Adsorption techniques using activated carbon, in some processes is combined with biological treatment, can also be effective in removing SB from wastewater . In some cases, membrane filtration systems like nanofiltration or reverse osmosis may be employed to separate the compound from the water . The selection of treatment procedure often depends on the concentration of SB and additional pollutants in the effluent. Contamination of ecosystems is occurring due to the extensive use of preservatives, that containing organic cyclic substances like SB, in pharmaceutical and food products. Preservatives can enter aquatic systems through a variety of direct and indirect routes . The main source of water contamination with organic pharmaceutical pollutants is wastewater that contains residues of these substances . The influents and effluents of wastewater treatment plants were found to include these preservatives like SB often get into aquatic systems without going through the normal steps for treating wastewater . There is a significant amount of these pollutants in the used activated sludge . Biological treatment can get rid of many contaminants, but because these compounds have complicated molecular structures, it may not be able to fully break them down . There are also limits to how well chemical cleaning methods can get rid of these persistent pollutants . Because of this, some of these pharmaceutical residues can end up in rivers, lakes, and other bodies of water, where they could harm aquatic environments and people's health . The use of clean technology in water treatment has the dual benefit of reducing costs and environmental harm while simultaneously optimizing process potentials to minimize pollutants in drinking water .