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Sulfide precipitation method for treating wastewater containing heavy metal ions

A heavy metal ion, sulfide precipitation technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of small sulfide crystal particle size, fast reaction speed, and difficult separation , to achieve the effect of cheap medicine, simple operation and convenient use

Inactive Publication Date: 2017-10-03
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fast reaction between metal ions and sulfide ions, the sulfide precipitation method has a small sulfide crystal size and is difficult to separate, which limits the application of the sulfide precipitation method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Contains Ni 2+ of industrial wastewater, its Ni 2+ The content is 10000mg / L, Ni is required 2+ The removal rate is 99%. Pass the waste water into the glass fiber reinforced plastic tank, adjust the temperature of the waste water to 40° C., and adjust the pH value to 6.

[0018] 2) According to requirements, Ni in wastewater 2+ The removal amount is 9900mg / L, adding sodium sulfide (Na 2 S), according to the formation of Ni in nickel sulfide (NiS) 2+ Ions and sulfur (S -2 ) Add sodium sulfide to 90% of the appropriate ratio, and the amount of sodium sulfide added is 11850.9mg / L.

[0019] 3) After stirring for 1 hour, let it stand still. After the solution is stratified, the supernatant is wastewater after removing metal ions, and the supernatant is pumped out of the reaction tank.

[0020] 4) Ni out of the water 2+ The concentration is less than 10mg / L.

Embodiment 2

[0022] 1) Contains Pd 2+ and Cd 2+ of industrial wastewater, its Pd 2+ and Cd 2+ Wastewater with a content of 65000mg / L and 50000mg / L respectively requires Pd 2+ The removal rate of 99.9%, Cd 2+ The removal rate is 99.5%. Pass the waste water into the glass fiber reinforced plastic tank, adjust the temperature of the waste water to 30° C., and adjust the pH value to 8.

[0023] 2) According to requirements, Pd in ​​wastewater 2+ and Cd 2+ The removal amount is 64935mg / L and 49750mg / L respectively, adding potassium sulfide (K 2 S), according to the formation of Pd in ​​lead sulfide (PbS) and sulfide interlayer (CdS) 2+ and Cd 2+ Ions and sulfur (S -2 ) The appropriate ratio of 110% to add potassium sulfide, the amount of potassium sulfide added is 126.2g / L.

[0024] 3) After stirring for 2 hours, let it stand still. After the solution is layered, the supernatant is wastewater after removing metal ions, and the supernatant is pumped out of the reaction tank.

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PUM

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a sulfide precipitation method for treating wastewater containing heavy metal ions. The method comprises the following steps: heating the wastewater to 30-40 DEG C, and controlling the pH value at 6-8; and adding an inorganic sulfide into the wastewater containing heavy metal ions, reacting the heavy metal ions with the inorganic sulfide to generate water-insoluble metal sulfides, and performing standing stratification to realize wastewater treatment, wherein the inorganic sulfide is one or more of sodium sulfide, potassium sulfide, calcium sulfide, magnesium sulfide and lithium sulfide; and the inorganic matter is added according to the removal amount of the heavy metal ions as per 90-110% of the stoichiometric mol ratio of the heavy metal ions to sulfur in the generated metal sulfides. The sulfide precipitation method provided by the invention has the advantages of cheap and accessible reagents, low addition amount, simple removal process, low investment and operation cost and the like; and the removal rate of the heavy metal ions is up to 99% or above.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a sulfidation precipitation method for heavy metal ion wastewater treatment. Background technique [0002] A large amount of wastewater containing metal ions is discharged in industrial production processes such as mining, machinery manufacturing, chemical industry, electronics, and instrumentation. This wastewater is one of the industrial wastewater that seriously pollutes the environment and is harmful to humans. The excessive enrichment of metals, especially heavy metals in the food chain will cause great harm to the natural environment and human health. It is of great significance to remove metal ions in wastewater. The removal methods of metal ions in wastewater mainly include chemical, physical and biological methods. The chemical method converts dissolved metal ions in wastewater into water-insoluble metal compounds through chemical reactions, and removes pre...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/52C02F101/20C02F101/22
Inventor 谢洪勇赵盈利张利
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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