PAC (Polyaluminium Chloride) is a commonly used coagulant in water treatment, used to remove suspended solids and impurities. The traditional manual dosing method has problems such as inaccurate dosage and high labor intensity. The PAC dosage machine integrates a metering pump, a mixing system, and intelligent control to achieve fully automatic operation of the drug preparation and dosing, and is widely used in municipal water supply, industrial wastewater, power plant circulating water, and other fields.
Core Principle Overview
The entire dosing process of the PAC dosage machine is as follows:
1. PAC powder enters the mixing tank through a screw feeding device;
2. After adding water, it is mixed by a low-speed paddle mixer to prevent damage to the molecular structure of PAC;
3. The dissolved liquid flows into the stabilization tank for further stabilization;
4. The metering pump automatically adjusts the output according to the water flow rate, turbidity, and other signals;
5. It is added to the front section of the reaction tank to promote the occurrence of flocculation reaction.
PAC Dosage Machine Parameter Table
|
Parameter Category |
Typical Parameter Range/Description |
|
Solution Ratio Concentration |
Solid PAC：5%-20%;Liquid PAC: 5%-25%, can be diluted before dosing |
|
Metering Pump Type |
Mechanical Diaphragm Pump, Screw Pump, Plunger Pump; equipped with variable frequency regulation function |
|
Dosage Flow Range |
Adjustable, common range is 0.5 - 500 L/h, high flow rate can reach several m³/h |
|
Working Pressure |
Below 0.2 MPa, overpressure requires a pre-pressure reducing valve |
|
Stirrer Type |
Agitator (flat blade/sloping blade), generates radial or axial force; suitable for low viscosity liquids |
|
Stirrer Motor Power |
Dependent on the size of the box, small equipment is approximately 0.37 - 1.5 kW |
|
Solution Storage Tank Volume |
Common sizes are 100L, 500L, 1m³, etc., three-chamber design (preparation, maturation, storage) |
|
Control Method |
Manual/Automatic Switch; supports PLC control, PID regulation, remote monitoring |
|
Material Requirements |
Contacting the drug liquid part: PE, PVC, 304 stainless steel, carbon steel lined with rubber |
|
Automation Function |
Level interlock control for water supply, closed-loop control for dry powder dosing, fault alarm, automatic start/stop |
Application scenarios of PAC dosing machine
Municipal water supply system
In water treatment plants, PAC dosing machines are commonly used in the pre-treatment stage of raw water, added before the sedimentation tank to reduce turbidity to below 1 NTU, ensuring the stable operation of subsequent filtration and disinfection processes.
01
Sewage treatment plants
For domestic sewage or industrial wastewater, PAC dosing machines can effectively remove SS (suspended solids), some heavy metal ions, and color; when used in combination with coagulant PAM, the SS removal rate can reach over 95%.
02
Industrial circulating cooling water system
In power plants, chemical plants, etc., it is used to control the rate of scaling and corrosion, extend equipment service life, and maintain the heat exchange efficiency of the system.
03
Specific industrial wastewater treatment
It is widely used in industries such as papermaking, dyeing, and pharmaceuticals, treating high-concentration organic wastewater or difficult-to-degrade pollutants, meeting discharge standards requirements.
04
Boiler feed water and furnace water treatment
In thermal power plants, it is used in the external dosing process of the boiler, such as adding coagulants to raw water and adjusting pH of condensate water, to ensure the safe operation of the thermal power system.
05
Characteristics of the PAC dosing machine
It adopts PLC or single-chip microcomputer control system, which can automatically monitor water quality parameters (such as turbidity, pH value), and adjust the dosage in real time.
It supports remote monitoring, data recording and report generation, meeting environmental protection compliance requirements.
It is equipped with fault alarm, low liquid level protection, dual pump redundancy functions, etc., to ensure continuous and stable operation.
It uses diaphragm pump or piston pump, combined with variable frequency control and PID algorithm, the dosage error can be controlled within ±1%.
Compared with manual operation, it can save 15%-30% of chemical dosage, while reducing energy consumption and labor inspection costs.
The equipment is designed as an integrated unit, integrating solution tank, metering pump, stirrer, filter, control cabinet, etc. Installation is convenient and the floor space is small.
The key components are made of corrosion-resistant materials (such as PP, PVC, PVDF, 304 stainless steel), which can extend service life and reduce maintenance costs.
It can be customized according to the treatment scale (smaller than 50m³/h for small-scale, larger than or equal to 500m³/h for large-scale), adapting to different water volume requirements.
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