Wen Zhang, Ph.D., P.E., BCEE
Principal Investigator
Professor
Phone: (973) 596-5520
Fax: (973) 596-5790
Email: wen.zhang@njit.edu
Office Location: Colton Hall 211
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中文摘要
近期该合作团队于Separation and purification technology发表研究论文并报道了一种新的除藻工艺。该研究利用壳聚糖改性植物纤维与Fe3+联合使用高效去除铜绿微囊藻及MC-LR。结果表明，壳聚糖改性植物纤维对藻类具有显著的吸附能力。在没有藻源型有机物(AOM)的情况下，当用量为26.7g纤维/g藻类(干重)时，藻类的去除率达到100%；然而，在相同的植物纤维用量下，AOM(8.13 mg·L-1)的存在显著地降低了壳聚糖改性植物纤维的吸附作用，藻类细胞的去除率仅达到3.2±3.0%。当加入浓度为11.2 mg·L-1 Fe3+ ( FeCl3)时，由于壳聚糖改性植物纤维和细胞之间的能量障碍减少，AOM的抑制作用大大降低，相同壳聚糖改性植物纤维用量条件下，铜绿微囊藻去除率高达95%。此外，当Fe3+浓度增加到16.8 mg·L-1时，79%的MC-LR同时被去除。因此，将Fe3+与壳聚糖改性植物纤维结合起来，可以有效地提高对铜绿微囊藻和MC-LR的去除。
纤维由于具备良好的分离性与循环利用性，纤维吸附藻后可通过高效沉降或筛网分离再利用，3次循环使用后，除藻效率下降不超过3%。该研究有望开发一种低成本绿色的除藻新工艺。
第一作者：刘明盟
通讯作者：张学治、张文
通讯单位：中国科学院水生生物研究所和新泽西理工大学
论文DOI：https://doi.org/10.1016/j.seppur.2022.122889
英文简介
Professor Wen Zhang and Professor Xuezhi Zhang jointly reported a novel process for algal removal. In this study, chitosan modified cellulose fibers (NH2-CF) were developed as a green adsorbent for the simultaneous removal of a model algae cell, Microcystis aeruginosa, and microcystin-LR (MC-LR). The results showed that the chitosan (CTS) modification could increase the adsorption affinity toward algae. In the absence of algogenic organic matter (AOM), the algae removal reached 100% at a dosage of 26.7 g-NH2-CF/g-algae (dry weight); however, at the same CF dosage, the presence of AOM (8.13 mg-carbon·L-1) strongly reduced the adsorption by NH2-CF and removal rate of algae cells reached only 3.2±3.0%. When adding FeCl3 or Fe3+ at a concentration of 11.2 mg-Fe·L-1, the inhibitory effect of AOM was dramatically reduced as indicated by the improved algae removal up to 95% at an NH2-CF dosage of 20.45 g·g-1, because of the reduced energy barrier between NH2-CF and cells. Moreover, when the Fe3+ concentration was increased to 16.8 mg·L-1, 79% of MC-LR was simultaneously removed. Thus, combining Fe3+ with NH2-CF is proven effective to enhance the adsorption and removal of Microcystis aeruginosa and MC-LR and achieve a sustainable mitigation of HABs.
Due to the excellent separability and recyclability of NH2-CF, the adsorbed algae can be easily separated by settlement or mesh. After three consecutive cycles, the algae removal efficiency underwent a minor decrease by around 3% only. This study lays foundation for developing a cost- environmental algal mitigation processes.
This work was partially supported by the National Key R&D Program "Intergovernmental International Science and Technology Innovation Cooperation” of China (2018YFE0110600), New Jersey Department of Environmental Pollution (NJDEP)’s Prevent, Mitigate and/or Control of Freshwater Harmful Algae Blooms (HABs) Grant (Award Number: 1343716), and the Features Institute Service Projects from the Institute of Hydrobiology, the Chinese Academy of Sciences (Y85Z02-1-3-1).
中国科学院水生生物研究所张学治研究员团队报道改性植物纤维与Fe3+对铜绿微囊藻及MC-LR的同时高效去除及其机制
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