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New technology could capture ammonia from liquid manure
Date:8/11/2011

COLLEGE STATION Though it may not sound very glamorous, a new method of extracting ammonium from liquid animal manure could be exciting news for both confined animal operations and environmental groups, according to a Texas AgriLife Extension Service engineer.

The method uses gas-permeable membrane technology that tests have shown could remove 50 percent of the dissolved ammonium in liquid manure in 20 days. The removed ammonium is "not scrubbed but captured," said Dr. Saqib Mukhtar, AgriLife Extension engineer and interim associate department head of the Texas A&M University department of biological and agricultural engineering.

By captured, Mukhtar means, the ammonium is concentrated as ammonia sulfate compound, which as commercial fertilizer could potentially offset the cost of the removal process.

Though still in the lab-bench test stage, the technology shows great promise to solve a long-standing, expensive well-documented problem that confined-animal feeding operations such as dairies and feedlots face daily, Mukhtar said.

"Excessive ammonia emissions from animal feeding operations are considered a source of odor and environmental pollution," Mukhtar said. "Once emitted, ammonia may contribute to formation of fine airborne particulates in the presence of certain acidic compounds in the atmosphere."

Also, ammonia emissions from improperly managed manure systems may contaminate groundwater and cause excessive vegetative growth in lakes and reservoirs, he said.

"And it may even be a constituent of nitrous oxide, a potent greenhouse gas," he said.

There are other methods of mitigating ammonia emissions from manure storage and treatment facilities, including acidic solution-sprayed scrubbers and bio-filters, and chemicals such as acidified clays and sodium hydrogen sulfate, Mukhtar said.

"Several of these methods have been promising, but high costs, lack of 'staying power' of chemicals an
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Contact: Robert Burns
rd-burns@tamu.edu
903-834-6191
Texas A&M AgriLife Communications
Source:Eurekalert

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