摘要：
The scientific application of stabilized materials has been considered an effective method for the in situ remediation of Cd-contaminated soil.This study aimed to investigate the persistence of the effect of a combined amendment of limestone and sepiolite (LS) on soil Cd availability and accumulation in rice grown in a mildly Cd-contaminated paddy field (0.45 mg/kg of Cd) over three consecutive rice seasons.1125-4500 kg/ha of LS was applied to the soil before the first rice planting season and 562.5-2250 kg/ha of LS was supplemented before the third rice planting season.The application of LS (1125-4500 kg/ha) increased the soil pH by 0.44-1.09, 0.18-0.53, and 0.42-0.68 in the first, second, and third season, respectively, and decreased the soil acid-extractable Cd content by 18.2-36.4%, 17.7-33.5%, and 9.6-17.6%.LS application significantly decreased the Cd contents in the rice tissues.The application of 4500 kg/ha of LS decreased the Cd content in brown rice to below the National Food Limit Standard of 0.2 mg/kg (GB 2762-2017) in the three consecutive rice seasons.However, the effect of LS on the soil-rice system was significantly weakened in the third season.The supplementary application of 562.5-2250 kg/ha of LS further decreased the Cd content in brown rice by 26.1-56.5% and decreased the health risk index by 23.7-43.8%.Therefore, it was recommended to apply 4500 kg/ha of LS in the first season and to supplement 2250 kg/ha of LS in the third season to effectively guarantee the clean production of rice in three consecutive rice seasons.
期刊：
Journal of Environmental Chemical Engineering,2022年10(3):108071 ISSN：2213-3437
通讯作者：
Ping Wang
作者机构：
[Xu, Haiyin; Zhang, Hongwei; Chen, Yalin; Wang, Ping; Huang, Chao; Yang, Yi] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;Changsha Environmental Protection College, Changsha 410004, China;[Huang, Jing] Hunan Academy of Forestry and State Key Laboratory of Utilization of Woody Oil Resource, Changsha 410004, China;[Luo, Yuanling] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Changsha Environmental Protection College, Changsha 410004, China
通讯机构：
[Ping Wang] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
关键词：
Black locust tree;Cd;Electrokinetic;Enhancing agents;Micro-ecology;Resilience
作者机构：
[Liu, Hao; Cao, Heng; Huang, Chao; Tian, Haoran; Xu, Haiyin; Sun, Chengyou; Zhu, Jian; Wang, Ping] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Huang, Chao] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Peoples R China.;[Yin, Jinglin] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Liu, Zhiming] Eastern New Mex Univ, Dept Biol, Portales, NM 88130 USA.
通讯机构：
[Chao Huang] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Zhiming Liu] A;[Xiaohua Fu] E;Ecological Environment Management and Assessment Center, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Department of Biology, Eastern New Mexico University, Portales, NM 88130, USA
关键词：
water quality prediction;time series;attention mechanism;long short-term memory (LSTM)
摘要：
Prediction of water quality is a critical aspect of water pollution control and prevention. The trend of water quality can be predicted using historical data collected from water quality monitoring and management of water environment. The present study aims to develop a long short-term memory (LSTM) network and its attention-based (AT-LSTM) model to achieve the prediction of water quality in the Burnett River of Australia. The models developed in this study introduced an attention mechanism after feature extraction of water quality data in the section of Burnett River considering the effect of the sequences on the prediction results at different moments to enhance the influence of key features on the prediction results. This study provides one-step-ahead forecasting and multistep forward forecasting of dissolved oxygen (DO) of the Burnett River utilizing LSTM and AT-LSTM models and the comparison of the results. The research outcomes demonstrated that the inclusion of the attention mechanism improves the prediction performance of the LSTM model. Therefore, the AT-LSTM-based water quality forecasting model, developed in this study, demonstrated its stronger capability than the LSTM model for informing the Water Quality Improvement Plan of Queensland, Australia, to accurately predict water quality in the Burnett River.
通讯机构：
[Xiaohua Fu; Rongkui Su] E;Ecological Environment Management and Assessment Center, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
Traditional wastewater treatment technologies have become increasingly inefficient to meet the needs of low-consumption and sustainable wastewater treatment. Researchers are committed to seeking new wastewater treatment technologies, to reduce the pressure on the environment caused by resource shortages. Recently, a microalgal-bacterial granular sludge (MBGS) technology has attracted widespread attention due to its high efficiency wastewater treatment capacity, low energy consumption, low CO2 emissions, potentially high added values, and resource recovery capabilities. This review focused primarily on the following aspects of microalgal-bacterial granular sludge technology: (1) MBGS culture and maintenance operating parameters, (2) MBGS application in different wastewaters, (3) MBGS additional products: biofuels and bioproducts, (4) MBGS energy saving and consumption reduction: greenhouse gas emission reduction, and (5) challenges and prospects. The information in this review will help us better understand the current progress and future direction of the MBGS technology development. It is expected that this review will provide a sound theoretical basis for the practical applications of a MBGS technology in environmentally sustainable wastewater treatment, resource recovery, and system optimization.
