COMPOSTING Dr Rameswar Panda

Teaching Asst.Dept. Of Livestock Production

ManagementCollege of Veterinary Science,Hyderabad

INTRODU

CTION

What is Composting

Composting is nothing but the process of decomposition of organic contents of the waste material.

Waste material may be one which is not having an economic value or another that is remained after extracting the utility value of imperishable objects.

Objective of Composting

objective of composting is lying on the utility of the compost.

The compost after formation is used as a fertilizer in agricultural field.

The most important consideration of using the compost in field is its organic value i.e the now obtained fertilizer is devoid of chemicals which is healthy than the conventional fertilizers that are available in the market.

2 factors are essential for composting1. Temperature2. Areation or oxygenation First, an area should be selected for the

purpose of composting which should be located in outskirt of habitation or more particularly to the near of agricultural field for convenience.

The waste materials should be gathered to undergo composting phenomenon.

The waste materials should contain more organic content.

The phenomenon occurs during the process is oxidation i.e it will oxygen for undergoing chemical equations.

Since oxidation happens, factually heat, water and Carbon dioxide will be released.

A higher temperature range of 45-65 C is maintained so that microbial action happens that include the population of bacteria, fungi and actinomycetes.

• This rich temperature establishment is due to the heat generation by thermophilic bacteria and should be maintained for 3 days strictly.

• Since organic matter is more concerned factor, cow dung/manure/slurry are mostly preferred for this purpose.

• Apart from these, other waste materials having less organic can be used by mixing with above materials.

• Hatchery waste with broiler litter has been adjudged as an effective compost means for reducing salmonella and E.coli populations in the manure.

Different composting methods

Windrow composting

• In windrow method, the composting materials are put on the ground in a straight alignment.

• The height of the windrow may be of 2-3 meter.• Since there is the concept of oxidation in this

event, aeration is necessary on periodical basis. • After making windrows, aeration is performed

by bottom blowing creating negative pressure so that the stacked foul air will be removed and fresh air will be returned.

• 2 types of blowing air to oxygenate happens.1. Bottom blowing aeration, creates positive

pressure.2. Bottom suction aeration, creating negative

pressure.

BIN COMPOSTING

2 types of bins1. Continuous vertical bins (most popular)2. Horizontal bins The most used method for dead animal

composting is Bin method.

Use of microalgae in composting

• For this algal pond is built which provide aeration.

• The contents of the pond are mixed at the rate of 20cm per second by paddlers.

Moisture % Nitrogen (kg/tonn)

Phosphorous(Kg/tonn)

Pottasium(Kg/tonn)

Fresh manure 75 13 4.5 3.6

Loose manure 64 11 6.0 7.3

Broiler manure 19 32 11 13.6

Broiler litter 14.5 13.0 10.5

animal L biogas/kg of volatile solid

L biogas/day Methane % Heat value(kcal/day)

Dairy cow (500kg)

330 1200 70 6850

Fattening pig(50kg)

630 180 65 900

Laying hen (2kg)

450 11 70 62

THANK YOU