Artemis Water Strategy

Water resilience for a thirsty future

Aug 02 2010

Desalitech Reduces Costs of Desalination

Middelgrunden Windmills Outside Copenhagen
Efficient desalination can utilize alternative energy, like these Danish windmills, thus relying on the ocean twice. / Photo: andjohan on Flickr

The most common question I field when I mention desalination is, “Doesn’t that take a lot of energy?”

The truth is, yes, it does. That’s why you’ll not hear me advocate for desalination without strongly insisting on complementary conservation.

We must redouble our conservation efforts by upgrading infrastructure intelligently and in no way excuse wasteful water practices by pointing to the plentiful, historical ingredients of desalination: oceans of water and oceans of coal.

Each barrel of freshwater extracted from the ocean has costs, so we should use the water as efficiently as possible, recycling it and then remediating it into the water cycle.

Yet, conservation alone isn’t going to meet our water needs. The world’s population is expected to increase by 2.5 billion over the next 30 – 40 years, while the current, natural water cycle is not expected to increase its output.

Just as we must increase conservation, we must prepare for the impending water plateau by increasing our capacity to produce fresh water.

Hence my excitement in June when I heard about Desalitech’s successful pilot.The test purified Mediterranean saltwater, using Desalitech’s proprietary Closed-Circuit Desalination saltwater reverse osmosis method (SWRO-CCD).

Using common components, without energy recovery, running a high-pressure pump at 81% mean efficiency and circulation pump at 37.5% mean efficiency, the pilot achieved 48% recovery at 2.05 – 2.40 kWh per cubic meter of fresh water. For comparison, Perth’s desalination plant using Energy Recovery from ERI achieves 43% recovery at 2.32 kWh/m3.

Desalitech aims to increase the mean efficiency of the off-the-shelf, high-pressure pump to 88%, to provide recovery at 1.75 – 1.95 kWh/m3 on Mediterranean saltwater. The same pumps used on ocean water could produce equal recovery at 1.5 – 1.7 kWh/m3.

Desalitech’s implementation reduces the cost of powering desalination processes. It also decreases capital expenditures. Nadav Efraty, CEO of Desalitech, told me, “This technology is reducing energy consumption by up to 50% when we utilize about twice the membranes, reduces energy by about 10-15% when we use only 40% of the membranes compared to a conventional plant, or reduces energy about 30% when we utilizes the same amount of membranes, but in this mode, since we don’t utilize any form of energy recovery, we still see a reduction in capital expenditures.”

Even with less than half the membranes, the technology still sees 10-15% energy reduction. That’s a 60% savings on capital expenditures for membranes.

As an added element of efficiency, plants utilizing Desalitech’s technology can turn plants up and down depending on demand: Nadav explained, “The very same unit can operate at very high production rates part of the day (when power rates are low for example) and in extremely low energy consumption the rest of the day.”

Desalitech does this by independently controlling component flow rates, recovery, pressures and cross flow irrespective of the other variables.

Following their successful pilot, Desalitech is addressing brackish water. Desalitech’s three BWRO installations are fully operational facilities, capable of producing 10,000 m3 fresh water per day.

 

Written by Laura Shenkar · Categorized: Commentary, Conservation, Desalinization, Drinking Water, Energy, News · Tagged: brackish water, conservation, desalination, desalitech, energy, ERI, freshwater, Israel

Jul 27 2010

Market Driven Tree Hugging

A helicopter pours water on Californian wildfires in 2009 / Photo: kevindean on flickr
A number of small buckets of water can contain a wildfire / Photo: kevindean on flickr

Climate legislation in the United States just went up in a cloud of CO2. Again.

Which doesn’t for one second mean the battle is lost.

Regulation may have failed, but thankfully, the free-market surrounding water isn’t waiting for regulations to change. The BlueTech sector is already in position with profitable solutions to mitigate climate change.

The inefficient transportation and treatment of water from source to end-user accounts for 13% of energy use in the United States (and 17% in water-starved California).

As we reported earlier this year, the Carbon Footprint of Water Report calculated that a 5% decrease in infrastructure leaks in the United States would save 270 million gallons of water a day and 313 million kilowatt hours of electricity annually — enough to power 31,000 homes. Not only that, but it’d keep 225,000 metric tons of C02 emissions out of the air.

Meanwhile, cities like Pittsburgh, St. Louis and Seattle are introducing plans to replace aging infrastructure, to the tune of nearly $5 billion. Which is only a portion of the estimated $335 billion national pricetag.

It’s a perfectly timed confluence of events: we’re facing a global crisis. The inefficient water complex – which bears some responsibility for the crisis – is due for an upgrade. Simultaneously, innovation in water efficiency has bloomed.

Throughout the country the BlueTech industry is poised to offer municipalities and water authorities cost-savings and reduced costs to upgrade infrastructure via smart-water systems, efficient water-treatment and stormwater management, and positive revenue streams through resources recovered from waste streams.

As water supply ceases to match demand, new desalination technologies can replace ancient systems to achieve excellent energy efficiencies – often with decreased capital expenditures.

Each of these methods mitigates the causes of climate change by making efficient use of water, thereby making efficient use of energy. Efficient energy use reduces fossil fuel extraction (thereby reducing water usage still further) and reduces the release of pollutants like CO2 and mercury into the atmosphere and water supply.

And each of these methods reduces costs for implementers, either by reducing capital expenditures or by reducing operational costs. They’re a win for the economy and a win for the environment.

To be sure, it’d be helpful if Congress would expedite adoption of clean technology by establishing a firm price signal for pollution. But as American politicians have repeatedly refused, the free market is ready to manage the growing climate and water crises, with or without Congress.

 

Written by Laura Shenkar · Categorized: Commentary, Desalinization, Investments, News, Resource Recovery, Smart Water, Stormwater, Wastewater Treatment · Tagged: carbon, climate legislation, congress, ERI, free-markets, market drivers, regulations, smart water

Jul 06 2010

Desalination Spending to Double

Azzizia Desalination Plant, Saudi Arabia
Azzizia Desalination Plant in Saudi Arabia / Photo: Waleed Alzuhair on Flickr

Here’s some good news for advanced desalination technology companies.Worldwide desalting capacity is projected to increase by 50 million cubic meters per day over the next six years, according to a recent study by Pike Research.Meanwhile, annual spending on desalination will double by 2016, from $8.3b to $16.6 billion. Spending will total $87.8 billion during that time period. [Read more…]

Written by Laura Shenkar · Categorized: Commentary, Desalinization, Energy, Investments, Trends · Tagged: aqua via, china, desalination, desalitech, ERI, forward osmosis, HTI, Israel, Oasys, reverse osmosis, Rotec, Saudi Arabia, UAE, USA

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