Anaerobic treatment system for palm oil mill effluent

We are looking for a treatment technology with the smallest footprint possible for palm oil mill effluent in Indonesia. The wastewater parameters are: COD : 50000ppm TSS : 20000ppm FOG : 5000 PH : 4-5 Please tell us about which treatment system would be perfect for us with above specifications.  Expected flowrate is 360-400m3/day