Effluent odours

I have not yet produced any slurry from my BioDigesters (largest is 10 m³ and operating for about 2 months now). Influent is 20 litres of manure per day soaked in an equal amount of water for 4 hours prior to feeding into the Digester.

In response to a recent discussion with Paul and Simon, Influent was increased 4 days ago to 40 litres of manure per day soaked in 60 liters of water for 4 hours prior to feeding. This to double Biogas production rate and give the BioDigester sufficient incoming liquid volume to push out effluent or slurry.

I expect the slurry to smell BAD -- like sewer water. If this is to be used as a fertilizer, shouldn't something be done to keep it from stinking the area where it is used?

If allowed to settle for awhile, the effluent should separate into a muddy sediment and free-flowing liquid. Do you have any suggestions on handling the free flowing liquid? I want to pass it through a simple waste water treatment process (again to remove its foul odour) before using it to irrigate plants in the farm.