Processing of the liquid fraction
Nitrification-denitrification (NDN)
Objective
Biological conversion of ammonium into gaseous nitrogen (N2) combining autotrophic nitrification under aerobic conditions and heterotrophic denitrification under anoxic conditions and the presence of organic carbon
Inlets
Liquid manure (pig and cattle), products from other processes (mainly from separation techniques)
Efficiency
70% nitrogen removal (if the efficiency is evaluated only in the liquid fraction it would be 90%)
Weaknesses
Risk of N2O emissions if the process is not managed well;
A greater amount of sludge is produced compared to anaerobic treatments
A greater amount of sludge is produced compared to anaerobic treatments
Products
Nitrogen gas (N2), sludge
Other outlets
treated water
Consumption
Energy: High
Water: Not applicable
Reagents: Not applicable
Investment
€240000-300000 (plant treating 15000 m³ pig slurry/year; €700000-1.200000 (plant treating 50000 m³ pig slurry/year)
Operation
Depending on the composition of the material to be treated: €1.5-3.0/ton considering only the treatment for the elimination of nitrogen in the slurry; €2.5-5.2/ton considering a previous solid-liquid separation, and the subsequent treatment of the solid fraction through composting
Observations
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Combination with other technologies
1. Separation by pressing -> nitrification-denitrification;
2. Coagulation-flocculation -> Separation by pressure filter -> nitrification-denitrification -> pH increase -> calcium phosphate precipitation;
2. Coagulation-flocculation -> Separation by pressure filter -> nitrification-denitrification -> pH increase -> calcium phosphate precipitation;
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TRL - 9
Status Consolidated
Complexity Medium
Information made by:
BETA Tech Center