Polyethylene Chlorination Package

The polyethylene chlorination package, or chlorine dosing system, is one of the important pieces of equipment in the process of disinfecting water, wastewater, and treated effluent. By dosing a chlorine solution in a controlled way, this system helps reduce microbial contamination and control pathogenic microorganisms in water and effluent.

The chlorination package is usually used in water treatment plants, domestic and industrial wastewater treatment packages, water storage tanks, effluent recycling systems, swimming pools, RO units, food industries, livestock farms, poultry farms, and civil construction projects.

Poly Payesh designs and builds the chlorine dosing package based on the water or effluent flow rate, the type of disinfectant, the dosing point, the fluid quality, the required level of automation, and the project standard.

What Is a Chlorination Package?

A chlorination package is a ready-made, engineered assembly for preparing, storing, and dosing a chlorine solution into water or effluent. This package usually includes a polyethylene tank, a dosing pump, a mixer, an electrical panel, a chassis, piping equipment, valves, and control equipment.

The main goal of chlorination is disinfecting water or effluent and reducing the amount of pathogenic microorganisms before discharge, storage, or reuse.

Chlorination can be done using various substances; but in many projects, chlorine-based solutions such as sodium hypochlorite are options worth considering due to the ease of transport, storage, and dosing.

The choice of the type of disinfectant, the dosing amount, the contact time, and the installation location of the package must be determined based on the specifications of the water or effluent and the project requirements.

How Does the Chlorine Dosing Package Work?

The operation of the chlorination package is based on preparing a chlorine solution and dosing it precisely into the pipeline, the contact tank, or the transfer route of the water and effluent.

The process usually includes the following stages:

Storing the chlorine solution in the polyethylene tank
Mixing and homogenizing the solution if needed
Suction of the solution by the dosing pump
Adjusting the dosing rate based on the project’s needs
Dosing the chlorine solution into the water or effluent line
Providing sufficient contact time for disinfection to occur
Controlling the residual chlorine, if needed
Discharging, storing, or using the water and effluent in accordance with the project standard

The dosing pump can be controlled manually, semi-automatically, or fully automatically. In sensitive projects, the dosing control can be based on the flow rate, residual chlorine measurement, or a command from the central control system.

The Role of Chlorination in Water and Wastewater Treatment

Chlorination is usually used at the end of the treatment process or at specific points on the water and effluent transfer line. This process is not a substitute for physical, chemical, or biological treatment; rather, it is used as a disinfection or microbial-control stage.

In a wastewater treatment system, the chlorination package can be installed after the following units:

Activated sludge wastewater treatment package
EAAS wastewater treatment package
SBR wastewater treatment package
MBBR wastewater treatment package
IFAS wastewater treatment package
MBR wastewater treatment package
Sand filter and carbon filter
Supplementary treatment units
Treated effluent storage tank

In such conditions, disinfection can help reduce the microbial load of the effluent and prepare it for discharge or reuse, if it complies with the required standard.

Main Components of the Chlorination Package

The chlorination package is designed according to the capacity, the type of chemical, the installation conditions, and the required level of automation. The main components of this system can include the following:

Polyethylene Tank

The polyethylene tank is used to store the chlorine solution or other disinfectants. The tank must be chosen from a suitable material that is resistant to chemicals.

Important features of the chlorination tank:

Suitable resistance to corrosion
Resistance to chemicals
The ability to be installed in industrial environments
The ability to be chosen in various capacities
The possibility of using a single-layer, double-layer, or triple-layer tank suited to the project
The possibility of installing a level sensor and alarm equipment

Dosing Pump

The dosing pump is the most important piece of equipment in the chlorination package for the precise, adjustable dosing of the chlorine solution.

The functions of the dosing pump include the following:

Suction of the solution from the tank
Dosing the disinfectant into the pipeline or tank
Adjusting the dosing amount
Controlling the flow rate of the chemical
The possibility of connecting to the automation system
The possibility of manual or automatic adjustment suited to the water or effluent flow rate

In various projects, depending on the type of chemical, the line pressure, the required flow rate, and the operating conditions, diaphragm, solenoid, or suitable industrial dosing pumps can be used.

Tank Mixer

In some applications, a mixer is used to homogenize the chlorine solution or prepare the solution in the tank.

The mixer of the chlorination package can include the following:

Electric motor
Corrosion-resistant shaft
Chemically resistant impeller
A holding and mounting system on the tank

The choice of mixer must be made based on the type of disinfectant, the tank volume, the solution concentration, and the operating conditions.

Chlorination Package Chassis

All the main equipment of the package, including the tank, pump, electrical panel, mixer, and piping, can be mounted on a metal chassis or a suitable structure.

A suitable chassis provides the following advantages:

Easier transport of the equipment
Greater order in the layout of the package
Reduced installation time at the project site
Better access for servicing and maintenance
The possibility of building the package as an integrated, prefabricated unit

Electrical Panel and Control System

The electrical panel is responsible for controlling the operation of equipment such as the dosing pump, the mixer, the level sensors, and the alarm system.

