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1 材料与方法
1.1 实验材料
Table 1 Physicochemical properties of corn straw and municipal sludge
材料 | TS/% | VS/% | C/% | N/% | C/N | pH |
秸秆 污泥 | 93.6 4.8 | 76.4 2.9 | 45.17 25.85 | 0.63 5.25 | 71.70 4.92 | — 6.72 |
Table 2 Physical and chemical properties of slurry
pH | sCOD/(mg·L−1) | NH4+-N/(mg·L−1) |
7.20 | 600 | 237.88 |
1.2 实验装置
1.3 实验方法
s=v1v1+v2×100%
| (1) |
Table 3 Experimental design of batch fermentation
沼液回流率/% | 市政污泥/mL | 预处理秸秆混合液/mL | 沼液/mL | 接种泥/mL |
0 | 83.50 | 66.50 | 0 | 350 |
20 | 83.50 | 53.20 | 13.30 | 350 |
30 | 83.50 | 46.55 | 19.95 | 350 |
40 | 83.50 | 39.90 | 26.60 | 350 |
50 | 83.50 | 33.25 | 33.25 | 350 |
60 | 83.50 | 26.60 | 39.90 | 350 |
1.4 分析方法
2 结果与讨论
2.1 不同沼液回流量对厌氧消化pH的影响
Fig. 1 Change of pH with time

2.2 不同沼液回流量对厌氧消化产气量的影响
Fig. 2 Volume change of daily biogas with time

Fig. 3 Volume change of accumulated biogas with time

2.3 不同沼液回流量对厌氧消化产气中甲烷含量的影响
Fig. 4 Change of methane content with time

2.4 不同沼液回流量对厌氧消化反应前后TS、VS的影响
Fig. 5 Change of TS in reaction

Fig. 6 Change of VS in reaction

2.5 不同沼液回流量对厌氧消化过程中VFAs的影响
Fig. 7 Change of VFAs with time

Fig. 8 Change of acetic acid with time

Fig. 9 Change of propionic acid with time

2.6 不同沼液回流量对厌氧消化过程中sCOD、氨氮的影响
Fig. 10 Change of sCOD with time

Fig. 11 Change of ammonia nitrogen with time
