Chemical Dosing Tanks

Chemical dosing tanks are a specialized container for the water treatment industry, made from polyethylene (PE). It is primarily used for the storage and dosing of chemicals in chemical plants, power plants, and oil fields. These dosing tanks are available in square and round shapes, manufactured using a rotational molding process. They have pre-installed mounting positions for metering pumps and mixers, and are available in standard colors such as white, yellow, and blue, as well as custom colors for double-layer processes.

An integrated automatic dosing device can be installed inside to complete the preparation, mixing, and delivery of chemicals. They are characterized by corrosion resistance and resistance to high and low temperatures (-40℃~80℃), and exhibit stable resistance to chemical reagents such as 30% concentration sulfuric acid and hydrochloric acid. Product capacities range from 100L to 2000L, conforming to GB standards, with a tensile strength ≥15.6MPa and an impact strength ≥15.7KJ/m². During installation, ensure the tank is level. For liquid temperatures exceeding 50℃, a metal reinforcing sleeve must be installed. Flexible connections must be used for pipe connections to prevent deformation.

With the development of technology, modern chemical dosing tanks are constantly being upgraded in terms of automation and intelligence, possessing functions such as remote control and data monitoring, thus improving work efficiency and management level. This not only ensures the stability and safety of the production process but also promotes enterprises towards green environmental protection and intelligent manufacturing.

The primary role of a chemical dosing tank is to ensure safe storage, accurate mixing, and controlled feeding of chemicals, eliminating manual handling risks and ensuring consistent dosing. Key functions include:

* Chemical Storage: Holding bulk liquid chemicals (corrosive, acidic, alkaline, or viscous) in a contained environment to prevent spills, leaks, or contamination.

* Mixing & Dilution: Blending concentrated chemicals with water (or a carrier fluid) to reach the exact concentration required for the target process (e.g., diluting 50% sodium hypochlorite to 5% for disinfection).

* Precise Dosing: Working with metering pumps (e.g., peristaltic, diaphragm pumps) to deliver a steady, adjustable flow of chemicals into the main process stream (e.g., adding coagulants to a water treatment clarifier).

Tanks are classified based on design, application, and installation:

1. By Installation Type
* Above-Ground Tanks: Most common—easy to access, install, and maintain (used for municipal water treatment, small industrial plants).
* Below-Ground Tanks: Used for space-constrained areas or to protect chemicals from extreme temperatures (requires corrosion-resistant liners and proper drainage).

2. By Design Type
* Single-Compartment Tanks: For storing and dosing a single chemical (e.g., a tank for sodium hypochlorite disinfection).
* Multi-Compartment Tanks: For blending multiple chemicals or storing different chemicals in one unit (e.g., separate chambers for acid and alkali to adjust pH).
* Day Tanks: Small auxiliary tanks that receive chemicals from a bulk storage tank and feed the metering pump—ensure a steady supply and prevent pump cavitation.

Chemical dosing tanks are used across industries where precise chemical addition is critical:

Water & Wastewater Treatment
* Adding coagulants (alum, ferric chloride) and flocculants to clarify water.
* Dosing disinfectants (chlorine, sodium hypochlorite, ozone) to kill bacteria.
* Adjusting pH with acids (sulfuric acid) or alkalis (sodium hydroxide) to optimize treatment processes.
* Adding anti-scalants to RO systems to prevent membrane fouling.

Industrial Processes
* Food & Beverage: Dosing sanitizers (peracetic acid) for equipment cleaning, or pH adjusters for beverage production.
* Electronics Manufacturing: Adding ultra-pure chemicals for semiconductor cleaning (uses high-purity stainless steel tanks).
* Mining & Metal Processing: Dosing flotation reagents or pH modifiers for ore processing.

Agriculture
* Dosing fertilizers or pesticides into irrigation systems for crop nutrition.

Cooling Towers
* Adding biocides to prevent algae growth and corrosion inhibitors to protect equipment.

* Chemical Compatibility: The tank material must resist corrosion from the stored chemical (e.g., avoid steel tanks for strong acids like hydrochloric acid).
* Capacity: Size the tank based on chemical usage rate and refill frequency (e.g., a 1,000L tank for a plant using 50L/day of chemical = 20 days of supply).
* Safety Requirements: Include secondary containment for hazardous chemicals and ventilation for volatile substances.
* Mixing Needs: Install an agitator for viscous or particle-laden chemicals to prevent settling and ensure uniform concentration.

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