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Your search keyword '"Shi, Shaoyuan"' showing total 31 results
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31 results on '"Shi, Shaoyuan"'

19. GO–Polymer Modified Anion Exchange Membranes for Antifouling.

Author

Li, Yujiao, Cao, Renqiang, Shi, Shaoyuan, and Cao, Hongbin

Abstract

Organic fouling was one of key issues limiting the application of electrodialysis in the treatment of industrial wastewater, which results in degradation of membranes and high energy consumption. In this study, a novel graphene oxide (GO)–polymer modified anion exchange membrane (AEM) for antiorganic fouling was first developed by layer-by-layer interfacial polymerization (IP). The surface of AEM was alternately contacted with GO and tannic acid (TA) aqueous as the water phase and an n-hexane solution of trimesoyl chloride (TMC) as the organic phase; thus, a multilayer GO–polymer structure was fabricated on the surface of AEM. Results showed that the aqueous phase was preferred to be the final treatment of layer-by-layer interfacial polymerization, which was more conducive to enhancing hydrophilicity and negative charge density of the membrane surface. Compared with TA-TMC modified AEM, the introduction of GO nanosheets with carboxyl groups into aqueous solution significantly increased the negative charge density of the membrane surface and reduced membrane resistance. The desalination rate of (GOTA-TMC)1.5 was mostly close to that of pristine AEM without fouling, exhibiting significant antifouling performance and good stability. The study provides promising insights into the modification of ion exchange membranes with functional materials and a polymer composite layer. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Bipolar Membrane Electrodialysis for Ammonia Recovery from Synthetic Urine: Experiments, Modeling, and Performance Analysis

Author

Li, Yujiao, Wang, Ruoyu, Shi, Shaoyuan, Cao, Hongbin, Yip, Ngai Yin, and Lin, Shihong

Subjects
Recycling (Waste, etc.), FOS: Environmental engineering, Electrodialysis, Environmental engineering, Membrane separation
Abstract

Recovering nitrogen from source-separated urine is an important part of the sustainable nitrogen management. A novel bipolar membrane electrodialysis with membrane contactor (BMED���MC) process is demonstrated here for efficient recovery of ammonia from synthetic source-separated urine (���3772 mg N L���1). In a BMED���MC process, electrically driven water dissociation in a bipolar membrane simultaneously increases the pH of the urine stream and produces an acid stream for ammonia stripping. With the increased pH of urine, ammonia transports across the gas-permeable membrane in the membrane contactor and is recovered by the acid stream as ammonium sulfate that can be directly used as fertilizer. Our results obtained using batch experiments demonstrate that the BMED���MC process can achieve 90% recovery. The average ammonia flux and the specific energy consumption can be regulated by varying the current density. At a current density of 20 mA cm���2, the energy required to achieve a 67.5% ammonia recovery in a 7 h batch mode is 92.8 MJ kg���1 N for a bench-scale system with one membrane stack and can approach 25.8 MJ kg���1 N for large-scale systems with multiple membrane stacks, with an average ammonia flux of 2.2 mol m���2 h���1. Modeling results show that a continuous BMED���MC process can achieve a 90% ammonia recovery with a lower energy consumption (i.e., 12.5 MJ kg���1 N). BMED���MC shows significant potential for ammonia recovery from source-separated urine as it is relatively energy-efficient and requires no external acid solution.

Published
2021
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