How Primary Clarifiers Work

This 3D animated video shows how a circular primary clarifier works. We look at all of the main components of the clarifier, how it works and the factors that influence its performance. ********** Check out some of our FREE engineering Apps! https://play.google.com/store/apps/developer?id=saVRee ********** Want more high-quality educational engineering videos? Click on the link below to view our online video courses. https://courses.savree.com/pages/youtube-special-offer And don't forget your COUPON CODE (use it at checkout!)! 25%-off-youtube Hope to see you on a course soon! ********** This section explains what a circular primary clarifier is and how it works. Introduction Primary clarifiers are used to complete the process of sedimentation. Sedimentation is the process of separating suspended solids from a liquid. Separation without mechanical means can be completed within a sedimentation basin or settling tank, separation using mechanical means is completed using a clarifier. Clarifiers are used in many water treatment facilities, as well as in the mining, paper and pulp, and sanitation industries. Clarifiers can be of the rectangular, sloped or circular design. The purpose of the clarifier is to reduce the velocity of the influent in order to allow the suspended solids to separate from the liquid. Heavy solids are referred to as settleable solids and these accumulate on the bottom of the clarifier to form sludge. Lighter solids are referred to as floatable solids and these accumulate on the liquid surface to form scum. Clarifiers have found widespread application because they are very effective and offer a good return on investment compared to other alternatives. A typical primary clarifier will separate between 90-95% of settleable solids from the liquid and 40-60% of suspended solids. How It Works Influent enters through the central pipe and is discharged to the centre of the clarifier. The influent velocity is reduced and settling occurs due to gravity. Heavier solids form sludge and are removed using rakes/ploughs. Lighter solids float on the top of the liquid and are removed by a scum skimmer. The cleaned liquid passes through a weir and into the effluent launder. The effluent is then extracted for direct discharge or further treatment. ********** You can read more about primary clarifiers in our technical encyclopaedia: https://savree.com/en/product/primary-clarifier/ Check out all of our available courses here: https://savree.com/en/list-of-savree-courses/ Want to use this 3D model in your training course or lesson? Simply join saVRee! Access all courses and over 300 interactive 3D models for only €14.99 a month (no obligation trial month only €9.99). If you need a custom 3D model for your interactive 3D presentation or marketing video, please visit: https://savree.com/en/custom-3d-model/ If you need a custom 3D animation for your interactive 3D presentation or marketing video, please visit: https://savree.com/en/custom-3d-animation/ Need a custom product configurator similar to that shown in the video? Get in touch! https://savree.com/en/contact Sources: By 19ceic3004 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29027554 eCompendium of sanitation systems and technologies: http://ecompendium.sswm.info/sanitation-technologies Eawag: Swiss Federal Institute of Aquatic Science and Technology Technical drawings: designport, Paolo Monaco, Zurich See http://ecompendium.sswm.info/copyright By User:Dantadd - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1909908 #saVRee #PowerEngineering #IndustrialEngineering