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자연정화공법에 의한 생활하수중 오염물질의 존재형태별 처리 : 李炳周 [저] 원문보기

  • 저자

    이병주

  • 학위수여기관

    경상대학교

  • 학위구분

    국내석사

  • 학과

    응용생물과학부

  • 지도교수

  • 발행년도

    2004

  • 총페이지

    viii, 87장

  • 키워드

    자연정화공법 오염물질 존재형태 처리;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10060177&outLink=K  

  • 초록

    To reduce the area of a sewage treatment plant, increase the removals of water pollutant and attain the goal of water quality for the total amount control of pollutant, a sewage treatment plant, using natural purification, was constructed. The constructed wetland was composed of an aerobic area and an anaerobic area. The efficiency of sewage treatment according to the treatment time, the loading amount of pollutant, season and decomposition velocity of pollutant was investigated. Nitrification and denitrification rate by water pollutants and adsorption characteristics and an existence of water pollutant of pebbles were investigated, too. And then, water pollutant balances to know the tendency of the sewage treatment according to the treatment time on the basis of above results were analogized. The results were as follows ; On the effects of the treatment time in constructed wetland for 2 years, the removal amount of BOD, COD, TOC and SS in the aerobic area was rapidly increased as treatment proceeded. Decreased BOD, COD and T-P were mostly insoluble, while decreased TOC and T-N were mostly soluble and decreased SS was mostly volatile. The removal amount of BOD and COD decreased, but that of TOC, T-N and T-P was increased in the anaerobic area as the treatment time proceeded. On the effects of pollutant loading, the amount according to the existence of water pollutant, between the removal amount of BOD and loading amount of BOD was positive correlation, and the removal amount of IBOD was more than that of SBOD. The BOD treatment tendency in the aerobic area was similar to that in anaerobic area, and treatment tendency of COD was similar to that of BOD. But in the case of TOC, the removal amount of STOC was more than that of ITOC, contrary to that of BOD or COD. In the case of SS, the removal amount of VSS was more than that of FSS as the loading amount of SS was increased. In the case of T-N and T-P, the removal amount of dissolved materials was more than that of suspended materials. On the effects of season according to the an existence of water pollutant, the removal amount of BOD, COD, TOC, SS, T-N and T-P in summer and autumn was more than that in spring and winter. The removal of BOD, COD, TOC, SS, T-N and T-P in effluent was about 92, 89, 73, 95, 46 and 84% in all seasons, respectively. Decomposition velocity of water pollutant according to the an existence of water pollutant was as follows ; In the case of BOD, the decomposition velocity constants of SBOD and IBOD in aerobic area were 3.46 and 1.50day^(-1). In anaerobic area that were 0.26 and 0.16day^(-1), respectively. The decomposition velocity of SBOD in both areas was speedier than that of IBOD. The decomposition velocity of COD, according to the an existence of water pollutant, was little different. In the case of TOC, the decomposition velocity of STOC in aerobic area was speedier than that of ITOC. But that in anaerobic area was opposite in comparison to that in aerobic area. In the case of SS, the decomposition velocity of VSS in both areas was speedier than that of FSS. In the case of T-N, the decomposition velocity of DTN and STN in aerobic area was 0.52 and 0.59day^(-1), and that in anaerobic area was 0.08 and 0.05day^(-1), respectively. The nitrification rate in aerobic area was about 80% at HRT 1.1day and nitrification velocity constant was about 1.5day^(-1). The denitrification rate in anaerobic area was about 80% at HRT 5.5day and denitrification velocity constant was about 0.5day^(-1). In the case of T-P, the decomposition velocity constant of DTP and STP in aerobic areas was 1.59 and 0.46day^(-1), and that in anaerobic area was 0.24 and 0.06day^(-1), respectively. To study the physico-chemical characteristics of pebbles which were used in the constructed wetland by natural purification, the fractionation of nitrogen and phosphorus, the content of inorganic matters and heavy metals in pebbles, according to the sewage treatment time, were investigated. The results were as follows ; T-N concentration in pebbles was gradually increased, but organic-N concentration was rapidly increased as the treatment proceeded. And the concentration of NH_(4)-N and NO_(2)-N was slightly increased as the treatment continued. T-P concentration also slightly increased in time. The concentration of inorganic-P and organic-P was rapidly increased as the treatment time went by. In the surface layer of the aerobic area after 2 years levels were 82.9 and 93.9mg/㎏. Among phosphorus fractionation, Ca-P concentration was higher than any other phosphorus. The relative concentration of inorganic matters in surface of pebbles by EDS, after 2 years, was that Si concentration rapidly decreased in comparison to raw pebbles, while the concentration of Al, Ca and Fe slightly increased. Water pollutant balance was analogized to know treatment tendency according to the treatment time by an existence of water pollutant. 9.9㎥/day on the average for 1 year flowed into the constructed wetland and about 14% of inflow was evapotranspired. In the case of BOD balance, the inflow of SBOD and IBOD was 81∼98 and 256∼323㎏/day, respectively. About 86∼93% of SBOD and 71∼92% of IBOD in the aerobic area was treated. And 3.3∼3.8% of SBOD and 6.9∼18.7% of IBOD in anaerobic area were treated. So the outflow of SBOD and IBOD was about 3.7∼8.4 and 3.0∼26㎏/year. In the case of COD balance, the inflow of SCOD and ICOD was 42∼85 and 122∼198㎏/day, respectively. About 68∼75% of SCOD and 73∼96% of ICOD in aerobic area were treated. And 11∼16% of SCOD and 2.9∼14% of ICOD in the anaerobic area were treated. So the outflow of SCOD and ICOD was about 6.6∼12 and 3.1∼16㎏/year. In the case of TOC balance, the inflow of STOC and ITOC was 92∼148 and 29∼63㎏/day, respectively. About 54∼58% of STOC and 68∼97% of ITOC in the aerobic area were treated. And 11∼22% of STOC and 0.3∼10% of ITOC in the anaerobic area were treated. So the inflow of STOC and ITOC was about 29∼36 and 6.4∼14㎏/year. In the case of the SS balance, the inflow of VSS and FSS was 102∼159 and 87∼90㎏/day, respectively. About 89∼94% of VSS and 90∼91% of FSS in aerobic area were treated. And 5.1∼8.2% of VSS and 7.1∼7.9% of FSS in the anaerobic area was treated. So the outflow of VSS and FSS was about 2.3∼2.4 and 1.5㎏/year. In the case of T-N balance, the inflow of DTN and STN was 157∼252 and 57∼59㎏/day, respectively. About 14∼22% of DTN and 23∼29% of STN in the aerobic area by pebbles were treated. And 41∼42% of DTN and 39∼46% of STN in the aerobic area by microorganisms were treated. About 3.3∼3.8% of DTN and 8.3∼13% of STN in the aerobic area by pebbles were treated. And 7.1∼10% of DTN and 1.8∼3.5% of STN in the aerobic area by microorganisms were treated. So the outflow of DTN and STN was about 41∼79 and 1.8∼3.5㎏/year. In the case of T-P balance, the inflow of DTP and STP was 7.8∼13 and 1.8∼4.2㎏/day, respectively. About 24∼27% of DTP and 33∼39% of STP in the aerobic area by pebbles were treated. And 13∼15% of DTP and 17∼22% of STP in the aerobic area by microorganisms were treated. About 23∼24% of DTP and 17∼31% of STP in the aerobic area by pebbles were treated. And 7.1∼7.3% of DTP and 5.6∼6.3% of STP in the aerobic area by microorganisms were treated. So the inflow of DTP and STP was about 2.1∼4.3 and below 0.5㎏/year.


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