Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 88-95.doi: 10.13475/j.fzxb.20190203308

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Study on cellulose-based flocculant from flax yarn waste and its flocculation performance in treating industrial wastewater

CHEN Dongzhi1, YANG Xiaogang1, CHEN Yanxia1, LIU Lin1, CHEN Bin2, CUI Kecong1, ZHANG Yong1,3   

  1. 1. Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China; 2. Tianjin Changwei Biotechnology Co., Ltd., Tianjin 300300, China; 3. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
  • Received:2019-02-19 Revised:2019-06-20 Online:2020-01-15 Published:2020-01-14

Abstract:

In order to improve the flocculation efficiency and environmental friendliness of commercial flocculants, flax waste cellulose (FC) was grafted with polyacrylamide (PAM) to prepare the FC-g- PAM for partial replacement of the commercial PAM. The morphology and chemical structure of the FC-g-PAM were characterized by FT-IR, field emission scanning electron microscopy, organic element analyzer, X-ray diffractometer and thermogravimetric analysis. Its biodegradability was also investigated. The flocculation performance of the FC-g -PAM in treating wastewater from dyeing, papermaking and mechanical processing were studied. The results showed that the optimal synthesis conditions for preparing FC-g -PAM were: reaction temperature 80 ℃,ammonium persulfate dosage 0. 30 g/ g, PAM dosage 0. 25 g/ g and FC concentration 6%. Thermal stability of FC-g-PAM was demonstrated better than that of FC and 90 d biodegradation rate reached 68.5%. After the flocculation of the FC-g-PAM, the turbidity of treated dyeing wastewater was 17 NTU, chromaticity at 126, supended matter content at 36 mg/ L, CODCr at 372 mg/ L, BOD5 at 132 mg/ L. All these indices of FC-g-PAM indicate better flocculation performance than those of the commercial PAM.

Key words: flax yarn waste, cellulose-based flocculant, flocculation, dyeing wastewater, papermaking wastewater, mechanical processing wastewater

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