Archive for November, 2015

International Water Reuse and Desalination Symposium

A two-day International Water Reuse & Desalination Symposium focused on climate resilient water solutions was held in Brisbane, Australia on the 4th and 5th of November.

This specialty conference was focused on practical aspects of water reuse and desalination, as well as relevant research being conducted in the US and Australia, and featured a blue ribbon assemblage of world-class experts on these two vital components of the water supply equation.

The picture shows Stuart Khan (on the right) presenting the Potable Reuse of Water collection

Editorial Board member and Associate Editor Stuart Khan attended this meeting and took this opportunity to present the Potable Reuse of Water collection included in issue 5 of Environmental Science: Water Research & Technology.

“The delegates understood and appreciated that the focus of our journal is specifically targeted toward engineered systems. That focus makes it considerably more specialised than most of the other water research journals in the field.”

Stuart Khan, Associate Editor

The symposium was a success and the themed collection was very well received. Dedicated to recent advances associated with the potable reuse of water, issue 5 includes a comprehensive collection of papers highlighting research technology and engineering development at the leading edge of potable water reuse.

“There was a lot of interest from the conference participants in our journal. A number of them were authors of the papers presented in this potable reuse of water issue, and others had already submitted papers to our regular issues. The fact that the themed issue was so precisely targeted to one of the key conference themes was particularly appreciated, and all complimentary copies were eagerly snapped up,” Stuart added.

The issue to combine a variety of topics relevant to potable reuse of water. This includes but is not limited to technical innovations, human health risk assessments, monitoring strategies, sustainability assessments and novel applications.

Why not read the full collection now?

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Saving water increases health risks in green buildings

US researchers have found that strategies for conserving water in green buildings can lead to higher levels of bacteria in the plumbing systems, with potentially serious implications for public health.

William Rhoads and colleagues at Virginia Tech conducted a survey of the drinking water quality in different types of green building, from an office to a net-zero energy home. They measured the chlorine levels, temperature and microbial content, including the prevalence of Legionella bacteria, the cause of Legionnaires’ disease. […]

Read the full article in Chemistry World!



Read the original research paper in Environmental Science: Water Research & Technology for free:

Survey of green building water systems reveals elevated water age and water quality concerns
William J. Rhoads, Amy Pruden and Marc A. Edwards
Environ. Sci.: Water Res. Technol.
, 2015, Advance Article
DOI:
10.1039/C5EW00221D, Paper


*Access is free through a registered RSC account
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Chlorinated compounds form in tea and coffee

Tea and coffee are the most consumed beverages in the world, but a new study has discovered some unexpected chemistry occurring in our cups.

Contrary to popular belief, boiling the water only removes around 20% of chlorine © Shutterstock

Chlorine is added to water as part of the disinfection process, with a residual amount remaining in the treated water to supress microbial growth. This chlorine reacts with organic molecules in the water to produce chlorinated chemicals known as disinfection byproducts (DBPs), such as chloroform.

Nikolai Kuhnert from Jacobs University, Germany, conducts research on compounds in tea and coffee. He advocates further research into the effects processing has on our food. ‘It illustrates further how little we know on the chemistry of food processing that significantly alters the chemical composition of our daily diet, producing both novel compounds with adverse or beneficial properties for human health.’



Read the full article in Chemistry World!

Read the original research paper in Environmental Science: Water Research & Technology:
Emerging investigators series: formation of disinfection byproducts during the preparation of tea and coffee

Tom Bond, Seeheen C. Tang, Nigel Graham and Michael R. Templeton
Environ. Sci.: Water Res. Technol.
, 2016, Advance Article
DOI:
10.1039/C5EW00222B

*Access is free through a registered RSC account

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Emerging Investigators Series author: Tom Bond

Tom Bond is a Junior Research Fellow (JRF) in the Environmental and Water Resource Engineering (EWRE) section at Imperial College London. His research is focused on the role aquatic chemistry can play in identifying and removing hazardous contaminants during water and wastewater engineering treatment processes.

Although he has spent most of his research career in engineering departments, his first degree was in chemistry and he is interested in synergistic interactions between the two disciplines. He holds a PhD on the treatment of disinfection byproduct precursors and MSc in Water and Wastewater Engineering, both from Cranfield University, and a first class honours degree (MSci) in chemistry from Bristol University.

Read Tom’s Emerging Investigators article ‘formation of disinfection byproducts during the preparation of tea and coffee’ here.


– How has your research evolved from your first to your most recent article?
My first article was on disinfection byproducts, as is this latest one. However, in between I have also worked on lots of different areas, so hopefully I am now knowledgeable about a wider range of research topics then when I started in research.

– What aspect of your research are you most excited about at the moment?
In general, I am excited by having the freedom to work on different topics and pursue things which interest me. If I am able to make any contributions to improving the public health impact of drinking water then that would be even better.

