Page 179 - Health, Population and Environment Education 9

ii. Block method
In this method, a vehicle from municipality office
visits the locality early in the morning by blowing
whistle or ringing bell or with a siren. When the
vehicle approaches in the locality, people discharge
their wastes in those vehicles. Later on, vehicles
take away wastes to the concerned dumping sites
where they are properly dumped.
Fig: 35
iii. Door to door method
In this method, an individual visits a locality with
a tricycle or a tractor. He/she asks for wastes in
every doors in the locality. People discharge the
wastes in tricycle or tractor. Later on, that person
takes away wastes to concerned dumping site or
to a vehicle of concerned municipality office.

c. Compost preparation Fig: 36
We can manage the solid wastes by converting them into compost. The biodegradable
wastes are converted into compost in order to manage them. There are various ways of
compost preparation. Some of them are described below:

i. Aerobic method
The method of preparation of compost by bacteria
in presence of air is called aerobic method.
In this method, either a small pit (6 feet long, 3 feet
wide and 3 feet deep) or big pit (16 feet long, 3 feet
wide and 3 feet deep) is made based on the amount
of wastes produced. The biodegradable wastes
are thrown in the pit. When the pit is about full or
in every one week interval, the wastes are turned Fig: 37
upside down by means of shovel, stick or even by
hand wearing gloves. In this method, pit is not covered. So, the preparation of compost
is fast. However, this method is very stinky. It takes about one month to prepare compost
by this method.

ii. Anaerobic method
The method of preparation of compost by bacteria in the absence of air is called anaerobic
method.
In this method, either a small or big pit is made based on the amount of wastes produced.
Initially, biodegradable wastes are kept upto 9 inches at the bottom of pit. On top of them,
2 inches of cow dung and sludge is kept. The same process of keeping 9 inch wastes and 2
inch cow dung and sludge is repeated till the pit is full. The process of piling up of wastes

GREEN Environment Population and Health Education Book-9 179