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Seasonal and Spatial Variability of Water Quality and nutrient removal Efficiency of Restored Wetland： A Case Study in Fujin National Wetland Park, China

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Chinese Geographical Science 2018年第6期28卷 1027-1037页

作者： LI Nan TIAN Xue LI Yu FU Hongchen JIA Xueying JIN Guangze JIANG Ming Center for Ecological Research Northeast Forestry University Harbin 150040 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agricultural Chinese Academy of Science Changchun 130102 China Sanhuanpao National Natural Reserve Fujin 156100 China Fujin National Wetland Park Service Fujin 156100 China

To investigate the spatio-temporal and compositional variation of selected water quality parameters and understand the puri- fying effects of wetland in Fujin National Wetland Park （FNWP）, China, the trophic level index （TLI）, paired samples t-test and correla- tion analysis were used for the statistical analysis of a set of 10 water quality parameters. The analyses were based on water samples collected from 22 stations in FNWP between 2014 and 2016. Results initially reveal that total nitrogen （TN） concentrations are above class V levels （2 mg/L）, total phosphorus （TP） concentrations are below class III levels （0.2 mg/L）, and that all other parameters fall within standard ranges. Highest values for TN, pH, and Chlorophyll-a were recorded in 2016, while the levels of chemical oxygen de- mand （CODMn） and biochemical oxygen demand （BODs） were lowest during this year. Similarly, TN values were highest between 2014 and 2016 while dissolved oxygen （DO） concentrations were lowest in the summer and TP concentrations were highest in the autumn. Significant variations were also found in Secchi depth （SD）, TN, CODMn （P 〈 0.01）, TP, and DO levels （P 〈 0.05） between the inlet and outlet of the park. High-to-low levels of TN, TP, and TDS were found in cattails, reeds, and open water （the opposite trend was seen in SD levels）. Tested wetland water had a light eutrophication status in most cases and TN and TP removal rates were between 7.54%-84.36% and 37.50%-70.83%, respectively. Data also show no significant annual changes in water quality within this wetland, although obvious affects from surrounding agricultural drainage were nevertheless recorded. Results reveal a high major nutrient removal efficiency （N and P）. The upper limits of these phenomena should be addressed in future research alongside a more efficient and scientific agricultural layout for the regions in and around the FNWP.

关键词： restored wetland water quality purification nutrient removal seasonal and spatial variability Fujin National Wetland Park(FNWP)

Effect of Slash Burning on nutrient removal and Soil Fertility in Chinese Fir and Evergreen Broadleaved Forests of Mid-Subtropical China

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Pedosphere 2003年第1期13卷 87-96页

作者： YANG YUSHENG, GUO JIANFEN, CHEN GUANGSHUI, HE ZONGMING and XIE JINSHENGFujian Agriculture and Forestry University, Nanping 353001 (China) Fujian Agriculture and Forestry University Nanping 353001 (China)

A Chinese fir forest (Cunninghamia lanceolata, CF) and an evergreen broadleaved forest (EB) located inFujian Province, southeastern China, were examined following slash burning to compare nutrient capital andtopsoil properties with pre-burn levels. After fire, nutrient (N, P and K) removal from burning residues wasestimated at 302.5 kg ha-1 in the CF and 644.8 kg ha-1 in the EB. Fire reduced the topsoil capitals of totalN and P by about 20% and 10%, respectively, in both forests, while K capital was increased in the topsoils ofboth forests following fire. Total site nutrient loss through surface erosion was 28.4 kg (N) ha-1, 8.4 kg (P)ha-1 and 328.7 kg (K) ha-1 in the CF. In the EB, the losses of total N, P and K were 58.5, 10.5 and 396.3kg ha-1, respectively. Improvement of soil structure and increase in mineralization of nutrients associatedwith increased microbe number and enzyme activities and elevated soil respiration occurred 5 days after ***, organic matter and available nutrient contents and most of other soil parameters declined one yearafter fire on the burned CF and EB topsoils. These results suggest that short-term site productivity canbe stimulated immediately, but reduced subsequently by soil and water losses, especially in South China,where high-intensity precipitation, steep slopes and fragile soil can be expected. Therefore, the silviculturalmeasurements should be developed in plantation management.

