The following schematic presents the basics of the Aquatic Feed manufacturing process:
Careful consideration of intake, cleaning and storage of both dry and wet raw ingredients.Dust control, odour control and potential cross-contamination enjoys special attention during design.
The nature and type of wet ingredients to be used in formulations determines the processing technology we apply and the subsequent infrastructure required. Introduction of wet ingredient is introduced into the process at a point where the risk of cross-contamination is minimised
Aquatic feeds require ﬁne grinding in order to optimise the thermal and shaping processes (extrusion or pellet pressing). In addition, small diameter hatchery feeds require superior grinding to average grist size as ﬁne as 200 micron. Ottevanger supplies size reduction solutions meeting these requirements while avoiding heat damage of costly ingredients.
The choice of extrusion technology is determined by raw ingredient, formulation and ﬁnal product requirements in terms of size, shape and density (buoyancy). (The right type of) Extrusion technology is the only solution producing ﬂoating, slow sinking and most sinking Aquatic Feeds. Shrimp feeds are traditionally manufactured through Pellet Pressing. However, extrusion solutions are available for producing extruded shrimp feeds as well.
Different approaches are followed for drying and cooling of semi-moist aquatic feeds compared to conventional aquatic feeds. The same applies for application of liquids. Ottevanger have several options for coating – vacuum coating included. The Ottevanger vacuum coating process allows for layering liquids and attractants.
Semi moist aquatic feed requires a different approach to intermediate storage of ﬁnal product to minimise the potential of product damage. Final product storage and bagging design includes a bulk load-out system; a bulk bag loadout system; a bagging plant for small bags or any combination thereof. Project requirements are carefully considered with the customer’s speciﬁc requirements in mind.
One of the key issues to successful aquatic feed manufacturing is a process control system designed to meet functional, operational and quality requirements. This includes careful consideration of process Critical Control Points and online control of processing parameters, such as moisture content and the amount of SME (Speciﬁc Mechanical Energy) required to produce ﬁnal product of speciﬁc density.
At Ottevanger Milling Engineers we take great care of the environmental impact of our plant design. The potential impact of aquatic feeds on the environment and how this is affected by processing technology, is seriously considered during design and establishment of such plants. The control of Dust, Odour , Noise and the Visual Impact of our processing solutions also enjoy detailed attention.