Envirobot, the latest biomimetic fabrication by Swiss researchers, appears as a water snake
Its job when fully developed will be to guard water bodies looking for pollution and toxins
Envirobot is better than conventional propeller-driven underwater robots as it is less likely to get in branches and algae when they move around
Switzerland, August 6, 2017: As per the Pacific Institute, more than 2 million tons of a wide range of waste is pumped into the world’s waters each day. Researchers have become great at recognizing it, however not very great at finding the source of pollution. However, Envirobot, the latest biomimetic fabrication by Swiss researchers, provides a solution.
It appears as a water snake but is actually a collection of little segments, all doing different jobs. They are taking it on a test drive around bodies of water in search of toxins and other substances which can harm aquatic animals in order to take control of water pollution.
The segments of Envirobot are identical so that the joint can oscillate in water. The head coordinates the motion of different segments in order to create a serpentine pattern which propels the whole robot. Its job when fully developed will be to guard water bodies on its own looking for pollution and toxins.
It can also send data to computers in real time as it swims. Its tiny chambers get filled with water as the robot swims through water. Envirobot is more efficient and accurate as it can collect water from multiple spots in a lake or river. It will be used as a measure to detect metals as they can harm people and aquatic life.
Instead of having a measurement station somewhere or going out to take a sample and bringing it back to the lab, the robot will actually slither in water bodies and measure a number of water quality parameters in real time. Envirobot is better than conventional propeller-driven underwater robots as it is less likely to get in branches and algae when they move around.
Each segment of the Envirobot is unique so as to enable it to perform all kinds of water tests at the same time. For instance one segment measures very general quality parameters like temperature, conductivity, pH, oxygen level, so as to say whether water quality is good or not. Other segments carry bacteria, fish cells and even tiny water fleas that can react to toxins and insecticides in the water body.
The researchers’ ultimate goal is to create a full-time autonomous pollution sniffing robot and prevention of water pollution. What they are yet to achieve is to enable the Envirobot to by itself locate the source of the pollution. This will help to measure and decide where to go next which is a very challenging project. Given the amount of waste that is being dumped or pumped into the world’s waterways, it is a very worthy goal.
– prepared by Harsimran Kaur of NewsGram. Twitter @Hkaur1025
Delhi to get India’s first ever recycle wastewater treatment plant, after it became significantly popular in Singapore and Orange County
Sujala Dhara plant set up by Absolute Water, in collaboration with Delhi Jal Board and SANA
Non-potable use of the treatable water to be promoted extensively by Delhi Government
New Delhi, August 3, 2017: The capital has been suffering a water crisis for a while now, it was only a while back that a report warned the residents that 70 percent of the water in the capital was polluted and unfit to drink. After the spike in the industrial pollutants in the Yamuna river forced the Delhi Jal Board to take action by cutting 50 percent of water supply from two major water plants in Delhi.
After the reports were verified, it was evident that most of the water that the locals were consuming was diluted wastewater. There have been many short term preventive measures already been taken but in the long run, people are still unwilling to consume the recycled wastewater, even though half of the consumption currently is polluted by industrial and chemical waste.
The founder of Third World Center for Water Management said in an interview that, in Singapore, over 50 lakh residents have accepted it as a solution. Dependent on Malaysia for up to 50 percent of its water, Singapore decided that it was better to be self-reliant. With this ‘NEWater treatment plants’, it has not only managed that but also become a hub for advanced water research. A similar effort is also being done on an extensive scale in Orange County Water District in the US.
Rahul Jha of Absolute Water, the water wing of Chemical System Technologies says that “Astronauts do it abroad stations”, Absolute Water develops technology which renders wastewater into potable water. In collaboration with Delhi Jal Board and Social Awareness, Newer Alternatives (SANA) they have established a plant called Sujala Dhara, at the Keshopur Sewage Treatment Plant in July 2015. At a cost of Rs 55 lakh, this plant can produce over 4000 liters of clean water every hour. The plant will be monitored by Delhi Jal Board, while agencies like Central Pollution Control Board have already given it a go.
