Archive for November, 2010

Some facts of desalination

November 29, 2010 Leave a comment
    • It is estimated that some 30% of the world’s irrigated areas suffers from salinity problems and remediation is seen to be very costly.
    • In 2008 there were more than 13,000 desalination plants around the world in 120 countries. They produce some 63.48 million m3/day of freshwater.
    • Global desalination investment total amount up to 24.8 billion us dollars and increased 20% to 30% per year.
    • It is estimated that there total 70 billion us dollar market in future 20 years, and china market share will get a quick increasing.
    • The most important users of desalinated water are in the Middle East, (mainly Saudi Arabia, Kuwait, the United Arab Emirates, Qatar and Bahrain), which uses about 70% of worldwide capacity; and in North Africa (mainly Libya and Algeria), which uses about 6% of worldwide capacity.
    • Saudi Arabia plants take about 24% capacity of world desalination. The biggest desalination plant is JEBEL ALI desalination plant in UAE which  produce 300 million m3/day.

      Water Ozone mixing

      November 25, 2010 2 comments

      SS ozone/water blender

      High Performance Ozone/Water  SS  blender

      How it works

      The turbulent flow produce negative pressure and absorb the ozone into the blender, special designed internal  structure make the sinuous flow swirling and striking in the tube, our experience proved that the solubility is double than Venturi tube when mixing ozone and water.






      The pressure at "1" is higher than at "2" because the fluid speed at "1" is lower than at "2".Venturi effect is the reduction in fluid pressure

      The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The Venturi effect is named after Giovanni Battista Venturi (1746–1822), an Italian physicist.

      SWRO Energy Recovery

      November 22, 2010 Leave a comment




      Energy recovery device is an energy exchanger, which transfer the pressure of  waste water/drain water to feeding water, efficiency rate can be up to 89% to 96%. This technology made the RO desalination as the lowest energy consumption solution, comparing with ED, MED, MFS.

      Detailed working process, please see this









      Tiny bubbles clean oil from water

      November 12, 2010 Leave a comment

      Tiny bubbles clean oil from water

      Microbubbles in a chemical reactor like the one shown here are crucial to a new method for cleaning up oil sheen and other pollutants released into water from oil drilling, refineries, mining of tar sands and oil, leaking underground gasoline tanks and other sources. Civil and environmental engineering Professor Andy Hong developed the method, which puts a new twist on two conventional techniques: bubbling ozone gas through polluted water and then filtering the water through sand. Hong’s method uses repeated cycles of pressurizing and depressurizing ozone to create microscopic bubbles that are much more effective than larger bubbles at converting and removing oil. Credit: College of Engineering, University of Utah.

      Small amounts of oil leave a fluorescent sheen on polluted water. Oil sheen is hard to remove, even when the water is aerated with ozone or filtered through sand. Now, a University of Utah engineer has developed an inexpensive new method to remove oil sheen by repeatedly pressurizing and depressurizing ozone gas, creating microscopic bubbles that attack the oil so it can be removed by sand filters.

      “We are not trying to treat the entire hydrocarbon [oil] content in the water – to turn it into carbon dioxide and water – but we are converting it into a form that can be retained by sand filtration, which is a conventional and economical process,” says Andy Hong, a professor of civil and environmental engineering.

      In laboratory experiments reported online this week in the journal Chemosphere, Hong demonstrated that “pressure-assisted ozonation and sand filtration” effectively removes oil droplets dispersed in water, indicating it could be used to prevent oil sheen from wastewater discharged into coastal waters.

      Hong says the method – for which patents are pending – also could be used to clean a variety of pollutants in water and even soil, including:

      • So-called “produced water” from oil and gas drilling sites on land. Such oily water normally is re-injected underground. “If we have technology to clean it, it could be put into beneficial uses, such as irrigation, especially in arid regions where oil and gas tend to be produced,” says Hong.
      • Water from mining of tar sands and oil shale.
      • Groundwater contaminated by MTBE, a gasoline additive that reduces harmful vehicle emissions but pollutes water due to leaking underground gasoline storage tanks.
      • “Emerging contaminants,” such as wastewater polluted with medications and personal care products.
      • Soil contaminated with polychlorinated biphenyls (PCBs, from electrical transformers) or polycyclic aromatic hydrocarbons (PAHs, from fuel burning). Water and contaminated soil would be mixed into slurry, and then treated with the new method.
      • Heavy metals in soil. Instead of ozone, air and metal-grabbing chelating agents would be pressurized with a slurry of the contaminated material.
      • Refinery wastewater and oil spills at refineries or on waterways. The spill could be vacuumed, and then treated with the new method on-site or on a barge.

      Hong conducted the study with two University of Utah doctoral students – Zhixiong Cha, who has earned his Ph.D., and Chia-Jung Cheng – and with Cheng-Fang Lin, an environmental engineering professor at National Taiwan University.