GM foods are classified into one of three generations. First-generation crops have enhanced input traits, such as herbicide tolerance, better insect resistance, and better tolerance to environmental stress.
Sewage treatment. Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent).
These bacteria are able to adapt to either condition, although they prefer the aerobic condition. These three types of bacteria are grouped only by their method of respiration. There are many species of bacteria in a wastewater treatment plant. In a recent study, over 300 species were identified in an aeration basin. However, they can all be classified as aerobic, anaerobic or facultative.