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Natural organic matter quantification in the waters of a semiarid freshwater wetland (Tablas de Daimiel, Spain)

Journal of Environmental Sciences 2013年第1期25卷 114-123页

作者： Montserrat Filella Juan Carlos Rodríguez-Murillo Franc ois Quentel Institute F.-A. Forel University of Geneva10 route de SuisseCH-1290 Versoix Switzerland Museo Nacional de Ciencias Naturales CSICSerrano 115 E-28006 MadridSpain Laboratoire de Chimie Analytique UMR-CNRS 6521 Universit de Bretagne Occidentale6 avenue V.Le GorgeuCS 93837F-29238 Brest Cedex 3France

Dissolved organic matter （DOM） concentrations have been measured in the waters of a semiarid freshwater wetland, the Tablas de Daimiel, Spain, when the system-characterised by variable hydroperiodicity conditions, was completely flooded （February 2011）. Fluxes of DOM from the wetland soils to the overlying waters were measured by using a passive diffusion sampler （peeper）. Not only dissolved organic carbon （DOC） concentrations were measured but refractory organic matter （ROM, usually known as humic substances） was also quantified using a novel voltammetric method. Fluorescence spectra were recorded to help in selecting the appropriate standard for ROM quantification, test the homogeneity of DOM in the waters and get an indication of their source. The results obtained show a 7-fold increase in measured ROM concentrations from the Gigtiela River to the outlet, which points to a net exportation of ROM from the wetland and to the existence of an internal source of ROM in the system, probably diffusion from the wetland soils. This hypothesis is confirmed by the flux of ROM from the soils to the water column measured with the peeper and by the common fluorescence characteristics of colunm and interstitial waters. The smaller increase in DOC concentrations along the wetland, in spite of the higher DOC fluxes from soils, suggests that there is significant turnover of organic carbon （OC） in the water column. The system acts as a major carbon sink but, when flooded, exports .OC as DOM.

关键词： organic carbon natural organic matter refractory organic matter DOC ROM humic wetland Daimiel

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wetland loss in Turkey over a hundred years:implications for conservation and management

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Ecosystem Health and Sustainability 2021年第1期7卷 174-186页

作者： Murat Ataol Ortaç Onmuş Department of Geography ÇankırıKaratekin UniversityÇankırıTurkey Natural History Museum Research and Application Centre and Department of BiologyEge UniversityIzmirTurkey

The aims of this study were to provide a complete inventory of wetlands in Turkey including their past status(1910-1930)in comparison to the present time(2014).The types of wetlands and their area sizes were determined by using cartographical maps of 1/200,000 in scale made between 1910s and 1920s vs.2006 CORINE Land Cover data,which were updated with Landsat 8 satellite images in *** effect of possible climate change on wetlands sizes various local,national and regional rainfall datasets were analysed by correlation and regression analysis.A hundred years ago,the total number of natural wetlands was 1299 with a total surface area of 1,376,505 *** 2014,the total number of natural wetlands had decreased to 900,with a total surface area of 1,085,936 hectares,so that 21.2%of the original wetlands were lost(291,339 hectares).The observed changes in the number of wetlands and their relative sizes cannot be attributed directly to changes in *** drainage was largely responsible for observed wetland losses,but local changes in precipitation regimes partially contributed to this *** conservation and restoration of wetlands are recommended to avoid further loss of wetlands in Turkey.

关键词： wetland wetland loss drainage dams and reservoirs turkey conservation and management areal extent

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Enhanced nitrogen removal and microbial analysis in partially saturated constructed wetland for treating anaerobically digested swine waste water

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 57-67页

作者： Zhenfeng Han Ying Miao Jing Dong Zhiqiang Shen Yuexi Zhou Shan Liu Chunping Yang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University)Ministry of EducationChangsha 410082China College of Environmental Science and Engineering Chang5an UniversityXi'an 710061China Beijing Municipal Research Institute of Environmental Protection Beijing 100037China

Nitrogen removal of wastewater containing high-strength ammonium by the constructed wetlands (CWs) has been paid much attention. In this study, the ability of a partially saturated CW to treat anaerobically-digested decentralized swine wastewater under varying operating parameters from summer to winter was investigated. The partially saturated CW achieved better NH4^+-N and TN removal by tidal flow than intermittent flow. With surface loading rates of 0.108, 0.027, and 0.029 kg/(m^2·d) for COD, NH4^+-N, and TN, the partially saturated CW by tidal operation achieved corresponding removal efficiencies of 85.94%, 61.20%, and 57.41%, respectively, even at 10℃. When the rapid-adsorption of NH4^+-N and the bioregeneration of zeolites reached dynamically stable, the simultaneous nitrification and denitrification in the aerobic zeolite layer was observed and accounted for 58.82% of the total denitrification of CW. The results of Illumina high-throughput sequencing also indicated that nitnfiers (Nitrospira and Rhizomicrobiurri) and denitrifiers (Rhodanobacter and Thauera) simultaneously existed in the zeolite layer. The dominant existence of versatile organic degraders and nitrifiers/denitrifiers in the zeolite layer was related to the removal of most COD and nitrogen in this zone. The contribution of the possible nitrogen removal pathways in the CW was as follows: nitrification-denitrification (86.55%)>substrate adsorption (11.70%)>plant uptake (1.15%)>microbial assimilation (0.60%).