Depending on the project’s needs, the electrical panel can be designed as follows:

Manual control
Semi-automatic control
Fully automatic control
Control based on the flow rate
Control based on time
Control based on residual chlorine
The ability to connect to a PLC or central monitoring system
Equipped with a low-solution alarm for the tank
Equipped with protection for the pump and electrical equipment

Piping and Dosing Equipment

The dosing section of the package can include the following equipment:

Chemically resistant pipe and fittings
Check valve (non-return valve)
Dosing valve
Dosing injector
Relief valve
Drain valve
Suction filter
Chemically resistant suction hose or pipe
Flow meter or flow-control equipment if needed

The choice of pipe and fitting material must be consistent with the type of disinfectant and the line-pressure conditions.

Types of Chlorination Packages

Chlorination packages can be categorized based on the type of disinfectant, the tank capacity, the control method, and the project application.

Manual Chlorination Package

In the manual model, the dosing amount of the disinfectant is adjusted by the operator. This model can be suitable for smaller projects or applications with constant conditions.

Semi-Automatic Chlorination Package

In this model, part of the operation of the pump and mixer is controlled automatically; but the main settings or the dosing amount may be done by the operator.

Automatic Chlorination Package

In the automatic model, the dosing pump can be coordinated with the water flow rate, the timing, the tank level, or residual chlorine measurement.

This model is more suitable for projects that need more precise control, reduced human error, and performance logging.

Sodium Hypochlorite Dosing Package

This model can be used for dosing a sodium hypochlorite solution in the disinfection of water, wastewater, and effluent. The choice of concentration, dosing amount, and related equipment must be made based on the project conditions.

Chlorination Package for Wastewater and Effluent

This model is usually installed after the biological or supplementary treatment units, and its goal is to reduce the microbial contamination of the effluent before discharge or reuse.

Drinking Water Chlorination Package

In drinking water projects, the chlorination design must be done with greater care; because the dosing amount, the contact time, the residual chlorine, and the water quality must be consistent with the relevant criteria and standards.

Applications of the Chlorination Package

The chlorination package can be used in various water and wastewater projects, including:

Disinfecting drinking water
Disinfecting treated effluent
Urban and rural water treatment plants
Domestic wastewater treatment packages
Industrial wastewater treatment
Water storage tanks
Water and effluent recycling systems
Swimming pools and aquatic complexes
Food industries
Livestock farms and poultry farms
Greenhouses and agricultural units
RO systems and industrial water treatment
Civil construction and workshop projects
Buildings, hotels, and accommodation complexes
Hospitals and medical centers, after reviewing the project conditions

Advantages of the Polyethylene Chlorination Package

The polyethylene chlorination package can have the following advantages in suitable projects:

Suitable resistance to corrosion
The ability to be designed and built in various capacities
Quick installation capability
The possibility of executing the package as an integrated unit
The ability to adjust the dosing amount
The possibility of manual, semi-automatic, or automatic control
Suitable for water, effluent, and wastewater
The possibility of installing a level sensor and a low-solution alarm
The possibility of connecting to a central control system
Relatively simple repair and maintenance
The ability to use various dosing pumps
The possibility of customizing the equipment based on the project conditions

Important Points in Designing a Chlorination Package

Designing a chlorination package should not be done based on the tank volume alone. To choose the correct equipment and dosing amount, various factors must be reviewed:

The water or effluent flow rate
The quality of the inlet water or effluent
The amount of microbial contamination
The type of disinfectant
The concentration of the chlorine-based substance
The dosing point
The required contact time
The required residual chlorine
The fluid temperature
The pH
The presence of organic matter, ammonia, or chlorine-consuming compounds
The dosing-line pressure
The type of use of the output water or effluent
The need for manual or automatic control
The space available for installing the equipment

In sensitive projects, determining the exact dosing amount must be done based on testing, the water or effluent quality, the operating requirements, and the relevant standards.

What Is Residual Chlorine and Why Is It Important?

After chlorine is dosed, part of it reacts with the organic matter, microorganisms, and compounds present in the water or effluent. The amount of chlorine that remains in the water after these reactions is called residual chlorine.

Controlling residual chlorine is very important; because:

Too little of it may reduce the effectiveness of disinfection.
Too much of it can be undesirable for some applications.
Its suitable amount depends on the type of water, the type of use, the contact time, and the project criteria.
In automatic projects, a residual chlorine analyzer can be used to control the dosing pump.

What Is Chlorine Contact Time?

Contact time is the duration for which the chlorine solution, after being dosed, has the opportunity to remain in contact with the water or effluent so that the disinfection process can take place.

For this reason, in many projects a chlorine contact tank or a piping route with a suitable retention time is provided after the dosing point.

Without sufficient contact time, even if the disinfectant is dosed, the expected result in terms of reducing microbial contamination may not be achieved.

The Difference Between the Chlorination Package and a UV System

Chlorination and UV are both used for disinfection, but their operation is different.

In the chlorination system, the disinfectant is dosed into the water or effluent and, if adjusted correctly, can create a residual effect in the transfer route.

