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| 1 | Phosphogypsum stabilization of bauxite residue:Conversion of its alkaline characteristics显示文摘Reduction of the high alkalinity of bauxite residue is a key problem to solve to make it suitable for plant growth and comprehensive utilization. In this study, phosphogypsum, a waste product from the phosphate fertilizer industry, was used to drive the alkaline transformation of the bauxite residue. Under optimal water washing conditions(liquid/solid ratio of 2 mL/g, 30°C, 24 hr), the impact of quantity added, reaction time and reaction mechanism during phosphogypsum application were investigated. Phosphogypsum addition effectively lowered p H levels and reduced the soluble alkalinity by 92.2%. It was found that the concentration of soluble Na and Ca ions in the supernatant increased gradually, whilst the exchangeable Na+and Ca^(2+)in solid phase changed 112 mg/kg and 259 mg/kg, respectively. Ca^(2+)became the dominant element in the solid phase(phosphogypsum addition of 2%, liquid/solid ratio of 2 mL/g, 30°C, 12 hr). X-ray diffraction data indicated that cancrinite and hydrogarnet were the primary alkaline minerals. SEM images suggested that phosphogypsum could promote the formation of stable macroaggregates, whilst the content of Ca^(2+)increased from 5.6% to 18.2% and Na reduced from 6.8% to 2.4%. Treatment with phosphogypsum could significantly promote the transformation of alkalinity cations by neutralization, precipitation and replacement reactions.This research provided a feasible method to promote soil formation of bauxite residue by phosphogypsum amendment. | Shengguo Xue Meng Li Jun Jiang Graeme J.Millar Chuxuan Li Xiangfeng Kong | 2019 | Journal of Environmental Sciences2019，31，3： | 35 |
| 2 | Changes in distribution and microstructure of bauxite residue aggregates following amendments addition显示文摘Bauxite residue is a highly alkaline byproduct which is routinely discarded at residue disposal areas. Improving soil formation process to revegetate the special degraded lands is a promising strategy for sustainable management of the refining industry. A laboratory incubation experiment was used to evaluate the effects of gypsum and vermicompost on stable aggregate formation of bauxite residue. Aggregate size distribution was quantified by fractal theory, whilst residue microstructure was determined by scanning electron microscopy and synchrotron-based X-ray micro-computed tomography. Amendments addition increased the content of macro-aggregates(> 250 μm) and enhanced aggregate stability of bauxite residue. Following gypsum and vermicompost addition, fractal dimension decreased from 2.84 to 2.77, which indicated a more homogeneous distribution of aggregate particles. Images from scanning electron microscopy and three-dimensional microstructure demonstrated that amendments stimulate the formation of improved structure in residue aggregates. Pore parameters including porosity, pore throat surface area, path length, and path tortuosity increased under amendment additions. Changes in aggregate size distribution and microstructure of bauxite residue indicated that additions of gypsum and vermicompost were beneficial to physical condition of bauxite residue which may enhance the ease of vegetation. | Shengguo Xue Yuzhen Ye Feng Zhu Qiongli Wang Jun Jiang William Hartley | 2019 | Journal of Environmental Sciences2019，31，4： | 21 |
| 3 | Arsenic dynamics in the rhizosphere and its sequestration on rice roots as affected by root oxidation显示文摘A pot experiment was conducted to investigate the effects of root oxidation on arsenic(As) dynamics in the rhizosphere and As sequestration on rice roots. There were significant differences(P < 0.05) in pH values between rhizosphere and non-rhizosphere soils, with pH 5.68–6.16 in the rhizosphere and 6.30–6.37 in non-rhizosphere soils as well as differences in redox potentials(P < 0.05). Percentage arsenite was lower(4%–16%) in rhizosphere soil solutions from rice genotypes with higher radial oxygen loss(ROL) compared with genotypes with lower ROL(P < 0.05). Arsenic concentrations in iron