Friday, September 22, 2017

New paper on taste/odor considerations in chlorine disinfection

Congratulations to Yoshika Crider on a useful investigation! Note that Elsevier is making this paper available free of charge through 10 November 2017 at this link.

Can you taste it? Taste detection and acceptability thresholds for chlorine residual in drinking water in Dhaka, Bangladesh
Yoshika Crider, Sonia Sultana, Leanne Unicomb, Jennifer Davis, Stephen P. Luby, Amy J. Pickering


Abstract
Chlorination is a low-cost, effective method for drinking water treatment, but aversion to the taste or smell of chlorinated water can limit use of chlorine treatment products. Forced choice triangle tests were used to evaluate chlorine detection and acceptability thresholds for two common types of chlorine among adults in Dhaka, Bangladesh, where previous studies have found low sustained uptake of chlorine water treatment products. The median detection threshold was 0.70 mg/L (n = 25, SD = 0.57) for water dosed with liquid sodium hypochlorite (NaOCl) and 0.73 mg/L (n = 25, SD = 0.83) for water dosed with solid sodium dichloroisocyanurate (NaDCC). Median acceptability thresholds (based on user report) were 1.16 mg/L (SD = 0.70) for NaOCl and 1.26 mg/L (SD = 0.67) for NaDCC. There was no significant difference in detection or acceptability thresholds for dosing with NaOCl versus NaDCC. Although users are willing to accept treated water in which they can detect the taste of chlorine, their acceptability limit is well below the 2.0 mg/L that chlorine water treatment products are often designed to dose. For some settings, reducing dose may increase adoption of chlorinated water while still providing effective disinfection.

Monday, August 28, 2017

Water Security journal launch August 29th

Attending SIWI World Water Week in Stockholm?  
Please join us to mark the launch of a new journal, Water Security, and attend a showcase panel session on sanitation and health. 
Professor Joan B. Rose (Michigan State University) will talk about her research as well as the opportunities and challenges of connecting research with practice.
Mr. Michael Markus (Orange County Water District) will reflect on collaborations with researchers in his role as General Manager of the Orange County Water District, winner of the 2008 Stockholm  Industry Water Award.
Hope to see you there!
Tuesday, August 29, 5:00
Room NL 253, City Conference Center


Monday, June 6, 2016

Kenya leading with CBS-friendy sanitation policy innovation

Based on their experience with Sanergy, Sanivation, and other container-based sanitation service providers, Kenya’s new Environmental Sanitation and Hygiene Policy has recognized CBS as an 'improved' sanitation option.

Under what conditions can CBS services address  perennial challenges of serving low-income households, such as high and ‘lumpy’ costs, low rates of home ownership, space constraints, and low demand for waste treatment? These open-access papers include discussions of these questions, and also present findings from our collaboration with the Haitian NGO, SOIL, on a new CBS service in Cap Haitien:

 

Tuesday, May 31, 2016

Congratulations to Joan Rose!

Congratulations to Professor Joan Rose of Michigan State University, who has been named the 2016 Stockholm Water Prize Laureate for her contributions to "assessing risks to humans from water and creating guidelines and tools for decision-makers and communities to improve global wellbeing."
For more information on Prof. Rose's work, see this news release by the Stockholm International Water Institute.

Friday, March 4, 2016

Container-based sanitation webinar on March 17!

Learn more about the role that container-based sanitation (CBS) can play in expanding safe, affordable sanitation services to low-income urban communities in a webinar organized by the Water, Health and Development Program at Stanford University.

A panel of experts working in Haiti, Kenya, and Ghana will discuss their experiences with this innovative approach to safely managing human waste. The webinar will introduce the CBS concept, present case studies, and offer a moderated Q&A session. More information is available here; please register for the webinar here!


 




 



Tuesday, June 30, 2015

The friendly skies

Resource recovery comes to aviation: Fulcrum Bioenergy is refining jet fuel from municipal solid waste (but not fecal sludge)!

Farm Waste and Animal Fats Will Help Power a United Jet

Tuesday, June 9, 2015

CH2M wins Stockholm Industry Water Award

Passionate advocate for water reuse wins 2015 Stockholm Industry Water Award

Stockholm (09 June 2015) – CH2M, a Colorado-based global service and engineering company, has been named the winner of the 2015 Stockholm Industry Water Award, for developing and advancing methods to clean water, and increasing public acceptance of recycled water.

“CH2M has long recognized that our global community cannot afford to use water once and dispose of it—fresh water sources are too precious and growing more scarce. We are proud to receive the 2015 Stockholm Industry Award for our leadership in the evolution and acceptance of purifying wastewater effluent to create drinking water,” said Greg McIntyre, CH2M Global Water Business Group President.
CH2M has invented, implemented and refined methods for cleaning used water back to drinking water quality. But, since this water is only valuable if people actually use it, the firm has put significant and successful effort into building public understanding and acceptance. They pioneered the application of social science research to better understand the underlying reasons for why people reject the notion of reuse and what might be done to change that mindset. This research, combined with demonstrations, education and transparency has dispelled myths around use of treated wastewater and paved the way for a surge in interest in and acceptance of potable reuse.
“Our planet does not hold any enormous, unknown sources of fresh water. We have to live with what we have. With growing populations and more unreliable precipitation patterns, it is essential to increase our reuse of water in the future,” says SIWI’s Executive Director Torgny Holmgren, and adds: “CH2M has understood this. In working for public acceptance of drinking treated wastewater, they have taken a step beyond engineering, and shown impressive commitment to wise water management.”
“Through rigorous testing and analysis of both technical processes and societal perceptions, CH2M has created the opportunity to close the urban water loop,” states the Award Committee in their citation.
CH2M’s first notable success in wastewater recycling came in the 1960s, when CH2M pioneered the third, advanced stage of effluent treatment by successfully removing excess phosphorous, nitrogen and trace metals, restoring the used water of the South Tahoe Public Utility to pristine purity. Through a series of improvements, tests and large-scale implementation, the technology of treating used water back to drinking water quality was further refined to increase reliability, efficiency, and sustainability.
In the 1970s, CH2M designed the world’s first surface water indirect potable reuse plant, improving the water quality for more than one million people in northern Virginia—raising the bar for cost-effective wastewater treatment.
“CH2M was founded out of a deep belief that engineering technology could make the world a better place. While technological innovation is an important part of our contribution to water reuse, many of the pivotal water reuse milestones would not have been built if the public had not accepted them. Through technology and innovative public education tools, we will continue to contribute to a more sustainable water future,” said Brock McEwen, CH2M’s Global Water Technology Director.
CH2M continued to evolve water reuse practices and in the early 2000s worked with Singapore’s national water agency, to not only prove the safety of potable reuse, but to win public acceptance with the country’s NEWater project. By combining state-of-the-art technology and public education tools, unprecedented public acceptance of water reuse was achieved.
“In a rapidly urbanizing world where the vast majority of sewage spills untreated out into the environment, the transformative technologies and strategic communication of this year’s SIWA winner has provided a significant step towards future water security of cities.” the Award Committee concludes.

SIWA – recognizing water excellence in the business world
The Stockholm Industry Water Award (SIWA) was established in 2000 to stimulate and celebrate outstanding and transformative water achievements by companies in improving production, managing risks, finding solutions and contributing to wise water management. The Royal Swedish Academy of Engineering Sciences (IVA) and the World Business Council for Sustainable Development (WBCSD) were partners in establishing the award, which is also supported by International Water Association (IWA) and World Wide Fund for Nature (WWF).