COD online detectors are often installed at the enterprise's main sewage pipe outlet and reclaimed water outlet. The COD online monitor generally adopts the open reflux colorimetric method of potassium dichromate to oxidize the sample. In order to accelerate the oxidation of straight-chain hydrocarbon organic matter in wastewater, a certain amount of silver sulfate (Ag 2 SO 4 ) as a cataly...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 宗渝张燕莉
Owner SICHUAN YUECHENG ENVIRONMENTAL PROTECTION & ENERGY SAVING TECH CO LTD