期刊：
Separation and Purification Technology,2022年285:120386 ISSN：1383-5866
通讯作者：
Shiquan Sun<&wdkj&>Xi Hu
作者机构：
[Zhou, Lu; Lv, Jundong; Chen, Hong; Zhu, Xiaofang; Wu, Haipeng; Sun, Shiquan; Chi, Tianying] Changsha Univ Sci & Technol, Sch Hydraul & Environm Engn, Changsha 410114, Peoples R China.;[Zhou, Lu; Chen, Hong; Wu, Haipeng; Sun, Shiquan] Key Lab Water Sediment Sci & Water Disaster Preve, Changsha 410114, Peoples R China.;[Lv, Jundong; Zhu, Xiaofang; Chi, Tianying] Key Lab Dongting Lake Aquat Ecoenvironm Control &, Changsha 410114, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Hu, Xi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Shiquan Sun] S;[Xi Hu] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China<&wdkj&>School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, PR China<&wdkj&>Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, PR China
关键词：
Adsorption-reduction;Cr(VI);Iron-clay biochar;Populus nigra
摘要：
Simultaneous anammox and denitrification (SAD) is an efficient approach to treat wastewater having a low C/N ratio; however, few studies have investigated a combination of SAD and partial nitritation (PN). In this study, a lab-scale up-flow blanket filter (UBF) and zeolite sequence batch reactor (ZSBR) were continuously operated to implement SAD and PN advantages, respectively. The UBF achieved a high total nitrogen (TN) removal efficiency of over 70% during the start-up stage (days 1-50), and reached a TN removal efficiency of 96% in the following 90 days (days 51-140) at COD/NH4+-N ratio of 2.5. The absolute abundance of anammox bateria increased to the highest value of 1.58 x 10(7) copies/mu L DNA; Comamon- adaceae was predominant in the UBF at the optimal ratio. Meanwhile, ZSBR was initiated on day 115 as fast nitritation process to satisfy the influent requirement for the UBF. The combined process was started on day 140 and then lasted for 30 d, during the combined process, between the two reactors, the UBF was the main contributor for TN (66.5% +/- 4.5%) and COD (71.8% +/- 4.9%) removal. These results demonstrated that strong SAD occurred in the UBF when following a ZSBR with in-situ NOB elimination. This research presents insights into a novel biological nitrogen removal process for low C/N ratio wastewater treatment. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
期刊：
Journal of Environmental Management,2021年296:113271 ISSN：0301-4797
通讯作者：
Hong Chen
作者机构：
[Du, Chunyan; Yang, Min; Wang, Hong; Chen, Hong; Yang, Enzhe; Yu, Guanlong] Changsha Univ Sci & Technol, Key Lab Water Sediment Sci & Water Disaster Preve, Sch Hydraul Engn, Changsha 410004, Peoples R China.;[Wang, Hong; Chen, Hong] Tohoku Univ, Grad Sch Engn, Dept Civil & Environm Engn, Sendai, Miyagi 9808579, Japan.;[Deng, Zhengyu; He, Weining] China Machinery Int Engn Design & Res Inst Co Ltd, Changsha 410007, Peoples R China.;[Wang, Dongbo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.
通讯机构：
[Hong Chen] K;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410004, China<&wdkj&>Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
关键词：
Anammox;Autotrophic nitrogen removal;Dissolved oxygen;Micro-granules;Partition control
摘要：
Autotrophic nitrogen removal (ANR) processes have not been widely applied in wastewater treatment due to their long start-up time and unstable performance. In this study, a novel dissolved oxygen-differentiated airlift internal circulation reactor was developed to enhance ANR from wastewater. During 200 days of continuous operation, the reactor start-up was achieved within 30 days; a high total nitrogen removal efficiency of 80% was achieved and stably maintained under an aeration rate of 0.90L/min and hydraulic retention time of 6h. Additionally, the color of sludge went from a light yellow to dark red, and the amount and size of the micro-granules increased obviously. Medium-sized (1.0-2.5mm) micro-granules accounted for 72.4% on day 190. The specific anammox activity increased from 0.53 to 1.43g-N/g-VSS/d, while the SNOA decreased from 0.93 to 0.08g-N/g-VSS/d. Furthermore, the microbial analysis showed that the Nitrosomonas (4.2%) and Candidatus Brocadia (22.6%) were enriched and formed the micro-granules after the reactor's long-term operation. The results indicate that novel configuration realizes the partitioning of dissolved oxygen (DO), optimizes nitritation and anammox reactions, and accelerates biochemical reactions, thereby enhancing ANR performance. This study provides a practical alternative to enhance ANR performance and a scientific basis for the development and application of novel nitrogen removal reactors.
