Photovoltaic powered ultraviolet and visible light-emitting diodes for sustainable point-of-use disinfection of drinking waters

An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

“…Lui et al . , reviewed the application of UV/LEDs to point‐of‐use disinfection of drinking waters for rural or decentralized water supplies. Prototype systems in which photovoltaic‐powered UV/LED water treatment systems were constructed for sustainable point of use disinfection purposes.…”

“…Prototype systems in which photovoltaic‐powered UV/LED water treatment systems were constructed for sustainable point of use disinfection purposes. However, the systems have challenges and barriers to overcome, including the expense of the systems . Lui et al .…”

Improved Drinking Water Disinfection with UVC-LEDs for Escherichia Coli and Bacillus Subtilis Utilizing Quartz Tubes as Light Guide

“…However, nearly 2.5 billion people worldwide have no access to improved sanitation and 748 million of them still lack sufficient access to improved drinking water sources [1], accounting for over 1.7 million deaths a year, especially in developing countries [2,3]. The upcoming technology of UVC-LEDs promises new inexpensive, environmentally friendly, and long-life disinfection systems for drinking water that can be used decentralized in combination with photovoltaic systems [3]. UVC radiation (200-280 nm) in general is a very efficient way of inactivating pathogen bacteria in drinking water by directly damaging the DNA [4].…”

“…Normally, much UVC power of such a system is wasted due to inadequate optical coupling. Because of the high power output, these systems still guarantee sufficient fluence rates of over 40 mJ/cm 2 [3,5]. Figure 1a shows a buildup concept for a traditional cylindrical UV disinfection reactor [9].…”

Multi-functional CNT/ZnO/TiO2 nanocomposite membrane for concurrent filtration and photocatalytic degradation

“…The foremost leverage of membrane technologies over conventional treatment processes is typically the ability to remove suspended materials ranging from particles to ions from a wide range of suspension including sewage effluents [2,[4][5][6]. However, the broad application of membrane technologies is dictated to certain extent by the membrane fouling issues occurred owing to the accumulation of anthropogenic organic pollutants and microorganisms on the surface of in the pores of membrane [7,8], which results in low water quality, high operation cost, and short lifespan of membrane [9]. Therefore, to negate such limitations, introduction of heterogeneous photo-catalysis with semi-conductors has been rapidly accepted in the field of water treatment to remove organic and inorganic pollutants from influents [10][11][12].…”