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
- Nouryon and Van Remmen join forces to demonstrate new water-treatment technologyon September 17, 2019 at 12:30 pm
Nouryon (Amsterdam, the Netherlands; www.nouryon.com) has joined forces with water treatment company Van Remmen UV Technology on a novel method to address the growing concern of pharmaceutical ...
- Scientists find cocaine in all samples of shrimp from rural U.K. countyon May 2, 2019 at 12:49 pm
A study carried out by scientists from King’s College London and the University of Suffolk tested the exposure of wildlife like freshwater shrimp to different micropollutants at 15 different sites in ...
- Wild shrimp test positive for cocaine and other drugs, pesticides in new studyon May 2, 2019 at 12:31 pm
The study sought to determine to what extent shrimp (Gammarus pulex) and other marine animals have been exposed to micropollutants. Researchers took samples from 15 different river sites across ...
- Cocaine found in shrimp, shocking study revealson May 1, 2019 at 9:17 am
The research looked at the exposure of wildlife, including the freshwater shrimp Gammarus pulex, to different micropollutants when the researchers came to the startling revelation. "Although ...
- Testing data shows breakthrough in treatment for micropollutants in municipal wastewateron January 9, 2019 at 4:00 pm
WESTMINSTER, CA, JAN 10, 2019 --BioLargo, Inc. (OTCQB:BLGO), developer of sustainable science and technologies and a full-service environmental engineering company, has announced the completion of a ...
- 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
The CD-MP polymer was the first of the company's enhanced adsorption materials designed with its proprietary cyclodextrin technology. The breakthrough technology, enabling the design of high-affinity ...
- New Study: Cyclopure Polymer Demonstrates Superior Performance In Removal Of Micropollutantson June 19, 2017 at 5:00 pm
In another milestone development, CycloPure, Inc. announced that its micropollutant polymer, CD-MP, outperformed activated carbon in the removal of micropollutants from water in a new head-to-head ...
- Ecosystem stress caused by micropollutantson June 1, 2017 at 5:50 am
In Switzerland, more than 30,000 different substances are used on a daily basis in innumerable products – pharmaceuticals, cosmetics, cleaning agents or industrial chemicals. Many of these substances ...
via Bing News