OneHeavy metal wastewater treatmenthazards
Heavy metal wastewater is generally used in mining, metal smelting and processing, electroplating, tanning, pesticides, papermaking, paint, printing and dyeing, nuclear technology and petrochemical industries.
Heavy metals are difficult to biodegrade and are easily absorbed and enriched by bioabsorption, and their toxicity is persistent, which is a very potentially harmful pollutant, which will cause serious threats to the ecological environment and human health if not treated.
IIWhat are the heavy metal wastewater treatment technologies?
Biological law
Biological method refers to the method of removing heavy metals with the help of flocculation, absorption, accumulation, enrichment and other actions of microorganisms or plants.
This method mainly includes: bio-flocculation method, phytoremediation and bio-adsorption method, among which the more representative is the bioadsorption method, which uses its own extracellular polymer to separate metal ions, and some bacteria release proteins during growth, which can convert soluble heavy metal ions in the solution into precipitates and remove.
Physical Law
The physical method refers to the method of separation by adsorption and concentration of heavy metal ions without changing the chemical morphology of heavy metal ions.
This method mainly includes: adsorption method, solvent extraction method, evaporation and solidification method, ion exchange method and membrane separation method, etc., the representative is the adsorption method, that is, the use of porous mechanism of material adsorption to eliminate heavy metal substances in wastewater technology, the key to adsorption technology in the selection of heavy metal adsorption substances, the common adsorption substance is activated carbon, which has a strong adsorption capacity for heavy metals.
Chemical method
Chemical method refers to the method of removing heavy metal ions through chemical reactions.
This method mainly includes: chemical precipitation method, electrochemistry and polymer heavy metal capture method, etc. The representative is the sulfide precipitation method (heavy metal scavenger JCET-1), in which the pH value of heavy metal wastewater is withered to a certain alkaline, and then sulfide is added to the heavy metal wastewater to make the heavy metal ions react with sulfide ions to form insoluble metal sulfide precipitates, which are then filtered and separated. The amount of sediment is small, easy to dehydrate, and the sediment metal grade is high, which is conducive to the quality of the metal.
Chemical precipitation:
Chemical precipitation method is widely used in industrial heavy metal wastewater treatment is a more effective method, which is a method of adding chemicals to the water body and removing heavy metal ions through precipitation reaction, mainly including hydroxide precipitation and ferrite method.
Electrochemical method: Electrochemical method is a competitive water treatment method developed in recent years, which applies the principle of electrolysis to purify wastewater through electrode reaction and migration of heavy metal ions in solution. With the development of science and technology, the improvement of traditional electrochemical treatment process and the development of new electrochemical reactors, the application of electrochemical method in the field of heavy metal wastewater treatment is more effective and extensive.
Polymer heavy metal capture method:
Heavy metal scavenger JCET-1 is a chemical agent strongly chelated with heavy metal ions (copper, nickel, zinc, etc.), using grafting synthesis process, the chelating groups on the branch chain can chelate heavy metals to form stable insoluble matter and precipitate, so that the wastewater can meet the discharge standard.
Principle:Heavy metal ions are chelated by a variety of chelating groups to produce a hydrophobic structure and precipitate
Advantages:The dosage is small, and the metal removal ability is strong
Removal rate:The ion rate of heavy metals in wastewater is greater than 95%.
Applicable Industries:It is suitable for wastewater containing heavy metals discharged in industrial production processes such as electroplating, circuit boards, surface treatment, electronics, etc.
Project Parameters
Name: Heavy metal scavenger JCET-1 pH: 75-11
Chelation content: 12mmo1cu g Appearance: White solid.
Specification: 25kg bag Free alkali: 05
Function: Precipitation by chelating heavy metal ions by a variety of chelating groups to produce a hydrophobic structure;
Storage conditions: The storage environment should be cool, ventilated and dry.