关键词： Constructed wetland Decentralized swine wastewater Biozeolite Simultaneous nitrification and denitrification Nitrogen removal pathway

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Removal of tetrachlorobisphenol A and the effects on bacterial communities in a hybrid sequencing biofilm batch reactor-constructed wetland system

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 147-157页

作者： Xiaohui Wang Shuai Du Tao Ya Zhiqiang Shen Jing Dong Xiaobiao Zhu Department of Environ mental Scie nee and Engineering College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China Beijing Municipal Research Institute of Environmental Protection Beijing 100037 China

Tetrachlorobisphenol A (TCBPA) released into the sewage may cause environmental pollution and health risk to human beings. The objective of this study was to investigate the removal ofTCBPA and bacterial community structures in a laboratory-scale hybrid sequencing biofilm batch reactor (SBBR)- constructed wetland (CW) system. The results showed that the removal efficiency of chemical oxidation demand (COD), ammonia, total nitrogen and total phosphorus in the SBBR-CW system was 96.7%, 97.3%, 94.4%, and 8&6% respectively. At the stable operation stage, the system obtained a 71.7%±1.8% of TCBPA removal efficiency with the influent concentration at 200μg/L. Illumina MiSeq sequencing of 16S rRNA gene revealed that the presence of TCBPA not only reduced the bacterial diversity in the SBBR-CW system, but also altered the composition and structure of bacterial community. After the addition of TCBPA, Proteobacteria increased from 31.3% to 38.7%, while Acidobacteria and Parcubacteria decreased greatly in the SBBR. In contrast, Acidobacteria replaced Proteobacteria as the dominant phylum in the upper soils of CW. The results indicated that TCBPA stimulated the growth of GAOs in the SBBR without deteriorating the phosphorus removal due to the presence of sufficient carbon sources. The ammonia oxidizing bacteria, Nitrosomonas, and denitrification bacteria, Hyphomicrobium and Pseudomonas, were inhibited by TCBPA, resulting in a decreasing the removal efficiency of TN and ammonia.

关键词： SBBR Constructed wetland Tetrachlorobisphenol A Microbial community structure

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Vertical distribution of rare earth elements in a wetland soil core from the Sanjiang Plain in China

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Journal of Rare Earths 2012年第7期30卷 731-738页

作者：程红光郝芳华欧阳威刘少卿林春野杨文静 State Key Joint Laboratory of Environmental Simulationand Pollution Control School of EnvironmentBeijing Normal University

The objective of this study was to investigate the vertical distribution of rare earth elements （REEs） in a natural wetland soil core to understand the influence of natural and anthropogenic activities on geochemical behavior of REEs. A natural wetland soil core of 95 cm was collected from the Sanjiang Plain in China and sliced into 5 cm slices for analyses of REEs, Fe, Al, Mn, Sc, Y, and soil organic matter （SOM）. Results indicated that SOM was accumulated in the upper part of the soil core （0 to 20 cm depth）, while Fe and Mn was reductively leached from the upper part of the soil core and accumulated in the low part. The content of total REEs ranged from 137.9 to 225.9 mg/kg in the soil core. Content profiles obtained for all REEs were almost identical except for Ce. The highest contents of REEs generally occurred at about 20 cm depth, but enrichment factor （EF） of REEs except Ce was usually the highest in the surface horizon. Average EF ranged from 1.1 for La to 2.1 for Gd. The pronounced shift in EF occurred at about 40 cm depth and it gradually increased from 40 cm depth to surface （except for Ce）, probably suggesting anthropogenic atmospheric deposition of REEs. In comparison with chondrite, Eu was depleted in all horizons, while Ce was negatively anomalous in the top horizons and positively anomalous in the bottom horizons. This positive anomaly of Ce in the bottom horizons was due to its preferential adsorption on Fe and Mn oxides, relative to other REEs. Although both natural and anthropogenic activi-ties influence the geochemical behaviors of REEs in soils, enrichment or mobility of REEs is low in the natural wetland soil core of the San-jiang Plain.

