Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 89-94.doi: 10.13475/j.fzxb.20191204906

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Study on process performance of ramie fiber anaerobic biological degumming system

LIU Fang1, MA Yanxue2,3, CHEN Xiaoguang1,4(), LIU Shuhui3, ZHANG Yizhen1, REN Zhipeng1, LI Kangqi1, TONG Yixuan3, REN Luotong1, LI Yuling2,3   

  1. 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China
    3. College of Textiles, Donghua University, Shanghai 201620, China
    4. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
  • Received:2019-12-23 Revised:2020-06-15 Online:2020-11-15 Published:2020-11-26
  • Contact: CHEN Xiaoguang E-mail:cxg@dhu.edu.cn

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Abstract:

In order to solve the problems of low efficiency, high cost and secondary pollution in traditional degumming of ramie fiber, a high efficiency ramie fiber anaerobic degumming system was developed using a self-developed high efficiency ramie fiber anaerobic degumming device as the carrier. Based on chemical composition analysis of the raw ramie, the characteristics of the start-up and stable operation stages of ramie fiber anaerobic biological degumming process were studied, and the physical characteristics of the degummed ramie fiber were analyzed. It was found that cellulose and gelatine account for about 70% and 30% respectively in the raw ramie, and that the hemicellulose and lignin should be removed firstly in the degumming process. The system can start up rapidly within 72 hours of hydraulic retention time, and when it runs efficiently and stably, the pH is about 7.0, and chemical oxygen demand and ammonia nitrogen concentration are both at low levels. The ramie fiber has the best physical characteristics when the optimal water bath ratio is 1∶8, under which the ramie fiber has good appearance and mechanical properties, and the residue of gelatine is minimal.

Key words: ramie, spiral symmetry stream anaerobic bioreactor, biological degumming, cellulose, pectin

CLC Number: 

  • TS123.2

Fig.1

Process flow of anaerobic biological degumming system for ramie fiber"

Tab.1

Detailed rules for evaluation and grading of appearance and morphology of ramie after degumming"

指标 评价 评分标准
色泽 洁白有光泽 8~10
较黄略有光泽 5~7
黄褐色 0~4
柔软度 手感柔软顺滑 8~10
较柔软 5~7
手感较硬 0~4
夹生、硬块硬条 均匀无夹生、没有硬块硬条 8~10
较少夹生、硬块硬条较少 5~7
较多夹生、硬块硬条较多 0~4
碎麻 手感强力好,无碎麻 8~10
较少碎麻 5~7
手感强力低、较多碎麻 0~4
斑疵 纤维质量均匀、无斑疵 8~10
有褐色病斑、疵点 5~7
较多的褐色病斑、疵点 0~4

Tab.2

Chemical composition analysis of raw ramie%"

纤维素 半纤维素 果胶 水溶物 灰分 木质素 脂蜡质
70.03 13.16 4.72 4.68 3.94 2.37 1.10

Fig.2

Variation curves of pH, COD and ammonia nitrogen concentration during the start-up of ramie fiber degumming system"

Fig.3

Variation curves of pH, COD and ammonia nitrogen concentration during operation of ramie fiber degumming system"

Tab.3

Evaluation results of fiber appearance and morphology after degumming of ramie by different water bath ratio"

浴比 评分 总分
色泽 柔软度 夹生、硬块硬条 斑疵 碎麻
1∶13 6.73±0.22 5.63±0.59 5.13±0.57 7.40±0.27 6.80±0.37 31.69±2.02
1∶10 6.40±0.29 4.93±0.35 4.53±0.25 6.48±0.31 5.68±0.34 28.02±1.54
1∶8 7.73±0.22 6.25±0.24 4.90±0.34 6.90±0.50 5.80±0.36 31.58±1.66
1∶6 4.30±0.24 3.50±0.73 4.75±0.76 6.23±0.48 6.88±0.46 25.66±2.67

Tab.4

Physical and mechanical properties of ramie after degumming by different water bath ratio"

浴比 线密度/
dtex		 强度/
(cN·dtex-1)		 质量
损失率/%		 脱胶率/
%
1∶13 5.50 9.79 26.90 63.50
1∶10 6.00 7.18 25.30 62.36
1∶8 6.80 6.21 31.70 65.87
1∶6 7.60 5.87 29.88 60.39

Fig.4

Infrared spectrum analysis of ramie after degumming by different water bath ratio"

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