MTD3063 COMPUTER AIDED DESIGN

SEMESTER 2 SESSION 2020/2021

PROJECT REPORT

GROUP C

PROJECT TITLE: HOME COMPOST BIN

 I. PROJECT TITLE

Home Compost Bin

II. ABSTRACT

Composting is defined as the biological degradation process of heterogeneous solid

organic materials under controlled moist, self-heating, and aerobic conditions to obtain a
stable material that can be used as organic fertilizer. Composting is a form of waste disposal
where organic waste decomposes naturally under oxygen-rich conditions. Although all waste
will eventually decompose, only certain waste items are considered compostable and should
be added to compost containers. Food waste, such as banana peels, coffee grinds and
eggshells, are great items to compost. The existing compost bins have few challenges which
are difficult to handle such as messy and smelly compost, time-consuming process (30-45
days), prone to insects and rodents and hard to clean. In addition, some of them release
greenhouse gases. Cost issues are there with few automatic and high-end compost bins. This
project aims at designing a compost bin for Indian household kitchen, which is easy to use,
odor free, ergonomic in nature and visually appealing. Designed Compost bin consists of a
separate chamber for compost starter, composting chamber consisting of a mixing blade (runs
with help of a DC motor and rechargeable batteries), air filter setup and a compost collection
tray.

III. METHODOLOGY

To review literature survey of existing compost bins (household and Industrial),

various composting process, identifying drawbacks in the existing compost bins and
processes. Carrying out an ethnographic research focusing on product study, market study
and user study wherein interview will be conducted with user to understand the drawbacks of
the existing compost bin. Based on the data collected in literature survey and ethnography
research, Quality Function Deployment (QFD) chart is defined and based on the QFD and
literature survey, ethnography data, Product Design Specifications (PDS) is designed. To
generate concepts, develop 3D models based on the product design specifications, and choose
the final concept based on the weight ranking method. To develop a full-scale working
prototype using suitable materials of compost bin for Indian Kitchen. To carry out user
validation of the compost bin to identify the success rate of product and collect the suggestion
of the users.
IV. INTRODUCTION

The designed of Home Compost Bin aims at reducing the municipal solid waste
generated at houses and it helps the users to make their own natural fertilizer for the plants
they grow at home, which is ergonomic, odor free, easy to use, and can compost quickly.
Today solid waste management is one of the biggest problems in the world. Around 50% of
the waste in the world is organic waste. It is the mixture of both organic food waste and
inorganic waste. Around 78% is food waste, which can be recycled. Some of them is land
filled but it is not segregated properly and it mixes organic and inorganic waste, which
produces bad odor, and it will spoil the soil. To manage the solid waste, it should be properly
segregated at the source (houses). The organic and inorganic waste needs to be separated, the
organic waste can be treated to make compost, and inorganic waste can be segregated and
given for garbage collection. Compost is organic matter decomposed as fertilizer. Compost is
the key in organic farming. The process of composting requires wet organic matter known as
green waste (leaves, food waste) and waiting to break down into humus for a certain period.
Compost is rich in nutrients. It is used in small gardens, agriculture, rooftop farming etc. The
compost itself is beneficial for the land in many ways, such as soil conditioner, fertilizer,
addition of vital nutrients to soil and as a natural pesticide/insecticide for soil. In ecosystems,
compost is useful for controlling soil erosion, wetland construction and as landfill cover.

V. DESIGN CRITERIA

Product handling: The output compost should be in a form to avoid any inconvenience to
the people handling it. It should be collected in a tray and can be used easily for home
gardening.

Product size: The dimensions of the Home Compost Bin would be ergonomic in nature and
it will maintain the standard modular kitchen dimensions.

Odour free: The Home Compost Bin would not give out any bad odour.

Low noise: The Home Compost Bin’s noise limit shall be well within the limits of a kitchen
appliance.

Easy process: The home composter to be operable by everyone in the house.

Portable: The home composter to be easily movable inside the kitchen.

Aesthetics: As an integral part of an urban household, the design of the Home Compost Bin
would be at par with the other kitchen appliances.

VI. PRODUCT DESIGN SPECIFICATION

Our product specification made by plastic named PZ 250. Besides, our product move
by Motor DC which voltage 3-12v, speed 10-50 rpm, max rated torque 5 kg.cm. The Home
Compost Bin coloured by green. Product weight is 4 kg.

Measurement of product design

Composting process

 Vegetable waste is chopped finely to increase the area of decomposition with the help
of cutting blade setup.
 Addition of compost starter consisting of microbes which starts the composting
process.
 Continuous mixture of the vegetable waste and the compost starter powder for
effective composting with the help of mixing setup consists of dc motor.
 Use of a natural air filter (mixture of cow dung and neem powder tablets) for avoiding
the foul smell and to avoid insects.
  Use of calcium oxide with the compost starter mixture to maintain the initial heat and
to start the composting process.

VII. HOME COMPOST BIN MODEL DESIGN

Design of Home Compost Bin

 View from the top

View from the bottom

 View from in front

VIII. FUTURE WORK

Based on this project that we had done, we decide for future work:

1. Setup blade to multiple size for thick and thin vegetables.

2. Transparent compost drawer for easily to check whether if it already full or not.

3. Blade can be removable.

Advantage and disadvantage

Advantage Disadvantage
 Good for environment  It sucks up a lot of time and energy
 Natural,organic fertilizer  Efficiency depends on your amount
of organic waste
 Less cost involved  Can’t afford too many waste

IX. CONCLUSION
 Compost Bins play a major role in solid waste management in the future by
eliminating the organic waste dumping at the source and instead only dumping inorganic
waste. As the home compost bin is easy to use and is cost effective, many people can buy and
use it. This home compost bin comes with three level. Composting have great potential to
contribute to material recovery, reduction of landfill, use of renewable resources and helps in
solid waste management. The new design of the home compost bin is aesthetically good
looking can be kept inside kitchen, non-messy, no odor, keeps insects, flies away from
compost pile, and keeps the plants in the home healthy

Another design of Home Compost Bin