Technologies developed

Dept. of Farm Machinery and Power Engineering

Sl.No. Name of the equipment Year
1. Paddy thresher/Winnower 1972
2. Paddy Winnower 1972
3. Helical blade puddlur 1973
4. Groundnut stripper (M) 1973
5. Maize sheller 1974
6. Dry land weeder 1974
7. Groundnut decorticator (hand operated) 1974
8. Cotton seed delinting machine 1975
9. Jasmine Oil extraction plant 1975
10. Groundnut grader 1975
11. Sweep (Animal drawn) 1975
12. Sunflower seed sheller 1976
13. Double walled bamboo bin 1976
14. Paddy harvester (belt type) 1977
15. Chaff cutter (power) 1977
16. Cup feed 5 row seed drill (AD) 1978
17. Husker sheller for maize 1978
18. Cup feed three row seed drill (AD) 1979
19. Groundnut decorticator (power) 1979
20. Kovai planter (AD) 1980
21. Multipurpose tool bar (AD) 1980
22. Low cost power tiller 1980
23. Combination Tillage tool 1982
24. Wide bed former cum seeder 1982
25. Tapioca sett cutter 1982
26. Bed furrow former (TD) 1983
27. Paddy transplanter (M) 1985
28. Improved Seed planter (AD) 1987
29. Improved gorru (AD) 1987
30. Cultivator seed planter 1987
31. Castor sheller (power) 1988
32. Broad bed former cum seeder (TD) 1989
33. Paddy seeder (TD) 1989
34. Self-propelled paddy harvester 1989
35. Low volume sprayer (battery) 1991
36. Chaff cutter 1992
37. Axial flow pump 1992
38. Auger digger 1993
Bush clearing machine 1994
40. Egg scale seperator 1995
41. Terracer cum leveller 1995
42. Power weeder 1996
43. Low draft chisel plough 1996
44. Direct Paddy seeder 1997
45. Corcyra moth collector 1997
46. Areca sprayer 1997
47. Paddy harvester (0.75 m/SP) 1998
48. Coconut tree sprayer 1998
49. Fodder sorghum harvester 1999
50. Groundnut thresher 1999
51. Groundnut harvester (TD) 1999
52. Ridger seeder 1999
53. Trencher 1999
54. Axial flow pump model – II 1999
55. Paddy-green manure seeder 2000
56. Basin lister/ Broad bed former cum seeder 2000
57. Turmeric harvester (PT) 2000
58. Auger digger model – II 2000
59. Power rotary and earthing equipment 2001
60. Power tiller seeder 2001
61. Boom sprayer 2001
62. Air assisted seeder 2001
63. Turmeric harvester (TH) 2001
64. Lawn mower 2002
65. Para plough (TD) 2002
66. Hill drop mechanism 2002
67. Tapioca harvester (TD) 2003
68. Improved paddy seeder 2003
69. Foot wear – manual sprayer 2003
70. Banana Clump remover (TD) 2004
71. Cotton stalk puller (TD) 2004
72. Oil palm harvesting tool 2004
73. Groundnut harvester (PT) 2004
74. Semi-automatic three row vegetable transplanter 2005
75. Air assisted seed drill (PT) 2005
76. Mini paddy combine 2006
77. Coconut Tree climber 2006
78. Two row finger rotary weeder for paddy 2006
79. Seed cum fertilizer drill 2006
80. Power tiller operated slasher cum instu shredder 2007
81. Tractor operated rotary spading machine 2008
82. Tractor operated subsoil coir pith applicator 2008
83. Twin row precision organic manure cum fertilizer applicator 2009
84. Worker friendly arecanut stripper 2009
85. Multirow power weeder for SRI 2009
86. Needle type tray seeder for vegetable nursery 2010
87. Steering system for power tiller trailer combination 2010
88. Palmyra tree climbing device 2011
89. Automatic protray vegetable nursery machine 2011
90. Aerial access hoist for coconut harvesting 2012
91. Fertilizer dibbler for ratoon sugarcane 2013
92. SRI protray seeder 2013
93. Tapioca harvester (TD) 2014
94. Turmeric planter (TD) 2015
95. Cluster Onion harvester 2016
96. Device for controlled depth of puddling 2016
97. Tapioca detopper (TD) 2016
98. Self-propelled combine harvester for groundnut 2016
99. Automatic transplanter for SSI 2017
100. Automatic protray seeder for Red gram 2017
101. Tractor operated cluster onion harvester 2018
102. Automatic vegetable transplanting mechanism 2018