The wastewater purification process not only reduces the waste discharged into the river bodies but also amounts to 15 percent of raw water remaining after purification, which is rich in nutrients like potassium and nitrogen and can be used as a liquid fertilizer. Even though the people are not yet accepting of this method of purification in India, and the practice won’t be as widely popular as it is in Singapore but the recycled water can be used for domestic needs.
Work is initiated to supply the plant water to Keshopur Bus Depot for washing vehicles. The water will also be provided to the residence of Delhi Jal Board officials who live close to it, and where work on the dual piping system is proposed. So, two completely separate systems will be used to supply potable and recycled water to the users.
While there isn’t much heat on the aggressive consumption of recycled wastewater for drinking, but the Delhi’s Master Plan 2021 is already underway to promote extensive use of treated water for non-potable purposes.
–Prepared by Nivedita Motwani. Twitter @Mind_Makeup
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The global use of untreated wastewater from cities to irrigate crops downstream is 50 per cent more widespread than previously thought
The study relies on advanced modelling methods to provide a comprehensive estimate of the global extent to which farmers use urban wastewater on irrigated cropland
Results showed that 65 percent of all irrigated areas are within 40 km downstream of urban centres and are affected by wastewater flows to a large degree
Colombo, July 06, 2017: India and four other countries – China, Pakistan, Mexico and Iran — account for the most cropland in the world irrigated by dirty wastewater, putting millions of lives at serious health risks, new research have found.
The global use of untreated wastewater from cities to irrigate crops downstream is 50 per cent more widespread than previously thought, according to the study published in the journal Environmental Research Letters.
The study relies on advanced modelling methods to provide a comprehensive estimate of the global extent to which farmers use urban wastewater on irrigated cropland.
Researchers analysed data with geographic information systems (GIS).
According to the study, farmers’ use of wastewater is most prevalent in regions where there are significant wastewater generation and water pollution.
In these circumstances, and where safer water is in short supply, wastewater offers a consistent and reliable means of irrigating fields, including high-value crops, such as vegetables, which often require more water than staple foods.
Where raw wastewater is available, farmers may tend to prefer it because of its high concentrations of nutrients, which can lessen the need to apply purchased fertilisers.
In most cases, however, farmers’ use of this water is motivated by basic needs. They simply do not have alternatives, the study showed.
“The de facto reuse of urban wastewater is understandable, given the combination of increasing water pollution and declining freshwater availability, as seen in many developing countries,” said the lead author of the study Anne Thebo from the University of California, Berkeley in the US.
“As long as investment in wastewater treatment lags far behind population growth, large numbers of consumers eating raw produce will face heightened threats to food safety,” Thebo said.
Results showed that 65 percent of all irrigated areas are within 40 km downstream of urban centres and are affected by wastewater flows to a large degree.
Of the total area of 35.9 million hectares, 29.3 million hectares are in countries with very limited wastewater treatment, exposing 885 million urban consumers as well as farmers and food vendors to serious health risks.
Five countries — China, India, Pakistan, Mexico and Iran — account for most of this cropland, the findings showed.
These new findings supersede a widely cited 2004 estimate, based on case studies in some 70 countries and expert opinion, which had put the cropland area irrigated with wastewater at a maximum of 20 million hectares.
“Gaining a better grasp of where, why and to what extent farmers use wastewater for irrigation is an important step toward addressing the problem,” said second author Pay Drechsel of the International Water Management Institute (IWMI), Battaramulla, Sri Lanka.
“We hope this new study will focus the attention of policymakers and sanitation experts on the need to fulfill Sustainable Development Goal 6, particularly target 3, which calls for halving the proportion of untreated wastewater and increasing recycling and safe water reuse,” Drechsel added. (IANS)
SALISBURY, NORTH CAROLINA, Nov 20, 2016:Ravens fly over a sprawling, abandoned brick building with tall chimneys that once billowed plumes of smoke day and night.
