Polymer Dosing
Bulk handling equipment since 1962
Customized solutions
Short response time
In-stock screw conveyors
Polymer dosing is the key to effective dewatering. The correct amount of polymer allows the sludge to form strong flocs, which in turn results in dry sludge, clear filtrate, and stable operation. Too little or too much polymer has an immediate impact on floc formation, filtrate quality, and machine performance. A properly calibrated polymer station ensures precise dosing every time.
Dual Tank ADT
Our dual-tank system is designed to ensure optimal dissolution and precise dosing of polymer across a wide range of applications. Featuring a proven design and carefully engineered functionality, the system delivers consistent quality, high reliability, and efficient operation.
Polymer Preparation Unit AEP
The AEP polymer preparation unit is an efficient and user friendly system that ensures a homogeneous, high quality polymer solution. It is designed to provide stable operation and accurate dosing for coagulation and flocculation processes.
Polymer System ACP
The ACP polymer system produces a homogeneous solution that ensures high quality, consistent concentration, and efficient dosing. The automated process reduces chemical consumption and delivers high operational reliability.
Big Bag Handling System ABS
Our big bag handling system is a reliable solution for dust free and safe handling of big bags. The system enables efficient emptying and downstream conveying, with a strong focus on quality, workplace safety, and long service life.
Static Mixer AIM-S
This mixer combines intelligent design with efficient process technology, reducing chemical consumption by up to 25%. The result is an optimized flocculation process.
Dynamic Mixer AIM-D
This dynamic sludge mixer blends process water with various chemical substances (such as flocculants and polymers) to improve sludge structure prior to subsequent dewatering processes.
Polymer dosing is the process of adding a carefully controlled amount of polymer to sludge to ensure effective separation of water. When the dosing is correct, the sludge forms clear and stable flocs. These flocs enable efficient dewatering and result in a dry, manageable final product.
Why Is Polymer Dosing Important?
- Improved Dewatering:
The right amount of polymer helps the sludge form large, strong flocs that expel as much water as possible. - Stable Operation:
Accurate dosing is essential for optimal performance of the screw press. - Higher Filtrate Quality:
Incorrect dosing leads to cloudy or “milky” filtrate—an indication that polymer adjustment is needed. - Lower Chemical Consumption:
Overdosing is costly and can weaken the flocs. Correct dosing saves both polymer and energy.
How Does Polymer Dosing Work?
The polymer is first mixed with water to activate it, then pumped into a mixing tank together with the sludge.
- Sludge and polymer are blended in a dedicated tank where the polymer is given time to “mature.”
- Polymer maturation time varies depending on temperature and polymer type and must be monitored closely.
- In the screw press, sludge is pushed through a filtrating zone where water drains off, while the flocs are conveyed toward the pressure zone.
Signs of Correct Dosing
- Flocs are large, firm, and stable
- Filtrate is clear, with no visible particles
- The sludge cake is dry and free of loose water
Signs of Incorrect Dosing
Underdosing:
- Small or unstable flocs
- Sludge seeps or leaks through the screen
- Filtrate becomes cloudy or milky
Overdosing:
- Flocs become slimy and break apart
- Increased polymer consumption without improved dewatering
- May cause buildup and unstable operation inside the press
How to Determine the Correct Dose
The correct polymer dose depends on sludge type, dry solids content, and temperature. Therefore, we always recommend:
- Jar Test / Small-Scale Test
A small mixing test provides a reliable estimate of the required polymer amount. - Continuous Visual Inspection
Large flocs and clear filtrate indicate correct dosing. - Adjustments During Operation
Variations in sludge (e.g., changes in DS%) require ongoing adjustments.
Equipment for Accurate Polymer Dosing
- Polymer dosing pump
- Mixing chamber
- Buffer tank with level control
- Dosing pump for the prepared polymer solution
This equipment ensures consistent and continuous polymer dosing—and therefore stable system performance.