关键词： chinese fir evergreen broadleaved forest nutrient removal slashburning soil fertility

Isolation of microalgae with growth restriction and nutrient removal from alkaline wastewater

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International Journal of Agricultural and Biological Engineering 2015年第6期8卷 62-68页

作者： Ji Fang Wang Yingkuan Li Gang Zhou Yuguang Dong Renjie College of Engineering/Biomass Engineering Center China Agricultural UniversityBeijing 100083China Key Laboratory of Clean Production and Utilization of Renewable Energy Ministry of AgricultureP.R.ChinaBeijing 100083China Chinese Academy of Agricultural Engineering Beijing 100125China

In order to isolate a well-tolerated microalgae strain and study its capability of wastewater treatment,a newly microalgae strain was isolated and identified from fresh *** phylogenetic analysis indicates that this strain has a close relationship with Desmodesmus sp.,named as EJ *** effects of temperature,pH value and NaCl concentration on growth of Desmondesmus *** investigated;the capability of nutrient removal from alkaline wastewater was also *** *** 9-2 had a wide pH adaptation range(3-12)and could remove nitrogen,phosphorus and COD which might substantially decrease the cost of biofuel *** research can provide evidence for outdoor large-scale cultivation of microalgae.

关键词： microalgae isolation growth restriction alkaline wastewater nutrient removal algae-based fuel wastewater treatment

Model assessment of nutrient removal via planting Sesuvium portulacastrum in floating beds in eutrophic marine waters:the case of aquaculture areas of Dongshan Bay

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Acta Oceanologica Sinica 2019年第12期38卷 91-100页

作者： Xuehai Liu Xinming Pu Donglian Luo Jing Lu Zili Liu First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Fujian Fishery Research Institute Xiamen 361012China Laboratory of Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China Key Laboratory of Science and Engineering for the Marine Ecological Environment Ministry of Natural ResourcesQingdao 266061China

Many coastal seas are severely eutrophic and required to reduce nutrient concentrations to meet a certain water quality *** proposed a method for nutrient removal by planting Sesuvium portulacastrum at the water surface using the floating beds in the aquaculture area of the Dongshan Bay as an example,which is an important net-cage culture base in China and where dissolved inorganic nitrogen(DIN)and dissolved inorganic phosphate(DIP)reach 0.75 mg/L and 0.097 mg/L,respectively far exceeding China’s Grade IV water quality *** simulations were taken using the ecological model,field observations and field plantation experimental results to assess the environmental restoration effects of planting *** at some certain spatial *** field experiments suggested that the herbs can absorb 377 g/m^2 nitrogen and 22.9 g/m^2 phosphorus in eight months with an inserting density of^60 shoot/m^*** numerical experiments show that the greater the plantation area is,the more nutrient *** in^12%of the study area could lower nutrients to the required Grade II standards,i.e.,0.2 mg/L

关键词： phytoremediaton Sesuvium portulacastrum ecological model nutrient removal

Microalgal Cultivation in Secondary Effluents:Enhancement of Algal Biomass,nutrient removal,and Lipid Productivity

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Journal of Ocean University of China 2020年第6期19卷 1461-1470页

作者： ZHANG Bo MENG Fanping CUI Hongwu DOU Xiang DU Shuhao PENG Xiaoling Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China

The growth performance,nutrient removal,lipid accumulation and morphological changes of Cyanobacterium aponinum OUC1 and Scenedesmus obliquus which were cultured in secondary effluents from two wastewater treatment plants:Tuandao Wastewater Treatment Plant(ETD)and Licun River Wastewater Treatment Plant(ELR)were *** results showed that both *** OUC1 and *** have superior growth performances in both undiluted effluents,while the better of them was that in ETD effluent,with cell densities of *** OUC1 and *** increased by 159%and 66%over that of BG11(control),*** nutrient removal,*** could completely remove inorganic phosphorus,and decrease ammonia nitrogen in ETD effluent by 81%.In addition,both *** OUC1 and *** cultivated in ETD exhibited extraordinary potential for biofuel production,increasing lipid productivities by 133%and 89%of that cultivated in ELR,*** to ultrastructural changes,the differences in the lipoidal globules and glycogen granules of *** and *** OUC1 among the ETD and ELR treatments were mostly related to phosphorus *** findings from this research reveal the probability using the secondary effluents as cultivation media to enhance algal biomass,nutrient removal and lipid productivity.

关键词： secondary effluent nutrient removal lipid Cyanobacterium aponinum OUC1 Scenedesmus obliquus

Comparative study on cultivation of microalgae for nutrient removal and lipid production in different artificial wastewaters

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 107-114页

作者： Hao Rui Yu Zhen Li Jinchen Gao Min Ma Weiling Zhu Yi College of Food Science and Nutritional Engineering China Agricultural UniversityBeijing 10083China

Wastewater contains high concentration of nutrients,like nitrogen and phosphorus,which have been identified as the main reasons for water eutrophication and serious ecological ***,cultivating a tolerant and adaptive microalgae strain in wastewater is considered as a promising approach for sustainable biomass/lipid *** potential usages of Desmodesmus *** biomass and lipid production within different artificial wastewater(AW)were investigated and the removal efficiencies of nutrient were *** maximum removal rate of chemical oxygen demand,ammonia nitrogen,nitrate nitrogen and phosphate were 272 mg/(L·d),14.021 mg/(L·d),7.774 mg/(L·d)and 3.347 mg/(L·d),respectively in AW2,AW3,AW5 and *** biomass(1.159 g/L)and lipid(280 mg/L)productions were observed in AW5,while the highest lipid content achieved was 37.42%in *** acid analysis showed that lipids extracted from AW-cultivated Desmodesmus *** 59.57%-77.79%polyunsaturated fatty acids(30.6%-44.47%was linoleic acid).

