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).
Since heat is vital in thermal desalination, the process is often linked to power plants and refineries to use waste heat. There are three main types of thermal desalination â vapour compression (VC), multi-effect distillation (MED) and multi-stage flash distillation (MSF).o create clean water using this process, seawater or brackish water is pressurized against one surface of the membrane, causing salt-depleted water to move across the membrane, releasing clean water from the low-pressure side.