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phosphorus removal from sediments by Potamogeton crispus:New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention

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Journal of Environmental Sciences 2021年第11期33卷 181-192页

作者： Hezhong Yuan Yiwei Cai Zhen Yang Qiang Li Enfeng Liu Hongbin Yin Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Department of Soil Science University of Wisconsin-Madison53706 MadisonWIUnited States College of Geography and Environment Shandong Normal UniversityJi’nan 250359China

Macrophytes are usually chosen for phytoremediation tools to remove P in eutrophic aquatic ecosystems,but the lack of test methods hinders the understanding of removal mechanism and *** this study,we used the novel technologies combined of Diffusive gradients in thin films(DGT),Planar optode(PO),and Non-invasive micro-test technology(NMT)to explore P dynamics in water-sediment continuum and rhizosphere of Potamogeton crispus over *** of the high-resolution in situ measurement showed that labile P(LPDGT)fluxes at the surficial sediment significantly decreased from approximate 120,140,and 200 pg/(cm^(2)·sec)via 30 days incubation period to 17,40,and 56 pg/(cm2•sec)via that of 15 *** synchronous increase of LPDGT was not detected in overlying water,suggesting the intense assimilation of dissolve reactive P via root over *** measurement indicated that O_(2)concentration around the rhizosphere remarkably increased and radially diffused into deeper sediment until 100%saturation along with the root stretch *** detection of roots showed the obvious O_(2)inflow into root tissue with the uppermost flux of 30 pmol/(cm2•sec)from surroundings via aerenchyma on different treatment *** from previous reports,gradually saturating O_(2)concentrations around the rhizosphere was principally driven by O_(2)penetration through interspace attributing to root stretch downward rather than root O_(2)*** O_(2)concentrations in deep sediment over time finally induced the oxidization of labile Fe(II)into Fe(III)bound P and local P immobilization.

关键词： phosphorus removal Potamogeton crispus Diffusive gradients in thin films (DGT) Planar optode(PO) Non-invasive Micro-test Technique (NMT) Rhizosphere

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phosphorus removal by adsorbent based on poly-aluminum chloride sludge

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Water Science and Engineering 2020年第3期13卷 193-201页

作者： Hui-fang Wu Jun-ping Wang Er-gao Duan Wen-hua Hu Yi-bo Dong Guo-qing Zhang Department of Municipal Engineering Nanjing Tech UniversityNanjing 211800China

phosphorus adsorption tests were carried out using poly-aluminum chloride sludge(PACS),which was collected from a water treatment plant in *** amount of phosphorus adsorbed by PACS increased quickly within the first hour and reached equilibrium after about 48 *** adsorption behavior of PACS for phosphorus is consistent with the Langmuir adsorption isotherm equation(R2>0.99)and parallel first-order kinetic equation(R2>0.98).With the increase of the PACS concentration,the adsorption capacity of PACS for phosphorus decreased,and the removal rate *** results of batch tests showed that the adsorption capacities of PACS for phosphorus ranged from 1.64 to 1.13 mg/g when the pH value varied from 4 to ***,the adsorption capacity of PACS was not evidently influenced by *** comparison with the ion exchange resin,the adsorption capacity of PACS was barely inhibited by competitive ions,such as SO24,NO3,and Cl.The PACS surface after adsorption became smooth,and the vibration peaks of AleO and AleOH *** HCl and NaOH have a strong desorption effect on PACS after adsorption saturation,and with higher concentrations of HCl and NaOH,the desorption effect was *** of column adsorption experiments showed that with lower phosphorus and hydraulic loads,the adsorption column took longer to reach *** indicated that PACS could be used as an efficient material for removal of phosphorus from *** study provides a new treatment method with PACS.

