The shorelines of Namhae coast in Korea is mostly not widely opened and geographically complicated and semi-blocked. Currently the civilization and industralization of these areas caused to significant environmental problems associated with accumulation of oil and other hazardous organic materials. ...
The shorelines of Namhae coast in Korea is mostly not widely opened and geographically complicated and semi-blocked. Currently the civilization and industralization of these areas caused to significant environmental problems associated with accumulation of oil and other hazardous organic materials. These contaminated sediments now appear to be the main source of toxic contaminants in many bays. Bottom sediments of aquatic systems become contaminated with toxic substances through a series of fate and transport processes acting on the contaminants introduced to the water column from external sources. To solve these problems, the industrialized countries are efforts to develop the high technologies such as bioremediation using microbial agents and oxidant agents to enhance the microbial environments. The First, in this work, in order to enhance the quality of the shoreline sediment we analyzed enviro-chemical it substances, TPHs and microbial growth after treating with oxygen releasing compound(ORC) such as MgO2. Total organic compound(TOC) was reduced from 33.45% to 25.1~31.08% meanwhile COD decreased from 27.5~28.9mg/g·dry to 19.9~26.1mg/g·dry for input of 2~10% MgO2 in 20days. For 10% MgO2 input, T-P and T-N were reduced by 32.0% and 53.2%, respectively. Most of all TPH was decomposed by max. 50.4% in 21days, and the total viable count of microbes exponentially increased by 66.6%. The Second, We investigated the changes in a contaminated bay sediment when some oxygen releasing compounds(ORC) were put in it was found that the ORCs such as MgO2, and CaO2, were good at suppression of H2S and removal of phosphorus by changing the neutral pH into weak alkaline pH. In particular, performance of CaO2 was the best of all probably because of the faster establishment in O2 generation and weak alkaline condition. Consequently, it was concluded that ORCs instead of sea cultivation or red clay spreading would promote the conditions better in which O2 should kept being generated and active microbial population for bioremediation should be maximized. The Third, We studied the release characteristics of the marine sediment which facilitates sea eutrophication through some lab-scale simulation experiments. Environmental indicators such as pH, ORP(oxidation reduction potential), nitrogen compounds, and phosphates were measured in order to calculate the corresponding release rates. CaO2, an oxygen releasing compound was used to determine how it would effect on the natural process of sedimental release. The Fourth, This study was carried out in order to observe how the bay sediment would be changed with microbial treatments and a chemical oxidant like CaO2. With CaO2 treatment, pH was kept over 9.66 and ORP ranged from +4.70~+46.0, which meant an aerobic state meanwhile with the microbial treatment those were worse. In addition the chemical treatment showed better environmental index values than the microbial one: volatile organics content and COD values in the former were 12.9% and 37.9% while those in the latter were 4.5% and 18.7%, respectively. AVS and T-P were 71.1% and 100% versus 56.5% and 85.8%, respectively. However, the microbial treatment was better for T-N(66% higher). On the other hand, both treatment at a time enhanced all the environmental indices but COD meantime pH and ORP values were lower than with the chemical treatment only. Thus additional input of an oxygen generator like CaO2 could improve the environmental state of a bay sediment where the biological treatment is going on. The objective of this study was to test the effectiveness of ORC and microbial agents on marine sediment contained oil and organics. This research was studied also to confirm the feasibility on the bioremediation for the combination treatment of both, investigating the chemicals quality and microbail community structure of sediments.
The shorelines of Namhae coast in Korea is mostly not widely opened and geographically complicated and semi-blocked. Currently the civilization and industralization of these areas caused to significant environmental problems associated with accumulation of oil and other hazardous organic materials. These contaminated sediments now appear to be the main source of toxic contaminants in many bays. Bottom sediments of aquatic systems become contaminated with toxic substances through a series of fate and transport processes acting on the contaminants introduced to the water column from external sources. To solve these problems, the industrialized countries are efforts to develop the high technologies such as bioremediation using microbial agents and oxidant agents to enhance the microbial environments. The First, in this work, in order to enhance the quality of the shoreline sediment we analyzed enviro-chemical it substances, TPHs and microbial growth after treating with oxygen releasing compound(ORC) such as MgO2. Total organic compound(TOC) was reduced from 33.45% to 25.1~31.08% meanwhile COD decreased from 27.5~28.9mg/g·dry to 19.9~26.1mg/g·dry for input of 2~10% MgO2 in 20days. For 10% MgO2 input, T-P and T-N were reduced by 32.0% and 53.2%, respectively. Most of all TPH was decomposed by max. 50.4% in 21days, and the total viable count of microbes exponentially increased by 66.6%. The Second, We investigated the changes in a contaminated bay sediment when some oxygen releasing compounds(ORC) were put in it was found that the ORCs such as MgO2, and CaO2, were good at suppression of H2S and removal of phosphorus by changing the neutral pH into weak alkaline pH. In particular, performance of CaO2 was the best of all probably because of the faster establishment in O2 generation and weak alkaline condition. Consequently, it was concluded that ORCs instead of sea cultivation or red clay spreading would promote the conditions better in which O2 should kept being generated and active microbial population for bioremediation should be maximized. The Third, We studied the release characteristics of the marine sediment which facilitates sea eutrophication through some lab-scale simulation experiments. Environmental indicators such as pH, ORP(oxidation reduction potential), nitrogen compounds, and phosphates were measured in order to calculate the corresponding release rates. CaO2, an oxygen releasing compound was used to determine how it would effect on the natural process of sedimental release. The Fourth, This study was carried out in order to observe how the bay sediment would be changed with microbial treatments and a chemical oxidant like CaO2. With CaO2 treatment, pH was kept over 9.66 and ORP ranged from +4.70~+46.0, which meant an aerobic state meanwhile with the microbial treatment those were worse. In addition the chemical treatment showed better environmental index values than the microbial one: volatile organics content and COD values in the former were 12.9% and 37.9% while those in the latter were 4.5% and 18.7%, respectively. AVS and T-P were 71.1% and 100% versus 56.5% and 85.8%, respectively. However, the microbial treatment was better for T-N(66% higher). On the other hand, both treatment at a time enhanced all the environmental indices but COD meantime pH and ORP values were lower than with the chemical treatment only. Thus additional input of an oxygen generator like CaO2 could improve the environmental state of a bay sediment where the biological treatment is going on. The objective of this study was to test the effectiveness of ORC and microbial agents on marine sediment contained oil and organics. This research was studied also to confirm the feasibility on the bioremediation for the combination treatment of both, investigating the chemicals quality and microbail community structure of sediments.
주제어
#Oxygen release compounds Microbial agent CaO2 PCR-DGGE 미생물제제 산화제 환경변화
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