Tag Archive for 'water treatment'

The best wastewater treatment plants can’t filter out superbug fragments

The best wastewater treatment plants can't filter out superbug fragments

Retrieved from: MedicalXpress

“The implications are unclear — researchers did not look for whole living , just for dead fragments of their  — but experts are concerned. Superbugs have developed resistance to almost every kind of antibiotic. They are building resistance faster than science can create . Many of them are deadly.

“Timothy LaPara and a team of researchers at the University of Minnesota in the Twin Cities, testing water pouring from a modern water treatment facility in Duluth, found genes of  in the discharge. Most American cities do not have facilities as good as Duluth’s, but no one knows for sure how much worse the situation may be at those facilities because it has not been measured.

“This is not a trivial thing to miss,” said Ellen Silbergeld, professor and editor-in-chief of Environmental Research at the Johns Hopkins Bloomberg School of Public Health. Silbergeld said LaPara shows the situation is more troubling than many had thought.

“The best-known superbug is MRSA, , which even has been found in the locker room of a  team but usually picked up in hospitals. It is sometimes defeated by massive doses of multiple , but not always.

“A new superbug, Clostridium difficile, which can cause a fatal colon inflammation, now is on the rise. Two antibiotics work for that bug most — but not all — of the time. A quarter of patients relapse and some will die.”

Read more: MedicalXpress

 

Ground Glass Solution for Cleaner Water

retrieved from: sciencedaily.com

“British science has led to a use for waste glass that cannot be recycled that could help clean up polluted waterways by acting as an ion-exchange filter to remove lead, cadmium and other toxic metals.

“Only a fraction of waste glass bottles and jars can be recycled, partly because much of the glass is coloured, brown or green, and partly because the market sustains only a limited weight of recyclable glass. Millions of tonnes of waste container glass are generated across Europe. As such, large amounts of waste glass, purportedly for recycling, are shipped to China and elsewhere to be ground up and used as hardcore filling materials for road building.

“Now, Nichola Coleman of the University of Greenwich, London, has developed a simple processing method for converting waste container glass, or cullet, into the mineral tobermorite. Tobermorite is hydrated calcium silicate, silicate being the main material that can be extracted from glass. In the form produced, the phase-pure 11-angstrom form — the mineral can be used as an ion-exchange material that can extract toxic lead and cadmium ions from industrial effluent, waste water streams or contaminated groundwater.”

Read more: Science Daily

Chlorine’s importance in water treatment set to grow

Image courtesy of: icis.com

“AS THE world becomes more populous, water is becoming more scarce. There is strong growth potential for all types of water treatment technologies, but some could do better as countries bid to quench their thirst in a cheap and environmentally friendly way.

“The UN’s estimates (see map below, which shows projected global water withdrawal as a percentage of total water available) are based on its medium-population projections made in 1998. According to these, more than 2.8bn people in 48 countries will face water stress, or scarce conditions, by 2025. Of these, 40 are in West Asia (also known as the Middle East), North Africa or sub-Saharan Africa.

“Over the next two decades, population increases and growing demands are projected to push all the West Asian countries into water scarcity conditions.

“By 2050, the number of countries facing water stress or scarcity could rise to 54, with a combined population of 4bn – about 40% of the projected global population of 9.4bn. It is striking to note that even some developed nations, such as the US and many European countries will see more serious water scarcity by 2025. This could be one reason that some are already calling water the “new oil.”

“In order to arrive at the different qualities of water required for its various applications, and for the world to meet its goals, it must be treated. There are several different ways to do this, which are either combined or taken in isolation, according to each instance. Essentially, the aim is to remove, or in some cases reduce, the contaminants present in the water to bring it to an acceptable level for its required end use.”

read more: icis.com

Arab Company Agrobics Cleans Industrial Wastewater, Inspired By Olive Waste

“Sabbah explains the problems of the agriculture business: Even with good intentions, the most “organic” of farms produces waste – of the organic variety. Whether it’s a citrus fruit facility, olive press, or meat packing plant, any producer in the agro-industry must be mindful of plant and animal waste that’s flushed down the drain.

“If agricultural wastewater went straight to the wastewater treatment plant, the facility would just collapse.” In his search for ways to increase the effectiveness of biological reactors that digest organic materials in wastewater, Sabbah developed an idea for a system that could be a standalone or add-on to treat agricultural wastewater.”

read more: Green Prophet

Desalination, With a Grain of Salt

“The potential benefits of ocean desalination are great, but the economic, cultural, and environmental costs of wide commercialization remain high. In many parts of the world, alternatives can provide the same freshwater benefits of ocean desalination at far lower economic and environmental costs. These alternatives include treating low-quality local water sources, encouraging regional water transfers, improving conservation and efficiency, accelerating wastewater recycling and reuse, and implementing smart land-use planning.”

read more: Pacific Institute