Anaerobic Baffled Reactors for wastewater treatement

This article points to the results from a study of the processes involved in treating wastewater in an Anaerobic Baffled Reactor and collecting methane as a byproduct. An ABR is essentially a combination between a septic tank and a biogas reactor, whose design aims to increase the contact time with the active biomass (sludge), which in term results in improved treatment. ABRs are often used for the primary treatement of wastewater in DEWATS (DEcentralized WAstewater Treatment Systems), while a constructed wetland is used for the secondary treatement.

Some of the advantages of the Anaerobic Baffled Reactor are:


  • Simple design
  • No moving parts
  • No mechanical mixing
  • Inexpensive to construct
  • High void volume
  • Reduced clogging
  • Reduced sludge bed expansion
  • Low capital and operating costs


  • No requirement for biomass with unusual settling properties
  • Low sludge generation
  • High solids retention times (SRT)
  • Retention of biomass without fixed media or a solid-settling chamber
  • No special gas or sludge separation required


  • Low hydraulic retention times (HRT)
  • Intermittent operation possible
  • Extremely stable to hydraulic shock loads
  • Protection from toxic materials in influent
  • Long operation times without sludge wasting
  • High stability to organic shocks

The study is located here and is also mirrored here.

A detailed overview of a DEWATS (DEcentralized WAstewater Treatment System) built in Bangalore is located here and is also mirrored here.

A study outlining the low temperature performance of  and UASB (Upflow Anaerobic Sludge Blanket) wastewater treatement systems can be found here and is also mirrored here.

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