Low rate anaerobic reactors: They are fed with an OLR of typically 1-2 kg COD/m3.day. They are the earliest types of reactors used in anaerobic treatment. They are operated in ambient temperature, pH and SRT of the reactor are not regulated in the reactors. HRT of the reactor can be as high as 100 days that is not favorable in anaerobic treatment. They are mixing-free reactors. Ponds, septic tanks and also batch reactors can be pointed as an example of low rate reactors.
High rate anaerobic reactors: These are the reactors that have been designed and developped to treat waste streams at high OLR between 5-50 kg COD/m3.day and produce bioenergy suc as biogas and treat the wastewater. Mostly used anaerobic reactor types are listed in the page "Biogas Technologies". In high rate reactors, HRT can be as low as hours to couple of days. Biogas production rates and treatment efficiencies are higher in hifh rate reactors compared to low rate reactors.
Upflow anaerobic sludge blanket(UASB):
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