I agree, The rule of thumb cut off value is 2000 BOD which i use. Less than 2000, use aerobic systems like activated sludge of fixed film technologies. Greater than 2000 is a candidate for anaerobic treatment. There are many anaerobic alternatives including low rate and high rate like USAB and MFT. To  reuse water follow activated sludge treatment call secondary effluent by with a multi-media or micro filtration the RO. Anaerobic may need an activated sludge and then membrane and RO. Post secondary depends upon water quality needed.

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I agree, The rule of thumb cut off value is 2000 BOD which i use. Less than 2000, use aerobic systems like activated sludge of fixed film technologies. Greater than 2000 is a candidate for anaerobic treatment. There are many anaerobic alternatives including low rate and high rate like USAB and MFT. To  reuse water follow activated sludge treatment call secondary effluent by with a multi-media or micro filtration the RO. Anaerobic may need an activated sludge and then membrane and RO. Post secondary depends upon water quality needed.