page_title: Upflow anaerobic sludge blanket digestion
section_title: Design
hierarchical_section_title: Upflow anaerobic sludge blanket digestion / Design
caption_attribution_description: Anaerobic digesters from an ArrowBio Mechanical Biological Treatment facility in Tel-Aviv, Israel, taken 2006 by Alex Marshall
context_page_description: Upflow anaerobic sludge blanket technology, normally referred to as UASB reactor, is a form of anaerobic digester that is used for wastewater treatment.
  The UASB reactor is a methanogenic digester that evolved from the anaerobic clarigester. A similar but variant technology to UASB is the expanded granular sludge bed digester.
context_section_description: With UASB, the process of settlement and digestion occurs in one or more  large tank(s). The effluent from the UASB, which has a much reduced biochemical oxygen demand (BOD) concentration, usually needs to be treated further, for example with the activated sludge process, depending on the effluent quality requirements.
caption: UASB reactor shown is the larger tank. Hiriya, Tel Aviv, Israel
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