关键词： Poly-aluminum chloride sludge(PACS) phosphorus removal Adsorption characteristics Batch adsorption test Column adsorption test

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phosphorus removal USING STEEL SLAG

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Acta Metallurgica Sinica(English Letters) 2006年第6期19卷 449-454页

作者： R.W. Smith Metallurgical and Materials Department Nevada University of Reno NV89503 Nevada USA

Steel slag is a byproduct produced in large amounts in the steel-making process. It is an important resource that can be effectively utilized. An experiment was described in which steel slag was tested as an adsorbent for the removal of phosphorus from waste water. phosphorus removal depended on the amount of steel slag added, the pH value, the contact time, and the initial concentration. Under laboratory conditions when the added slag was 7.5g/L, the contact time 2h, and the pH value was equivalent to 6.5, over 99% of the phosphorus was removed; the experimental data on steel slag adsorption of phosphorus in the water fitted the Freundlich isotherm model. Steel slag was found to be very effective in adsorbing phosphorus.

关键词： steel slag waste water phosphorus removal

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Application of Wood Char in Processing Oolitic High-phosphorus Hematite for phosphorus removal

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Journal of Iron and Steel Research International 2016年第2期23卷 109-115页

作者： Hui-qing TANG Yan-qi QIN Teng-fei QI Zhi-lei DONG Qing-guo XUE State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

phosphorus removal from oolitic high-phosphorus hematite using direct reduction followed by melting sep aration was investigated. At the direct reduction stage, highly volatile wood char was prepared by carbonizing jujube wood at 673 K for 2 h and was used as reducing agent. The results of the direct reduction tests show that at a tem- perature of 1373 K, a char mixing ratio of 0.8, and a reduction time of 10-25 min, the briquettes reached a metal- lization degree of 80% -84% and a residual carbon content of 0.13 -1.98 mass%. phosphorus remained in the gangue as calcium phosphate after reduction. The results of the melting separation tests show that residual carbon in reduced briquette negatively affects the phosphorus content （W[p]） in hot metal. When the reduced briquettes ob- tained under the aforementioned conditions were used for melting separation, hot metal suitable for basic oxygen steelmaking （w[p]〈0.4 mass%） could not be obtained from metallic briquettes with a residual carbon content more than 1.0 mass~. In contrast, it could be obtained from metallic briquettes with residual carbon content less than 0.35 mass% by mixing with 2%-4% Na2CO3.

关键词： high-phosphorus hematite wood char direct reduction melting separation phosphorus removal

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Nitrogen and phosphorus removal under intermittent aeration conditions

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Journal of Environmental Sciences 2002年第4期14卷 541-546页

作者： XIA Si\|qing, GAO Ting\|yao, ZHOU Zeng\|yan (State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.) Tongji University State Key Laboratory of Pollution Control and Resource Reuse 上海 200092 Tongji University State Key Laboratory of Pollution Control and Resource Reuse 上海 200092

A practice wastewater treatment plant was operated using intermittent aeration activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of COD Cr , BOD 5, TN, TP, NH 3\|N, TKN, and SS varied in a range of 207.5—1640 mg/L, 61.8—637 mg/L, 28.5—75.6 mg/L, 4.38—20.2 mg/L, 13.6—31.9 mg/L, 28.5—75.6 mg/L, and 111—1208 mg/L, the effluent means were less than 50 mg/L, 20 mg/L, 5 mg/L, 1.0 mg/L, 5 mg/L, 10 mg/L, and 20 mg/L, respectively. Based on a long time of operating results, this process is very suitable for nutrient biological removal for treating the municipal wastewater those water characteristics are similar as that of the Songjiang Municipal Waste Water Treatment Plant(SJMWTP).