plaque and rice straw were significantly negatively correlated(R =-0.60, P < 0.05). Genotypes with higher ROL(TD71 and Yinjingruanzhan) had significantly(P < 0.001) lower total As in rice grains(1.35 and 0.96 mg/kg, respectively) compared with genotypes with lower ROL(IAPAR9, 1.68 mg/kg; Nanyangzhan 2.24 mg/kg) in the As treatment, as well as lower inorganic As(P < 0.05). The present study showed that genotypes with higher ROL could oxidize more arsenite in rhizosphere soils, and induce more Fe plaque formation, which subsequently sequestered more As. This reduced As uptake in aboveground plant tissues and also reduced inorganic As accumulation in rice grains. The study has contributed to further understanding the mechanisms whereby ROL influences As uptake and accumulation in rice. | Weisong Pan Chuan Wu Shengguo Xue William Hartley | 2014 | Journal of Environmental Sciences2014，26，4： | 17 |
| 4 | Soil heavy metal pollution from Pb/Zn smelting regions in China and the remediation potential of biomineralization显示文摘Smelting activities pose serious environmental problems due to the local and regional heavy metal pollution in soils they cause. It is therefore important to understand the pollution situation and its source in the contaminated soils. In this paper, data on heavy metal pollution in soils resulting from Pb/Zn smelting(published in the last 10 years) in China was summarized. The heavy metal pollution was analyzed from a macroscopic point of view. The results indicated that Pb, Zn, As and Cd were common contaminants that were present in soils with extremely high concentrations. Because of the extreme carcinogenicity, genotoxicity and neurotoxicity that heavy metals pose, remediation of the soils contaminated by smelting is urgently required. The primary anthropogenic activities contributing to soil pollution in smelting areas and the progressive development of accurate source identification were performed. Due to the advantages of biominerals, the potential of biomineralization for heavy metal contaminated soils was introduced. Furthermore, the prospects of geochemical fraction analysis, combined source identification methods as well as several optimization methods for biomineralization are presented, to provide a reference for pollution investigation and remediation in smelting contaminated soils in the future. | Xinghua Luo Chuan Wu Yongcheng Lin Waichin Li Min Deng Jingqiang Tan Shengguo Xue | 2023 | Journal of Environmental Sciences2023，，3： | 5 |
| 5 | Effect of amendments on the leaching behavior of alkaline anions and metal ions in bauxite residue显示文摘A column leaching experiment was used to investigate the efficacy of amendments on their ability to remove alkaline anions and metal ions from bauxite residue leachates.Treatments included,simulated acid rain (AR),phosphogypsum + vermicompost (PVC),phosphogypsum + vermicompost + simulated acid rain (PVA),and biosolids + microorganisms (BSM) together with controls (CK).Results indicated that amendment could effectively reduce the leachate pH and EC values,neutralize OH-,CO32-,HCO3-,and water soluble alkali,and suppress arsenic (As) content.Correlation analysis revealed significant linear correlations with pH and concentrations of OH-,CO32-,HCO3-,water-soluble alkali,and metal ions.BSM treatment showed optimum results with neutralizing anions (OH-,CO32-,and HCO3-),water soluble alkali,and removal of metal ions (Al,As,B,Mo,V,and Na),which was attributed to neutralization from the generation of small molecular organic acids and organic matter during microbial metabolism.BSM treatment reduced alkaline anions and metal ions based on neutralization reactions in bauxite residue leachate,which reduced the potential pollution effects from leachates on the soil surrounding bauxite residue disposal areas. | Tao Tian Jinaju Zhou Feng Zhu Yuzhen Ye Ying Guo William Hartley Shengguo Xue | 2019 | Journal of Environmental Sciences2019，31，11： | 5 |
