Dear Shri Aditya Thackerayji
From news reports , I believe you have directed
government officers to prepare a report on setting up a 200 MLD desalination
plant on Gorai coast
While appreciating your concern, I urge you to direct
the officers concerned to go through this email in order to determine :
Ø Availability
of FUNDS ( Capital Cost ) required for an RO plant
Ø Operating
costs to produce 1 litre of drinking water
Ø Time
( years ) for construction
Ø Availability
of a cheaper alternate technology ( eg :
water from air, using solar power )
With regards,
Hemen Parekh / hcp@RecuitGuru.com / 30
Oct 2020
===================================================
Context :
BMC
revives plan to set up desalination plant for potable water / 27
Oct 2020
Extract :
Ø
Later in
2016-17, the BMC had initiated the process to set up two desalination plants….However,
later, the project was put on hold
due to high cost.
Ø P Velrasu, additional municipal commissioner (AMC), BMC, said,
“The cost for a desalination plant has been optimised because of evolution of
technology. The cost of construction of the plant is the same as that of a dam.
It is estimated to cost around Rs 1,800 crore to construct a 200 MLD
plant.”
Ø The civic body supplies 3,750 million (m) litres (l) of water
daily, as compared to the demand of 4,200 ml.
Ø Initially, a pilot project will be undertaken, which will cater to
5% of Mumbai’s drinking water needs, and
later the capacity will be successfully augmented to 200 MLD { 200 / 4200 = 4.76 %
! }
Ø “An Israeli company has been tasked to submit the feasibility
report, which was involved in a similar 650 MLD-capacity plant in Israel. It
will take around three years to construct the plant,” said Velrasu.
Ø Dubai is
the first city in the world to construct a desalination plant.
Ø
Chennai, which has three such plants, had constructed its first
project in 2003 that supplies 90 MLD of water to the city.
===================================================
Context :
Solar
System Can Pull Drinkable Water Directly From The Air / 14
Oct 2020
Extract :
Ø
By contrast, the new system can work at humidity levels as low as 20 percent and requires no energy input other than sunlight
or any other available source of low-grade heat.
Ø
The present production rate of about 0.8 liters of water per
square meter per day may be adequate for some applications,
===================================================
My earlier blog / email on this technological break-through
:
Water
above our heads ………………………………………………….. [ 29 Mar 2019 ]
Extracting
Water from Air : Now Electricity from Air ?......[ 18 Feb 2020 ]
Water
Water Everywhere ? Even in Latur ? [ 15 April
2017 ]
Deja Vu ? [
28 Feb 2018 ]
Indian
Water Warriors ? [
24 Mar 2018 ]
Water
Wars Are Looming ! [
09 June 2018 ]
===================================================
Here is what Gujarat had planned 2 years ago :
A
Desperate Measure ? ………………………………………………………
[ 18 Nov 2018
]
Extract :
Using Reverse Osmosis technology, plant will produce 100 million
liter of drinkable water per day [ 100
MLD ]
At what cost ?
My guesstimate :
Interest @ 15 % …………………………..
Rs 150 cr
Depreciation @ 10 %.....................
Rs 100 cr
Operating Expenses @ 20 % …………
Rs 200 cr
Total annual cost
…………………………… Rs 450 cr
Per day cost ( 365 days ) ……………….
Rs 1.23 cr ( Rs 12.3 Million
)
So , per liter cost …………………………… Rs 0.10 (
approx. )
===================================================
NOW STUDY THIS REPORT : The
Cost of Desalination
Extract :
Ø The average costs, represented by the best fit line in the data shown, are
about
> $ 0.70/m3 ($2.65 per thousand gallons = approx.. Rs 0.05 / litre )
for very large plants (325,000
> $ 1.25/m3 ($4.75 per thousand gallons) for small plants (10,000
m3/day).
===================================================
Find “ per litre cost of desalination “ of several plants
around the world , at :
===================================================
As to the desalination plants of Chennai , here are
some interesting facts :
Rs
1.36 crore a day for just 200 million litres of water; can Chennai really
afford desalination plants?( 07-03-2019)
{ ie: 6.8 paise per litre }
Data
shared by Chennai Metrowater Supply and Sewerage Department (CMWSSD) specifies
the breakup of the expenditure on various modes of procuring water as in the
table below:
|
Source |
Capital Cost per MLD (in Rs) |
O & M Cost per MLD (in Rs) |
|
Desalination plants |
15.30 crores |
68,000 |
|
Surface Water resources |
7.70 crores |
6000-23,000 (average of 14,500) |
===================================================
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