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KMID : 1094720130180010135
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Biotechnology and Bioprocess Engineering
2013 Volume.18 No. 1 p.135 ~ p.143
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Deodorization study of the swine manure with two yeast strains
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Yan Zhiying
Liu Xiaofeng
Yuan Yuexiang
Liao Yinzhang
Li Xudong
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Abstract
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With the transition of livestock production from the traditional small household farming to large-scale centralized breeding, the odor pollution caused by livestock manure has become pressing in China. In this study, two yeast strains Y1 and Y2 with high deodorization efficiency were isolated from the sample collected from an outlet in a swine farm in Shuangliu County, Sichuan Province. The scale-up deodorization experiments were carried out for strains Y1, Y2, and their mixture Y1+Y2. The results showed that the reduction rate of treatments on NH3 was in the sequence of Y1+Y2 (35.6 ∼ 68.7%) >Y1 (20.3 ∼ 63.7%) >Y2 (?11.7 ∼ 53.8%). The reduction rate of treatments on H2S was in the sequence of Y1+Y2 (47.2 ∼ 70.1%) > Y2 (36.6 ∼ 60.8%) > Y1 (27.6 ∼ 42.0%). The reduction rate of treatments on total volatile organic compounds (TVOC) was in the sequence of Y1+Y2 (49.1 ∼ 68.3%) > Y1 (36.2 ∼ 54.6%) >Y2 (20.8 ∼ 48.6%). The reduction rate of treatments on odor intensity was in the sequence of Y1+Y2 (27.2?60.3%) > Y1 (16.3 ∼ 38.5%) >Y2 (?0.4 ∼ 35.2%). Furthermore, the concentrations of VFAs, indole, skatole, total nitrogen (TN), organic nitrogen (ON), total sulfur (TS), and ammonium nitrogen (AN) in swine manure during deodorization by yeast strains Y1, Y2, and their mixture Y1+Y2 were assayed. The results showed the concentrations of VFAs, indole, and skatole in the manure with Y1, Y2, and Y1+Y2 treatments were all lower than those of the control group. The concentrations of TN, ON, and TS in treatments were all higher than that of the control group. The concentrations of AN in the treatment groups were all lower than those of the control group.
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KEYWORD
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yeast strains, deodorization, odor intensity, VFAs, swine manure
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