Effect of acid and alkali pretreatment on anaerobic co-digestion characteristics of pepper straw and sheep manure

doi:10.3969/j.issn.1004-1524.2021.10.15

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (10): 1913-1920.DOI: 10.3969/j.issn.1004-1524.2021.10.15

• Environmental Science • Previous Articles Next Articles

Effect of acid and alkali pretreatment on anaerobic co-digestion characteristics of pepper straw and sheep manure

MENG Yan(), LIU Li, LI Yi, CHEN Laisheng, DU Zhongping, HAN Rui^*()

Qinghai Key Laboratory of Vegetable Genetics and Physiology, Academy of Agriculture and Forestry Sciences, Qinghai University, Xining 810016, China

Received:2021-03-12 Online:2021-10-25 Published:2021-11-02
Contact: HAN Rui

Abstract

Abstract:

To realize resource utilization of agricultural wastes, batch anaerobic fermentation experiments were performed to compare the effects of H₂SO₄ pretreatment (volume fraction of 2%, 4%, 6%, 8%) and Ca(OH)₂ pretreatment (mass fraction of 2%, 4%, 6%, 8%) of pepper straw on the characteristics of methane production during anaerobic co-digestion of pepper straw and sheep manure. It was shown that methane yield in the anaerobic fermentation increased with higher Ca(OH)₂ mass fraction in the pretreatment, and the maximum methane yield of 188.56 mL·g^-1 was achieved with 8% Ca(OH)₂ pretreatment, which was significantly (P<0.05) higher than those of the other treatments, and the methane yield was 61.26% higher than that of control. In contrast, the increased volume fraction of H₂SO₄ in pretreatment resulted in reduced methane yield, all of which were significantly (P<0.05) lower than that of control. The modified Gompertz model could fit the methanogenesis process. The maximum methane yield (V_m) was higher with Ca(OH)₂ pretreatment, which indicated that the pretreatment of pepper straw with Ca(OH)₂ could effectively increase the hydrolysis rate. Moreover, both acid and alkali pretreatment exhibited a certain degradation effect on the lignocellulose of pepper straw, yet Ca(OH)₂ pretreatment showed higher degradation effect.

Key words: acid pretreatment, alkali pretreatment, pepper straw, anaerobic co-digestion, methane

CLC Number:

MENG Yan, LIU Li, LI Yi, CHEN Laisheng, DU Zhongping, HAN Rui. Effect of acid and alkali pretreatment on anaerobic co-digestion characteristics of pepper straw and sheep manure[J]. Acta Agriculturae Zhejiangensis, 2021, 33(10): 1913-1920.

Figures/Tables 10

References 35

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物料 Material	pH值 pH value	总固体 TS/%	挥发性固体 VS/%	总碳 TC/%	总氮 TN/%
羊粪Sheep manure	7.81±0.13	45.78±4.98	32.59±2.24	34.14±0.15	2.15±0.31
辣椒秸秆Pepper stalk	—	93.80±0.28	90.83±0.33	38.79±0.21	1.95±0.28
接种污泥Inoculum sludge	7.52±0.05	11.09±1.28	8.35±0.27	13.77±0.56	1.51±0.42

物料 Material	pH值 pH value	总固体 TS/%	挥发性固体 VS/%	总碳 TC/%	总氮 TN/%
羊粪Sheep manure	7.81±0.13	45.78±4.98	32.59±2.24	34.14±0.15	2.15±0.31
辣椒秸秆Pepper stalk	—	93.80±0.28	90.83±0.33	38.79±0.21	1.95±0.28
接种污泥Inoculum sludge	7.52±0.05	11.09±1.28	8.35±0.27	13.77±0.56	1.51±0.42

处理 Treatment	辣椒秸秆 Pepper stalk/g	羊粪 Sheep manure/g	接种污泥 Inoculum sludge/g	去离子水 Deionised water/mL
CK	4.40	9.61	281.11	104.88
S1	4.26	9.31	283.84	102.59
S2	4.27	9.32	281.61	104.80
S3	4.24	9.27	284.15	102.34
S4	4.24	9.24	284.39	102.13
J1	4.31	9.41	283.05	103.23
J2	4.26	9.30	279.56	106.88
J3	4.28	9.35	283.59	102.78
J4	4.23	9.25	284.32	102.20

处理 Treatment	辣椒秸秆 Pepper stalk/g	羊粪 Sheep manure/g	接种污泥 Inoculum sludge/g	去离子水 Deionised water/mL
CK	4.40	9.61	281.11	104.88
S1	4.26	9.31	283.84	102.59
S2	4.27	9.32	281.61	104.80
S3	4.24	9.27	284.15	102.34
S4	4.24	9.24	284.39	102.13
J1	4.31	9.41	283.05	103.23
J2	4.26	9.30	279.56	106.88
J3	4.28	9.35	283.59	102.78
J4	4.23	9.25	284.32	102.20

处理 Treatment	实际甲烷产率 Actual methane yield/(mL·g^-1)	V_m/(mL·g^-1)	R_m/(mL·g^-1)	R²
CK	116.93	114.89	8.93	0.986
S1	109.62	106.61	6.31	0.991
S2	106.31	102.95	7.66	0.990
S3	78.03	76.29	4.83	0.984
S4	77.31	75.20	4.34	0.981
J1	132.29	126.27	9.67	0.982
J2	147.20	140.72	9.95	0.984
J3	157.21	151.72	20.76	0.991
J4	188.56	181.02	19.76	0.992

Effect of acid and alkali pretreatment on anaerobic co-digestion characteristics of pepper straw and sheep manure

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处理 Treatment	木质素 Lignin/%	纤维素 Cellulose/%	半纤维素 Semi-cellulose/%
CK	14.01±1.42 a	37.94±2.11 a	23.26±1.43 a
S1	13.89±0.84 a	24.14±1.32 d	19.08±0.62 c
S2	12.33±0.73 b	25.56±1.34 c	19.75±0.76 bc
S3	12.97±0.81 b	21.13±1.52 e	13.90±1.12 f
S4	12.70±0.62 b	27.10±2.45 b	15.20±1.40 e
J1	9.53±0.45 c	12.08±0.77 h	18.20±0.42 d
J2	8.84±0.56 d	9.85±0.65 i	17.81±0.12 d
J3	8.74±0.65 d	13.89±0.63 g	17.87±0.52 d
J4	7.04±0.44 e	14.46±1.22 f	20.14±1.03 b

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