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Method for processing wastewater containing heavy metal ions

A technology for heavy metal ions and waste water, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problems of environmental secondary pollution, incomplete separation, and low treatment efficiency, and achieve The effect of wide application range, shortened settling time, and simple operation method

Active Publication Date: 2013-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are that the reaction precipitation speed is slow, the precipitation is poor, the separation is not complete, the treatment efficiency is low, and the drainage is alkaline, etc.
The disadvantage of this method is that it cannot form insoluble substances with sodium sulfide or potassium sulfide, such as Cr 6+ etc invalid
In addition, when sodium sulfide is used in acidic solution, hydrogen sulfide gas with foul smell will escape, causing secondary pollution to the environment

Method used

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  • Method for processing wastewater containing heavy metal ions

Examples

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Effect test

Embodiment 1

[0048] At 18°C, will contain Pb 2+ , Hg 2+ , Zn 2+ 、Cu 2+ Wastewater such as heavy metal ions is discharged into the pH value adjustment tank with stirring device, and Ca(OH) is continuously added at the same time 2 Adjust the pH of the wastewater to 8 ± 0.5. Next, the wastewater is discharged into the vulcanization analysis reactor with a mechanical stirring device, and at the same time, the chemical formula is Na 2 S 3 The sodium polysulfide, its addition is calculated as S:Me=2:1 with the total molar ratio of heavy metal ions in sulfur and waste water. After reacting in the vulcanization desorption reactor with mechanical stirring device for 60 minutes, the waste water is discharged into the flocculation tank with stirring device, and anionic polyacrylamide is continuously added under stirring at the same time, and the addition amount is 15 mg per liter of waste water. After the wastewater stays in the flocculation tank for 3 minutes, it is discharged into the sedimen...

Embodiment 2

[0052] At 20°C, will contain Pb 2+ 、Cr 3+ 、As 3+ 、Cu 2+ , Zn 2+ Wastewater containing heavy metal ions is discharged into a pH value adjustment tank with a stirring device, and NaOH is continuously added to adjust the pH value of the waste water to 7±0.5. Then, the waste water is discharged into the vulcanization analysis reactor with mechanical stirring device, while continuously adding chemical formula is Na S Sodium polysulfide, its addition is calculated as S: Me=3: 1. After reacting for 90 minutes in the vulcanization analysis reactor with mechanical stirring device, the waste water is discharged into the flocculation tank with stirring device, and at the same time, non-ionic polyacrylamide is continuously added under stirring, and the addition amount is 20 mg per liter of waste water. After the wastewater stays in the flocculation tank for 4 minutes, it is discharged into the sedimentation tank, and after it stays in the sedimentation tank for 75 minutes, the supern...

Embodiment 3

[0056] At 28°C, will contain Pb 2+ , Hg 2+ , Zn 2+ 、Ni 2+ Wastewater containing heavy metal ions is discharged into a pH value adjustment tank with a stirring device, and NaOH is continuously added to adjust the pH value of the waste water to 9±0.5. Next, the wastewater is discharged into the vulcanization analysis reactor with a mechanical stirring device, and at the same time, the chemical formula is Na 2 S 2 The sodium polysulfide, its addition is calculated as S:Me=2.5:1 with the total molar ratio of heavy metal ions in sulfur and waste water. After reacting for 45 minutes in the vulcanization analysis reactor with mechanical stirring device, the waste water is discharged into the flocculation tank with stirring device, and at the same time, anionic polyacrylamide is continuously added under stirring, and the addition amount is 15 mg per liter of waste water. After the wastewater stays in the flocculation tank for 5 minutes, it is discharged into the sedimentation tan...

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Abstract

The invention relates to a method for processing wastewater containing heavy metal ions, and belongs to the chemical field. The method comprises the following steps: 1, discharging the wastewater to a pH adjustment tank at normal temperature in order to adjust the pH value of the wastewater to a predetermined value; 2, discharging the wastewater obtained after step 1 to a curing precipitation reactor, adding a polysulfide precipitating agent to covert the heavy metal ions in the wastewater into insoluble substances of the heavy metal ions, and precipitating the insoluble substances of the heavy metal ions while precipitating elementary sulfur; 3, discharging the wastewater obtained after step 2 to a flocculating tank, adding a flocculating agent to flocculate the insoluble substances of the heavy metal ions and the elementary sulfur; and 4, discharging the wastewater obtained after step 3 to a precipitating tank, precipitating, and discharging the obtained supernatant. The method has the advantages of high removal rates of a plurality of the heavy metal ions, no secondary pollution, low cost, and easy realization.

Description

technical field [0001] The invention relates to a method for treating industrial waste water, more particularly, relates to a method for treating waste water containing heavy metal ions. Background technique [0002] Heavy metal ions and their compounds in water can accumulate and accumulate in fish, other aquatic organisms, and crop tissues, and participate in the biosphere cycle. Through drinking water and the food chain, heavy metals will accumulate in the human body and become poisoned, and even cause death. [0003] Wastewater containing heavy metal ions mainly comes from the washing water of plating parts in electroplating plants, drainage of mine tunnels, non-ferrous metal smelting, pickling wastewater of non-ferrous metal processing plants, pickling wastewater and electrolysis of steel plants, petrochemical catalysts, pesticides, medicines, paints, dyes Wastewater from various factories. [0004] At present, the methods for treating wastewater containing heavy metal...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F101/20
Inventor 王道泉马兰兰赵璞赵桂瑜孙杰魏令勇
Owner CHINA PETROLEUM & CHEM CORP
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