ABSTRACT

Technical evaluation of a cassava pelleting machine was carried out to determine the machine's peleting efficiency, speeds of operation and moisture content at which the machine pellets. The machine has a capacity of 318kg/hr of grated cassava mash. It produced pellets of 2mm, 3mm and 4mm diameters respectively with pellet lengths of 4cm or more depending on the moisture content of the grated mash. The machine consists . of a steel cylindrical barrel of 26cm diameter and 82cm length, enclosing a screw auger of pitch 11cm and pitch screw diameter of2lcm. the machine is driven by a 3HP geared electric motor. An average pelleting efficiency of 75.13% was achieved with the machine using grated mash of 15% moisture and pelleting speed of250rpm

TABLE OF CONTENTS

TITLE PAGE

DECLARATION

CERTIFICATION

DEDICATION

ACKNOWLEDGEMENT

TABLE OF CONTENTS

LIST OF TABLES

LIST OF FIGURES

ABSTRACT

CHAPTER ONE

1.1 INTRODUCTION 1

1.2 PROBLEM STATEMENT' 4

1.3 AIM OF THE PROJECT 5

1.4 OBJECTIVES OF THE PROJECT 5

1.5 SCOPE OF THE PROJECT 5

1.6 EXPECTED CONTRIBUTION TO KNOWLEDGE (IMPACT) 5

CHAPTER TWO

LITERATURE REVIEW

2.1 DESCRIPTION/ HISTORY OF CASSAVA

2.2 PROCESSING OF CASSAVA ROOT

2.2.1 Cultivation of cassava

2.2.2 Harvesting of cassava root

2.2.3 Uses of cassava

2.2.3. J Human Food

2.2.3.2 In Folk Medicine (ethanomedicine)

2.2.3.3 As Energy (bio-fuel)

2.2.3.4 As Animal Feed

2.3 CASSAVA PESTS

2.4 PELLETING

2.5 CASSAVA PELLETS

2.6 PRODUTION OF CASSAVA PELLETS

2.6.1 Production of cassava pellets from raw cassava root

2.6.2 Production of cassava pellets from cassava chips

2.7 HISTORY OF PELLETING MACHINES

2.8 DEVELOPMENT OF PELLEITING, MACHINES OR EXTRUDER S

2.9 TERMINOLOGY OF A PELLETING MACHINE

2. JO TYPES OF PELLETING MACHINES

2.11 RESPONSE SURFACE METHODOLOGY

2.11.1 Fundamentals of response surface methodology

2.11.2 Goals of response surface methodology

CHAPTER THREE

3.0 MATERIALS AND METHODS

3.1 DESCRIPTION OF CASSAVA PELLETING MACHINE 26

3.2 OPERATION OF THE MACHINE 27

3.3 METHODOLOGY 27

3.3.1 Machine inspection 27 ✓

3.4 MATERIAL 27

3.4.1 Detennination of moisture content 28

3.4.2 Detennination of angle of repose 28

3.4.3 Detennination of throughput capacity 29

3.4.4u Detennination of machine speed 29

3.4.5 Detennination of pelleting efficiency 30

3.5 MAINTENANCE OF THE MACHINE 30

3.6 MATAL COSTING 31

CHAPTER FOUR

4.0 EXPERIMENT AL METHODS AND RESULTS 32

4.1 EXPERIMENTAL DESIGN 32

4.2 EXPERIMENT AL RESULTS 32

DISCUSSION OF RESULTS 37

CHAPTER FIVE

5.0 CONCLUSION AND RECOMMENDATION 38

5.1 CONCLUSSION 38

5.2 RECOMMENDATIONS 38

 REFERENCES 39 

LIST OF TABLES

Table 3.1- Table showing material costing 31

Table 4.1- variables in the RSM Design 33

Table 4.2- Experimental Data and observed Response values for the RSM 34

Table 4.3- Regression analysis 35

Table 4.4- Analysis of variance 36 ,I

LIST OF FIGURES

Fig 1.1 -Production process for cassava operation

Fig2.1 -Graphical illustration of 2° order response function

Fig 2.2 Graphical illustration of a 2

nd order response for K=2