Spotted: If you have ever eaten a gumbo, you may be aware that one of the main ingredients—okra—is an excellent thickener. Researchers have recently discovered that the same extracts that make cooked okra gloopy can be used to remove microplastics from wastewater. Microplastics are, as the name suggests, pieces of plastic 5 millimetres or smaller. Studies suggest that these are now so prevalent they have been found on every continent and inside the human body – even inside the placenta of unborn babies.
Microplastics are typically removed from wastewater in a two-step process – by first skimming off any floating pieces, and then removing the rest using flocculants, ‘sticky’ chemicals that attract the microplastics and form large clumps that then sink to the bottom of the water. However, some common flocculants are themselves potentially harmful. For example, polyacrylamide, can break down into toxic chemicals. Instead, the researchers turned to non-toxic alternatives.
The team tested polysaccharide extracts from several foods, including fenugreek, cactus, aloe vera, okra, tamarind, and psyllium. They found that polysaccharides from okra combined with those from fenugreek worked best at clumping microplastics in ocean water, while combining polysaccharides from okra and tamarind worked best with freshwater. Overall, these plant-based polysaccharides worked either as well as or better than better than traditional flocculant polyacrylamide.
According to lead researcher Dr. Rajani Srinivasan, of Tarleton State University, in Texas, the plant-based flocculants can be used in existing water treatment processes. “The whole treatment method with the nontoxic materials uses the same infrastructure,” says Srinivasan. “We don’t have to build something new to incorporate these materials for water treatment purposes.”
Plastic, it turns out, is everywhere – in water, food – even our bodies. As awareness grows about the ubiquity of microplastics, researchers and environmentalists are working to find new ways to remove these pollutants. Some recent innovations include using mussels as natural filtration devices and replacing plastic seed coatings with a natural, biodegradable film.
Spotted: The average washing machine uses between 50 and 80 litres of water – in a world where over two billion people live in countries where water supply is inadequate.
To tackle this, Lylo Products has developed a device that allows users to wash their laundry using less water than a normal washing machine. Water is collected in a removable water tank that is placed on the floor of a shower like a mat. As the user showers, this tank fills up and is then reattached to the device’s base. The machine then filters the water and uses it to wash dirty clothes.
Lylo co-founder Joanne Powers recently spoke to Springwise. She explains that she was inspired to found the company after learning the shocking statistic that England could run short of water within 25 years.
One of the key benefits of Lylo is as an educational tool. “When people are using a device that collects and reuses water they suddenly start realising that water re-use is a possibility and is actually safe,” Powers explains. In this way the hope is that Lylo will act as a catalyst, inspiring other hardware innovators to explore ways for re-using water.
Affordability is another of the startup’s main aims. Students are a key target market for Lylo, as on-campus launderette facilities are often very expensive for those living on a tight budget. Eventually Powers hopes to develop a product that could be used in student accommodation – putting the responsibility for water saving onto universities rather than individual consumers.
The company’s short-term roadmap is to build a small number of units for pilot testing by the end of 2022. The purpose of this testing will be to check whether a device that involves such a lifestyle change is comfortable for people, and whether any further tweaks are needed before it goes into commercial manufacturing.
Other water-saving innovations recently spotted by Springwise include a recirculating shower, a shower sensor that encourages users to save water, and an eco-friendly fit bit for your water meter.
Water is life. Nothing in nature is simpler. The fate not only of humanity, but of all life on earth is bound up with our stewardship of the global water supply. And water courses are also dynamic eco-systems home to innumerable species of plants and animals. But over the past century, human water use has increased at double the rate of population growth. In simple terms, we are using more water than ever.
Recent decades have seen some important advances when it comes to clean water. Notably, between 2000 and 2020, the number of people using safely managed drinking water increased by 2 billion. But we are now facing a new, unprecedented threat to water resources: climate change. Unicef estimates that half of the world’s population could be living in areas facing water scarcity by as early as 2025, and 700 million people could be displaced by intense water scarcity by 2030.
Responsible water stewardship requires multi-layered solutions. But innovation will play an important role. From new physical technology—such as improved desalination processes—to the use of data to improve the management of water systems, innovators are working to protect the world’s most valuable asset.
Fresh water production
At the most basic level, humans need to drink water to survive. But today, 26 per cent of the global population lack access to safely managed drinking water. At the same time, unsafe water is responsible for 1.2 million deaths each year. In response, innovators are busy developing novel ways of producing fresh water – sometimes, literally, from thin air.
Desalination—which converts the earth’s abundant resources of saltwater into fresh water—is well-established but requires access to a dependable supply of electricity. Many water-stressed regions lack this security of supply. In response, a team of researchers has come up with a solar-powered desalination system that is both more efficient and less expensive than previous methods.
Other than the world’s oceans, the atmosphere is another potential source of water that new technology is looking to tap. Israeli company Watergen has developed a portable atmospheric water generator that pulls water directly from the air. The company is in a race to hit the market with Exaersis Water Innovations, a US company that has also developed a portable device for use by campers and off-grid travellers.
Sanitation and hygiene
People need safe access to water for sanitation and hygiene. Effective sanitation systems require high levels of urban planning and maintenance, which can be challenging in some parts of the world. Map Action is a Mali-based startup that has developed a mapping app that shows the location of issues such as broken pipes, and poor-quality wastewater systems.
In other situations, people lack access to even the most basic facilities like toilets. A Spanish design studio has developed an upcycled, 3D-printed portaloo designed to provide better facilities for refugees in camps and disaster recovery zones.
By contrast in the developed world, hygiene can place major demands on water resources. For example, the average showerhead uses 12 litres of water per minute. Danish company Flow Loop has developed a new recirculating shower that reduces water use by 85 per cent.
Pollution and wastewater treatment
Exacerbating issues of water scarcity is the fact that many human activities contaminate water supplies. According to the UN Environment Programme, 80 per cent of global wastewater goes untreated, containing everything from human waste to highly toxic industrial discharges. To tackle the issue of industrial water pollution, Finnish startup Algonomi is developing a circular system that uses algae to both clean up industrial waste water and produce useful materials.
Restoring water-based eco-systems
The water resources we use come from freshwater eco-systems that are on the decline as a result of human activity. Deforestation may grab the headlines, but between 1970 and 2015 the area covered by inland and coastal wetlands declined at three times the rate of forest loss.
Fortunately, innovators are working to mitigate this loss by restoring eco-systems – even within urban contexts. A student design concept aims to improve water circulation in urban rivers by creating a coral-reef-like structure for shrimps, shellfish, and other organisms. Another design for an underwater bicycle garage benefits the aquatic life of the area with porous concrete that helps plants and mussels stick to the walls, while coconut mats help purify the water, and mesh baskets shelter fish.
Local participation
Target 6B within SDG 6 highlights the importance of supporting and strengthening the participation of local communities in improving water and sanitation management. An app that allows community members in East Africa to maintain and diagnose their own water systems offers an excellent example of how technology can be used for community empowerment. The app provides locals with tools—such as maintenance checklists and diagnostic decision trees—through a smartphone. This helps them to avoid situations where they must wait days or weeks for repairs to their water systems.
Words: Matthew Hempstead
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