| 6 | A practical method for identifying key factors in the distribution and formation of heavy metal pollution at a smelting site显示文摘Smelting activities are the main pathway for the anthropogenic release of heavy metals(HMs)into the soil-groundwater environment.It is vital to identify the factors affecting HMs pollution to better prevent and manage soil pollution.The present study conducted a comprehensive investigation of HMs in soil from a large abandoned Zn smelting site.An integrated approach was proposed to classify and quantify the factors affecting HMs pollution in the site.Besides,the quantitative relationship between hydrogeological characteristics,pollution transmission pathways,smelting activities and HMs pollutionwas established.Results showed that the soils were highly contaminated by HMs with a pollution index trend of As>Zn>Cd>Pb>Hg.In identifying the pollution hotspots,we conclude that the pollution hotspots of Pb,As,Cd,and Hg present a concentrated distribution pattern.Geo-detector method results showed that the dominant driving factors for HMs distribution and accumulation were the potential pollution source and soil permeability.Additionally,the main drivers are variable for different HMs,and the interaction among factors also enhanced soil HMs contamination.Our analysis illustrates how the confounding influences from complex environmental factors can be distilled to identify key factors in pollution formation to guide future remediation strategies. | Jiaqing Zeng Wenshun Ke Min Deng Jingqiang Tan Chuxuan Li Yizhi Cheng Shengguo Xue | 2023 | Journal of Environmental Sciences2023，，5： | 3 |
| 7 | Improvements on physical conditions of bauxite residue following application of organic materials显示文摘Soil formation and ecological rehabilitation is the most promising strategy to eliminate environmental risks of bauxite residue disposal areas. Its poor physical structure is nevertheless a major limitation to plant growth. Organic materials were demonstrated as effective ameliorants to improve the physical conditions of bauxite residue. In this study, three different organic materials including straw(5% W/W), humic acid(5% W/W), and humic acidacrylamide polymer(0.2% and 0.4%, W/W) were selected to evaluate their effects on physical conditions of bauxite residue pretreated by phosphogypsum following a 120-day incubation experiment. The proportion of 2-1 mm macro-aggregates, mean weight diameter(MWD) and geometric mean diameter(GWD) increased following organic materials addition, which indicated that organic materials could enhance aggregate stability. Compared with straw, and humic acid, humic acid-acrylamide polymer application had improved effects on the formation of water-stable aggregates in the residues. Furthermore, organic materials increased the total porosity, total pore volume and average pore diameter, and reduced the micropore content according to nitrogen gas adsorption(NA) and mercury intrusion porosimetry(MIP)analysis, whilst enhancing water retention of the residues based on water characteristic curves. Compared with traditional organic wastes, humic acid-acrylamide polymer could be regarded as a candidate according to the comprehensive consideration of the additive amount and the effects on physical conditions of bauxite residue. These findings could provide a novel application to both Ca-contained acid solid waste and high-molecular polymers on ecological rehabilitation at disposal areas. | Ying Guo Yuzhen Ye Feng Zhu Rui Xue Xianchao Zhang Mingxing Zhu William Hartley Lin Guo Shengguo Xue | 2022 | Journal of Environmental Sciences2022，34，6： | 2 |
| 8 | Variation on leaching behavior of caustic compounds in bauxite residue during dealkalization process显示文摘Bauxite residue,a byproduct of alumina manufacture,is a serious environmental pollutant due to its high leaching contents of metals and caustic compounds.Four typical anions of CO3^2-,HCO3^-,Al(OH)4^- and OH-(represented caustic compounds) and metal ions(As,B,Mo and V) were selected to assess their leaching behavior under dealkalization process with different conditions including liquid/solid ratio(L/S ratio),temperature and leaching time.The results revealed that washing process could remove the soluble composition in bauxite residue effectively.The leaching concentrations