Method and system for compounding fertilizer from manure without nutrient emission

A system to generate a nutrient concentrate, the system comprising:

• a centrifuge to produce each of a liquid and a solid fraction emerging from the centrifuge as a result of centrifuging a centrifuge feed of dairy manure, the centrifuge being operated such that:
• the solid fraction emerging from the centrifuge has a solid fraction volume of between 15 and 50% of the volume of the centrifuge feed of dairy manure, and
• the liquid fraction emerging from the centrifuge has a liquid fraction volume of between 50 and 85% of the volume of the centrifuge feed of dairy manure;
• a mechanical vapor recompressor evaporator (“MVR”) to evaporate the liquid fraction to produce a nutrient concentrate and a condensate, the condensate comprising ammonia-laden water vapor;
• and
• a blower to generate an air flow to entrain the ammonia-laden water vapor, thereby to convey the ammonia-laden water vapor to an ammonia stripping vessel.

A system for producing fertilizer from dairy manure, the system comprising:

• a centrifuge for dewatering dairy manure to produce each of a liquid fraction and a solid fraction:
• the solid fraction emerging from the centrifuge has a solid fraction volume of between 15 and 50% of the volume of the centrifuge feed of dairy manure, and
• the liquid fraction emerging from the centrifuge has a liquid fraction volume of between 50 and 85% of the volume of the centrifuge feed of dairy manure;
• and
• a mechanical vapor recompressor evaporator (“MVR”) to evaporate the liquid fraction to produce a nutrient concentrate and a condensate, the condensate comprising ammonia-laden water.

A method for compounding fertilizer from liquid manure without releasing nutrients into the ambient environment, the method comprising:

• centrifugally separating liquid manure into nutrients as a liquid centrate and a generally organic matter cake:
• evaporating a vapor containing ammonia from the liquid centrate by means of mechanical vapor recompression (MVR) to produce a nutrient sludge;
• and
• producing a combustible gas by either one of digesting or gasifying the generally organic matter cake.