DAGYEE Liquid Polymer Dosing Skid – Ready-to-Use Solution Preparation for Simplified Chemical Handling

Description

Automatic polymer preparation unit – Dry & Liquid Polymer Dosing System for Water Treatment

This is a liquid polymer dosing skid designed for plants that want to avoid the dust and complexity of dry powder handling. It takes liquid emulsion or solution polymer from a drum or bulk container, dilutes it to the required concentration, matures it, and delivers ready-to-use polymer solution to your dosing point. The system is simple to operate, requires minimal maintenance, and takes up very little space.

The skid uses a two-chamber design. The first chamber handles maturation—the polymer is diluted and given time to break the emulsion and activate. The second chamber stores the ready-to-use solution until it's needed. This is a simpler setup than dry polymer systems because you don't need a powder feeder, pre-wetting system, or high-speed mixer.

This system is ideal for small to medium plants, for facilities where dust from dry polymer is a concern, or for operations that simply prefer the convenience of liquid polymers over powders. It's also a good option for temporary setups or pilot plants where dry powder handling equipment is not justified.

Product Overview

The DAGYEE Polymer Preparation Unit is a fully automated system for continuous preparation of polymer solutions from dry powder or liquid polymers. The unit combines precise polymer metering, controlled wetting, gentle mixing, and age-dependent discharge to produce fully activated polymer solutions with consistent concentration and quality.

Key Components:

• Polymer powder hopper with level sensor

• Precision dosing screw feeder driven by VFD motor

• Pre-wetting system to prevent agglomeration

• Three-chamber tank (mixing + maturation + storage)

• High-speed mixer in mixing chamber

• Low-speed mixer in maturation chamber

• Automatic water control with flow meter

• PLC control panel with HMI touch screen

• Complete piping and skid mounting

Core Function:
The system takes raw polymer powder or liquid, meters it accurately, mixes it with water, matures it to full activation, and stores the ready-to-use solution for dosing to the application point—all automatically and continuously. The PLC controls the entire sequence, from water filling to polymer feeding to solution transfer between chambers.

How the Activation Process Works

Step 1: Polymer Supply
Liquid polymer is supplied from a drum, IBC, or bulk tank. A metering pump draws the polymer and delivers it to the dilution system. The pump is controlled by a VFD, so you can adjust the flow rate precisely. The VFD allows fine-tuning to match the required polymer consumption.

The system includes a suction line with a strainer to catch any debris or lumps before they enter the pump. This is a simple but important detail that protects the metering pump from damage.

Step 2: Dilution Water
A flow meter and control valve regulate the water flow. The water is mixed with the polymer concentrate in an inline static mixer. The static mixer has no moving parts—it uses internal baffles to create turbulence and mix the polymer and water thoroughly.

The dilution ratio is controlled by the relative speeds of the metering pump and the water control valve. The PLC adjusts both to maintain the concentration you set.

Step 3: Emulsion Breaking
Liquid emulsion polymers are supplied as water-in-oil emulsions. The polymer is in the water phase, suspended in the oil phase. When you add water and mix, the emulsion breaks and the polymer releases into the water.

This process happens in the maturation chamber. The polymer solution flows into the chamber and is kept in gentle motion by a low-speed mixer. The mixer helps break the emulsion completely without shearing the polymer chains. The solution stays in this chamber for the programmed maturation time, typically 15 to 30 minutes for liquid polymers.

Step 4: Storage and Dosing
The matured solution overflows into the storage chamber. A gentle agitator keeps it uniform. When dosing pumps call for solution, it's ready to go. Level sensors control the preparation cycle.

Step 5: Supply to Process
The ready-to-use polymer solution is pumped to the dosing point by a metering pump or a centrifugal pump, depending on the application and required pressure. The dosing rate can be adjusted to match the process demand.

The system operates in two main modes: solution preparation and dosing.

1. Solution Preparation

• For dry reagents (lime, powdered carbon, dry coagulants): reagent is fed from hopper via feeder into mixing device, mixed with water to specified concentration. Finished solution is stored in tank.

• For liquid reagents (chlorine, hypochlorite, liquid coagulants): reagent is delivered from storage tank via dosing pump to dissolution tank (if dilution needed) or directly to dosing pump.

2. Dosing
Finished solution is delivered to the process via dosing pumps with adjustable capacity. Dosing is controlled by signals from process controllers (flow, pH, turbidity, ORP) or according to process specification.

Control Modes:

• Automatic — from process controllers

• Semi-automatic — from control panel

• Manual — local pump and valve control

Polymer Preparation unit Model

Polymer preparation Unit Advantage

Reduced Chemical Consumption
Proper polymer activation significantly reduces chemical usage. Automated systems typically reduce polymer consumption by a substantial margin compared to manual batching, delivering significant cost savings over time.