作者：
Su, Rongkui;Xie, Tianzhi;Yao, Haisong;Chen, Yonghua;Wang, Hanqing;...
期刊：
International Journal of Environmental Research and Public Health,2022年19(22):14968- ISSN：1661-7827
通讯作者：
Yiting Luo<&wdkj&>Yonghua Chen
作者机构：
[Xie, Tianzhi; Su, Rongkui; Yao, Haisong; Chen, Yonghua] Cent South Univ Forestry & Technol, Sch Environm Sci & Engn, Changsha 410004, Peoples R China.;[Dai, Xiangrong; Su, Rongkui] PowerChina Zhongnan Engn Corp Ltd, Changsha 410004, Peoples R China.;[Wang, Hanqing] Cent South Forestry Univ, Sch Civil Engn, Changsha 410018, Peoples R China.;[Wang, Hanqing] Hunan Engn Res Ctr Full Life Cycle Energy Efficie, Changsha 410018, Peoples R China.;[Wang, Yangyang] Henan Univ, Coll Geog & Environm Sci, Kaifeng 475004, Peoples R China.
通讯机构：
[Yiting Luo; Yonghua Chen] A;Authors to whom correspondence should be addressed.<&wdkj&>Business College, Hunan First Normal University, Changsha 410205, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
Phytoremediation could be an alternative strategy for lead (Pb) contamination. K. paniculata has been reported as a newly potential plant for sustainable phytoremediation of Pb-contaminated soil. Physiological indexes, enrichment accumulation characteristics, Pb subcellular distribution and microstructure of K. paniculata were carefully studied at different levels of Pb stress (0-1200 mg/L). The results showed that plant growth increased up to 123.8% and 112.7%, relative to the control group when Pb stress was 200 mg/L and 400 mg/L, respectively. However, the average height and biomass of K. paniculata decrease when the Pb stress continues to increase. In all treatment groups, the accumulation of Pb in plant organs showed a trend of root > stem > leaf, and Pb accumulation reached 81.31%similar to 86.69% in the root. Chlorophyll content and chlorophyll a/b showed a rising trend and then fell with increasing Pb stress. Catalase (CAT) and peroxidase (POD) activity showed a positive trend followed by a negative decline, while superoxide dismutase (SOD) activity significantly increased with increasing levels of Pb exposure stress. Transmission electron microscopy (TEM) showed that Pb accumulates in the inactive metabolic regions (cell walls and vesicles) in roots and stems, which may be the main mechanism for plants to reduce Pb biotoxicity. Fourier transform infrared spectroscopy (FTIR) showed that Pb stress increased the content of intracellular -OH and -COOH functional groups. Through organic acids, polysaccharides, proteins and other compounds bound to Pb, the adaptation and tolerance of K. paniculata to Pb were enhanced. K. paniculata showed good phytoremediation potential and has broad application prospects for heavy metal-contaminated soil.
作者机构：
[Qiu, Yin-Yan; Liao, Bo-Han; Tan, Wen-Tao; Zeng, Peng; Huo, Yang; Zhou, Hang; Gu, Jiao-Feng] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Liao, Bo-Han; Zeng, Peng; Zhou, Hang; Gu, Jiao-Feng] Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China
摘要：
Phosphorus (P) is an essential nutrient element for crop growth. The effects of P surplus or deficit on Cd absorption and transport in rice in Cd-polluted farmland is not clear. The effects of P deficiency and P sufficiency on Cd uptake, transport, and accumulation in rice under Cd stress were investigated by applying different levels of phosphorus (NaH(2)PO(4)) in a hydroponic experiment. The results showed that:① with the increase in ρ(P) (1.5-48.0 mg·L(-1)), the biomass in all parts of the rice plants had no obvious change, and the contents of photosynthetic pigment (chlorophyll a, chlorophyll b, and carotenoid) firstly ascended and then descended; high concentrations of P inhibited the synthesis of photosynthetic pigments. ② Under Cd stress, when the P was deficient (1.5-6.0 mg·L(-1)) or sufficient (12.0-48.0 mg·L(-1)), the Cd content in different parts of the rice increased with the increase in P addition level, and the maximum increase in Cd content in brown rice was 132.1% and 191.2%, respectively. ③ The P/Cd of brown rice showed a piecewise decreasing rule under P deficiency and P sufficiency, and the Cd content in brown rice was significantly negatively correlated with P/Cd (P<0.01). These results indicated that elevating phosphorus concentration when rice was under both the conditions of P deficiency and P sufficiency could promote the uptake and transport of Cd by rice roots under Cd stress, thus increasing the accumulation of Cd in aboveground parts and the risk of excessive Cd in rice.
