Daily Archives: July 23, 2014

Pew Poll reveals serious misinformation on climate, not “climate change” attitudes

Bullying is the only tactic remaining for those people who have closed their minds to understanding science and climate. Climate can always change and always is adjusting. It is a dynamic system. The mantra of “climate change” continues to be repeated in order to garner political support for $billions of government funding for programs that will not solve the problem.

“A new poll offers details on the way citizens of the world think about climate change, and U.S. participants are looking particularly ignorant to the risks of global warming. Only one in four Americans said climate change was a “major threat,” making the U.S. the least concerned nation.”

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Inactivation of human adenovirus with UV and free chlorine

Jung-Keun Lee and Gwy-Am Shin. Inactivation of human adenovirus by sequential disinfection with an alternative UV technology and free chlorine. Journal of Water and Health. 09.1. 2011

There has been growing concern over human exposure to adenoviruses through drinking water due to the extreme resistance of human adenoviruses to the traditional UV technology (low-pressure (LP) UV). As an effort to develop an effective treatment strategy against human adenoviruses in drinking water, we determined the effectiveness of sequential disinfection with an alternative UV technology (medium-pressure (MP) UV) and free chlorine. Human adenovirus 2 (Ad2) was irradiated with a low dose of MP UV irradiation (10 mJ/cm2) through UV collimated apparatus and then exposed to a low dose of free chlorine (0.17 mg/L) at pH 8 and 5 degC using a bench-scale chemical disinfection system. A significant inactivation (e.g. 4 log10) of Ad2 was achieved with the low doses of MP UV and free chlorine within a very short contact time (~1.5 min) although there was no apparent synergistic effect on Ad2 between MP UV and free chlorine. Overall, it is likely that the sequential disinfection with UV irradiation and free chlorine should control the contamination of drinking water by human adenoviruses within practical doses of UV and free chlorine typically used in drinking water treatment processes.

Click here for full paper (Open Access).

 

Drinking water monitoring costs in seven developing countries

Crocker J, Bartram J. Comparison and Cost Analysis of Drinking Water Quality Monitoring Requirements versus Practice in Seven Developing Countries. International journal of environmental research and public health. 2014 Jul 18;11(7):7333-7346.

Drinking water quality monitoring programs aim to support provision of safe drinking water by informing water quality management. Little evidence or guidance exists on best monitoring practices for low resource settings. Lack of financial, human, and technological resources reduce a country’s ability to monitor water supply. Monitoring activities were characterized in Cambodia, Colombia, India (three states), Jordan, Peru, South Africa, and Uganda according to water sector responsibilities, monitoring approaches, and marginal cost. The seven study countries were selected to represent a range of low resource settings. The focus was on monitoring of microbiological parameters, such as E. coli, coliforms, and H2S-producing microorganisms. Data collection involved qualitative and quantitative methods. Across seven study countries, few distinct approaches to monitoring were observed, and in all but one country all monitoring relied on fixed laboratories for sample analysis. Compliance with monitoring requirements was highest for operational monitoring of large water supplies in urban areas. Sample transport and labor for sample collection and analysis together constitute approximately 75% of marginal costs, which exclude capital costs. There is potential for substantive optimization of monitoring programs by considering field-based testing and by fundamentally reconsidering monitoring approaches for non-piped supplies. This is the first study to look quantitatively at water quality monitoring practices in multiple developing countries.

Click here for full paper (fee).