A Study on the Effects of Retardation with Pb in the Biofilter

생물여과층에 의한 납의 이동억제효과에 관한 연구

The purpose of this study was to show the application of the Biofilter for treatment of the soil contaminated by lead and to investigates the effect of the biofilter on the retardation of lead with pilotplants that were simulated with different media and the number of bed. and to testify the inoculation by seeding microbes. The ratio of the degradation of soil contaminant was verified as CODcr/TOC in order to find a variation of the stabilization index in soil. The Biofiltration was one of biological processing methods for treatment. The contaminants were transported through the biofilter that was filled with the media. The surface of media formed biofilm which was surrounded by microbes and through its boundary, some materials were exchanged and migrated into the cell of microbes in an orderly manner. To investigate the effect of the Biofiltration, contaminated soil with lead nitrate of 1000mg/kg in dry was made artificially. The tests were simulated such as compost, Bioceramic and compost with bioceramic by 7:3 in weight. The bed consisted of three layers in order to find effect of the number of bed. Aspergillus niger was used as a biosorbent could probe the effect on the retardation of lead.

본 연구는 Pb으로 오염된 토양을 Biofilter에 의한 적용가능성을 판단하고 충전물질, bed수 그리고 미생물 접종에 따른 Pb의 이동억제효과의 변화를 Pilot plants의 실험을 하였으며 토양의 분해정도를 CODcr/TOC ratio로써 안정화 지표에 대한 변화를 검토하였다. 생물여과는 오염된 물질을 생물여과상를 통과시켜 충전물질표면에 부착되어있는 생물막의 각종미생물들에 의한 경계면을 통하여 물질의 상호교환 및 전환이 생기며 생물막내에 흡수된 물질을 생물학적으로 처리하는 방법의 일종이다. 본 연구는 오염된 토양에 lead nitrate를 첨가시켜 납을 1,000㎎/kg dry soil로 인공적으로 조제한후 충전물질로는 퇴비, 바이오세라믹 그리고 퇴비와 바이오세라믹을 중량비로 7:3으로 하였고, 1단, 2단, 3단으로 하고 이에따라 생물흡착제로 'Aspergillus niger'를 이용하며 납의 이동억제효과의 변화를 검토하였다.