In the UV system, disinfection is done with ultraviolet radiation, and no chemical is added to the water. But UV usually has no residual effect in the route, and the quality of the inlet water, especially the clarity and the amount of suspended solids, has a great effect on its efficiency.

The choice between chlorination and UV must be made based on the type of project, the water or effluent quality, the output requirements, the available space, the operating cost, and the need for residual chlorine.

The Difference Between the Chlorination Package and Ozonation

Ozonation is also one of the disinfection methods, but it needs equipment such as an ozone generator, a dosing system, and special safety equipment.

The chlorination package is usually simpler in terms of structure, equipment, and operation, and is more widely used in many water and wastewater projects.

However, the choice of disinfection method must be made based on the real conditions of the project and the required output quality.

Safety Points for the Chlorination Package

Chlorine-based substances can be corrosive and irritating. For this reason, the design, installation, and operation of the chlorination package must be done while observing safety principles.

The most important safety points are:

Installing the package in a location with suitable ventilation
Using personal protective equipment during servicing and charging the substances
Preventing contact of chlorine-based substances with acids or incompatible materials
Using a tank and piping resistant to chemicals
Providing a leak-collection tray or containment basin in projects that require it
Installing a level sensor to prevent the pump from running dry
Using a check valve and safety equipment on the dosing line
Installing warning labels and an operating manual
Periodic servicing of the dosing pump, mixer, and dosing equipment
Training the operator before operating the package

Chlorination Package for Treated Effluent

In many wastewater treatment packages, chlorination is used as the final disinfection stage.

After leaving the biological units such as activated sludge, EAAS, SBR, MBBR, IFAS, or MBR, the effluent can enter the chlorine contact tank.

Choosing a chlorination package for treated effluent must be done based on the following:

The output effluent flow rate
The amount of remaining suspended solids
The microbial quality of the effluent
The type of final use of the effluent
The available contact time
The required amount of residual chlorine
The need to remove or control residual chlorine before discharge, if the project requires it
The discharge or reuse standard

What Factors Does the Price of the Chlorination Package Depend On?

The price of the chlorination package depends on the technical specifications and the equipment required for the project.

The most important factors affecting the price are:

The capacity of the polyethylene tank
The type and concentration of the disinfectant
The type of dosing pump
The required dosing flow rate and pressure
The need for a mixer
The material of the mixer shaft and impeller
The type of electrical panel
The level of automation
The need for a PLC
The need for a level sensor
The need for a residual chlorine sensor
The type of chassis
The material of the piping and valves
The presence of a chlorine contact tank
The transport, installation, and commissioning conditions
The need for safety and leak-control equipment

For an exact price quote, the fluid flow rate, the type of water or effluent, the disinfectant, the line-pressure conditions, the required dosing amount, and the project’s level of automation must be specified.

Design and Construction of the Chlorination Package by Poly Payesh

Poly Payesh designs and builds the chlorination package to suit the real conditions of the project.

In the technical review stage, the following are evaluated:

The type of use of the water or effluent
The flow rate
The fluid quality
The disinfection goal
The dosing point
The type of disinfectant
The required tank capacity
The dosing pump flow rate and pressure
The available contact time
The need for residual chlorine control
The level of automation
The installation space
The need for safety equipment
The operation and maintenance conditions

The goal is to design a system that is consistent with the project’s needs in terms of dosing precision, safety, maintenance, and operating cost.

To receive specialized consultation, a technical review of your project, and a price quote for the polyethylene chlorination package, get in touch with the experts at Poly Payesh.

Frequently Asked Questions About the Chlorination Package

What is a chlorination package?

A chlorination package is a ready-made system for storing, preparing, and dosing a chlorine solution in a controlled way into water, effluent, or wastewater for the purpose of disinfection.

What equipment does a chlorination package have?

This package usually includes a polyethylene tank, a dosing pump, a mixer if needed, an electrical panel, a chassis, piping, valves, dosing equipment, and control sensors.

Is the chlorination package suitable for wastewater?

Yes. The chlorination package can be used after the wastewater treatment stages to disinfect the treated effluent.

What is the function of the dosing pump?

The dosing pump draws the chlorine solution from the tank at an adjustable flow rate and pressure and doses it into the water or effluent line.

Is the chlorine dosing amount the same for all projects?

No. The dosing amount depends on the flow rate, the type of water or effluent, the pH, the temperature, the amount of organic matter, the contact time, and the required output quality.

What is residual chlorine?

Residual chlorine is the amount of chlorine that remains after reacting with the substances present in the water or effluent. Controlling it is important to ensure the effectiveness of disinfection and to prevent over-dosing.

Can the chlorination package be automatic?

Yes. The chlorination package can be designed as manual, semi-automatic, or fully automatic, and in the automatic models, dosing is controlled based on time, flow rate, or residual chlorine measurement.

Is the chlorination package a substitute for wastewater treatment?

No. Chlorination is a disinfection stage and is not a substitute for the main physical, chemical, or biological treatment processes.

What information is needed to request a price for the chlorination package?

The water or effluent flow rate, the type of fluid, the type of disinfectant, the line pressure, the dosing point, the level of automation, the tank capacity, and the disinfection goal are important pieces of information for design and pricing.