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Seasonal dynamics of nitrogen in cultivated soil at Giao Thuy district, Nam Dinh province - Ly Thi Thu HaThis study shows that total nitrogen content in 4 different land use types at the study site varied largely. The amount NO3-–N was significantly higher in the dry season, reaching its peak in May with 86.11 kg ha-1 in AV and 75.41 kg ha-1 in RV. The amount of NH4+-N concentration was higher in rainy season, but the losses were very low. In mono ...
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Removal of flouroquinolone antimicrobials (ciprofloxacin and norfloxacin) from shrimp pond sediment during composting - Nguyen Dac KienThe shrimp pond sediment has high moisture (about 80 %) and low concentration of some heavy metals. During the composting processes, the temperature varied and ranged from 25 to 55 °C, peaked at day 20th. pH varied from 6.2 to 8.3. The moisture of the piles fluctuated remarkably during 40 days, from 50.8 to 77 %. After 40 days of composting, NRF...
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Design of wetland system for wastewater quality improvement at formosa ha tinh steel company - Viet Anh NguyenFiltration media plays an important role in constructed wetland. Balancing all criteria for wetland media such as hydraulic conductivity, headloss, total footprint required, removal efficiency and favor conditions for plants to grow is a challenging exercise for locally available media. Experiments have provided valuable information for selectio...
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Preliminary study on separation of rare earth metals from leach solution of discarded fluorescent powder by solvent extraction - Nguyen Duc QuangIn this research, the efficiencies on rare-earth elements extractions as functions of pH levels, extractant concentration, O/A ratio, metal concentration were investigated. Based on that, the proper conditions of REEs recovery were set up to investigate the efficiency of Y, Eu and Tb recovery from acid leach solution that was leached from fluore...
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Experimental results of adsorption of ni (II) from wastewater using coffee husk based activated carbon - Do Thuy TienCharcoalised coffee husk at different temperatures and time conditions in Ar gas environment then adsorbed Ni (II) at pH = 4; 10 g/L charcoal, 60 minutes adsorption time, initial concentration of Ni (II) was concerned in this study. The results showed that the adsorption capacity of Ni (II) of charcoal was quite good (1.9 mg/g). Study on the den...
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Metal bioaccumulation in fishes and macro zooplankton in some lakes in Ha Noi - Pham Thi HongMetal accumulated differently in liver, gill, and muscle. Among the fish’s organs, liver had highest metal concentration. The Zn accumulation in muscle significantly correlated to water temperature. There were no correlation between tropic status and the metal accumulation in fish’s organs. A variation of metal concentrations in macro zooplankto...
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Modification of oxidized activated carbon surface by fe and mn for arsenic removal from aquerous solution - Pham Thi Hai ThinhIn order to improving adsorption properties of AC for arsenic, manganese and iron were impregnated on oxidized activated carbon. From this research, the effect of pH is significant on adsorption capacities of As (III) and As (V). The OAC-Fe, OAC-Mn gives more adsorption capacity of all types of arsenic species than that of AC-Fe, AC-Mn. OAC-Mn a...
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Investigation and ecological risk assessment of pb, as and hg in sediment of Tam Giang-Cau hai lagoon, Thua Thien Hue province - Duong Van HieuContamination of heavy metals in the sediment is an important problem for the lagoons. Basing on the investigation results from Sam Chuon lagoon, concentration of heavy metals was met the criteria standard of Viet Nam for the sediment, except for Hg at some stations. However, calculation of risk indices showed that Sam Chuon lagoon are polluted ...
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Study of copper removal in water by ion exchange material - Pham Thi Hang HaiFTIR spectrum showed that PS and PSW after being modified by H2SO4 contained –SO3H functional group, and the appearance of –SO3H in PSW is more remarkable comparing to PS. PSW-S, shows a much higher adsorption efficiency of Cu (II) comparing to PS-S (74.13 and 9.61% respectively). The set of optimal conditions for the 8 mm-diameter ion exchange ...
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Phosphate removal from aqueous solution by using modified sludge from water treatment plant - Dang Thi Thanh LocSludge modified by humic acid (in a weight ratio of 10:1) and heated at 600 °C showed a great chemically and physically activated adsorbent. SEM image indicated that the porous structural aspects of the MS suitable for removing P from aqueous solution. The optimum adsorption conditions for the adsorption of MS are 10 mg/L initial P concentration...
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