News Column

Findings from University of Engineering and Technology Update Understanding of Environmental Clean Technologies

June 27, 2014



By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Investigators publish new report on Environmental Clean Technologies. According to news reporting from Lahore, Pakistan, by VerticalNews journalists, research stated, "Solar disinfection (SODIS) is widely practiced all around the world. The process requires variable exposure periods depending upon a number of process parameters (e.g., water turbidity, atmospheric temperature, and cloud cover conditions)."

The news correspondents obtained a quote from the research from the University of Engineering and Technology, "This paper describes the development of a mathematical model to estimate required exposure period to achieve Fecal coliforms (FCs) removal for changing process parameters. Daily and hourly solar radiation were estimated and found to be suitable for SODIS application with intensity of 500 W/m(2) over a period of 3-5 h/day. Randomized SODIS experiments over a period of 3 years were conducted to consider seasonal and weather variations. Six samples each for five levels of turbidity (0, 5, 10, 20, and 30 NTU) were exposed to sunlight under variable cloud cover conditions on different days during the 3-year sampling period. Samples were collected and analyzed for remaining FCs at different intervals in each sampling day. Analysis of variance revealed that turbidity and percent of cloud cover are the most significant process parameters. It was found that FCs die-off in SODIS bottles followed the first-order kinetics. Different data sets were used for the development and calibration of the model. The calibrated model was further verified against the literature. Simple characteristics curves have also been established for practical application at household level to estimate exposure periods."

According to the news reporters, the research concluded: "The study revealed a significant difference between the required exposure periods for different turbidity and cloud cover conditions."

For more information on this research see: Modeling exposure period for solar disinfection (SODIS) under varying turbidity and cloud cover conditions. Clean Technologies and Environmental Policy, 2014;16(5):861-874. Clean Technologies and Environmental Policy can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer - www.springer.com; Clean Technologies and Environmental Policy - www.springerlink.com/content/1618-954x/)

Our news journalists report that additional information may be obtained by contacting H. Haider, Univ Engn & Technol, Inst Environm Engn & Res, Lahore 54890, Pakistan. Additional authors for this research include W. Ali, S. Haydar, S. Tesfamariam and R. Sadiq.

Keywords for this news article include: Asia, Lahore, Pakistan, Environmental Clean Technologies

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Source: Ecology, Environment & Conservation