C Shivakumar
Chennai:
As North Chennai is set to witness a massive industrialization after
Union Ministry of Environment and Forests lifted the ban on new
industries in Manali, Chennai Metro Water is now banking on Singapore
model of reuse of treated waste water to fulfill the need of
industries.
A Senior Metro Water official told Express that the proposal to have
45 MLD capacity of TTRO plant in seven acres of land will provide
supply to 34 industries besides fetching a revenue of Rs 74 crore to
Metro Water per annum.
Currently, 36 MLD of secondary treated effluent is supplied to
industries through which revenue of Rs 15 crore per annum is
generated.
The project is expected to save fresh water from rain fed lakes from
where industrial hubs are presently receiving water so as to enable
metro water to augment city water supply by equivalent quantity.
“We are planning to invite tenders during September 2014 and it is
planned to get it done in two years from the date of work order,” the
official said.
The official said that water intensive industries are shaping up in
Manali-Ennore and Manali-Minjur corridors. These include TIDCO
initiative for promoting a joint venture with Indo-Rama Synthetics for
a new petrochemical project and a plastic industrial estate for a
forward integration initiative besides LNG Terminal at Ennore Port and
brown field refinery by CPCL.
Interestingly, Chennai Metro Water had conducted a survey through
ITCOT Consultancy on industries on anticipated demand of water in
Manali-Ennore Corridor and Manali-Minjur Corridor. The survey revealed
that by 2015, a total of 30 MLD of water is required which could more
than double to 70 MLD by 2020. Currently, most of the industries in
these corridors do not have independent source of water and are
dependent on Metro Water for supplying of surface or treated water.
“Once the project is completed, we will be supplying TTRO water of
good quality. The quality of water matches with the potable water
quality with turbidity less than 5, hardness less than 100 mg per
litres and TDS less than 70 mg per litre and zero iron level, the
official stated.
Interestingly, the initiative has been a success in Singapore. Termed
as NEWater or reclaimed water, it is produced from treated used water
which is further purified using advance membrane technologies abd
ultraviolet disinfection making it clean and safe to drink.
How does the tech work:
1. Pre-treatment: The first stage consists of removal or reduction of
suspended particulate matters and removal of impurities which are
harmful for reverse osmosis system.
2. Ultra filtration: The second stage will remove residual micro
impurities which are still slipping through previous filtration
stages.
3. RO: It separates molecular impurities from water thus making one
stream rich in salt molecules and other stream lean in salts thus
reducing TDS of water.
Benefits of TTRO plant:
1. Supplies industrial grade water to industrial hubs to ensure
sustainable supply and superior quality of water.
2. Realise revenues from the waste water to meet expenditure towards
treatment of waste water
3. Frees up potable water for domestic consumption
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