摘要：
The cultivation methods determine the production and remediation capacity of crops in heavy metal contaminated farmland. This study investigated the effects of seedling establishment methods and relay inter cropping with Chinese milk vetch (Astragalus sinicus L., CMV) on the production and remediation of Napier grass (Pennisetum purpureum Schum, NG) in cadmium (Cd)-contaminated farmland in southern China. The results showed that the regrow NG (RNG) had higher aerial part yield because of its well-developed roots and larger tiller numbers, which increased the Cd uptake. CMV mulching promoted the stubble seedling's growth by increasing the soil temperature during the overwintering period. The CMV return to field increased the soil dissolved organic carbon (DOC), enhanced the bioavailability of Cd in soil, and promoted the Cd uptake of NG. The CMV application also alleviated the total nitrogen decline of soil. The CMV-RNG relay intercropping system (CMV-RNG) produced larger aerial part yield and Cd uptake, mowing NG once (in December), reaching 60.60 t ha(-1) (DW) and 29.09 g ha(-1), respectively, and August was the suitable month to mow for higher yield and Cd uptake. Meanwhile, the Cd concentration in NG aerial parts was relatively low (0.16-0.59 mg kg(-1)), making it safe to be used as fodder. Thus, the CMV-RNG system is a cleaner production strategy in Cd-contaminated farmland.
期刊：
Separation and Purification Technology,2022年303:122237 ISSN：1383-5866
通讯作者：
Xiancheng Ma<&wdkj&>Qingding Wu<&wdkj&>Liqing Li
作者机构：
[Wu, Yi; Wu, Qingding; Ma, Xiancheng] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Liqing; Zeng, Zheng; Guo, Yang] Cent South Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Su, Rongkui] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Yao, Xiaolong] Beijing Technol & Business Univ, Dept Environm Sci & Engn, 11 Fuchenglu, Beijing 100048, Peoples R China.;[Wang, Shaobin] Univ Adelaide, Sch Chem Engn & Adv Mat, 108 King William St, Adelaide, SA 5005, Australia.
通讯机构：
[Xiancheng Ma; Qingding Wu] C;[Liqing Li] S;College of Mechanical & Electrical Engineering, Central South University of Forestry and Technology, Changsha 410083, Hunan, China<&wdkj&>School of Energy Science and Engineering, Central South University, Changsha 410083, Hunan, China
关键词：
Porous carbon;Pore structure;Nitrogen and oxygen groups;Iodine capture
摘要：
The removal of radioactive iodine species during nuclear accidents and nuclear fuel reprocessing is crucial to nuclear safety, public health and environmental protection. Here, a series of nitrogen-doped porous carbon derived from benzimidazole (NBCs) with well-developed pore structure were prepared. During KOH activation, the potassium salt formed at 600-700 degrees C is mainly K2CO3 and K2O, and the pore size obtained is mainly microporous. With the temperature increases, the K2CO3 and K2O are converted to KOCN, which generates mesopores. NBCs were subsequently tested for gaseous iodine and solution iodine. The results show that NBC800-2 exhibits the highest iodine vapor adsorption capacity (7873 mg/g) at 75 celcius. Theoretical calculations and experimental data show that the iodine adsorption of NBCs for iodine vapor is mainly determined by pore structure, especially micropores and narrow mesoporous. The effect of nitrogen and oxygen doping on the adsorption capacity of gaseous iodine is limited. In the cyclohexane solution, the adsorption capacity of NBCs for iodine is mainly determined by micropores. In KI/H2O solution, the iodine adsorption mainly depends on mi-cropores and narrow mesopores, which is completely different from the result of iodine adsorption in cyclo-hexane. This is mainly due to the fact that I3- has a larger diameter than I2, and the adsorption energy of I3- (82.8 kJ/mol) on the carbon surface is higher than that of I2 (58.1 kJ /mol). Moreover, Langmuir model can better describe the adsorption process of iodine in cyclohexane and KI/H2O solution than Freundlich model, which proves that the process is mainly monolayer formation. This study provides insights for the further design and development of adsorbents for iodine capture from nuclear waste and nuclear accidents.
