Fishing Industry

Combination of macerator and specialised pump enables efficient collagen production

Fish is not just one of the staple foods in all the world's coastal regions, its high-quality constituents mean it is globally becoming a significant component of a healthy diet. Most of the residues are disposed of or processed into cheap animal feed, but the skins do for instance contain valuable proteins.

 

Background

One of the main global suppliers of catfish deals with customers in around 40 countries. The company does not just export the fish meat, it also produces high-quality by-products from the fish parts which would otherwise be designated as worthless residues. A key product is a collagen powder.

 

Challenge

The powder is produced by enzymatic hydrolysis from the catfish skins derived from the production of fillets for the global market. The fish skins are around 18 cm long and also elastic and extremely slippery due to the humid environment, so the company needed suitable pump technology in order to be able to transport them for processing. An issue here was that the fish skins are mixed with hot water in an 80:20 ratio and come into the machine at a pressure of around 2 bar, which means they are moving very fast and there is a risk that unprocessed parts might slip through.

 

Solution

NETZSCH set up a hygienic solution for this in 2015 using closed pipes and a pump, which prevents contamination of the raw material and at the same time ensures cleanliness in the production environment. In order to make the skins suitable for conveyance, the system was combined with an upstream macerator which cuts the material up into short pieces of around 2 cm. A NETZSCH twin shaft macerator was therefore used, as its speed can be adjusted to the flow of the difficult medium mixture to achieve an ideal result in terms of cutting. The maximum flow rate for this version is 80 m³/h, with larger types being able to handle up to 270 m³/h.

The macerated pieces of skin flow out of the macerator directly into a T.Proc® rotary lobe pump which handles ongoing conveyance. The pump is particularly recommended for very lumpy media due to its large free ball passage. This design leaves a lot of space for the medium and at the same time enables the rotary lobes to be removed individually, if required, without any great effort.

Despite the unusual medium, both macerator and pump have been running without any issues since installation. The company is in fact planning to order additional NETZSCH pumps for other conveyance and processing tasks.

Technical Data

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NETZSCH

T.Proc® rotary lobe pump

Taskmaster®- twin shaft macerator

Mediumfish skins
Throughput volume80 m³/h
Pressure2 bar

Products

NEMO® BO/BS Pump with Hopper in Block Construction and Flanged Drive

The NEMO® BO/BS Progressing Cavity Pump with square/rectangular hopper and coupling rod with feeding screw and force-feed chamber is employed in almost all branches of industry to provide continuous, pressure-stable, gentle and low-pulsation conveyance.

NEMO® BF Progressing Cavity Pump with Hopper and Feeding Screw

The NEMO® BF is used in all branches of industry to provide continuous, pressure-stable, gentle and low-pulsation conveyance with dosing in proportion to rotation speed. It is employed primarily for highly viscous, compacted and crumbly substances that do not have a tendency to bridge.

NEMO® SA Aseptic Pump

The NEMO® SA Aseptic Pump is employed for aseptic and hygienic applications in the foodstuff, pharmaceutical, cosmetic and chemical/biochemical industries in order to provide continuous, pressure-stable, gentle and low-pulsation conveyance and dosing in proportion to speed.

NEMO® Pump BY

NEMO® BY Progressing Cavity Pumps can be used in any area of industry where a great variety of different substances must be pumped or very precisely dosed.

NEMO® BT Immersible Pump

NEMO® Immersible Pumps are used for emptying barrels, tanks, and pits. They are also used where space is limited and the danger of cavitation may be present. In addition, these pumps are suitable for emptying barrels containing materials hazardous to water and the environment.

NEMO® C.Pro®

The NEMO® N-Ipos CY C.Pro® Dosing Pump is a fully synthetic pump for the precise dosing of a great variety of chemicals in environmental technology and the chemical industry. Its synthetic construction makes it perfectly suited for the gentle and low-pulsation conveyance and dosing of aggressive or non-aggressive chemicals.

NEMO® BH Hygienic Pump

The NEMO® BH Hygienic Pump is employed in the foodstuff, pharmaceutical, cosmetic and chemical/biochemical industries for hygienic applications and optimal cleaning. It is ideal in these settings due in part to its continuous, pressure-stable, gentle and low-pulsation conveyance and in part to its capability of dosing in proportion to speed.


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