Precision Preparation and Dosing
The use of variable frequency drive screw feeders and accurate water metering ensures consistent solution concentration. The ratio of water flow to powder feed rate determines concentration, and the automated system maintains this ratio precisely.

Considerable Savings in Running Costs
Precise polymer preparation reduces waste and optimises performance. Well-controlled hydraulic retention and contact times ensure the polymer reaches full activation before dosing, maximising its effectiveness.

Labour Saving and Easy Operation
The system is fully automated. Operators only need to spend a short time per day on refilling the hopper and visual inspection. No dedicated operator is required for continuous operation.

Space Saving and System Centralisation
The compact skid-mounted design integrates mixing, maturation, and storage in one unit. This saves valuable plant space and simplifies installation.

Optimised Mixing Properties
Separate high-speed and low-speed mixers in different chambers ensure proper dissolution without damaging polymer chains. This preserves flocculation performance and ensures complete polymer activation.

Zero Powder Loss
Enclosed systems eliminate dust exposure and ensure full utilisation of polymer without waste. This improves operator safety and reduces chemical costs.

Material: Stainless Steel, PP, or FRP

Bottom line: If your budget allows, pick stainless steel. Pay once and use it for 15 years. You will not have to think about it again.

I have seen too many plants buy a PP tank to save money. Three years later, the tank is cracked and leaking. The fittings are brittle. They end up buying a stainless steel unit anyway. The cheap one ends up being the expensive one.

Feeding Screw: What Matters

The feeding screw is the heart of the dry polymer preparation system. Its design and operation directly impact solution quality and chemical consumption.

Precision Auger and VFD Control
The powder feeder uses a precision-machined screw auger driven by a variable frequency drive motor. The VFD allows the operator to control the exact RPM of the screw, ensuring accurate polymer feed regardless of powder characteristics or hopper level.

Heated Discharge Pipe
Polymer powders, especially polyacrylamide, are hygroscopic and can absorb moisture from the air, causing clogs at the feeder outlet. DAGYEE installs a heating element around the feeder discharge pipe to prevent this common issue, ensuring consistent powder flow and reducing maintenance.

Pre-Wetting System
To prevent agglomeration and ensure complete dissolution, dry polymer is wetted immediately after metering. The pre-wetting device uses a carefully designed water spray pattern to separate individual polymer particles before they enter the mixing chamber. This prevents the formation of undissolved lumps that waste chemical and can cause blockages downstream.

Tapered Hopper Design
The polymer hopper is designed with tapered geometry to promote consistent powder flow. A level sensor alerts operators when refilling is needed, ensuring uninterrupted operation. This design eliminates bridging and ensures the screw feeder receives a consistent supply of powder.

Anti-Caking Heater
Polymer powders can absorb moisture from the air and form lumps that prevent flow. DAGYEE units include a gentle heating element at the feeder discharge to prevent moisture from accumulating on the screw. This is essential for powder flow consistency, particularly with polyacrylamide powders that are prone to caking.

Direct Coupling
The screw feeder motor is directly coupled to the auger for precise speed control and reliable operation, eliminating belt slippage and ensuring consistent feed accuracy.

Polymer preparation Unit Feature

Polymer preparation Unit Remark

♦ Model selection: Process capacity or flow volume is necessary
♦ Raw material: SS304 or SS316.
♦ Manufacturer: We have our own workshop so that best quality and loweat price can be provided for you.
♦ Customization: Custom-made is available.

Standard Inclusions:

• Two-chamber tank (polypropylene)

• Powder feeder with hopper and screw

• 2 mixers (dissolution + maturation)

• Water supply system with filter and valves

• Control unit (timer or PLC)

• Wheeled skid

• UPVC piping

• Operation and maintenance manual

What Makes DAGYEE Units Different

Summary

The DAGYEE Liquid Polymer Dosing Skid is a simplified, cost-effective solution for plants that use liquid emulsion or solution polymers. It prepares ready-to-use polymer solution from concentrate, matures it to full activation, and stores it for dosing. The two-chamber design is compact and simple. The PLC automation ensures consistent operation.

If you want to avoid dry powder handling, if you have limited space or staff, or if you're running a smaller plant, this skid gives you the polymer preparation capability you need without the complexity of a dry polymer system.

Contact Us

The DAGYEE Liquid Polymer Dosing Skid provides simplified, dust-free polymer preparation for plants using liquid emulsion or solution polymers. It's compact, cost-effective, and easy to operate.

Contact our team for a free consultation and system sizing for your application.

Get in Touch:
 Free Application Assessment – We'll look at your wastewater and suggest what fits
 Customized Design – Built around your flow, space, and treatment goals
 Fast Quotation – Detailed estimate within 48 hours
 Project References – We'll share examples of similar installations
 Factory Tour – Come see our facility

DAGYEE offers free sizing help. Tell us your plant flow, sludge type, and dewatering equipment. We will tell you what fits.

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