Dept. of Food Process Engineering

S. No. Year Technology
1. 1990 Briquetting machine for coir pith
2. Seed coating machine
3. Bottling of sugarcane juice
4. 1993 Adhesive from tamarind kernel powder
5. Stored grain insect trap
6. 1995 Insect trap
7. 1997 Particle board from coir pith
8. 1999 Stirring mechanism for starch settling
9. 2000 Tomato seed extractor
10. Brinjal seed extractor
11. Pulper cum washer for coffee
12. 2001 Process for tomato concentrate
13. 2003 Mechanical thresher for pepper
14. Fluidized bed dryer for mushroom
15. Extrusion cooking of finger millets
16. 2004 Improved turmeric boiler
17. Hand operated thresher for pepper
18. 2005 Peeler cum washer for production of white pepper
19. Cleaner cum grader for pepper and cardamom
20. Garbling unit for cardamom
21. Value added cabbage
22. 2009 Improved dhal mill

Centre for Post Harvest Technology

1. Double Chamber Centrifugal De-Huller For Millets

Millets are highly nutritious with good quality protein, rich in minerals, dietary fibre, phyto-chemicals and vitamins.  People have started realizing the importance of the millet and the consumption has gone up in recent years.

De-hulling is the one of the important post-harvest operations carried out for the removal of husk from millets. At present de-hulling is carried out with the abrasive roller type machines as exclusive de-huller for the millets are not available.  In this process, along with the husk, bran and small portion of endosperm is also removed which leads to the depletion of nutrients. Moreover the de-hulled grains contain about 20% of brokens. To overcome these problems, a double chamber centrifugal de-huller has been developed at Post Harvest technology Centre, Agricultural Engineering College and Research Institute, Coimbatore.

The developed de-huller essentially consist of feed hopper, two centrifugal chambers made of cast iron, impellers with curved vanes, blower and separate outlets for collecting kernel and husk. The unit is powered by 5 h.p. motor with suitable power transmission system. An elevator is also provided for easy feeding of the grains in to the unit. In operation the grains from the hopper enter the impeller through feed housing where it gains momentum and thrown against the cast iron chamber at very high velocity. The splitting of the husk occurs due to impact and the kernel comes out of the husk. The husk and kernel mixture passes through a chamber where they are get separated by means of a blower provided at the bottom of the unit.

 Special features

  • 10 % more recovery (since the bran is retained   in the kernel )
  • Suitable for little millet, proso millet, foxtail millet, barnyard millet and kodo millet.
  • The capacity of the de-huller is 300 kg of per hour.
  • The efficiency of the unit is 95%
  • Breakage of 4-5%.
  • Labour required: one person
  • Cost of the unit Rs.1,20,000
  • Cost of operation Rs.5 per/kg

2. Hand Operated Aonla Seed Remover

Aonla is one of the oldest Indian fruits considered as “wonder fruit for health” because of its unique nutritional qualities and therapeutic properties. Despite the potential sourceof vitamin C traditional methods of processing provides a poor quality product with low nutrient content. Aonla fruit is perishable in nature and are available only for shorter periods. It is necessary to develop improved equipment and novel methods for new product developments for the value addition of aonla.

A hand operated equipment for the removal of seed from aonla fruit was developed at the post-harvest technology center. The equipment consists of a fruit punching rod, fruit resting seat, handle with extension and the frame to hold all the important movable parts. The parts of equipment coming in contact with fruit were made out of stainless steel (food grade) and all other parts were made of mild steel. The whole equipment was electroplated to avoid blackening of parts when it comes in contact with the fruit ascorbic acid.

