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35%), and increases gas production (about
10-12%). Ultimately, it delivers a high quality
(Class A) end product (biosolids).
The end product is a pathogen free and
pasteurized biosolids with minimum odour
which can be applied to land directly as bio
fertiliser. The estimated sludge generation
from the existing and new plant is about
24,000 tonnes dry solids (DS) per year. The
Class A Bio solids has commercial value as it
is used as a fertiliser and hence it generates
revenue to the authority.
This is the first time in India that this
technology (THP) is recommended for
municipal STP. The THP technology is used
in some leading developed cities such as
Washington DC, USA with capacities of
130,000 tonnes DS/year, Manchester UK with
91,000 tonnes DS/year, Oslo Norway with
50,000 tonnes DS/year and London, UK with
40,000 tonnes DS/year, among others.
Technovation
Energy recovery from the sludge helps reduce
green house gas emissions. The waste to
energy solution, is designed to contribute to
about 35% of the total energy requirement
for the operation of sewage treatment plant.
The utilization of biogas for power generation
causes reduction in emission of methane gas,
qualifying as a Clean Development Mechanism
project with eligibility for carbon credits. Since
the energy recovery from sewage treatment
plants is of the nature of ‘non conventional’ i.e.,
‘renewable energy source’, it is eco friendly
and increases sustainability. The estimated
carbon trading price from the proposed
sewage treatment plant is approximately
`
4.61
crores per annum.
With this sustainable project, TCE provided
value to its client by retrofitting STP for
augmented capacities with limited available
footprint (plant premises) and provided
advanced sludge treatment for handling large
volume of sludge generated from the existing
and new plant with better sludge quality for
land applications in limited footprints. The
project implementation period is estimated
at 36 months including trial run, testing and
commissioning.
This project will set the benchmark for
other mega cities in India as a smart, value
engineering solution to handle large volume
of sludge from the sewage treatment plants .
Waste to energy, from liquids and solid wastes,
are sustainable in the long run with state-of-
the-art solutions designed to provide long term
sustainability.
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