Dear Dorna, I am guessing ...

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Dear Dorna,

I am guessing your  Dairy farm Wastewater have a high content of COD, more them 1,000 mg/l?

If so, you may chose AD as pre-treatment like an ABR (biogas!!!) and after that an aerobic secondary treatment system like CW or a pond system. See https://www.sswm.info/water-nutrient-cycle/wastewater-treatment/hardwares/semi-centralised-wastewater-treatments/anaerobic-baffled-reactor-%28abr%29

Good luck

Detlef