关键词： wetland soil core rare earth element distribution enrichment factor

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Nitrate removal to its fate in wetland mesocosm filled with sponge iron:Impact of influent COD/N ratio

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 77-85页

作者： Zhihao Si Xinshan Song Xin Cao Yuhui Wang Yifei Wang Yufeng Zhao Xiaoyan Ge Awet Arefe Tesfahunegn College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile IndustryDonghua UniversityShanghai 201620China

Sponge iron(s-Fe°)is a porous metal with the potential to be an electron donor for *** study aims to evaluate the feasibility of using s-Fe as the substrate of wetland ***,wetland mesocosms with the addition of s-Fe"particles(CW-Fc)and a blank control group(CW-CK)were *** NOj-N reduction property and water quality parameters(*** ORP)were examined at three COD/N ratios(*** 10).Results showed that the NO3--N removal efficiencies were significantly increased by 6.6 to 58.9%in the presence of s-Fe NH4+-N was mainly produced by chemical denitrification,and approximately 50% of the NO3--N was reduced to N4+-N,at the COD ratio of *** increase of the influent COD/N ratio resulted in lower chemical denitrification and higher *** chemical denitrification mediated by s-Fe led to an accumulation of NH4+-N at COD/N ratios of 0 and *** TIN removal efficiencies increased by 4.5#12.4#.Moreover,the effluent pll,*** ORP values showed a significant negative correlation with total Fe and Fe(II)(Pwetland mcsocosm.

关键词： Sponge iron wetland mesocosm Electronic donor Denitrification COD/N ratio

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Performance of different macrophytes in the decontamination of and electricity generation from swine wastewater via an integrated constructed wetland-microbial fuel cell process

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Journal of Environmental Sciences 2020年第3期32卷 252-263页

作者： Feng Liu Lei Sun Jinbao Wan Liang Shen Yanhong Yu Lingling Hu Ying Zhou School of Resources Environmental&Chemical Engineering Nanchang UniversityJiangxi 330031China School of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China Jiangxi Engineering Laboratory of Waterborne Coating School of Chemistry and Chemical EngineeringJiangxi Science and Technology Normal UniversityJiangxi 330013China School of Materials and Mechanical&Electrical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China

Plants constitute a major element of constructed wetlands(CWs).In this study,a coupled system comprising an integrated vertical flow CW(IVCW) and a microbial fuel cell(MFC) for swine wastewater tre atment was developed to research the effects of macrophytes commonly employed in CWs,Canna indica,Acorus calamus,and Ipomoea aquatica,on decontamination and electricity production in the *** of the different root types and amounts of oxygen released by the roots,the rates of chemical oxygen demand(COD) and ammonium nitrogen(NH4^+-N) removal from the swine wastewater differed as *** the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,the COD removal rates were 80.20%,88.07%,84.70%,and 82.20%,respectively,and the NH4+-N removal rates were 49.96%,75.02%,70.25%,and 68.47%,*** decontamination capability of the Canna indica system was better than those of the other *** average output voltages were 520±42,715±20,660±27,and 752±26 mV for the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,respectively,and the maximum power densities were 0.2230,0.4136,0.3614,and0.4964 W/m^3,*** aquatica had the largest effect on bioelectricity generation *** addition,electrochemically active bacteria,Geobacter and Desulfuromonas,were detected in the anodic biofilm by high-throughput sequencing analysis,and Comamonas(Proteobacteria),which is widely found in MFCs,was also detected in the anodic *** results confirmed the important role of plants in IVCW-MFCs.

关键词： Integrated vertical flow constructed wetland Microbial fuel cell Swine wastewater Dissolved oxygen(DO)

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Effectiveness of vegetation on phosphorus removal from reclaimed water by a subsurface flow wetland in a coastal area

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Journal of Environmental Sciences 2011年第10期23卷 1594-1599页

作者： Baoqing Shan Liang Ao Chunming Hu Jiayu Song Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. E-mail： bqshan@***

This work was conducted to evaluate the effectiveness and influence factors of vegetation on phosphorus （P） removal from reclaimed water in constructed wetlands. Comparisons were conducted between one pilot scale subsurface flow wetland （P-SSFW） and two demonstration subsurface flow wetlands, which were series-wound and named as first subsurface flow wetland （F-SSFW）, and second subsurface flow wetland （S-SSFW）, respectively. The three wetlands had the same vegetation and substrate, but different pH values, total dissolved solids （TDS） and P loads. Results showed that the P content in the vegetation shoots of the F-SSFW was 2.16 rag/g, while 2.31 mg/g in the S-SSFW and 2.69 mg/g in the P-SSFW. These differences were likely caused by the higher pH and TDS in the reclaimed water. The P content also differed among the tissues of the plant, which were 5.94-6.44 mg/g, 2.20-2.77 mg/g, 1.31-1.46 mg/g and 1.53-1.88 mg/g in the flowers, leaves, stems, and roots, respectively. The greatest discrepancy was observed in the leaves, indicating that the environment of the wetlands had the greatest influence on the leaves. When the total phosphorus （TP） load was lower, the proportion of P removed by vegetation assimilation was 16.17% in the P-SSFW, 12.90% in the F-SSFW and 13.29% in the S-SSFW. However, the relative removal efficiency by vegetation among the three wetlands did not vary greatly from that observed in other studies. Moreover, the influence of pH, TDS and TP load was not as great as the influence of the vegetation species, type of substrate, influent style or climate.

