In agriculture, country houses and many other places without central sewerage, people use mobile toilets or dump wells. To prevent the foul smell in the bench-holes and during transportation of the contents to wastewater treatment facilities, biocides are added, which are chemical compounds that stop the activity of microorganisms.
Click here for original story, Biologists compare and select most effective and nontoxic biocides for mobile toilets and dump wells
Source: Phys.org