Unlocking the secrets of Flocculants in wastewater treatment: How much to add to wastewater?

发布于: 2023-09-22 16:21

When treating wastewater, the question often arises: how much flocculant should be added to one ton of wastewater? The answer is not as simple as a one-size-fits-all solution. Let's dive into the fascinating world of flocculants and explore the factors that affect the amount needed.

Flocculation process explained

Flocculation is the most important step in wastewater treatment. It is a process that causes particles suspended in water to stick together and settle. This happens when the particles form bridges with groups on the molecular chains of polymers through a process called adsorption. However, the amount of flocculant required depends on several factors.


Factors affecting flocculant effectiveness


Molecular structure of flocculants: 

The molecular structure, charge density, and Molecular weight of flocculants are significant. These characteristics determine how effectively it can influence flocculation.


Specific surface area in wastewater treatment: 

The surface properties of suspended particles also play a critical role. Their concentration, chemical properties, and specific surface area also matter. It is a complex process in which the flocculant must find a suitable partner.


pH value and flocculation:

 The pH value of the water is a decisive factor. The acidity or alkalinity of the water alters how well the flocculant does its job.


Electrical conductivity in flocculation:

 The electrical conductivity of the water can either hinder or promote flocculation. It depends on the type and amount of substances present.


Temperature's impact on flocculation:

 The temperature of the water also plays a role. Warm or cold, it can impact the efficiency of flocculation, speeding up or slowing down the process.


Equipment in wastewater treatment:

The equipment, or the way the water is agitated, can modify the process. Filters and centrifuges differ in their mechanical effect on sediment so if you choose not strong enough, not weak enough, or not charged enough, the process can go the wrong way. 


Coagulants and flocculants selection

For this, we have a team of qualified consultants who, in cooperation with our high-tech laboratory, will help you find the right product for your conditions.


 This will help you save your budget on coagulants and flocculants that don't fade in your environment. 

 Time, not wasting it on an endless search for information and people who will solve your problem.

 Human resources put the task in the hands of professionals and free yourself from more important things.

How to determine flocculant dosage:


In wastewater treatment, knowing the correct dosage of flocculant is key. Sand washing typically requires the addition of 12–20 grams of polyacrylamide flocculant per ton of turbid water. 


For mineral processing wastewater, the dosage can be adjusted depending on the sand content. As a rule, 6 g of polyacrylamide per one ton of wastewater is sufficient.


When it comes to coal preparation wastewater, it is a similar story. The dosage is about 6g/per ton. But pay attention: these figures refer to anionic polyacrylamide with a molecular weight of 16-18 million.


In municipal wastewater treatment plants where cationic polyacrylamide is used for sludge dewatering, 20-40 g may be required. The dosage depends on the sludge concentration and the type of dewatering filter, press, or centrifuge.


Our overall responsibility

When choosing the dosage and type of flocculant, it is particularly important to achieve harmony between mankind and nature. Our ability to protect the environment is our shared responsibility, and understanding the nuances of processes like flocculation in wastewater treatment is an essential part of that journey.


So the next time you wonder about flocculant dosages for wastewater treatment, remember that it's not just about numbers but about balancing science, nature, and our desire to make the world a cleaner place.