This sounds like a trick ...

Published by

This sounds like a trick question - a COD of 300 000 mg/l must be almost pure blood or waste from an abattoir or tannery?  Reduce the pH by adding acid and put it into an anaerobic digester.  19 m3/day is not too much - you could consider an evaporation pond, but it is likely to cause very unpleasant odours. Please let us know what the waste is.