Drying poultry manure

converted PNM filepoultry-manure-dryer

With the help of the Dorset Dryer, poultry manure can be dried throughout the year and converted either into organic fertilizer or fuel. The required warm air for the drying process can for instance be derived from stable air, or it can be residual heat from the generation of electricity. Dried poultry manure is an excellent and frequently used plant nutrient, both in a dried form and as a pellet.

Dorset dryers are frequently used for drying chicken manure with the help of warm air from stables. Most of these installations do not use pre-drying in the stable, which leads to substantial savings in electricity costs. The air from the stables that is utilized usually has a temperature of approximately 20°C. This is sufficient for drying the produced manure. Still, the higher the temperature and the lower the air humidity, the better the drying process will be. Poultry manure, either in a dried form or as a pellet, is an excellent and very popular plant nutrient.

The Dorset drying system has been certified by the government of the Netherlands as a technology that limits fine particle and ammonia emissions. The particulate content of stable air is reduced (approx. by 70 – 80%). It is possible for poultry farms to receive a subsidy for this.

The advantages of drying

  • Making good use of residual heat during the entire year;
  • Lower treatment, storage and transport costs;
  • New sales and utilization possibilities;
  • Dust filtration;
  • Hygienization, including reduced emissions and odours;

Advantages of the Dorset Dryer

  • Low energy consumption;
  • Highly compact and flexible;
  • Requires little maintenance;
  • Fully automatic operation without supervision is possible;
  • Low dust generation through low air speed;

huhnerkot-trocknunggedroogde kippenmest

Drying products on a conveyor belt Dried chicken manure

dried-pelletised-poultry-manure

Dried and pelletized manure

Brochure

For more information about the drying of poultry manure please read our brochure (PDF).

 

 Pollo dryer in action 

 

 Animation showing a turn-key solution for treatment of poultry manure directly at the barn. 

Steps shown in the animation in chronological order:

daily removal of fresh manure from the barn to the dryer
the manure is dried up to 85% DM within 2 days
warm stable air from the barn is used for drying
the drier has four layers
the dried manure is transported to a bunker at the pelleting plant
in this video a toploader is used to load the manure into the pelleting plant,   because this is suitable for truck transport. No truck would be needed when the pelleting plant is close to the drier
the dry manure is dosed before entering the pelletizing press
the pellets are sanitised by storing them for 1 hour at 70˚. This makes the product exportable
the heated pellets are soft. A cooler makes them hard en removes some of the remaining moisture
bagging makes the product ready for sale.

 

Animation showing a turn-key solution for broiler manure treatment from several poultry farms or broiler houses at one centralised drying plant. Because broilers have a 6-7 weeks cycle, the method would be most effective if used with several farms combined to keep the process running with ‘fresh’ broiler manure permanently. The processed manure can be safely stored, sold as organic fertilizer or fuel for electricity production.

Steps shown in the animation in chronological order:
after the broiler cycle, removal of fresh manure from the broiler house to the dryer
optionally combined with drying of manure from layer chicken farms
in this video a toploader is used to collect the manure and load the manure into the dryer, because a toploader is suitable for truck transport. Other options are possible
the manure is dried to 85% DM within 2 days
the drier has multiple layers
the drying process is a way to effectively utilize waste heat, for example waste heat retrieved from a cooling tower at electricity production
air cleaning is a necessary step in the process to clean the air of ammonia emissions
the dried manure is transported to a bunker at the pelleting plant
the dry manure is dosed before entering the pelletizing press
the pelleting press uses a flat die
the pellets are sanitised by storing them for 1 hour at 70˚. This makes the product exportable
the heated pellets are soft. A cooler makes them hard en removes some of the remaining moisture
bagging makes the product ready for sale.

 

 

This video shows how heat from poultry manure combustion can be reused to keep the drying process running. Other steps are similar to the above animation, regarding centralised drying of manure from multiple broiler houses.