Straw Fiber Pretreated by Microorganism: Pulp Structure, Fiber Morphology and Film-Forming Properties

doi:10.11924/j.issn.1000-6850.casb2021-0816

Abstract

Abstract:

In order to study the effect of biological pretreatment on straw fiber dissociation and promote fiber separation and film formation in pulping process, the effects of microbial inoculation amount and fermentation time on chemical composition, fiber morphology and film mechanical properties of straw fiber were studied by laboratory simulated fermentation. The results showed that, the degradation rate of rice straw treated with 1% exogenous bacteria reached 20% after 14 days, and the fiber degradation was moderate, and the proportion of fine fiber was only 59.63%-67.91%, compared with the control group. The interlacing force among fibers was enhanced, and the effect of fiber dissolution and separation was improved, which led to the energy consumption of beating decreased by 71.54%. In addition, with the prolonging of fermentation time, the tensile strength of fiber film increased first and then decreased, which increased by 7.6% and 4.64% on day 7 and day 14, respectively. When treated with 3% inoculation amount for 14 days, the weight average and weight of slurry increased by 28.57% and 49.36% respectively, and the fiber film tear rate reached 240.9 mN. The conclusions are as follows: there is no significant correlation between tensile strength and fiber mass, but a negative correlation between bursting strength and weighted fiber length, while there is a significantly positive correlation between tear strength and average fiber length, weight average and length-width ratio. This study provides technical support for the development and application of biodegradable straw fiber mulching film.

Key words: microorganism, pretreatment, rice straw pulping, fiber morphology, mulch film, mechanical properties

CLC Number:

S282

FAN Xiaodong, ZHANG Yue, WU Zengyou, YONG Cheng, QU Ping, HUANG Hongying, XU Yueding, SUN Enhui. Straw Fiber Pretreated by Microorganism: Pulp Structure, Fiber Morphology and Film-Forming Properties[J]. Chinese Agricultural Science Bulletin, 2022, 38(15): 69-77.

Figures/Tables 10

References 31

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处理		纤维平均长度/mm			细小纤维含量/%	长宽比
接种量/%	发酵时间/d	数均长度	重均长度	质量加权	细小纤维含量/%	长宽比
0	7	0.369	0.481	0.680	73.01	12.95
	14	0.364	0.468	0.640	72.21	12.73
	21	0.371	0.497	0.693	71.64	12.74
1	7	0.362	0.456	0.622	59.53	11.56
	14	0.371	0.487	0.715	67.91	12.65
	21	0.363	0.461	0.623	66.24	13.30
3	7	0.361	0.460	0.632	67.29	11.62
	14	0.387	0.531	0.814	71.76	14.64
	21	0.376	0.495	0.696	69.50	14.40
5	7	0.360	0.480	0.747	68.86	11.36
	14	0.366	0.467	0.636	70.29	13.32
	21	0.362	0.460	0.617	69.05	13.09
未发酵秸秆		0.339	0.413	0.545	70.76	11.36
木浆纤维		0.765	1.425	2.108	33.74	28.82

处理		纤维平均长度/mm			细小纤维含量/%	长宽比
接种量/%	发酵时间/d	数均长度	重均长度	质量加权	细小纤维含量/%	长宽比
0	7	0.369	0.481	0.680	73.01	12.95
	14	0.364	0.468	0.640	72.21	12.73
	21	0.371	0.497	0.693	71.64	12.74
1	7	0.362	0.456	0.622	59.53	11.56
	14	0.371	0.487	0.715	67.91	12.65
	21	0.363	0.461	0.623	66.24	13.30
3	7	0.361	0.460	0.632	67.29	11.62
	14	0.387	0.531	0.814	71.76	14.64
	21	0.376	0.495	0.696	69.50	14.40
5	7	0.360	0.480	0.747	68.86	11.36
	14	0.366	0.467	0.636	70.29	13.32
	21	0.362	0.460	0.617	69.05	13.09
未发酵秸秆		0.339	0.413	0.545	70.76	11.36
木浆纤维		0.765	1.425	2.108	33.74	28.82

		数均长度	重均长度	质量加权长度	细小纤维含量	长宽比
抗张强度	Pearson相关系数	0.527	0.483	0.439	-0.137	0.347
抗张强度	显著性检验	0.079	0.112	0.153	0.671	0.269
耐破度	Pearson相关系数	-0.063	-0.397	-0.598^*	-0.360	0.114
耐破度	显著性检验	0.845	0.201	0.040	0.250	0.725
撕裂度	Pearson相关系数	0.798^**	0.595^*	0.407	0.321	0.720^**
撕裂度	显著性检验	0.002	0.041	0.189	0.309	0.008

		数均长度	重均长度	质量加权长度	细小纤维含量	长宽比
抗张强度	Pearson相关系数	0.527	0.483	0.439	-0.137	0.347
抗张强度	显著性检验	0.079	0.112	0.153	0.671	0.269
耐破度	Pearson相关系数	-0.063	-0.397	-0.598^*	-0.360	0.114
耐破度	显著性检验	0.845	0.201	0.040	0.250	0.725
撕裂度	Pearson相关系数	0.798^**	0.595^*	0.407	0.321	0.720^**
撕裂度	显著性检验	0.002	0.041	0.189	0.309	0.008