Levels of selected indoor air pollutants in three Ha Noi offices - Bich Thuy LyLevels of indoor PM10 in several offices in Ha Noi were observed with the concentrations in the wet season and dry season being 3.5-25.1 (mean = 13.3) µg/m3 and 3.7-24.7 (mean = 11.2) µg/m3, respectively. The indoor PM10 concentrations were lower than daily level of WHO guidelines of 50 µg/m3. Variations of PM10 concentration with different fact...
9 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 543 | Lượt tải: 0
Co-Degestion of food waste and domestic wastewater by using upflow anaerobic sludge blanket (uasb) couped with a microfiltration membrane (mf)Co-digestion of domestic wastewater and food waste by AnMBR technology was found to be feasible in tCOD, TSS removal and improved biogas recovery efficiency. The results indicated that tCOD, TSS removal efficiencies reached nearly 90 % for tCOD and more than 90 % for TSS due to presence of membrane module. The tCOD, TSS removal efficiencies did ...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 739 | Lượt tải: 0
Application of machine learning to fill in the missing monitoring data of air qualityThree machine learning models were used to predict the missing values of monitoring data of air quality for Gia Lam, Hanoi and Nha Trang, Khanh Hoa stations. Extensive experimental results indicated that the effectiveness of the three studied machine learning models, namely ARMA, ANN and SVR is better than that of traditional approaches such as ...
7 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 624 | Lượt tải: 0
Human health risk implication from cadmium and lead contamination at lead-Zinc mine area, northern Viet NamSoils and plants around Cho Dien lead/zinc mine area have been contaminated by mining activities. Elevated concentrations of Cd and Pb were also found in surface soils near the mining site, with mean values of 24.5 and 13,423 mg/kg, respectively. Soils from uncultivated and cultivated sites contained higher lead and cadmium concentrations than Q...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 556 | Lượt tải: 0
The study on optimization of copper leaching from waste pcbs by using response surface methodologyThe present study has successfully built the model, by response surface methodology, using Design Expert software, which is compatible with the experimental data, provided a high correlation coefficient (R2). The optimal conditions were identified as Fe2(SO4)3 concentration of 0.35 M, volume of H2O2 addition at 10 ml and leaching time of 10 h. L...
7 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 553 | Lượt tải: 0
Calculation of environmental properties for organic compounds using quantitative structuresolubility relationshipsThis study has successfully constructed QSSR linear models with the support of genetic algorithms. This technique can allow to construct the linear regression models for large data sets. The genetic algorithm allows to select the important parameter in model. The QSSR linear models is obtained to satisfy the evaluated statistics. In addition, th...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 531 | Lượt tải: 0
Human health hazard of polycyclic aromatic hydrocarbon in road dust in Ha Noi metropolisPolycyclic aromatic hydrocarbons are pervasive in the road dust of Hanoi metropolis. The road dust samples were classified into slightly contaminated by PAHs for overall sampling sites according to Maliszewska-KordyBach (1996). However, there was stringent different contamination level among sites including roundabout, highway, bus station and r...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 490 | Lượt tải: 0
Characteristics of soil acidification of haplic Acrisols on ancient alluvial deposits under intensive cassava cultivation in Chau Thanh district, Tay Ninh provinceThe haplic Acrisols on ancient alluvial deposit under intensive cassava cultivation in the study area were acidic. Al saturation level was high whereas the exchange alkali and alkaline earth cations (Ca, Mg, K) were very low. This was one of the major factors to limit cassava growth and yield. If the cassava cultivation is expanded and the hi...
9 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 651 | Lượt tải: 0
The determination of driving characteristics of Hanoi bus system and their impacts on the emissionTypical parameters of the driving behavior of the five bus routes in Hanoi are determined. It is found that four parameters that have the highest impact on EFrunning are V1, V2, PCr, and Pc, of which, the average running speed (V2) is the most important one. This study also reconfirm that the real-world driving characteristics strongly impact on...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 518 | Lượt tải: 0
Tải lượng chất ô nhiễm đưa vào vịnh Đà NẵngCác nguồn nước thải ở các quận, huyện ở thành phố Đà Nẵng hàng năm trực tiếp vào vịnh khoảng 40 nghìn tấn COD; 22 nghìn tấn BOD5; 8 nghìn tấn T_N; 3 nghìn tấn T_P; 133 nghìn tấn TSS; 196 tấn NO3+NO2; 2 nghìn tấn NH4; 749 tấn PO4. Lượng phát thải cao ở các thông số COD, BOD5 và TSS. Nguồn sinh hoạt, chăn nuôi và nước chảy tràn là các nguồn c...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 642 | Lượt tải: 0