of typical anions in bauxite residue decreased as follows:c(CO3^2-)> c(HCO3^-)> c[Al(OH)4-]> c(OH-).L/S ratio had a more significant effect on leaching behavior of OH-,whilst the leaching concentration of Al(OH)4-varied larger underleaching temperature and time treatment.Under the optimal leaching,the total alkaline,soluble Na concentrations,exchangeable Ca concentrations were 79.52,68.93,and 136.0 mmol/L,respectively,whilst the soluble and exchangeable content of As,B,Mo and V in bauxite residue changed slightly.However,it should be noted that water leaching has released metal ions such as As,B,Mo and V in bauxite residue to the surrounding environment.The semiquantitative analysis of XRD revealed that water leaching increased the content of gismondine from 2.4% to 6.4%.The SEM images demonstrated the dissolution of caustic compounds on bauxite residue surface.The correlation analysis indicated that CO3^2- and HCO3^- could effectively reflect the alkalinity of bauxite residue,and may be regarded as critical de alkalization indicators to evaluate alkalinity removal in bauxite residue. | Yujun Wu Meng Li Feng Zhu William Hartley Jiaxin Liao Wenhui An Shengguo Xue Jun Jiang | 2020 | Journal of Environmental Sciences2020，32，6： | 2 |
| 9 | Spatial distribution, environmental risks, and sources of potentially toxic elements in soils from a typical abandoned antimony smelting site显示文摘The rapid development of the smelting industry increases the release of antimony(Sb)into the soil environment,which threatens human health and ecosystems.A total of 87 samples were collected from an abandoned Sb smelting site to evaluate pollution characteristics and environmental risks of the potentially toxic elements(PTEs).The contents of As,Cu,Ni,Pb,Sb,and Zn in the fresh soils determined by P-XRF were 131,120,60,145,240,and 154 mg/kg,respectively,whilst following drying,grinding,and sieving pretreatments,the corresponding contents increased to 367,179,145,295,479,and 276 mg/kg,respectively.There was a significant correlation between the data obtained by P-XRF and ICP-OES in the treated samples,which showed the application feasibility of P-XRF.The average contents of Sb and As were 440.6 and 411.6 mg/kg,respectively,which exceeded the control values of the development land in GB 36600-2018.The ecological risk levels of the six PTEs decreased in the following order:As>Sb>Pb>Zn>Ni>Cu.Non-carcinogenic risk revealed that As,Pb,and Sb posed health risks for children,whilst for carcinogenic risk,the risk values for As and Ni were higher than the limit values for both children and adults.Anthropogenic sources accounted for more than 70.0%of As,Pb,and Sb concentrations in soils,indicating a significant influence on PTEs accumulation.The findings provide a basis for quick determination of the contamination characteristics and risk control of PTEs at Sb smelting sites. | Shengguo Xue Ramon Korna Jiarong Fan Wenshun Ke Wei Lou Jinting Wang Feng Zhu | 2023 | Journal of Environmental Sciences2023，，5： | 2 |
| 10 | A multi-residue method for the determination of 124 pesticides in rice by modified QuEChERS extraction and gas chromatography–tandem mass spectrometry显示文摘 | Xue Hou Mei Han XiaoHang Dai XiaoFeng Yang Shengguo Yi | 2013 | 2013 (2-3)2013，，2： | 1 |
| 11 | A multi-residue method for the determination of 124 pesticides in rice by modified QuEChERS extraction and gas chromatography–tandem mass spectrometry显示文摘 | Xue Hou Mei Han XiaoHang Dai XiaoFeng Yang Shengguo Yi | 2013 | Food Chemistry (-)2013，，2： | 1 |
| 12 | Rhodium(Ⅱ)-Catalyzed [4+3] Cyclization of Triazoles with Indole Derivatives and Its Application in the Total Synthesis of (±)-Aurantioclavine显示文摘An efficient rhodium(Ⅱ)-catalyzed[4+3]cyclization reaction of 1-sulfonyl-1,2-3-triazoles and indoles was developed.Azepino[5,4,3-ccflindoles,which are widely distributed in ergot alkaloids with various biological activities,could be obtained in good to excellent yields.In addition,the total synthesis of(±)-aurantioclavine was completed in four steps from the known compound 1a adopting this[4+3]cyclization as a key step. | Shengguo Duan Bing Xue Hui Meng Zihang Ye Ze-Feng Xu Chuan-Ying Li | 2021 | Chinese Journal of Chemistry2021，39，5： | 1 |
