Clever, fundamental engineering could go a long way toward preventing waterborne illness and exposure to carcinogenic substances in water.
Most of us are used to turning on a tap and water coming out. We rarely question whether this will happen or whether the water is clean enough to bathe in or drink. Though the process of maintaining water quality is practically invisible to most of us, removing bacteria and contaminants from water requires a lot of effort from both humans and treatment systems alike.
Mohammad Alizadeh Fard, a doctoral student in Michigan Tech’s Civil and Environmental Engineering Department, and Brian Barkdoll, professor of civil and environmental engineering, are developing low-tech, affordable solutions to improve water quality in municipal water tanks, and to remove micropollutants from water using renewable materials.
Their research has been published in three journals—Journal of Hydraulic Engineering (DOI: https://doi.org/10.1061/(ASCE)HY.1943-7900.0001459), Journal of Molecular Liquids (DOI: https://doi.org/10.1016/j.molliq.2017.11.039), and Colloids and Surfaces A(DOI: https://doi.org/10.1016/j.colsurfa.2017.08.008)—with a fourth paper pending review. Their work proves that solutions to vexing problems can be elegant in their simplicity.
An Elegant, Low-Tech Solution
In communities around the nation, there are large water-storage tanks for municipal drinking use. Many such tanks have a line in to supply the tank with water, and a line out. However, these lines in and out are frequently at the tank bottom. Though the tanks are refilled daily, the water at the top of the tank is never used and becomes stagnant. Even though many municipal water supplies are treated with chlorine, the top water layer can become a breeding ground for bacteria, algae or waterborne illness, such as giardia and E. coli.
“If the water is not moving, (bacteria and algae) can start growing,” Barkdoll says. “It may not be originally from the water source; it could be from the air. Or the chlorine in the stagnant water could be used up after some time. You want the water to keep moving, especially in hot regions of the country.”
Keep the water circulating: Barkdoll and Alizadeh Fard’s shower head-like attachments that can be added to new or existing municipal water tanks keep water in the tanks moving, which prevents stagnation.
But if there’s a large fire in the community or surrounding countryside, the water tank is drawn down significantly, and people then drink the stagnant water.
“So, when you have a fire, all the stagnant water goes out to everybody’s house,” Barkdoll says. “After a fire, people get sick, that’s a known thing. That’s the problem that we’re trying to fix.”
To remedy the problem, Alizadeh Fard and Barkdoll created shower head-like attachments that can be added to new or existing water tanks for minimal cost. Adding a PVC-pipe sprinkler at the top of the tank, and a reverse sprinkler at the bottom of the tank, injects water into the system and keeps all the water circulating. Alizadeh Fard and Barkdoll published their article on this simple but effective system in the Journal of Hydraulic Engineering March 15. They hope it will be a low-tech solution easy for water quality managers to adopt.
Unseen Menace: Micropollutants
But organic contaminants are not the only source of contaminated water. Few municipal systems are equipped to handle micropollutants—such as pharmaceuticals, hormones, microplastics, nanoparticles in socks and synthetic fleece, and antifungal compounds—even types of industrial waste that are present in very low concentrations. Despite the small amounts—mere micrograms—of these pollutants in water, they still have carcinogenic effects on humans and aquatic creatures. Retrofitting treatment plants to filter for micropollutants is expensive, leading Barkdoll and Alizadeh Fard to explore potential solutions.
“These contaminants have long-term effects on health,” Alizadeh Fard says. “Most of our treatment plants have not been designed to remove them from water, so it’s important to find a reliable solution to address the problem.”
The Latest on: Micropollutants
via Google News
The Latest on: Micropollutants
- Teen of the Week: Severn School senior’s project enables citizen scientists to monitor micropollution of Chesapeake Bayon October 4, 2019 at 6:01 am
Inspired by those passions, she earned a place as one of 15 Van Eney ‘09 Fellows engaged in independent study projects by proposing to construct a “trawl” to filter micropollutants from Maryland ...
- Testing data shows breakthrough in treatment for micropollutants in municipal wastewateron January 9, 2019 at 4:00 pm
Consequently, discharge of micropollutants in municipal wastewater effluents is currently a high priority issue for regulators and municipalities. Due to the lack of existing economically viable ...
- Cleaner Wateron September 8, 2018 at 6:00 pm
Global water supplies are becoming increasingly contaminated with toxic chemicals, known as micropollutants, which threaten the health and well-being of billions of people. A byproduct of industrial, ...
- A next generation nano media tailored to capture and recycle hazardous micropollutants in contaminated industrial wastewater.on March 31, 2018 at 5:00 pm
A next generation nanomedia that can be tailored to capture and recycle specific micropollutants in contaminated industrial wastewater. Lack of access to clean water is predicted to affect 47% of the ...
- Removal of organic micropollutants from wateron March 17, 2018 at 1:55 pm
In sustainable water management, the removal of organic micro-pollutants from (waste)waters is indispensable but extremely difficult. Advanced Oxidation Processes (AOPs) like ultrasonic irradiation, ...
- Low-Tech, Affordable Solutions to Improve Water Qualityon March 16, 2018 at 1:40 pm
But organic contaminants are not the only source of contaminated water. Few municipal systems are equipped to handle micropollutants—such as pharmaceuticals, hormones, microplastics, nanoparticles in ...
- Catalytic metal foams harness sunlight to clean wateron February 15, 2018 at 2:39 am
Micropollutants – found in toxic chemicals such as drugs, hormones and pesticides – appear in wastewater in low concentrations, and can eventually work their way into the food chain via the soil, ...
- One-pot synthesis of trifunctional chitosan-EDTA-β-cyclodextrin polymer for simultaneous removal of metals and organic micropollutantson November 16, 2017 at 4:00 pm
The global contamination of water resources with inorganic and organic micropollutants, such as metals and pharmaceuticals, poses a critical threat to the environment and human health. Herein, we ...
- New Study: CycloPure Polymer Demonstrates Superior Performance in Removal of Micropollutantson June 20, 2017 at 6:00 am
2 In that study, the CD-MP polymer bested several conventional adsorbents in the removal of eight micropollutants, including bisphenol A (BPA), the pesticide metolachlor, and the estrogen steroid ...
via Bing News