By Kundan Pandey Down to Earth, Nov 30, 2014
Bengaluru
farmers have revived the practice of using human excreta as manure. This has
created an informal economy that is benefiting many.
Farmer Raj
Anna has been making unprecedented profits from his farmland since the past few
years. The 42-year-old earns more than Rs 15 lakh a year. Ask him how he
manages such a handsome income and he replies—through human excreta. Anna is
one of the 1,000-odd farmers in Bengaluru who have revived the lost practice of
using human excreta as manure.
“Our
ancestors used human excreta in farmlands. In fact, as a child, I saw my father
design a latrine using a net of wood. In summers, he would cover the latrine
with husk. Later, he would use the waste in the farm,” says Anna, adding that
it was a natural process in the earlier days as people would defecate in farms.
“With the popularity of modern-day latrines this practice has reduced in the
past few decades,” he points out.
Anna, who
was the first farmer in Bengaluru’s Veer Sagara suburb to start using human
waste as manure, explains that the idea came to him one day when he saw a
honey-sucker truck—a specialised vehicle used for extracting and transporting
waste—dumping human excreta in a fallow piece of land. “Initially, I would wait
for the trucks to dump the waste in fallow land and then transport it to my
farmland. Later, I dug a big pit and asked the drivers to directly dump the
waste on my land,” he says. According
to him, it is a win-win situation for all, with him getting free manure and the
trucks getting a free space to dump the waste. “In a few months, I started
getting so much waste that I began selling it to other farmers,” adds Anna.
Today,
this has started an informal trade in Bengaluru which is benefiting the
farmers, owner of honey-suckers and citizens who are not connected to the
sewerage system. The informal sector today employs close to 200,000 people and
is worth Rs 75 crore.
A win-win
situation
Bengaluru
has a population of 8.5 million, as per the 2011 Census. Ideally, the Bengaluru
Water Supply and Sewerage Board (BWSSB) should take care of sewage treatment
and disposal. But the reality is that just 40 per cent of the city is connected
to the sewage network, according to the Comptroller and Auditor General report
2011. The rest of the city, or 5.1 million people, have on-site sanitation with
off-site disposal, or are forced to defecate in the open, says a paper prepared
by the International Water and Sanitation Centre in 2012.
Bengaluru-based
engineer S Vishwanath, who coauthored the paper, says the huge population in
the country not connected with the sewage system has to find its own way to
handle the waste. This is the basis of the new informal economy that is
emerging in the city. The areas that do not have a sewerage connection have
septic tanks and rely on private honey-sucker operators to empty the tanks. The
truck operators, who earlier struggled to find wasteland to dump the excreta,
now have free space in farmlands.
Farmers in Bengaluru are using human excreta as
manure to grow high-quality grass (Photographs: Kundan Pandey)
Nageshwar
Rao, who owns eight honey-sucker trucks, admits competition has increased in
his business after farmers started taking the waste. “Earlier, farmers were
approaching vehicle owners and even giving money to have the sludge dumped into
their fields. Now, there is much competition in the market. We approach the
farmers to take the sludge to their fields,” says Rao.
He
reveals that earlier he used to charge at least Rs 1,500 to clean one pit, but
the cost has come down because of increased competition. “We at times are
forced to offer services at as low as Rs 700,” he says. While there is no
official figure available, operators claim that at least 500 honey-sucker
trucks are active in the city.
This boom
is also helping the manufacturers of honey-sucker trucks, who say they are
finding it difficult to meet the surge in demand. “We take 20 days to make a
honey-sucker truck with the capacity of 4,000 litres. It costs the customer Rs
2.5 lakh. But now many people are converting regular tankers into honey-suckers
for gathering and carrying waste,” says Doreswami, who owns one of the two
major honey-sucker manufacturing garages in the city.
Profits
for all
The
informal sector today employs close to 200,000 people and is worth Rs 75
crore
Farmers
More
than 1,000 farmers on the outskirts of Bengaluru are using human waste as
manure. They claim the shift has increased their produce and reduced their
dependency on fertilisers
Colonies without sewerage line
Almost
5.1 million people are not connected to the sewage network in Bengaluru. They
now pay less to get their septic tanks cleaned by honey-sucker trucks
Honey-sucker truck operators
The
number of honey-sucker truck operators has shot up after farmers started
taking human excreta from them. Many are also converting regular trucks into
honey-suckers now
Honey-sucker manufacturers
Manufacturers
in Bengaluru say people are now converting their regular trucks into
honey-suckers because of the growing demand
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The
farmers who have taken to the practice say it has benefited them in more ways
than one. For starters, their dependency on fertilisers has gone down. They are
also saved from the side-effects of chemical fertilisers. As a result, Anna,
who owns 2.5 hectares, now farms on an additional 2.5 hectares he has taken on
lease. “I recently bought a crop cutter worth Rs 4 lakh and plan to take more
farmland on lease,” he adds.
“Human
excreta contains nutrients such as nitrogen, phosphorus and potassium, which is
good for plants,” says C A Srinivasamurhty, professor and head of the soil
science and agricultural chemistry department at the University of Agricultural
Sciences, Bengaluru.
In fact,
the 2012 paper carried a case study on the annual value of human excreta in the
African nation of Niger. It shows that average excreta produced per family per
year in Niger is equivalent to approximately 90 kg of chemical fertiliser,
which is well beyond the reach of any small farmer. The situation will not be
very different in India. (Estimate for India)
A health
hazard
While the
people are happy with the arrangement, experts warn that dealing with human
waste poses some health concerns as well. For instance, it can lead to cholera,
diarrhoea and several other infections.
Vishwanath
also points out that using human excreta directly on farmland increases the
chances of groundwater contamination. “Bengaluru’s water level is low, which
reduces the risk of groundwater contamination,” he adds. Experts believe that
the new informal economy that is picking up in Bengaluru offers a viable method
to reuse human waste. They suggest government intervention to regularise the
system. “The country is struggling with its waste and this offers a solution.
The only problem with the model is that it is unregulated. If monitored
properly, this locally developed model can play a significant role in handling
human waste,” says Vishwanath.