摘要：
In this work, Ag/WO3/g-C3N4 (AWC) nanocomposites were successfully prepared via a hydrothermal method. Oxytetracycline hydrochloride (OTC) was used to evaluate the photocatalytic activity of the photocatalysts under visible light. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra (Raman), scanning electron microscope (SEM), Ultraviolet-visible spectroscopy (UV-vis DRS), photocurrent density (I-t) and electrochemical impedance spectra (EIS). The results showed that WO3 and Ag nanoparticles were coupled with g-C3N4 successfully. Comparing with pure WO3 or g-C3N4, the visible light absorption region of AWC composites was effectively broadened. The photocatalytic performance experiment illustrated that AWC-2 composite had the highest photocatalytic activity, and 97.74% of OTC (10 mg/L) was degraded in 60 min with 0.4 g/L of AWC-2. The radical scavenging experiments indicated that the superoxide radical (center dot O-2(-)) and hydroxyl radical (center dot OH) were the most important active species for OTC oxidation. The five cycle photocatalysis experiment further proved that AWC is a stable photocatalyst for degradation of OTC. Finally, the possible degradation mechanism of Z-scheme heterostructure photocatalysis was proposed according to the experimental results.
关键词：
Co-doped boron and cobalt;Electro-Fenton;Flow-through;Pesticide;TiO2 nanotubes
摘要：
A flow-through system was constructed for 2,4-dichlorophenoxyacetic acid (2,4-D) degradation for the first time using efficient boron and cobalt co-doped TiO2 nanotubes (B, Co-TNT) as the anode and carbon black doped carbon felt (CB-CF) that had a high H2O2 yield as the cathode. Compared with dimensionally stable anode (DSA), whether in anodic oxidation (AO) or AO-electro-Fenton (EF) system, 2,4-D degradation in B, Co-TNT anode system was more efficient accompanying with a lower energy consumption (Ec). Different operating parameters including applied current density, initial pH and flow rate were explored, supporting that the optimal Fe2+ dosage was 0.5 mM while decreasing the initial pH and increasing the current intensity and flow rate were beneficial to 2,4-D removal. In this AO-EF system, the involved mechanisms for 2,4-D degradation were anodization and Fenton oxidation, possessing the comprehensive effect of center dot OH and SO4 center dot- with their contribution of 92.7% and 4.8%, respectively. This flow-through AO-EF system performed a stable performance, and an efficient degradation performance with low Ec (5.8-29.5 kWh (kg TOC)-1) was obtained for different kinds of contaminants (methylene blue, phenol, p-nitrophenol and sulfamethazine). Therefore, B, Co-TNT anode coupled with CB-CF cathode in flow-through system was effective for contaminants degradation.
通讯机构：
[Ge, TD ; Chen, JP] N;Ningbo Univ, Inst Plant Virol, State Key Lab Managing Biot & Chem Threats Qual &, Ningbo 315211, Peoples R China.
关键词：
Environmental filtering;Fungal community assembly;Microbial community assembly;Microbial interactions;Soil-borne disease;Soil-plant continuum
摘要：
Understanding the mechanisms that govern microbial community assembly across soil-plant continuum is crucial for predicting the response of ecosystems to environmental changes. However, the impact of the health status of plant on microbial assembly across this continuum still remain poorly understood. Here, we investigated how wheat yellow mosaic (WYM), caused by the wheat mosaic virus transmitted by Polymyxa graminis, affected microbial assembly across soil (bulk soil, rhizosphere soil), and plant (roots and leaves) continuum in a winter wheat (Triticum aestivum L.) system in northern China, using null model analysis. The results showed that deterministic processes dominated the bacterial community assembly, whereas stochastic processes were primarily responsible for the assembly of the fungal communities. With increasing levels of WYM, deterministic processes were greatly enhanced for bacterial community assembly, accompanied by a decrease in community niche breadth. Intensified competition between bacteria and fungi and increased soil total nitrogen (TN) and soil organic carbon (SOC) contents were mainly responsible for the enhanced deterministic processes for bacterial community assembly. Random forest modeling indicated a strong potential of rhizosphere bacterial community assembly for predicting the pathological conditions of wheat. Structural equation modeling showed that disease level was positively correlated with SOC and TN contents, competitions between bacteria and fungi, and the contribution of variable selection processes to the bacterial community assembly in the wheat rhizosphere. Our study revealed the ecological mechanisms underlying the associations between microbial communities and soil-borne disease, and highlighted the significance of microbial community assembly for maintaining soil and plant health. (c) 2021 Elsevier B.V. All rights reserved.
