Conference Proceedings - 2021

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Browsing Conference Proceedings - 2021 by Subject ""Ecology"
  • Publication
    Generation rates of bottom and fly ash from thermal generation facilities in industrial and export processing zones in Ho Chi Minh City, Vietnam
    ( 2021)
    T. T. Hien Ho
    ;
    T. Thanh Lam
    ;
    N. Q. Thinh Le
    ;
    T. K. Oanh Le
    The use of thermal generation facilities (TGFs) in manufacturing industries produces of a massive amount of bottom and fly ash (BFA) containing toxins, thus requiring proper management. In Ho Chi Minh city, more than 200 TGFs are in operation but the generation BFA and how it is handled is unknown, posing environmental and health risks if contaminants in BFA are leaching into the environment and accumulated in food webs. This study investigated the fuel demands of and the BFA generation from the TGFs in 17 industrial zones and export processing zones in Ho Chi Minh city to estimate BFA generation rates for various fuels. The results revealed a total consumption of 129,028 tons of diverse fuels per month, among which diesel oil (DO) and coal were of majority, accounting for 85,65% and 9,11% by weight, respectively. In addition to coal and DO, cashew husk, wood, and sawdust were among the most widely used fuels. BFA generation rates for rice husk, coal, sawdust, firewood, and cashew husk were 16.95 ± 28.12%, 10.62 ± 8.84%, 5.57 ± 7.34%, 4.88 ± 3.59% and 0.93 ± 1.37%, respectively. Automatically fuel feeding and small – medium TGFs showed higher BFA generation rates than manually fuel feeding and large ones. The findings help estimate the amount of BFA from MFs on larger scales, such as city, province, and country, which serves to develop an effective management strategy and plan
  • Publication
    Presence and potential for isolation of potassium solubilizing bacteria in mango, pitaya, and banana rhizospheric soils
    ( 2021)
    Xuyen Thi Vo
    ;
    Nguyen Quang Dang
    ;
    Danh Cong Vu
    ;
    Nhut Nhu Nguyen
    Potassium solubilizing bacteria (KSB) are an important group in the soil ecosystem and have multiple growth- promoting activities for plants. The aim of the study is to evaluate the relationship of the total count of KSB with several biochemical parameters in banana, dragon fruit, and mango rhizospheric soils as well as potential for isolation of indigenous KSB strains with high K soluble activity. The results have showed that KSB are commonly present in soil samples. In the correlations with the total KSB, the total aerobic bacteria had the greatest impact followed by the total fungi, % P, pH, moisture, % N, % K, and % organic carbon, respectively. Of these, pH, moisture, % N, % K, and % organic carbon positively correlates with the total KSB. Conversely, the total aerobic bacteria, total fungi, and % P content have negative correlations. The K solubility analysis on agar plates has indicated a potential to collect highly active clones do not depend on the soil samples from these above plants. This research has shown the potential to detect and isolate hight activity indigenous KSB for development of KSB microbial fertilizers in the future