| 13 | A multi-residue method for the determination of 124 pesticides in rice by modified QuEChERS extraction and gas chromatography–tandem mass spectrometry显示文摘 | Xue Hou Mei Han XiaoHang Dai XiaoFeng Yang Shengguo Yi | 2013 | Food Chemistry (-)2013，，2： | 1 |
| 14 | The dynamic development of bacterial community following long-term weathering of bauxite residue显示文摘Bauxite residue is the industrial waste generated from alumina production and commonly deposited in impoundments.These sites are bare of vegetation due to the extreme high salinity and alkalinity,as well as lack of nutrients.However,long term weathering processes could improve residue properties to support the plant establishment.Here we investigate the development of bacterial communities and the geochemical drivers in bauxite residue,using Illumina high-throughput sequencing technology.Long term weathering reduced the pH in bauxite residue and increased its nutrients content.The bacterial community also significantly developed during long term weathering processes.Taxonomic analysis revealed that natural weathering processes encouraged the populations of Proteobacteria,Chloroflexi,Acidobacteria and Planctomycetes,whereas reducing the populations of Firmicutes and Actinobacteria.Redundancy analysis(RDA)indicated that total organic carbon(TOC)was the dominant factors affecting microbial structure.The results have demonstrated that natural weathering processes improved the soil development on the abandoned bauxite residue disposal areas,which also increased our understanding of the correlation between microbial variation and residue properties during natural weathering processes in Bauxite residue disposal areas. | Hao Wu Li Chen Feng Zhu William Hartley Yifan Zhang Shengguo Xue | 2020 | Journal of Environmental Sciences2020，32，4： | 1 |
| 15 | Remediation of arsenic-contaminated paddy field by a new iron oxidizing strain(Ochrobactrum sp.)and iron-modified biochar显示文摘Iron-oxidizing strain(FeOB)and iron modified biochars have been shown arsenic(As)reme-diation ability in the environment.However,due to the complicated soil environment,few field experiment has been conducted.The study was conducted to investigate the potential of iron modified biochar(BC-FeOS)and biomineralization by a new found FeOB to remediate As-contaminated paddy field.Compared with the control,the As contents of G_(B)(BC-FeOS),G_(F)(FeOB),G_(FN)(FeOB and nitrogen fertilizer),G_(BF)(BC-FeOS and FeOB)and G_(BFN)(BC-FeOS,FeOB and nitrogen fertilizer)treatments in pore water decreased by 36.53%-80.03%and the microbial richness of iron-oxidizing bacteria in these treatments increased in soils at the rice maturation stage.The concentrations of available As of G_(B),G_(F),G_(FN),G_(BF) and G_(BFN) at the tillering stage were significantly decreased by 10.78%-55.48%.The concentrations of non-specifically absorbed and specifically absorbed As fractions of G_(B),G_(F),G_(FN),G_(BF) and G_(BFN) in soils were decreased and the amorphous and poorly crystalline hydrated Fe and Al oxidebound fraction was increased.Moreover,the As contents of G_(B),G_(F),G_(FN),G_(BF) and G_(BFN) in rice grains were significantly decreased(*P<0.05)and the total As contents of G_(FN),G_(BF) and G_(BFN) were lower than the standard limit of the National Standard for Food Safety(GB 2762-2017).Compared with the other treatments,G_(BFN) showed the greatest potential for the effective remediation of As-contaminated paddy fields. | Kaikai Wu Chuan Wu Xingxing Jiang Rui Xue Weisong Pan Wai-Chin Li Xinghua Luo Shengguo Xue | 2022 | Journal of Environmental Sciences2022，34，5： | 1 |
