Photochemical treatments

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  • Critical aspects for the wider application of ultraviolet (UV) light in drinking water treatment sometimes have been described, in spite of the success of the method as established in the field: • Absence of well-established and generally accepted design rules • Absence of a permanently active residual agent in the treated water • Suspicions of the possible photochemical formation of by-products • Possibility of revival–reactivation by repair mechanisms of irradiated organisms • Need for operational control of the permanent reliability of the technique...

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  • Textile industry is a leading industry for most countries, such as China, Singapore, UK, Bangladesh, Italy, Turkey etc. But, environmental pollution is one of the main results of this industry. Parralel to usage of huge amounts of water ad chemicals, the textile dyeing and finishing industry is one of the major polluters among industrial sectors, in the scope of volume and the chemical composition of the discharged effluent (Pagga & Brown, 1986).

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  • In 1996, the U.S. Department of Energy (DOE) and Mexico s Petr leos Mexicanos (PEMEX) began sponsoring this project to characterize the nature and sources of suspended particulate matter found in the ambient air in Mexico City. This collaborative effort follows another program sponsored by DOE and PEMEX in the early 1990 s to study gas phase pollutants and photochemical oxidants in the Valle de Mexico. 3,4 The high altitude, the year- round sunshine, and the complex atmospheric chemistry characteristic of Mexico City create a challenging laboratory for scientific research.

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