A major composition of wastewater coming from various laundries includes recalcitrant organics such as surfactants, which is the main constituent of most detergents. Such organic compounds exhibit high resistance to degradation and are able to persist in the environment for long periods of time. As a result, they often hinder with the biological activities of aquatic life, including microorganisms, when discharged into natural water bodies. This leads to an alteration of the biotic composition of the water body. Although there are several methods for the treatment of such wastewater that are widely available and used; yet, a number of such techniques are often unable to achieve the required degree of treatment in respect of removal of these organics. Advanced Oxidation Processes are a newly developed set of techniques used for the treatment of water and wastewater. This innovation is also based on an advanced oxidation process, and is therefore able to overcome the challenges with conventional treatment technologies and is able to sufficiently treat the recalcitrant organics containing wastewater with good efficiency.
The innovation is based on treatment of laundry wastewater, which mainly constitutes of recalcitrant organic compounds, by advanced oxidation process. The reactor system consists of three UV cartridges or reactors, similar to those used in RO/UV filters used at houses, offices and institutions for providing drinking water. The cartridges are sequentially arranged in vertical position, with the outlet of one reactor being connected to the inlet of the next. Each cartridge is provided with an 11 watt UV lamp, of which two are kept operational by connecting to a power source by means of a DC choke. Upflow condition is maintained and wastewater is allowed to flow into the system at a fixed rate by means of a peristaltic pump. Suitable amount of hydrogen peroxide is dosed into the wastewater before its treatment. The UV light helps in formation of hydroxyl radicals, which break down the recalcitrant organic compounds and leads to treatment of the wastewater. Treated wastewater is collected at the outlet for analysis. Several trials can be performed to achieve optimum conditions corresponding to maximum treatment efficiency.
Link: An unique feature of this innovation is that it is based on continuous mode operation, which is similar to what is generally observed in commercial treatment plants.
Problem Scale: Worldwide
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