Types of Chemical Injection Pumps and Applications
Chemical injection pumps play a vital role in modern water treatment as one of the key steps in maintaining water quality, preventing pollution, and treating wastewater.
Concept and Role of Chemical Injection Pumps
Chemical injection is a water treatment process in which specific chemicals are added to a body of water to improve water quality, purify a water source, control pollutants, or achieve specific water treatment goals. This process is typically used to treat different types of water bodies such as industrial wastewater, drinking water, cooling water, and more.
The effects of chemical injection include:
Disinfection and Sterilization:
Chemicals such as chlorine or chlorine dioxide can be used for disinfection and sterilization to kill bacteria, viruses, and other microorganisms in water to ensure safe and healthy water.
Water Quality Control:
By adding chemicals, the pH, hardness, alkalinity, and other parameters of water can be adjusted to meet specific standards and requirements.
Pollutant Removal:
Some chemicals can chemically react with pollutants in water so that pollutants can be precipitated or oxidized and decomposed to achieve the removal and purification of pollutants.
Sediment Treatment:
In some industrial processes, chemicals can be used to promote the sedimentation of suspended particles, thus achieving the separation and removal of solid particles.
Anti-scaling and corrosion:
Adding appropriate chemicals can prevent the deposition of sediments and corrosion in pipes and equipment, and protect the normal operation of the water system.
Water Recycling and Recycled Water Treatment:
In recycled water systems, chemicals can be used to maintain water quality, and control microbial growth. Thus improve the efficiency and reliability of the system.
Specific Treatment Objectives:
According to different applications, chemical injection can achieve a variety of specific treatment objectives, such as oil-water separation, gas removal, etc.
Types of Chemical Injection Pumps
Chemical injection can be accomplished by a variety of technologies and devices, including:
Metering Pumps
Metering pumps are one of the most common chemical injection devices. They are able to precisely control the flow of chemicals, adding them to the water stream as needed. Different types of metering pumps include diaphragm pumps, piston pumps, and peristaltic pumps, which offer advantages in different applications.
Diaphragm pump:
The diaphragm pump is a commonly used type of metering pump. Its working principle is to drive the flow of chemicals through the movement of the diaphragm. Diaphragm pumps are generally divided into two types: pneumatic diaphragm pumps and electric diaphragm pumps. Screw dosing pumps, mechanical dosing pumps, and hydraulic dosing pumps have good sealing performance and are suitable for handling corrosive or toxic chemicals.
Piston pumps:
Piston pumps move the piston up and down to drive the flow of chemicals. They usually have high pressures and precise flow control and are used in scenarios that require high-pressure delivery. Such as membrane filtration and reverse osmosis in water treatment.
Peristaltic Pumps:
Peristaltic pumps drive the flow of chemicals by applying pressure to the hose. That returns to its original shape after being pressed, thus achieving the flow of chemicals. This pump has good corrosion resistance and reliability and is suitable for scenarios that require precise dosing, such as laboratory applications and small processing systems.
Gear Pumps:
Gear pumps drive the flow of chemicals through the rotation of gears. They are typically used for low-viscosity liquid agents and have a constant flow and pressure output.
Centrifugal Pump:
Centrifugal pumps are a common type of pump used for dosing chemicals. They create a centrifugal force by rotating the impeller, pushing the agent towards the outlet. Centrifugal pumps are suitable for applications that deal with high flow rates. However, they may not be as accurate as other metering pumps when it comes to controlling flow.