关键词：
Metal organic frameworks composite;Gold nanoparticles;Electroreduced carbon dots;One-Pot electrodeposition;Bisphenol A electroanalysis
摘要：
A sensitive electroanalysis of bisphenol A (BPA) based on a novel metal organic frameworks (MOFs) composite of MOFs, gold nanoparticles (AuNPs) and electroreduced carbon dots (ErCDs) was reported. The MOFs composite (AuNPs-ErCDs-MOFs) was in-situ prepared by one-pot electrodeposition approach. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectrometer (FT-IR), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) were used to show the properties of the composite. Interestingly, AuNPs, ErCDs, and AuNPs-ErCDs are found to significantly accelerate electrodeposition of MOFs, and used as good conductive agent to enhance the conductivity of MOFs composite. The electrochemical sensor shows wide linear range from 7.0 x 10(-8) mol/L to 5 x 10(-7) mol/L and 5 x 10(-7) mol/L to 1.3 x 10(-6) mol/L for BPA with a detection limit of 32 nmol/L (S/N = 3). In addition, the proposed sensor was also applied to test the BPA in plastic products with satisfactory recovery.
通讯机构：
[Zhaohong Su] C;College of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, PR China
关键词：
Electro-reduced graphene oxide;Gold nanoparticles;Metal organic frameworks;One-pot electrodeposition;Electroanalysis of rutin
摘要：
Rutin plays an important role in treating human diseases and improving immunity, and it is still necessary to develop an effective method for the detection of rutin. Herein, metal organic frameworks (MOFs) composites consisting of MOFs, electro-reduced graphene oxide (ErGO) and gold nanoparticles (AuNPs) were reported for sensitive electroanalysis of rutin. The MOFs composites were prepared by one-pot electrodeposition. Interestingly, ErGO and/or AuNPs are found to significantly accelerate the electrodeposition of MOFs, and are used as good conducive agent to enhance the conductivity of MOFs composites. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), fourier transform infrared spectrometer (FT-IR), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) were used to characterize the properties of the ErGO-AuNPs-MOFs composites. Kinetic behavior of rutin detection at ErGO-AuNPs-MOFs composites were studied by CV. The proposed sensor shows linear range from 7.0 x 10(-9) to 1.4 x 10(-7) mol/L and 1.4 x 10(-7) to 4.0 x 10(-7) mol/L for rutin with a detection limit of 3.44 nmol/L (S/N = 3). The sensor shows acceptable reproducibility, repeatability, anti-interference ability and stability. The sensor was also used to detect rutin in actual tablets samples with satisfactory recovery.
期刊：
Science of The Total Environment,2021年801:149696 ISSN：0048-9697
通讯作者：
Chunyan Du
作者机构：
[Zhou, Lu; Du, Chunyan; Chen, Hong; Wang, Guoliang; Wu, Haipeng; Zhu, Xiaofang; Chi, Tianying; Yu, Guanlong] Changsha Univ Sci & Technol, Sch Hydraul Engn, Changsha 410114, Peoples R China.;[Zhou, Lu; Du, Chunyan; Chen, Hong; Wu, Haipeng; Yu, Guanlong] Key Lab Water Sediment Sci & Water Disaster Preve, Changsha 410114, Peoples R China.;[Wang, Guoliang; Zhu, Xiaofang; Chi, Tianying] Key Lab Dongting Lake Aquat Ecoenvironm Control &, Changsha 410114, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.
通讯机构：
[Chunyan Du] S;School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, PR China<&wdkj&>Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, PR China
摘要：
Pyrolytic carbon materials (PCMs) with various surface functionalities are widely used as environmentally friendly and cost-efficient adsorbents for the removal of organic and inorganic pollutants. Recent studies have il-lustrated that PCMs as electron shuttles (ESs) could also show excellent performances in promoting the anaero-bic transformation of recalcitrant organic pollutants (ROPs). Numerous studies have demonstrated the excellent electron-shuttle capability (ESC) of PCMs to stimulate the anaerobic reductive transformation of ROPs. However, there isa lack of consistent understanding of the mechanism of ESC formation in PCMs and the stimulation mech-anism for ROPs anaerobic transformation. To gain a more comprehensive understanding of the latest develop-ments in the study of PCMs as ESs for ROPs anaerobic transformation, this review summarizes the formation mechanism, influencing factors, and stimulation mechanisms of ESC. ESC benefits from redox functional groups (quinone and phenol groups), persistent free radicals (PFRs), redox-active metal ions, conductive graphene phase, and porous nature of their surface. The factors influencing ESC include the highest treatment temperature (HTT), feedstocks, modification methods, and environmental conditions, of which, the HTT is the key factor. PCMs promote the reductive transformation of ROPs under anaerobic conditions via abiotic and biotic pathways. Eventually, the prospects for the ROPs anaerobic transformation enhanced by PCMs are proposed. (c) 2021 Elsevier B.V. All rights reserved.
