In
recent years, the management and mitigation of the various phenomenon brought
about by anthropogenic manipulation of the environment has assumed considerable
importance. Many countries, including India, have endeavoured to develop
innovative techniques to curb environmental degradation and optimize the use of
their natural resources. The need for adoption of environmentally sustainable
practices has been globally recognized and numerous projects have been
developed to that end. Here are a few examples from India and around the world:
Use of Ducks To Treat Grey And Black Water, India
Treatment
and management of sewage is a serious issue in India. The average wastewater
generated per capita per day in India is around 121 litres. Also , it has been
found that around 73% of sewage generated in Indian cities finds its way into
rivers and other water bodies sans any treatment. Economic, easy to maintain
and sustainable solutions are needed for efficient sewage management in our
country and the Indian green service, a trust operating out of Tamil Nadu, has
taken a step towards that. Developing an ingenious way to reduce the biological
oxygen demand while ensuring aeration, the IGS has used ducks and catfishes to
treat the municipal sewage generated at Vellore. The infrastructure consists of
five treatment tanks, inhabited by around 150 ducks. The ducks take up all
algae, insects, worms and other organic matter as food. This results in increased
penetration of sunlight which acts as a natural disinfectant, preventing
mosquitoes. The constant paddling action of ducks facilitates increased
aeration. After about a month, 10-15 catfishes are introduced in the tanks.
These consume the algae on the side walls and other small organisms that escape
the ducks. In this manner, 3,00,000 litres of water is recycled each day. In
addition to recycled water, the rearing of ducks also results in other
commercial gains. Their droppings serve as good source of manure and their eggs
are consumable and provide a good source of income.
Rice-Fish Culture
Excessive
use of fertilizers, pesticides and insecticides results in rampant pollution of
the groundwater and rivers in addition to soil degradation. A notable solution
to this problem, practiced in rice growing countries like India, China and Bangladesh
is Rice-Fish Culture. It involves farmers introducing small, indigenous fish
into their rice fields. The fishes provide a source of fertilizer with their droppings,
eat pests and help to circulate oxygen around the rice fields while being
protected from birds among the dense rice plants. Farmers have reported that
keeping fish can increase rice yields up to 10% while also providing an
additional supply of fishes. This practice results in better crop yield while
significantly reducing the pollution caused by the use of chemical fertilizers
and pesticides.
Waste Handling And Management, Germany And Singapore
Management
of municipal wastes, both solid and liquid, is an uphill task for any growing
economy. While most countries struggle with staggering figures and insufficient
infrastructure, Germany and the city-state of Singapore lead by example. Power
generation and recycling take care of 98% of Singapore's solid waste while only
2% is sent to landfills. Almost 3% of the country's electricity needs are met
by its waste-to-energy plants and the recycling rates are at an all-time high
of 60%. The European Union has set a target of 50% waste recycling to be
achieved by 2020. In Germany, this target has been already met with 62% of
their waste being recycled as of 2010. The target for biodegradable municipal
waste, set for 2016, was met in 2006. Both Germany and Singapore have displayed
exceptional capacities in waste handling by following one simple methodology:
reduction in amounts of landfills and a move towards incineration as final
disposal. Also, an increased stress reduction and recycling of wastes- looking
at disposal as a final option.
Potatoes From Briny Soil, Netherlands
Approximately
70% of the world's freshwater is used by the agriculture industry. Studies have
shown that the worldwide salinisation of agricultural land will escalate under
the influence of climate change. To combat this issue, the research facility
'Tested on Texel' in Netherlands is testing the possibility of agriculture
under salty conditions. The research focuses on cultivation of vegetation,
including potatoes, in briny soil. The 'briny potato' has a very rich mineral
composition and an exceptionally good taste. Similar projects have been started
in Egypt.
Water Square, Netherlands
Only
about 50% of the land in the Netherlands exceeds one metre above sea level and
most of the area below sea level is manmade. Netherlands is a very densely
populated country with insufficient land available to combat the increasing
frequency as well as intensity of rains. The idea of water squares was
conceived to compensate for the unavailability of land to harvest rainwater. A
multifunctional water square has been created in the city of Rotterdam with
temporary rainwater catchment area at the square and a special public area for
the citizens.
Ajinkya Puranik