– Your paper discusses an issue that potentially affects most of us. How did you come up with this idea?
I was reading a thesis from a student at Imperial College, in which was made an incidental comment that tea and coffee represent potential sources of disinfection byproducts. And I thought, That’s an interesting idea actually. After looking in the literature, I was quite surprised to find that this was not something that had been looked at much detail previously. This made it seem like something that would be worth proposing as an MSci research project, which turned out to be the case, especially as an excellent student selected it (Seeheen Tang).

– What was your biggest challenge during this research?
We had some technical challenges with the laboratory work along the way. The biggest was that I initially wanted to undertake a liquid-liquid extraction on the chlorinated tea and coffee samples prior to analysing for disinfection byproducts by gas chromatography. This is a standard method in the drinking water research.

However, as we found out, when you try extracting tea or coffee into an organic solvent you get a horrible frothy mess, which is hopeless for extracting anything from. After trying some alternatives, I ended up sending some samples to an external lab for trihalomethane analysis using a headspace gas chromatography method. This relies on heating the sample to separate the volatile trihalomethanes, rather than extracting them.

– How did you find out about Environmental Science: Water Research & Technology and how was your experience?
It was mentioned to me by colleagues at Imperial, while I have also seen it advertised at conferences I have attended. The editorial and peer review process was very efficient in the case of this article.

– How do you spend your spare time?
In no particular order: walking/hiking, going to the pub, eating out and birdwatching. The last of these is my biggest passion, even if I probably spend more time on the other activities mentioned.

– If you could not be a scientist, but could be anything else, what would you be?
A writer, although I am not sure of which type. Of the various enjoyable aspects of working in a university, writing is the part I like most. And it would intrigue me to try writing in a different style to that required by science/academia. As a secondary alternative, being a professional footballer would be ok (!), although I fear that I am already too old, not to mention unskilled, for that possibility.

– Can you share one piece of career-related advice or wisdom with other early career scientists?
Try to improve a variety of aspects of your CV, rather than concentrating on one or two, as this should give you more opportunities in the future. It also helps if you know where you want to go in your career, as then you can plan strategically what is needed to get there.

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Electrodes enhance H2 production and sludge decomposition in microbial electrolysis

Using microbial electrolysis for hydrogen production

Microbial electrolysis is a method that generates methane or hydrogen from organic material by applying an electric current. Hydrogen is particularly explored as an alternative fuel for passenger vehicles, either in fuel cells to power electric motors or burned in internal combustion engines.

Microbial Electrolysis Cell

A schematic of the general process in a Microbial Electrolysis Cell - here with plant waste as initial resource (Image by Zina Deretsky, National Science Foundation, available as public domain: http://images.dailytech.com/nimage/6590_large_biohydrogen_h.jpg)

Microbial electrolysis and waste activated sludge

A Microbial electrolysis cell is capable of producing hydrogen from waste water or waste biomass. Waste activated sludge (WAS), a byproduct of biological wastewater treatment processes, is an example of how to produce hydrogen (H2) via the method of microbial electrolysis.

The hydrogen from anaerobic fermentation is produced by hydrogen producing bacteria (HPB) and consumed by hydrogen consuming bacteria (HCB) such as methanogens. Unfortunately the H2 production in anaerobic digestion of sludge is often low since the waste sludge have a limited carbohydrate source available for HPB.

The central process of microbial electrolysis cells is when exoelectrogens oxidise the substrates and release an electron to the anode, and then the electron is accepted by H+ to produce hydrogen at the cathode. This process requires a voltage supply to overcome the energy barrier between the two electrodes –although the hydrogen production from waste sludge might increase in a microbial electrolysis cell, the energy efficiency is low because of the extra voltage applied.

Low hydrogen production from anaerobic digestion of sludge has greatly limited the application of biological hydrogen-producing technology.

New research

A recent study published in Environmental Science: Water Research & Technology by Yinghong, Liu and Zhang sheds new light on the topic. By installing a Fe/graphite electrode into an anaerobic digester, the hydrogen production from waste sludge was improved. The electrode accelerated the decomposition of the sludge and also increased the production of short-chain fatty acids. The electric-anaerobic system also inhibited the occurrence of methanogenesis, which led to quite low methane production.

The study by Zhang and colleagues is unique since this was the first time that net energy was harvested from WAS in a hydrogen-producing microbial electrolysis cell with a cost-effective electrode.

Interested in this research? You can read the full paper for free* using the link below:

Enhancement of sludge decomposition and hydrogen production from waste activated sludge in a microbial electrolysis cell with cheap electrodes
Feng Yinghong, Yiwen Liu and Yaobin Zhang
Env. Sci: Water Res. Technol.
2015, advance article
DOI
:10.1039/c5ew00112a

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About the webwriter

Jesper Agrelius is a MSc student in Environmental Science at Linköping University, Sweden. His main interests regards environmental science, especially climate change and biogeochemistry. You can follow him on Twitter @JesperAgrelius.

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