Seite - 179 - in Clean Water Using Solar and Wind - Outside the Power Grid

© 2019 The Author. This is an Open Access book chapter distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (https://creativecommons.org/licenses/by-nc-nd/4.0/). This does not affect the rights licensed or assigned from any third party in this book. The chapter is from the book Clean Water Using Solar and Wind: Outside the Power Grid, Gustaf Olsson (Author). doi: 10.2166/9781780409443_0179 Activated sludge process: a biological wastewater treatment by which bacteria that feed on organic waste are continuously circulated and put in contact with organic waste in the presence of oxygen to increase the rate of decomposition. Aerobic: “with oxygen”, used for biological treatment systems characterised by the presence of oxygen, mostly as oxygen dissolved in water. Alternating current (AC): electric current that reverses direction 50  or 60 times per second. Anaerobic: requiring absence of air. Aquifer: large body of permeable or porous material situated below the water table that contains or transmits groundwater. Battery: a type of battery that can be given a new charge by passing an electric current through it is also called a storage battery. A lead-acid battery uses plates made of pure lead or lead oxide for the electrodes and sulphuric acid for the electrolyte; these remain common for off-grid installations. A lithium battery uses a liquid lithium-based material for one of its electrodes. A flow battery uses two chemical Appendix 1 Glossary Downloaded from https://iwaponline.com/ebooks/book-pdf/520710/wio9781780409443.pdf by IWA Publishing user