MUMBAI
The Brihanmumbai Municipal Corporation has decided to introduce recycling of grey water in a bid to tackle the city’s water woes.
The Brihanmumbai Municipal Corporation (BMC) has decided to introduce recycling of grey water in a bid to tackle the city’s water woes. This water, however, would only be used for non-potable purposes. The BMC has short-listed the firm VA Tech Wabag, who have vast experience in the field. The firm has also set up plants at Chennai and Panipat. Rajiv Mittal, managing director of VA Tech Wabag, speaks to DNA about the benefits of setting up such a plant.
What is desalination and would it really help Mumbai overcome its water woes?
Desalination is a scientifically proven technology to recycle used water. The water obtained this way is as pure as natural water. There are two methods of desalinating grey water as well as sea water. One method used worldwide is reverse osmosis. The other is the thermal process. A city like Mumbai has enough water sources as of today, but if you look at the growing population of the city, natural sources will not be able to sustain the water needs of the city. At the time, this will be the only way to reuse water.
But, it is a costly process. Can the common Mumbaikar afford it?
This year, the city faced the worst water woes ever. In such crucial situations many societies used tanker water for non-potable purposes. Each tanker costs about Rs1,200 to Rs1,500 for one thousand litres. The cost of recycled water is not much higher than tanker water. Normally, recycled water costs Rs40 to Rs50 per thousand litres, which is not that high.
Don’t we have to lay new pipelines and amend infrastructure to distribute this recycled water? Won’t that also push up the cost of water?
No, the cost wouldn’t be higher than the cost of normal water supply. Though there is a need for another water supply source, it is a one-time investment and there are no recurring expenses.
Will Mumbaikars use the water procured from grey water? What have you noticed in the other states where you have installed such a plant?
Normally, human beings are very reluctant to consume purified grey water. But, we can use it for industrial purposes, which will reduce the load on potable water. If we use this water for non-potable purposes, then potable water or natural water could be used only for consumption.
Can you scale up the project to provide water to all of Mumbai?
We are setting up a plant at Ghatkopar for the Brihanmumbai Municipal Corporation. The total cost of the project is Rs1,033 crore and will have a capacity of 100 million litres a day (MLD), or 10 crore litres a day. The plant will be constructed on DBO (design, build and operate) and will be commissioned in the next 24 months. The scope also includes a seven-year contract for operations and maintenance.
How will your company benefit by setting up a desalination plant in Mumbai?
Well, we are going to set up such a plant in Mumbai for the first time. It is among our biggest projects till date. If there is infrastructure, the city can survive even when the population increases because the water needs will always rise. Our firm has a complete range of sea and brackish water desalination technologies. In 20 years the company has designed, installed and successfully commissioned over a 100 plants globally.
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