Specifications of the equipment

Capacity 20 kg/hr
Efficiency of de-seeding 90 percent
Percent juice wastage 2 per cent
Cost of the equipment Rs.2000/-
Cost of operation


Hand operated aonla seed remover

3. Biocolor From Beetroot

              Biocolour from beetroot was prepared by utilizing as natural colour in processed foods by replacing the synthetic colours. The beetroot was washed in water and the outer skin and stalks were removed. The peeled beetroot was cut into small pieces and pulped by adding aqueous solution containing 3.0 per cent acetone (4 part beetroot pulp: 1 part aqueous solution). The beetroot pulp was filtered and the extracted juice TSS was adjusted to 25 ° brix by adding maltodextrin. Citric acid (0.1%), calcium sterate (0.1%) and gallnut powder (2%) was added to the juice and mixed thoroughly and filtered. The filtered juice was spray dried at a temperature of 200 °c. The stability of the biocolour from beetroot powder was studied at different levels of pH, preservative and temperature respectively. The physico-chemical characteristics of the freshly prepared biocolour from beetroot powder contained sedimentation – nil, solubility -100 per cent, acetone residues – nil, colour values 88.66, 4.57 and – 2.13   L* a* b*, moisture – 2.07 per cent, pH – 4.2, carbohydrate – 69.36 per cent, protein – 5.50 per cent, fat – 0.2 per cent, fibre – 0.28 per cent, ash – 4.8 per cent, total antioxidant – 16.36 mg /g and tannin – 2.74 per cent.. The prepared biocolour was applied in processed foods viz., beverages (milk shake), jam, jelly, candies (jujups and lollipop), sweetmeats (halwa and kesari), icings and ice-cream and the level of incorporation of biocolour was optimized. Incorporation of biocolour in processed foods was ranged from 0.2 to 0.9 per cent and the synthetic colour was between 0.01 and 0.03 per cent. Organoleptic evaluation studies showed that the overall acceptability the processed products ranged from 8.0 to 8.6 initially and from 7.5 to 8.0 at the end of 180 days. For 100 kg of fresh beetroot yielded 19.0 kg of biocolour. The cost of the   biocolour from beetroot powder was Rs. 56/. per 100 gram.

Dept. of Renewable Energy

The important technologies generated in this department by the scientist and students and released in our university so far are as follows.

TNAU fixed dome type biogas plant

The cost of the biogas plant is cheaper by 50% compared to the conventional KVIC model biogas plant.  There is a good response from the farming communities for the adoption of TNAU fixed dome type biogas plant. The Govt. of India has also made the TNAU fixed dome type biogas plant for getting the central subsidy under the National project on Biogas Development and so far more than 2.00 lakh plants have been installed.

Fibre reinforced plastic (FRP) drum

In order to avoid the corrosion problem, the drum was replaced with fibre reinforced plastic drum with proper weight addition arrangement. The life of the plant is increased from 4-5 years to 15 years More than 30,000 units have been installed in Tamil Nadu.

Low cost biogas burner

The cost of burner was reduced by 60% to popularize among small and marginal farmers. There is good response for these burners form the farmers and more than 2500 farmers have adopted it.

Biogas balloon

In order to store the biogas for running the engine, a simple device as biogas balloon was designed, developed and released for the benefit of industries.

Biogas operated brooder

In order to reduce of cost of electricity for the poultry industries, biogas produced from poultry waste was utilized to operate the brooder at a cheaper rate. More than 10 industries have benefited from these units.

TNAU Sakthi Biogas plant

In order to reduce the area required for the construction of biogas plant and also to reduce the cost, the TNAU Sakthi model biogas plant was designed, developed and released. More than 100 plants have been installed so far.

Biogas cum Solar Powered Light Trap

 In order to collect and kill the insects, a biogas cum solar powered light trap has been designed, developed and released which can be operated either by biogas or solar energy. Five farmers have adopted this devices

Biomass gas stove

This stove widens the market for agro wastes, makes possible a higher efficiency and reduces the time.  Now installed in more than 200 places.

