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Learn the origin, meaning and usage of the colloquial expression "fish or cut bait", which refers to division of complementary tasks or making a decision. See examples from history, literature and film.
Reverse osmosis (RO) is a water purification process that uses a semi-permeable membrane to separate water molecules from other substances. RO can remove dissolved or suspended chemical species as well as biological substances, and is used in industrial processes and the production of potable water.
Learn about the process of removing contaminants from water for various purposes, such as drinking, medical or industrial use. Compare different methods of water purification, such as filtration, disinfection, distillation, and desalination, and their advantages and disadvantages.
Learn how water softening removes calcium, magnesium and other metal ions from hard water, and what are the benefits and drawbacks of different methods such as ion-exchange, lime softening, chelating agents and reverse osmosis. Find out how soft water affects soap, plumbing, skin and environment.
Sewage treatment (or domestic wastewater treatment) is a type of wastewater treatment that aims to remove contaminants from sewage to produce an effluent that is suitable to discharge or reuse. Sewage treatment plants (STPs) are facilities that process sewage using various technologies and criteria.
A reverse osmosis plant is a manufacturing plant that purifies or desalinates water by forcing it through a membrane. Learn about the process, the energy requirements, the applications and the examples of reverse osmosis plants around the world.
Hydroponics is a type of horticulture that grows plants without soil, using water-based mineral nutrient solutions in an artificial environment. Learn about the origin, development and benefits of hydroponics, as well as the different methods and crops used in this technique.
Learn about the processes, sources, contaminants and sectors of industrial wastewater treatment. Industrial wastewater is the by-product of various industries that may contain pollutants such as heavy metals, organic matter, nutrients, toxins, radionuclides and microplastics.