Analysis of surface layers of hot – forging dies of skd61 steel fabricated by die – sinking electrical discharge machining using copper and titanium electrodes - Nguyen Huu PhanThe white layer had a low hardness and significant cracking that is detrimental for the forging die functionality. Thus, it is necessary to determine the effect of various parameters in order to reduce or eliminate the white layer formation on the machined surface. The thickness of the surface in polishing (≈ 50 μm) is not reasonable. This has r...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1004 | Lượt tải: 0
Adsorption of uranium from aqueous solution by cu0.5ni0.5fe2o4 – reduced graphene oxide nanocomposites - Tran Quang DatCNF - rGO nanocomposites have been successfully prepared by the two-steps methods. The CNF - rGO materials could be recovered readily from aqueous solution by magnetic separation. The equilibrium data were well fitted by the Langmuir adsorption isotherm model, and CNF - rGO exhibited high absorbability for U(VI). The maximum adsorption capacity ...
10 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 607 | Lượt tải: 0
A study for synthesis of dicalcium phosphate from various grades of phosphatic materials - Bui Quoc HuyDicanxi photphat khan cấu trúc monetit góp phần quan trọng trong việc hình thành cấu trúc của xương và răng. Hợp chất này có thể tái tạo những mô cứng do chúng có độ hòa tan cao, dễ được cơ thể hấp thụ hơn so với các hợp chất canxi photphat khác. Dicanxi photphat có thể được sử dụng làm thực phẩm chức năng cung cấp canxi và photphat cho con ngườ...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 613 | Lượt tải: 0
A response surface methodology approach for the optimization of cu2+ removal using rice husk– derived activated carbon - Long Giang BachThe present study focused on the promising of the rice husk as a zero–costly and available precursor for the fabrication of porous activated carbon for the purposes of wastewater treatment. The characteristic profiles admitted the highly porous, amorphous, various kinds of essential functional groups and defective structure of rice husk–derived ...
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Treatment effectiveness evaluation of wastewater from industrial fried chicken re- Processing processes by advanced oxidation processes - Nguyen Dien ChauThe study showed that the COD removal efficiency of ozone agents is not high at any pH value for the oxidation with ozone. Therefore it was required supporting factors to improve processing performance. This research selected the electrolysis process as the support for the process to minimize the use of chemicals to avoid affecting the biologica...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 579 | Lượt tải: 0
Assessing metal pollution in groundwater at pleistocene aquifer in Go Vap district, Ho Chi Minh city - Tran Thi Phi OanhFrom the research results, it could be clearly clarified that the distributed metals of natural origin were: total iron, Al3+, As5+ and metals of artificial origin were: Cu2+, Pb2+ and Zn2+. It could be seen that the metal was distributed mainly in the mid - upper Pleistocene aquifer (qp2- 3) from 20 meters to over 40 meters in the range of stro...
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Removal of ni2+ from aqueous solution by adsorption onto tea waste–derived activated carbon - Long Giang BachThe porous activated carbon fabricated from cheap and abundant tea waste source was found to be an effective adsorbent for removal of Ni2+ ions from aqueous solution. The RSM involving CCD was successfully applied to assess the influence of independent parameters, including Ni2+ initial concentration, pH and AC dosage on the removal of Ni2+ and ...
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Integrated evaluation model for surface water quality a case study in Ho Chi Minh city, Vetnam - Thu Thi Minh NguyenThe water quality evaluation model was built based on the logic of fuzzy theory. Quality monitored data from a catchment area in a developing city has been applied for testing the results and compared to other regular method, Vietnam national water quality index. The results of the two methods show parallels and this in turn shows that fuzzy eva...
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Greenhouse gas emissions from anaerobic digestion plants - Nguyen Thanh PhongThe emission factors were transferred into CO2 equivalents according to IPCC (2007). The overall CO2 emissions were in a range from 31 to 435 kg (Mg biowaste)-1. The CH4 emissions from AD plants were more important than the emissions from N2O and NH3 (Figure 5A). The emissions of CH4 accounted from 36 - 92 % while the emission of N2O and NH3 con...
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Effect of organic loading rate on simultaneous removal of nitrogen and phosphorus from aquatic product processing wastewater by advanced a2/o – baf system - Nguyen Xuan Quynh NhuIn this study, the model of combined A2/O – BAF system was operated well and treatment efficiencies of nitrogen and phosphorus at four loading rates were very high. It was capable of achieving effluents with very low nitrogen and phosphorus concentrations from aquatic product processing wastewater. For a loading rate of 0.75 kgCOD/m3/day, treatm...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 586 | Lượt tải: 0