关键词： microalgae Desmodesmus sp. artificial wastewater nutrient removal biomass production lipid production

Practice of High Concentration Sludge for Efficient nutrient removal from Municipal Sewage

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Journal of Donghua University(English Edition) 2010年第3期27卷 430-434页

作者：李昂张雁秋李燕 School of Environment Science and Spatial Informatics China University of Mining and Technology Jiangsu Key Laboratory of Resources and Environmental Information Engineering China University of Mining and Technology

ECOSUNIDE is a new activated sludge process based on the sludge concentration optimization *** it,we carried out a high sludge concentration by changing influent mode and distributing carbon source in a reasonable way,which can improve the ecological superiority of nitrification and denitrification for the growth of phosphorous accumulating organisms(PAOs)and nitrifiers and raised the nutrient removal efficiency of municipal sewage treatment *** 2007,we adopted this technique in Linyi Sewage Treatment Plant in Shandong Province,*** the reconstruction,we achieved the high efficiency of nutrient removal with low investment under the dynamic load of the secondary sewage treatment *** effluent water qualities meet the classⅠ-A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)and the rest effluent indexes meet the classⅠ-B ***,we have above 20% operating cost cut by stopping the internal reflux without power charge increased and any new pool structures built.

关键词： ECOSUNIDE sludge concentration optimization high sludge concentration nutrient removal

Developement of processes for nutrient removal from wastewater

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科技视界 2017年第2期 65-67页

作者： M.S.Le M.L.Yu H Zheng Zhejiang Reach Green Envirotech Co. Ltd

This review focuses on techniques for achieving very low concentration of TN and TP in *** 1970 Clean Water Act in the US and the Urban Waste Water Treatment Directive in Europe now provide the benchmark standards for TN and TP *** and Lockett discovered activated sludge in the 1910’*** then,many improvements have been made to the biological treatment process to provide various configurations that have the ability to deliver effluent concentrations between 6-8mg TN/L and 0.5-1.0mg TP/L,without external carbon ***,however,additional advanced nutrient removal technologies are used in tertiary treatment to meet more stringent effluent quality *** advanced technology that has been successfully implemented in the US is denitrifying *** TP removal,tests showed that the BlueP RO and CoM ag systems both reliably met an effluent target as low as 0.04 mg TP/***,the establishment of stringent TN and TP effluent limits will dramatically increase the capital and operational costs of wastewater treatment plants.A more promising nutrient capturing process is based on the assimilation of nutrients(both N and P)during heterotrophic growth which uses a carbon source for *** trials of the single step process by Reach Green suggest that concentrations as low as 0.5 mg TN/L and 0.02mg TP/L are readily achievable.

关键词： nutrient removal Wastewater Environment Phosphorus Treatment standards Denitrification Carbon source

Development of Biofilter Devices for nutrient removal From Wastewater

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科技视界 2017年第2期 42-43,171页

作者： M.S.Le M.L.Yu H zheng Zhejiang Reach Green Envirotech Co. Ltd

nutrient pollution still remains one of the greatest challenges to water quality contributing to harmful contaminations water sources,and costly impacts on the *** review considers the development of the biofilters,focusing on the design features that have the most influence on their technical and economic *** biofilters,based on SAF technology,are particularly suitable for sewage treatment works with throughput rates up to 1,000m^3/*** main advantages of SAF plants include high quality effluent,low power usage and small footprint.A wide range of filter media are available for different designs,which could be configured for both aerobic and anaerobic treatment in BOD and/or ammonia reduction *** two most important parameters for filter media are their Specific Surface Area(SSA,m^2/m^3)and Void Fraction(percentage of void volume or porosity).However,due to the risk of clogging by suspended solids or excess sludge the media used for this application should be limited to about 500m^2/m^*** tertiary treatment or river restoration applications where the influents tend lack any readily biodegradable substrates,SAF design provides the most appropriate choice for further development to produce effluents with very low nutrient levels.

关键词： Bio-filter devices nutrient removal Wastewater Biofilms Filter media Submerged Aerated Filter SAF design