Chemical Dosing

What is chemical dosing?

Chemical dosing is the addition of chemicals to the water/fluid or sludge to achieve the desired conditioning. This will make the treatment effective through various mechanisms, such as charge neutralization, solids settling, etc. This process is also referred to as chemical metering and is a very important part of the water treatment process.

Applications of chemical dosing

  • Wastewater Treatment
  • Water purification and pollution control
  • Scale prevention
  • Swimming pool treatment
  • Acid water and
  • Liquid fertilizer treatment
  • Coagulation and turbidity removal
  • Hydroponic nutrient treatment
  • Food processing
  • Iron, hydrogen sulfide and manganese removal
  • Detergent and wetting agent metering

How the stoichiometric process works?

The operator of an industrial wastewater treatment plant determines the chemicals that need to be added to the water and also needs to be constantly aware of what is happening in the treatment plant and adjust the dose level and rate accordingly. For example, if the water needs to be disinfected, the appropriate amount of chlorine is added. Overall, they know the levels of chemicals present in the wastewater and chemically measure them accordingly.

However, manual checks and manual dosing are not applicable in medium to large water treatment plants, and the dosing of chemicals is often done at regular intervals through automated dosing systems, with the entire process monitored by an operator for efficiency. Common dosing systems include chemical dosing systems and polymer preparation systems, the former for the automatic dosing of various chemicals, while the latter is used for the preparation and dosing of various polymer types.


Cooling tower dosing system is a kind of equipment that can both configure solution and quantitatively and regularly dose chemicals. It is used for cooling tower dosing scale inhibitor, chemical industry, printing and dyeing to dose a certain amount of chemicals, acid and alkali at regular time and quantity.

A number of chemicals are added to pools to achieve proper pool operation. These chemicals are used to disinfect and sterilize and maintain the cen brightness of the water, the former to protect the health of swimmers and the latter to maintain the visibility of the water. The main disinfectants used in swimming pools are bleach, sodium hypochlorite, chlorine-containing disinfectants (TCCA), trichloroisocyanuric acid and several others. The disinfection method used needs to have a significant germicidal efficacy and be able to eliminate germs quickly, i.e. 99.9% of the microbial strains are resolved within 30 seconds.

Dosing system is a metering pump as the main dosing equipment, the dissolved drug tank, stirrer, liquid level meter, safety valve, check valve, pressure gauge, filter, buffer, pipeline, valve, base, escalator, automatic monitoring system, power control system, etc. according to the process needs to be assembled on a public platform, forming a module, that is, the so-called skid-mounted combined unit (“skid body”). Such a standard system is easy to build, easy to transport, and can be quickly accessed and used at the same time.

The dosing system is a complete set of equipment with dosing, mixing, conveying liquid and automatic control, which is used in raw water of power plants, boiler feed water, oilfield ground collection and dewatering treatment system and wastewater treatment system.

Concentrated H2SO4 is used as absorbent, because dilute sulfuric acid contains a lot of water, SO3 and water will produce acid mist, which is not conducive to the absorption of SO3. At the same time, H2SO4 also controls the pH of cooling water.

Cooling tower circulating water treatment agents commonly used are: scale inhibitors, corrosion inhibitors, algaecides (water treatment biocides), cleaning agents, slime strippers, flocculants, coagulants, dispersants and other water treatment agents, cooling towers often breed bacteria, bacteria accumulate to form biofilms, biofilm generation to form slime, affecting the stable operation of the circulating cooling water system. Each cleanup not only affects the use, but also the consumption of manpower and material resources. Want to permanently maintain the normal operation of the cooling circulation system, you must thoroughly remove the biofilm in the cooling tower.

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