What Is Difference Between Dry And Wet Granulation Of Compost

When it comes to compost pellet making, granulation method is a crucial step that influences the quality, durability, and usability of the final product. Composted organic fertilizer granulation processes can be broadly classified into two categories: dry granulation and wet granulation. Both methods have their unique advantages, making them suitable for different applications and material types. This article aims to elucidate the key differences between dry and wet granulation for compost pellet making. It mainly showed in 3 aspects.

The work principle difference between dry and wet granulation of compost

What is the dry granulation equipment working method?

Dry granulation method involves compressing the compost material without the addition of any liquid. This method utilizes mechanical extrusion force to compact the material into dense pellets. Often, it compress the compost into larger compacts or flakes and then mill into smaller granules.

How the working process of wet granulator machine?

Wet granulation method involves adding a liquid binder to the compost material to form a wet mass, which is then granulated and dried. Most organic fertilizer manufacturers choose the method because of its ability to produce strong, uniform compost fertilizer pellets.

What is the largest difference in key steps of compost dry and wet granulation?

The largest difference in compost granulation process of dry and wet granulation line is drying and cooling. As mentioned above, the wet granulation of compost use liquid as binder. Usually, the moisture of compost fertilizer after granulation is 12%-20%. But, for easier to store and transport, it is advisable to reduce the granulated compost moisture to below 10%. So, it needs dryer and cooler in subsequent processes. Hence, the general steps of dry and wet granulation is as follows.

Key Steps of dry compost granulation

Compost material feeder → compost crushing machine → fertilizer mixer → double roller granulator / flat die pellet machine → granule screener→ fertilizer bagging equipment.

Machines used in wet compost pellet making

Material bathing machine→ compost grinder → compost mixing equipment → disc / new type / drum granulator→ compost sieving machine→ compost dryer and cooler → automatic packing machine.

Top 3 advantages of dry and wet granulation

Advantages of dry granulation for compost processing

No Drying Required

Since no liquid adding , there is no need for a compost drying step. This greatly contribute to reduce energy consumption and process time of granular compost fertilizer.

Suitable for Moisture-Sensitive Materials

Ideal for compost materials that are sensitive to moisture or heat. Such as biofertilizer compost, humic acid, etc.

Consistent Particle Size

Produces compost pellet with uniform and consistent sizes. In addition, it can fully meet your requirements for 3-10 mm compost fertilizer granules production.

No Drying Required

Suitable for Moisture-Sensitive Materials

Consistent Particle Size

Benefits for making compost pellets with wet granulation method

Provided you want to use over 20 moisture material to make compost pellets with round ball shape, we recommend you buy wet granulation machines.

Round ball compost pellet making

Wide material granulation

Better Control compost pellets size

Round ball compost pellet making

Under the liquid cohesion and natural rolling, compost powder will form into round ball organic fertilizer granules. They have a high competitive in the organic fertilizer market.

Wide material granulation

In general, the common materials for compost pellets making has a high moisture. Such as manure compost, biogas waste compost, etc. It can makes use waste in compost material to facilitate the fertilizer pellets making.

Consistent Particle Size

Only need to adjust the compost moisture, you can control the final compost organic fertilizer pellet size easily. The less the water, the smaller the size; the much the water, the larger the size.

The above the top 3 difference between dry and wet granulation. They have their own sets of advantages and limitations, making them suitable for different scenarios in compost pellet making. Dry granulation is energy-efficient and suitable for moisture-sensitive materials. On the other hand, wet granulation offers better pellet strength and versatility but involves additional steps like drying. You can choose the better one according to your actual conditions.