Fig. 1. Changes of gas productivity (a) and methane concentration (b) during the anaerobic digestion of pig and dairy manure slurries
Note: mean±standard errors (n=3)
Fig. 2. Changes of DOM content in the raw and digested pig and dairy manure slurries
Note: Different capital and small letters indicate the significant (p<0.05) differences between the treatments in raw and digested materials, respectively; *** indicate significant (p<0.001) differences between the raw and digested materials. The same below.
Fig. 3. 3DEEM changes of DOM in the raw and digested pig of (a) PM1; (b) PM2; (c) DM1; (d): DM2
Fig. 4. PARAFAC fluorescence components (a) and Fmax (b) of DOM in the raw and digested pig and dairy manure slurries
Fig. 5. Changes of DOM humification index in the raw and digested pig and dairy manure slurries
Note: ** and *** indicate significant (p<0.01, p<0.001) differences between the raw and digested pig and dairy manure slurries, respectively
指标 | 猪粪水 | 奶牛粪水 | 接种污泥 |
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pH | 7.5±0.1 | 8.8±0.1 | 8.2±0.1 | TS/% | 32.7±0.3 | 15.4±0.7 | 3.5±0.3 | VS/% | 71.2±2.6 | 66.8±1.2 | 53.1±0.5 | TOC/(g·kg-1 DW) | 371.3±3.7 | 383.7±19.6 | 321.1±7.6 | TN/(g·kg-1 DW) | 25.5±0.1 | 13.1±0.4 | 23.4±0.3 | C/N比 | 14.6 | 29.3 | 13.7 |
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Table 1. Basic characteristics of the raw materials
处理代码 | 原料类型 | TS/% | 质量/g |
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原料 | 污泥 | 蒸馏水 |
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PM1 | 猪粪水 | 4.0 | 15.4 | 37.8 | 72.8 | PM2 | 猪粪水 | 8.0 | 30.8 | 37.8 | 57.4 | DM1 | 奶牛粪水 | 4.0 | 32.8 | 37.8 | 55.4 | DM2 | 奶牛粪水 | 8.0 | 65.6 | 37.8 | 22.6 |
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Table 2. The raw material ratios in the experimental treatments
归属 | 标号 | Ex/nm | Em/nm |
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类胡敏酸 | A | 250~400 | 380~500 | 可溶性微生物副产物 | B | 250~400 | 280~380 | 类富里酸 | C | 220~250 | 380~450 | 类色氨酸 | D | 220~250 | 330~380 | 类酪氨酸 | E | 220~250 | 280~330 |
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Table 3. Fluorescence peak division and attribution of EEM in the raw and digested manure slurries