Water & Wastewater Treatment

WWT May 2018

Water & Wastewater Treatment Magazine

Issue link: https://fhpublishing.uberflip.com/i/971076

Contents of this Issue


Page 20 of 43

MBBRs: Putting wastewater to bed Moving Bed Bioreactors (MBBRs) are the filtration method of choice for many operators looking to remove BOD, ammonia and nitrogen from wastewater. Here we take a close look at the technology and the plastic media at the heart of the process The Knowledge www.wwtonline.co.uk | WWT | MAY 2018 | 21 BY DEREK ALLEN, BUSINESS CONSULTANT, WARDEN BIOMEDIA Q: What is a Moving Bed Bioreactor and how was this technol- ogy developed? A: MBBR technology was developed in the 1980s and was primarily the natural evolution of the established, well proven and robust fixed film process. Initially the conventional mineral media trickling filter, it then progressed to submerged aerated filter [SAF] technology and finally to a moving bed [MBBR] configuration. Each process was driven by the need to achieve a higher discharge standard and a smaller footprint. Significant improvements were made to the fixed film process with the introduction of light weight, high efficiency polypropylene random media in the 1960s. Today, MBBR technology is rapidly becoming the treatment plant operators' choice due to its ease of Q&A operation, consistent process performance and reduced operator input. Q: How does an MBBR work? The principle of MBBR technology is based on an active biofilm growing on small specially designed polypropylene elements that are suspended in the reactor vessel. The process utilises the advantages of both activated sludge and fixed film technologies without being restricted by their disadvantages. The MBBR process can be used for BOD removal, nitrification, or denitrification. The media only partially fills the retaining tank, typically between 35% and 67%. This depends on the required removal efficiency or required effluent quality and is immersed in the wastewater undergoing treatment, enabling it to circulate freely. For BOD removal or

Articles in this issue

Links on this page

Archives of this issue

view archives of Water & Wastewater Treatment - WWT May 2018