Community chulha

 It is exclusively design and developed to Cates the needs of noon meal centres.  It is efficient, smokeless and conserves feedstock.

Renewable Energy Park

 Gadgets developed at the Department of Bio Energy since 1982 are displayed in the.  More than 10000 people visited and appreciated the Park.

Rice husk gasifiier

It can be used for thermal applications in agro industries particularly in Rice Mills.  Its thermal efficiency is 55 – 60%.

Wood based gasifier

 It is designed to generate producer gas from wood wastes.  Fast growing species such as Acacia, Prosopis and Casuarina can be successfully used as feedstock.

Thermal output: 50000 kal/h

Capacity: 20 kw

Wood consumption: 20-25 kg/h

Thermal applications for medium scale industries

Pilot plant for biodiesel

It is designed to produce Biodiesel from Jatropha oil. The biodiesel production unit consists of a vessel with heater, a stirrer, a container where chemical and oil are mixed, settling tanks and finally a washing tank.  The developed unit can esterify 250 litres of biodiesel per day.  Depending upon the need, the size of the unit can be scaled up to get higher production capacity.

Efficiency: 99% conversion efficiency

Cost: 1.5 lakhs

Biomass hot air generation system integrated with Solar tunnel dryer

A continuous auto controlled drying system with combination of solar and biomass as heat source for drying various agricultural products at temperature of 60°C. This hybrid dryer facilitates drying during sunshine and off sunshine hours with enhanced quality of dried products

Drying Capacity: 2 Tonnes/batch

Drying time: 48 h for coconut

Payback period: 3.5 years

15.Night soil biogas plant of 20 m3 capacity

The anaerobic digestion of human excreta produces biogas and also reduces pathogens in the excreta and its unwanted odour and environmental degradation. The biogas production from human excreta is a boon towards safe and hygienic disposal of excreta. The moisture content of the night soil is about 90 % of the total weight with the total solids accounting about 10 %. The volatile solids accounted for about 90% of the total solids. The carbon content, nitrogen content, total potassium and total phosphorus content are in the range of 40-45, 6-7.5, 1-2 and 4-6%, respectively. Biogas produced from night soil biogas plant is used for cooking and by this plant, nearly 10 to 12 LPG gas cylinders has been saved per month.

Pyrolytic reactor for biochar production

The biochar unit developed has a capacity of 2 kg and it is highly portable in terms of size and weight. The energy efficiency of the unit is very high (71%) compared to (40%) in traditional systems. This system was evaluated for biochar production and its capacity for carbon sequestration, a measure to mitigate global warming.

Biocoal production from lignocellulosic biomass

An energy efficient high pressure hydrothermal carbonization unit of 1 L capacity has been developed to produce bio-coal from lignocellulosic biomass materials. Calorific value of bio-coal has been estimated as 25 MJ kg-1. The produced bio-coal has been proved to be promising, sustainable, energy efficient and eco-friendly solid fuel.

Tar cracking gasifier

The removal of tar and particulates has mostly been practiced as a secondary measure with downstream of the gasifier system in India. For the first time a gasifier system using primary method for the cracking of tar has been developed. This helps in achieving the prescribed limits of tar and particulate matter when coupled with a secondary system. Primary tar cracking proved to be an effective method for tar elimination in producer gas with 83% cracking efficiency. This also leads to the production of hydrogen rich gas.

Hydrothermal liquefaction reactor for biocrude oil production

Hydrothermal liquefaction (HTL) process converts waste wet biomass into a liquid fuel called biocrude. In this conversion process, elevated temperature (200–350ºC) and pressure (5–15 MPa) are used to breakdown and reform biomass macromolecules into biofuel called biocrude oil. The retention time varied from 20 to 60 min. The recovered biocrude oil can be directly combusted and used as marine fuel or upgraded by integrating downstream processes to approach petroleum oils. The biocrude oil yield was found to be 60%.