Nutrient recovery process

Patent metadata

Field	Value
Publication number	US-9045355-B2
Application number	US-201313832737-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Jun 2, 2015
Grant date	Jun 2, 2015

Abstract

An apparatus for recovering nutrients from digestate comprises one or more solid-liquid separation steps, and dryer, an ammonia stripping device, and an evaporator. In a process, digestate is separated into a solids portion and a liquid portion. Ammonia is stripped from the liquid portion and converted into an ammonium solution or salt which may be used as, or blended with, a fertilizer product. At least part of the remaining liquid portion is concentrated to produce brine. The brine is mixed with the solids portion. The mixture is dried and may be used as, or blended with, a fertilizer product.

First claim

We claim:

1. process comprising steps of,
a) recovering solids and liquid from an anaerobic digester digestate;
b) stripping ammonia from the liquid to produce an ammonia stripped liquid;
c) concentrating at least some of the ammonia stripped liquid to produce a brine;
d) mixing the brine with the solids; and,
e) drying the brine and solids mixture.

2. The process of claim 1 wherein step a) comprises two solid-liquid separation steps.…

Assignees

• Anaergia Inc

Inventors

• Kumar Ashwani
• Josse Juan Carlos

Classifications

• C05F17/50

  Chemistry & Metallurgy · mapped topic

• C05F17/10

  Chemistry & Metallurgy · mapped topic

• C05F17/40

  Chemistry & Metallurgy · mapped topic

• C05F17/15

  Chemistry & Metallurgy · mapped topic

• C02F2209/14

  Chemistry & Metallurgy · mapped topic