What is a good decolorizing agent for treating pesticide wastewater?
Thread Content
The COD of pesticide wastewater is 50,000; I now want to carry out decolorization treatment. What kind of decolorizing agent would be suitable? What are the specific steps? Thank you
Ferrous sulfate combined with lime provides a good decolorizing effect
Hydrogen peroxide and calcium hypochlorite are effective in removing the color from certain types of water
Activated carbon also offers a very significant adsorption effect, though the cost is slightly higher.
Quaternary ammonium salt decolorants work very well for certain types of water, and there are many manufacturers in China that produce them
The decolorizing agents produced by BASF can handle various types of wastewater, with significant effects in removing color, enabling the wastewater to become colorless; however, their price is higher compared to domestic decolorizing agents
Coagulation and sedimentation using PAC plus PAM can also remove color.
The methods listed above are available for your choice; you can conduct experiments in the laboratory to select the most suitable one
Another method is to carry out a chemical reaction; for example, if there are hydrophilic amino groups, diazotization can be used to remove these hydrophilic amino groups, thereby achieving decolorization
The diazotization method involves adding sodium nitrite under specific pH conditions to carry out the diazotization reaction, with very good results
What is the typical pH for the diazotization reaction, and what is the general ratio of stannous chloride used?