Featured Research

from universities, journals, and other organizations

No Trouble Removing Oil From Water

Date:
August 5, 2005
Source:
Research Australia
Summary:
A simple tank-and-siphon system for removing oil from oily water and protecting the environment is about to be launched internationally by an engineering team from the University of New South Wales.

A simple tank-and-siphon system for removing oil from oily water andprotecting the environment is about to be launched internationally byan engineering team from the University of New South Wales.

Related Articles


The Extended Gravity Oil Water Separation (EGOWS) concept is animprovement on the industry-standard American Petroleum Institute (API)gravity separator that has been widely used for the last 60 years.

The API separator, originally designed for oil refineries, isnot designed to reduce the oil content of water below about 100 partsper million and is not suitable for releasing water directly to theenvironment.

Regulatory requirements for the release of oil-contaminatedwater to the environment are becoming stricter worldwide. It is commonfor environmental protection authorities to impose a limit of 10 partsof oil per million of effluent water, and increasingly for there to beno visible sheen on the receiving water.

Although other systems can achieve low effluent oil contents,they tend to be more energy intensive and incur higher costs,particularly for ongoing maintenance, says David Tolmie, who developedEGOWS with colleague Peter Stone from the University's Water ResearchLaboratory in the School of Civil and Environmental Engineering.

"EGOWS can removes oil down to below 10 parts per million,requires no power and is most useful in situations that areunattended," says Mr Tolmie. "Most of the EGOWS installations to datein Australia have been in electricity substations to eliminate thesmall but potentially disastrous risk of a major spill of oil to theenvironment."

The system's secret lies in its ability to take episodicinflows of oily water and extend the time it spends in the separatortank.

Because oil is less dense, it rises to the surface of thewater. The more time given to effluent water in the separator, the moreoil that can be separated. EGOWS achieves a separation time of days inthe tank as opposed to 20 or 30 minutes in an API separator.

This is achieved by arranging for the separator to be in apartially emptied state before the arrival of episodic inflows of oilywater. When the separator is full, water is released automaticallyusing a siphon that involves no mechanical devices or powerrequirements.

Oily water inflows are accumulated progressively, with norelease of water until it reaches a siphon priming level. APIseparators and other separators that operate full of water , releaseequal quantities of water as soon as there is an episodic inflow ofoily water, creating the risk that oil droplets can escape into theseparator outlet.

Tolmie and Stone began researching their concept back in thelate 1990s when Energy Australia asked them to review their oilseparator systems.

"We were looking for a simpler way of doing things," saysTolmie. "One way is to make the tank bigger -- and that works -- but werealised we could use the existing API separators more productively.The beauty of our concept is that existing systems can be retrofittedwith relative ease."

New South Innovations, the commercialisation arm of UNSW, hassince patented the concept and successfully licensed it to Australiancompanies. . Energy Australia estimates their EGOWS system could savethe company $18 million in 10 years. Caltex Australia has installed twoEGOWS units which they describe as innovative and highly effectivesolutions to their stormwater treatment requirements.

New South Innovations has obtained patents in America, Europe,New Zealand and parts of Asia and is actively looking for potentialinternational licensees.

"The cost of an oil spill clean up can be many times the costof a separator which will contain the oil spill automatically," saidTolmie.

EGOWS is suitable for use with episodic inflows of oil or oilywater in such places as electricity substations, oil storages,transport and container terminals, highways and ports.



Story Source:

The above story is based on materials provided by Research Australia. Note: Materials may be edited for content and length.


Cite This Page:

Research Australia. "No Trouble Removing Oil From Water." ScienceDaily. ScienceDaily, 5 August 2005. <www.sciencedaily.com/releases/2005/08/050805110230.htm>.
Research Australia. (2005, August 5). No Trouble Removing Oil From Water. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2005/08/050805110230.htm
Research Australia. "No Trouble Removing Oil From Water." ScienceDaily. www.sciencedaily.com/releases/2005/08/050805110230.htm (accessed October 30, 2014).

Share This



More Earth & Climate News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Mudslide in Sri Lanka Buries Houses

Deadly Mudslide in Sri Lanka Buries Houses

AP (Oct. 29, 2014) A mudslide triggered by monsoon rains buried scores of workers' houses at a tea plantation in central Sri Lanka on Wednesday, killing at least 10 people and leaving more than 250 missing, an official said. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Galapagos Tortoises Bounce Back, But Ecosystem Lags

Galapagos Tortoises Bounce Back, But Ecosystem Lags

Newsy (Oct. 29, 2014) The Galapagos tortoise has made a stupendous recovery from the brink of extinction to a population of more than 1,000. But it still faces threats. Video provided by Newsy
Powered by NewsLook.com
Saharan Solar Project to Power Europe

Saharan Solar Project to Power Europe

Reuters - Business Video Online (Oct. 29, 2014) A solar energy project in the Tunisian Sahara aims to generate enough clean energy by 2018 to power two million European homes. Matt Stock reports. Video provided by Reuters
Powered by NewsLook.com
Obama: The US Will Not 'run and Hide' From Ebola

Obama: The US Will Not 'run and Hide' From Ebola

AP (Oct. 29, 2014) Surrounded by health care workers in the White House East Room, President Barack Obama said the U.S. will likely see additional Ebola cases in the weeks ahead. But he said the nation can't seal itself off in the fight against the disease. (Oct. 29) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins