Processing of the liquid fraction
Concentration by vacuum evaporation
Objective
Concentration of nutrients and organic matter through the evaporation of water at a temperature below 100ºC and at pressures below the vapor pressure of the liquid
Inlets
Water flow from other processes (see combination with other technologies)
Efficiency
Concentrate with a solids content of 25-35%; more than 98% nitrogen recovery if the pH is kept below 5.5
Weaknesses
The presence of heavy metals in the concentrate can limit the application of the product in the field;
Need for reagents (strong acids) to maintain the pH at 5.5 and ensure N recovery;
Forms of sulfur may appear in the condensate if acidification is carried out with sulfuric acid);
Need for reagents (strong acids) to maintain the pH at 5.5 and ensure N recovery;
Forms of sulfur may appear in the condensate if acidification is carried out with sulfuric acid);
Products
Concentrate (nutrients in the form of ammonium, organic matter)
Other outlets
Condensate (water vapor)
Consumption
Energy: Medium
Water: Not applicable
Reagents: Low
Investment
Not available
Operation
Not available
Observations
Choose materials resistant to high temperatures and low pHs (quality stainless steel > 316 L);
Need for operator training to avoid accidents due to working with strong acids.
Need for operator training to avoid accidents due to working with strong acids.
Combination with other technologies
1. Coagulation-flocculation or Separation by centrifugation -> microfiltration -> reverse osmosis -> vacuum evaporation;
2. Coagulation-flocculation or Separation by centrifugation -> microfiltration -> vacuum evaporation;
2. Coagulation-flocculation or Separation by centrifugation -> microfiltration -> vacuum evaporation;
Download the file here
TRL - 9
Status Consolidated
Complexity High
Information made by:
BETA Tech Center