In wastewater there are a number of pollutants such as suspended solids, bacteria, viruses, heavy metals, etc. They need to be treated before being discharged into the environment using chemical methods. /strong>. So what are wastewater treatment chemicals? What types of chemicals are there and how to use them effectively?
The article below will help readers and customers learn more about some types of wastewater treatment chemicals.
Image of some chemicals in wastewater treatment
First, let’s find out what wastewater treatment chemicals are?
Wastewater treatment chemicals is the common name of chemicals whose purpose is to clean wastewater sources before being discharged into the environment.
These chemicals will react chemically with pollutants in wastewater and form residues, gases and safe water.
So what types of chemicals are there?
We can divide chemicals according to their form of existence or use.
Based on the form of existence, we have the following two forms:
- Solid treatment chemicals: alum, PAC, lime,..
- Liquid treatment chemicals: sulfuric acid, chloramine B…
Based on uses, we have the following chemical groups:
- Group of flocculation chemicals
- Settlement aid chemical group
- PH adjusting chemical group
- Deodorant chemical group
- Chemical group provides nutrients for microorganisms
- Chemical group that performs advanced oxidation reactions
- Disinfectant chemical group
Groups of wastewater treatment chemicals and their uses
Group of flocculation chemicals
Coagulation – flocculation is a physicochemical method used to treat suspended organic substances, dissolved substances, and colors in water. Flocculent – flocculating chemicals are added to water to help create larger size and mass flocs that can easily settle in the sedimentation tank to remove them from the water.
Commonly used coagulant and flocculating chemicals are: iron alum, PAC, etc. These chemicals are usually in solid form. When using, we must mix it with water and stir.
Depending on the turbidity and color of the water, we must mix it in different concentrations. When using these chemicals, we need to pay special attention to adjusting the pH of the water.
Image of chemicals PAC and iron alum
Settlement aid chemical group
Settlement aid chemicals are used to accelerate the flocculation process, support the settling ability of sludge flocs, and reduce turbidity, color, BOD, and COD of water.
There are two sedimentation aid chemicals: Cationic Polymer (used for wastewater containing a lot of suspended solids, which are organic substances) and Polymer Anion (used for wastewater containing a lot of suspended solids, which are inorganic substances). muscle).
Image of two sedimentation aid chemicals
PH adjusting chemical group
The pH of wastewater greatly affects the wastewater treatment processes by chemical or biological methods.
For the processes to be most effective, we need to check and adjust the pH value. Want the wastewater pH to the desired value by using pH adjusting chemicals.
To adjust the pH value of wastewater, we have two types of chemicals: acids to reduce pH and bases to raise pH. Commonly encountered such as hydrochloric acid, NaOH,…
Image of NaOH and hydrochloric acid
Deodorant chemical group
In wastewater treatment, odor is the most difficult to handle. Many chemicals are used such as Javen water, Ca(OH)2 for absorption or activated carbon for adsorption.
Image of lime and activated carbon
Chemical group provides nutrients for microorganisms
During the process of cultivating microorganisms in wastewater treatment, it is necessary to use chemicals that provide nitrogen and phosphorus nutrients for the growth and development of microorganisms. Two commonly used chemicals are phosphoric acid and urea.
Image of phosphoric acid and urea nitrogen
Chemical group that performs advanced oxidation reactions
In some types of wastewater containing pollutants that are difficult to treat, it is necessary to use advanced oxidation methods.
Advanced oxidation methods use agents with strong oxidizing capabilities such as: H2O2, K2S2O8, O3, Nano iron to oxidize organic compounds that are difficult to decompose, breaking down the chemical structure to create toxic substances. Non-toxic inorganic substances such as CO2 and H2O and inorganic acids, convenient for further processing.
Image of chemicals H2O2 and K2S2O8
Disinfectant chemical group
Disinfection is the final stage in wastewater treatment. This is to eliminate disease-causing bacteria and viruses in wastewater. Commonly used disinfectant chemicals such as: Chlorine, Chloramin B, Javen water,…
Picture chemical image of Chloramin B and Chlorine
The above article is all about common chemicals used by experts in wastewater treatment systems. We hope to contribute a small part to help readers better understand the nature of chemical use in the treatment industry. wastewater today.