关键词： intermittent aeration process high concentration activated sludge nitrogen removal phosphorus removal

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Evaluation of phosphorus removal from wastewater by soils in rural areas in China

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Journal of Environmental Sciences 2010年第1期22卷 15-22页

作者： Hanwen Liang, Junxin Liu, Yuansong Wei, Xuesong GuoResearch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China [a] Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Low-cost, easy-maintenance and high-efficiency decentralized wastewater treatment technologies are urgently needed in rural areas of China. Processes with high potential for phosphorus removal are of great interest. However, commonly used treatment methods often do not meet the strict criteria for removing phosphorus from rural wastewater. In order to search an economic and simple technology for phosphorus removal from the common bit-technologies effluent, seven soil types collected from different rural areas in China were investigated for their ability to remove phosphorus. X-ray diffraction （XRD） was used to analyse the mineral structure, and inductively coupled plasma optical emission spectrometer （ICP-OES） was used to analyse the geochemical composition of the soil samples. Three primary minerals - quartz, albite and montmorillonite - were clearly detected. The samples were divided into two soil types, acidic soils and alkaline soils, based on their pH values. The geochemical composition study indicated that a higher percentage of Ca and Mg occurred in alkaline soils （pH 〉 8） than in acidic soils （pH 〈 6.5）. Adsorption isotherms from batch experiments fitted the Langmuir and Freundlich models well, the maximum P adsorption capacities ranged from 0.256 to 1.598 mg P/g, indicating a high phosphorus removal potential for all of these soils. The P fractions extracted revealed that the sum of NaOH-extracted inorganic P （NaOH-Pi） was the major P component in the acidic soils, and CaCO3-bound phosphorus （Ca-P） in the alkaline soils. Dynamic adsorption simulation showed that these soils have the ability to remove phosphorus from wastewater.

关键词： adsorption phosphorus removal rural areas wastewater treatment

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Ammonia and phosphorus removal from using cash crop waste-derived agricultural runoff biochars

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 141-153页

作者： Alisa Salimova Jian'e Zuo Fenglin Liu Yajiao Wang Sike Wang Konstantin Verichev State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Beijing JingYi Air Protection&Technology Company Wanda Plaza93 Jianguo RoadChaoyang DistrictBeijing 100022China Institute of Civil Engineering Faculty of Engineering SciencesUniversidad Austral de ChileValdivia 5090000Chile

Adsorption of biochars(BC)produced from cash crop residuals is an economical and practical technology for removing nutrients from agricultural *** this study,B C made of orange tree trunks and tea tree twigs from the Laoguanhe Basin were produced and modified by aluminum chloride(Al-modified)and ferric sulfate solutions(Fe-modified)under various pyrolysis temperatures(200℃-600℃)and residence times(2-5 h).All produced and modified B C were further analyzed for their abilities to adsorb ammonia and phosphorus with initial concentrations of 10-40 mg/L and 4-12 mg/L,***-modified Tea Tree B C 2h/400℃showed the highest phosphorus adsorption capacity of 0.56 mg/***-modified Orange Tree B C 3h/500℃showed the best performance for ammonia removal with an adsorption capacity of 1.72 mg/*** characterization showed that P=O bonds were formed after the adsoiption of phosphorus by modified BC,N-H bonds were formed after ammonia adsorption.X P S analysis revealed that the key process of ammonia adsorption was the ion exchange between K+and N H *** adsorption was related to oxidation and interaction between PO43-and Fe3+.According to X R D results,ammonia was found in the form of potassium amide,while phosphorus was found in the form of iron hydrogen *** sorption isotherms showed that the Freundlich equation fits better for phosphorus adsorption,while the Langmuir equation fits better for ammonia *** simulated runoff infiltration experiment showed that 97.3%of ammonia was removed by Al-modified Orange tree B C 3h/500℃,and 92.9%of phosphorus was removed by Fe-modified Tea tree B C 2h/400℃.

