Effects of pH, Urinary Nitrogen Content and Addition of an Odour Control Additive on In Vitro Ammonia Emission from Pig Manure

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  • YAMAMOTO Akemi
    Institute of Livestock Industry’s Environmental Technology, Livestock Industry’s Environmental Improvement Organization
  • ITOH Minoru
    Institute of Livestock Industry’s Environmental Technology, Livestock Industry’s Environmental Improvement Organization
  • FURUYA Shu
    Institute of Livestock Industry’s Environmental Technology, Livestock Industry’s Environmental Improvement Organization

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  • 豚糞尿混合物のｐＨ，尿中窒素含量および脱臭資材の添加がｉｎ　ｖｉｔｒｏアンモニア揮散量に及ぼす影響
  • ブタ フンニョウ コンゴウブツ ノ pH ニョウ チュウ チッソ ガンリョウ オヨビ ダッシュウ シザイ ノ テンカ ガ in vitro アンモニアキサンリョウ ニ オヨボス エイキョウ

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Abstract

Effects of pH and urinary nitrogen content on ammonia emission from pig manure was investigated with an in vitro procedure. Also, the effect of addition of an odour control additive was tested. In experiment 1, pH of pig manure, the mixture of faeces (40g) and urine (160g), was adjusted to six levels ranged from pH 4 to 9, and ammonia emissions from the manure during 24h incubation and ammonia remained in the manure after the incubation were determined. The average ammonia (ammoniacal nitrogen)emissions for pH 4, 5, 6, 7, 8 and 9 at the beginning of the incubation were 0, 19, 32, 53, 58 and 67mg/d, respectively. The ammoniacal nitrogen remained in the manure after the incubation was much lower for the pH 4, 500mg, than that for the pH 5 to 9, approximately 1,200mg. In experiment 2, the effect of urinary nitrogen content was investigated with use of six urine samples ranging from 2.6 to 9.6mg/g. Ammonia emission during 24h incubation was linearly increased with the increase of urinary nitrogen content. In experiment 3, the in vitro procedure was used to evaluate the performance of a commercial chemical additive (powder, unknown composition) on reducing ammonia emission. The additive was added to the manure at four rates (0, 0.5, 1.0 and 1.5%). The average ammonia emissions from the manure during 48h incubation for 0.5, 1.0 and 1.5% addition of the additive were reduced by 27, 54 and 60%, respectively, in comparison to emission from the untreated manure. The pH of the manure at the beginning of incubation was decreased with the increase of addition rate of the additive ; pH for 1.5% addition, 6.06, was lower by 0.71 unit than that for the control, 6.77. The reduced ammonia emission with addition of the additive may be caused by a lowering effect of this product on the incubation pH.

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