| 16 | Alkalinity neutralization and structure upgrade of bauxite residue waste via synergistic pyrolysis with biomass显示文摘Bauxite residues,a large volume solid waste,are in urgent need of effective disposal and management.Especially,strategies to alleviate the high alkalinity of bauxite residue remain a big challenge.Here,we developed a synergistic pyrolysis to neutralize the alkalinity of bauxite residue and upgrade the structure of biomass simultaneously.By cooperating the catalytic feature from bauxite residue,rice straw,a cellulose-enriched biomass,could prefer to produce acidic components under a hypothermal pyrolysis temperature(below 250℃)and partial oxygen-contained atmosphere as evidenced by the synchronous TGA-FTIR analysis.In return,these in-situ produced acidic components neutralized the bauxite residue profoundly(pH decreased from 11.5 to 7.2)to obtain a neutral product with long-term water leaching stability.Also,a higher pyrolysis temperature led to neutral biochar-based products with well-defined carbonization characteristics.Thus,the biomass-driven pyrolysis strategy provides a potential to dispose the alkalinity issue of bauxite residue and further opportunities for the sustainable reuse and continuing management of bauxite residue. | Chuxuan Li Lu Tang Jun Jiang Feng Zhu Jingju Zhou Shengguo Xue | 2020 | Journal of Environmental Sciences2020，32，7： | 1 |
| 17 | Accelerated alkalinity regulation and long-term dry-wet aging durability for bauxite residue remediated with biomass pyrolysis显示文摘Biomass fermentation provides a potential route toward the ecological disposal for the bauxite residue(BR)with high alkalinity issues.However,how to accelerate the remediation of the alkaline problem with a long-term durability is still a big challenge.Herein,we investigated the acceleration of the decomposition of straw toward organic acid species via a pyrolysis strategy as well as the pH stability during long-term dry-wet aging for the treated BR.The pH of pyrolytic BR at 300℃ is stabilized at around 8.90 after 70 days’dry-wet aging.During the aging,the main Ca-contained alkaline minerals of calcite and cancrinite are dissolved and the content of exchangeable Na+is reduced.This pyrolysis process can decompose straw quickly and produce more organic matters that are easily degraded to fulvic and humic acid as evidenced by 3D fluorescence spectrum analysis.Compared to the fermentation with straw under natural conditions,the alkalinity regulation of BR after pyrolysis is featured with shorter period and lower pH as well as long-term pH stability.Therefore,the synergistic pyrolysis of BR with straw provides an alternative method to address the alkaline issues,which is conducive to promoting the soil formation of BR. | Zhexiang He Jingju Zhou Jianwei Tang Chuxuan Li Jun Jiang Wei Chen Feng Zhu Shengguo Xue | 2022 | Journal of Environmental Sciences2022，34，1： | 0 |
| 18 | Rapid conversion of alkaline bauxite residue through co-pyrolysis with waste biomass and its revegetation potential显示文摘The extreme alkalinity of bauxite residue(BR)leads to difficulty with its reuse.Alkaline leachate and dust generation during the stacking process can pollute surrounding soil,air and water.In this work,co-pyrolysis of bauxite residue and sawdust was applied to rapidly produce a soil-like matrix that met the conditions for plant growth as demonstrated by ryegrass pot experiments.The present study aimed to characterize the detailed changes in physicochemical,mineral weathering,and microbial communities of the pyrolyzed BR with different ratios of saw dust after plant colonization for 2 months.With increasing sawdust addition during co-pyrolysis,the pH of BR decreased from 11.21 to 8.16,the fraction of macro-aggregates 0.25-2 mm in the water-stable agglomerates increased by 29.3%,and the organic carbon concentration increased from 12.5 to 320 mg/kg,whilst facilitating the degree of humification,which were all beneficial to its revegetation performance.The backscattered electron-scanning electron microscope-energy-dispersive X-ray spectrometry(BSE-SEM-EDS)results confirmed the occurrence of sodalite and calcite weathering on aggregate surfaces,and X-ray photoelectron spectroscopy(XPS)results of surface Al and Si compounds identified that some weathering products were clay minerals such as kaolinite.Furthermore,bacterial community composition and structure shifted towards typical soil taxonomic groups.These results demonstrate soil development of treated BR at an early stage.The technique is a combination of alkalinity regulation and agglomerate construction,which accelerates soil formation of BR,thus proving highly promising for potential application as an artificial soil substitute. | Yujun Wu Yufei Zhang Qihou Li Jun Jiang Yifan Jiang Shengguo Xue | 2023 | Journal of Environmental Sciences2023，，5： | 0 |
