Presentation of the Best Practice
- Difficult access to water
- Water for irrigation and food production is not available
- Poor quality of treated water
- Agricultural area
- EU funding
- Black Water (BW)
The chemical-physical quality of the digestate, analyzed during the experimentation, showed a high content of ammonia nitrogen present in the digestate compatible with the stripping removal technique.
The principle of the technique is to apply a difference in vapour pressure for ammonia over a hydrophobic gas permeable membrane to transfer gaseous ammonia from the feed digestate solution into a stripping solution in order to produce concentrated ammonium sulphate which can be used as a fertilizer.
The results showed that about 93% of ammonium content in the digestate solution could be transferred to the acid stripping solution.
About 54% of the nitrogen (the rest of 11% was organic nitrogen) present in the digestate is found in ammonia form, which is the fraction more dangerous of the total nitrogen that can be eliminated using this technology.This application is the first in Italy on the livestock manure.
Obstacles to implementation
- Isuffi cient funding instruments to support solution for NCW
- High cost of technological solutions