关键词： Biochar Adsorption Ammonia removal phosphorus removal Agricultural runoff

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Determination of operational parameters of anaerobic phase for enhanced phosphorus removal in MBR

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Journal of Environmental Sciences 2004年第1期16卷 67-72页

作者： HESheng-bing WANGBao-zhen WANGLin JIANGYi-feng WaterPollutionControlResearchCenter HarbinInstituteofTechnologyHarbin150090China

Two runs of experiments were carried out to obtain an understanding of phosphorus release and uptake under the anaerobic condition and then the aerobic condition respectively. Under anaerobic condition, it was found that the extent of phosphorus release appeared to increase with the increase of the initial organic loading rate when the initial organic loading rate was up to 0.1 gSCOD/gMLSS. When the initial organic loading rate was higher than 0.1 gSCOD/gMLSS, the amount of phosphorus release per unit mass of MLSS reached nearly a same stationary value, and it seemed this is not affected by organic loading rate when there is external available substrate remained. In addition, the effect of NOx-N on the phosphorus release and uptake was also investigated, it was proved that the denitrifiers has an advantage over polyphosphate accumulating bacteria in competition for organic substrate under anoxic condition. Therefore, the existence of NOx-N is disadvantageous to the phosphorus release. Based upon the above investigations, the process configuration of membrane bioreactor(MBR) in combination with anaerobic phase was proposed to enhance the removal of phosphorus in treating domestic wastewater. During the experimental period of four months, average removals of 92.50%, 84.25%, 100%, 94.09% and 85.33% were achieved for COD, TP, SS, NH_3-N and TN respectively.

关键词： wastewater treatment MBR anaerobic phosphorus removal

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Long-term effects of silver nanoparticles on performance of phosphorus removal in a laboratory-scale vertical flow constructed wetland

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Journal of Environmental Sciences 2020年第1期32卷 319-330页

作者： Juan Huang Jun Xiao Yang Guo Wenzu Guan Chong Cao Chunni Yan Mingyu Wang School of Civil Engineering Southeast UniversityNanjing 211189China Security Support Center for Urban Water Supply of Jiangsu Province Nanjing 210036China

Silver nanoparticles(AgNPs)have been widely used in many fields,which raised concerns about potential threats to biological sewage treatment *** this study,the phosphorus removal performance,enzymatic activity and microbial population dynamics in constructed wetlands(CWs)were evaluated under a long-term exposure to Ag NPs(0,50,and 200μg/L)for 450 *** have shown that Ag NPs inhibited the phosphorus removal efficiency in a short-term exposure,whereas caused no obviously negative effects from a long-term ***,in the coexisting CW system of Ag NPs and phosphorus,competition exhibited in the initial exposure phase,however,cooperation between them was observed in later *** activity of acid-phosphatase at the moderate temperature(10–20℃)was visibly higher than that at the high temperature(20–30℃)and CWs with Ag NPs addition had no appreciable differences compared with the ***-throughput sequencing results indicated that the microbial richness,diversity and composition of CWs were distinctly affected with the extension of exposure time at different Ag NPs ***,the phosphorus removal performance of CWs did not decline with the decrease of polyphosphate accumulating organisms(PAOs),which also confirmed that adsorption precipitation was the main way of phosphorus removal in *** study suggested that Ag NPs and phosphorus could be removed synergistically in the coexistence *** work has some reference for evaluating the influences of Ag NPs on the phosphorus removal and the interrelation between them in CWs.

关键词： Silver nanoparticles(AgNPs) phosphorus removal Constructed wetlands Enzymatic activity Microbial community

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Optimum operation conditions of nitrogen and phosphorus removal by a biofilm-activated-sludge system

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Journal of Environmental Sciences 2003年第1期15卷 25-30页

作者： LIUJun－xin J．W．vanGroenestijin ResearchCentreforEco－EnviromentalSciences ChineseAcademyofSciencesBeijing100085China DepartmentofEnvironmentalBiotechnoloty TNOInstituteofEnviromentalSciencesEnergyReseachandProc

In the biofilm and activated sludge combined system, denitrifying bacteria attached on the fibrous carriers in the anoxic tank, while the sludge containing nitrifying and phosphorus removal bacteria was only recirculated between the aerobic and anaerobic tanks. Therefore, the factors affected and restricted nitrification, denitrification and phosphorus removal in a traditional A/A/O process were resolved. This paper describes the optimum operation conditions for nitrogen and phosphorus removal using this system.

关键词： nitrification denitrification phosphorus removal biofilm activated sludge

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