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ROYAL DUTCH KUSTERS ENGINEERING : The New, High-Quality Black Soldier Fly Larvae and Frass Separator


ROYAL DUTCH KUSTERS ENGINEERING : The New, High-Quality Black Soldier Fly Larvae and Frass Separator


When Black Soldier Fly Larvae are fully grown, it is time to harvest them before they transform into prepupae. By harvesting, the larvae are separated from the remains of the (food) waste and insect manure, the so-called frass. This is where the Royal Dutch Kusters Engineering Rotoshifter comes in.

Manual Versus Automated Sieving

Manually harvesting Black Soldier Fly Larvae (BSFL) can be very time consuming and requires the presence of one or more operators. Moreover, it is impossible to reach the same shaking frequencies as automated shaking sieves. The mesh size of the sieve should be smaller when manually sieving, which means it takes even more time to separate the frass from the larvae. Even more so, sieving can require multiple sieving steps. Finally, moisture can cause separating problems and could even require a different separating method.


Rotosifter from Royal Dutch Kusters

Alternative To Sieving

But there is a third way: The Royal Dutch Kusters Engineering Rotoshifter separates BSFL using air and rotational forces and several drum screens simultaneously. This system combines two proven technologies into one, ensuring the larvae are efficiently separated from the frass.


Five benefits of the Rotoshifter technology:

  • High-quality separation
  • Less loss of fresh larvae in frass
  • Easily adjustable to match the input
  • Low energy consumption
  • Small footprint


High Purity Level and Customizable Capacity

The Rotoshifter reaches a purity level of clean larvae of 97,5 to 99,0%, assuming the systems’ variables are optimized for purity. Moreover, the maximum moist levels of the mix of BSFL and frass could be up to 60%*. The purity level of the frass could be up to 99,9%. *material depending


“Its customizable settings make the Rotoshifter fit in nearly any insect rearing process.” – Royal Dutch Kusters Engineering


Finally, the throughput capacity of the Rotoshifter is available in various models with different diameters and lengths. Royal Dutch Kusters Engineering can provide solutions for 0,5 up to 20 m³ per hour. The maximum capacity depends on the exact needs and wishes, though, because the Rotoshifter has several variables that can be adjusted to optimize the throughput or purity of the output. Besides, Royal Dutch Kusters Engineering can also provide a system to optimize the feed efficiency of the larvae. The Organic Liquefying Press separates organic waste from other (inert) materials to gain virtually pure organics.



For more information about ROYAL DUTCH KUSTERS ENGINEERING and how they can help optimize your insect farming please read pages 27-28 of Beta Buzz – The MUST-HAVE Insect Farming Publication

Alternatively, for more information on these technologies visit ROYAL DUTCH KUSTERS ENGINEERING: www.royaldutchkusters.com