关键词： wetland reclaimed water phosphorus coastal area Phragmites communis Trim

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Hydrological setting of infertile species-rich wetland——a case study in the warm temperate Japan

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Journal of Environmental Sciences 2003年第2期15卷 279-283页

作者： Kikuchi A. Nakagoshi N. Onda Y. Graduate School for International Development and Cooperation Hiroshima UniversityGraduate School for International Development and Cooperation Hiroshima UniversityInstitute of Geoscience University of Tsukuba Higashi-Hiroshima City 739_8529 JapanHigashi-Hiroshima City 739_8529 JapanIbaraki 305_8571 Japan

The detailed groundwater flow and water chemistry to illustrate landscape structure of the infertile peatless mire by using piezometers and groundwater wells were measured. The instruments were installed in lines through a small spring-fed wetland underlying little peat from the hillslope to the valley bottom in southwestern Japan. Flow net and EC data clearly indicated that the wetland was situated in a high-EC groundwater upspring area. The low-productivity graminous vegetation was related with four hydrological factors such as: (1) high water level; (2) low-EC(wetland, and maintained the high groundwater level. In contrast, overflowing “youthful groundwater” is supplied from head of slope-wetland preferentially through the shallow substratum. The plant communities of the peatless mire in southwestern Japan are similar to those of raised bog in northern cool temperate Japan. There have been some reports verifying that the underlying mineral substrata of such wetlands were quartzile rocks such as granite, rhyolite, chart and well-leached sand. Results showed (1) low cation availability affects the water acidity; (2) upward seepage of high-EC groundwater composed the foundation of the investigated peatless mire; and (3) the poor mineral condition seems to play a similar role to northern ombrotrophic(rain-fed) condition.

关键词： eco-hydrology electrical conductivity groundwater flow plant community wetland

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Evaluation of the Biodiversity Conservation Function in Liaohe Delta wetland,Northeastern China

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Journal of Meteorological Research 2020年第4期34卷 798-805页

作者： Wenying YU Ruipeng JI Xiuzhen HAN Long CHEN Rui FENG Jinwen WU Yushu ZHANG Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166 Key Laboratory of Agrometeorological Disasters of Liaoning Province Shenyang 110166 National Satellite Meteorological Center Beijing 100081 Panjin Meteorological Bureau Panjin 124010

The scientific evaluation of the wetland biodiversity conservation function is the basis of balanced wetland protection and development. Our research sought to provide references for the protection of wetland ecological environments as well as the related planning and management policies. The study established a fitting model for evaluating the biodiversity conservation function in the Liaohe Delta, northeastern China. The new model, the wetland Biodiversity Conservation Indicator(WBCI), was with four input factors, including the vegetation coverage(VC), habitat suitability index(HI), land use and land cover(LULC) index(LI), and threat factor index(TI) of the LULC type. The values assigned to HI and TI were based on Integrated Valuation of Ecosystem Services and Tradeoffs(In VEST)habitat quality models. The weights of all the factors in WBCI were valued with the Principal Component Analysis(PCA). We evaluated the wetland biodiversity conservation function of Panjin, Liaohe Delta, China, by using the WBCI model based on Gaofen-1(GF-1) satellite data in 2018, and the result was verified with In VEST and other models. It showed that the output map was similar to that of In VEST, with the higher-quality habitat including the wetland, tidal flat, water body, and forest, as well as the lower-quality land use types including the paddy field, crop field, construction land, and land used by traffic. The wetland biodiversity conservation function was better in areas less affected by human disturbance, with very abundant species and good-quality habitat. It was poor in areas impacted by more frequent human activities such as the land cultivation, housing, and traffic, which led to the landscape fragmentation. The WBCI model provided a more accurate reflection of the bird distribution than the In VEST model. The WBCI model was able to reflect the difference in quality of each habitat grade, in contrast to the net primary productivity(NPP) method and species distribution models(

关键词： wetland biodiversity conservation function habitat quality evaluation

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