| 19 | The effect of extracellular polymeric substances (EPS) of iron-oxidizing bacteria (Ochrobactrum EEELCW01) on mineral transformation and arsenic (As) fate显示文摘Extracellular polymeric substances(EPS)are an importantmedium for communication and material exchange between iron-oxidizing bacteria and the external environment and could induce the iron(oxyhydr)oxides production which reduced arsenic(As)availability.The main component of EPS secreted by iron-oxidizing bacteria(Ochrobactrum EEELCW01)was composed of polysaccharides(150.76-165.33 mg/g DW)followed by considerably smaller amounts of proteins(12.98–16.12 mg/g DW).Low concentrations of As(100 or 500μmol/L)promoted the amount of EPS secretion.FTIR results showed that EPS was composed of polysaccharides,proteins,and a miniscule amount of nucleic acids.The functional groups including-COOH,-OH,-NH,-C=O,and-C-O played an important role in the adsorption of As.XPS results showed that As was bound to EPS in the form of As3+.With increasing As concentration,the proportion of As3+adsorbed on EPS increased.Ferrihydrite with a weak crystalline state was only produced in the system at 6 hr during the mineralization process of Ochrobactrum sp.At day 8,the minerals were composed of goethite,galena,and siderite.With the increasing mineralization time,the main mineral phases were transformed from weakly crystalline hydrous iron ore into higher crystallinity siderite(FeCO_(3))or goethite(α-FeOOH),and the specific surface area and active sites of minerals were reduced.It can be seen from the distribution of As elements that As is preferentially adsorbed on the edges of iron minerals.This study is potential to understand the biomineralizationmechanism of iron-oxidizing bacteria and As remediation in the environment. | Chuan Wu Yueru Chen Ziyan Qian Hongren Chen Waichin Li Qihou Li Shengguo Xue | 2023 | Journal of Environmental Sciences2023，，8： | 0 |
| 20 | Straw addition increases enzyme activities and microbial carbon metabolism activities in bauxite residue显示文摘Recovery of microbial functions is one of the critical processes in the nutrient cycling of bauxite residue for improving revegetation.Straw is considered to be effective to increase microbial diversity and drive the development of the microbial community,but its effect on microbial carbon metabolism has not been illustrated.The present study evaluated the effects of phosphogypsum(PG),straw(SF)and phosphogypsum plus straw(PGSF)on physicochemical properties,enzyme activities,and microbial carbon metabolism activities in bauxite residue.After 180 days incubation,PG,SF and PGSF treatment significantly reduced the residue pH from 10.85 to 8.64,9.39 and 8.06,respectively.Compared to CK treatment,SF treatment significantly increased the content of total organic carbon(TOC)and organic carbon fractions(DOC,MBC,EOC,and POC).In addition,straw addition significantly increased glucosidase,cellulose,urease,and alkaline phosphatase by 7.2-9.1 times,5.8-7.1 times,11.1-12.5 times,and 1.1-2.2 times,respectively.The Biolog results showed that straw addition significantly increased microbial metabolic activity(AWCD)and diversity in bauxite residue.Redundancy analysis indicated total nitrogen(TN)and carbon fractions(POC,MBC and DOC)were the most important environmental factors affecting microbial metabolic activity and diversity in bauxite residue.These findings provided us with a biogeochemical perspective to reveal soil formation in bauxite residue and suggested that nutrient supplement and regulation of salinity-alkalinity benefit the establishment of microbial communities and functions in bauxite residue. | Hao Wu Wei Sun Feng Zhu Yifan Jiang Shiwei Huang Johnvie Goloran Shengguo Xue | 2024 | Journal of Environmental Sciences2024，，1： | 0 |
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