In its heyday, the coal-fired plant continuously produced 370 megawatts of electricity, with each megawatt able to power a thousand households. But its last coal-fired units were shut down a few years ago. Piles of coal are long gone.
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Across the compound here in the center of this mid-Atlantic state, three noisy turbines churn at a new natural gas-fired plant that produces 620 megawatts. The Buck Combined Cycle power station stands at the edge of the Yadkin River—and amid a wave of change in the energy industry.
Both plants are owned by Duke Energy, a company with holdings in the United States and Latin America.
Like other U.S. energy firms, it is responding to growing demand for cleaner energy and tighter restrictions on carbon emissions. American firms are being compelled to reduce their dependence on coal in favor of much cleaner fuel sources.
Bill Wilson, senior engineer at the Buck Combined Station, said Duke has retired about half of its coal-fired facilities in recent years and replaced them with natural gas facilities like this.
“Due to the current price of natural gas, it is much cheaper,” he explained. “So on a megawatt basis, it is cheaper to run natural gas than coal.”
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It costs between $15.30 and $17.30 per megawatt hour (MWh) for natural gas, while coal costs about $28 per MWh, Duke Energy spokeswoman Tammie McGee said. “So, in today’s markets, our natural gas generation does provide lower costs and savings to our customers,” she added.
Duke Energy plans to phase out most of its U.S. coal plants in next few decades.
The shift also is evident in other energy companies across the country.
For decades, coal was the main fuel source for generating power in the United States. Last year, natural gas matched it, with each producing a third of the nation’s electricity, according to U.S. Energy Information Administration figures. The other third came from hydropower, nuclear and renewable energy sources.
The administration had predicted that natural gas would overtake coal as the country’s biggest source of electricity this year, though this week it posted a storyheadlined, “Coal may surpass natural gas as most common electricity generation fuel this winter.”
About 200 miles northwest of Salisbury, in mountainous Russell County, Virginia, a couple of trucks and a bulldozer in July removed the last few tons of black coal from a field outside the Clinch River Coal Plant.
The plant’s three coal-fired units once produced up to 705 megawatts of electricity. But early this year, plant owner American Electric Power converted two of the units to gas and retired the third.
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The new units are not only cleaner, they are more efficient, plant manager Ricky Chaffin said. Now, the plant can produce 484 megawatts of electricity—averaging 242 megawatts per unit, up from the previous 235 each. And running it requires less labor.
“You don’t have to handle the coal,” Chaffin said. “You don’t have to move the coal from the pile to the plant.”
Also, natural gas is delivered via pipeline. “We have got a lot less equipment,” Chaffin added. “So it’s a whole lot less manpower required to run a gas plant.”
The shift in energy production has also brought change to the workforce. For instance, when American Electric Power switched from coal to gas, the number of people needed to run the plant dropped from 182 to 46.
But there’s been employment growth in renewable energy. The National Solar Jobs Census reported the solar energy workforce grew by more than 20 percent in 2015.
In North Carolina’s Union County, Duke Energy has hired roughly 500 people to construct a solar field spreading over 156 hectares of farmland that used to grow corn and soybeans. Workers are installing 663,800 solar panels on the solar farm, expected to produce 60 megawatts of electricity when it becomes operational next year.
“We have customers who are demanding renewable energy, and we do have energy policies that we are working toward complying with,” said McGee. She said the company has more than 50 solar projects in operation nationwide, and 19 wind-powered projects generating electricity. One more wind site is expected to come online in December.
Renewable energy sources supplied roughly 13 percent of U.S. energy produced last year, according to the Energy Information Administration. Of that, 6 percent was from hydropower, 5 percent wind, 2 percent biomass and 1 percent solar.
While big energy companies are phasing out coal, their environmental challenges are far from over.
Last month, Duke Energy reached an agreement to clean up coal ash from its Buck Steam Station. (VOA)