This study was carried out to investigate the formaldehyde (FA) filtration pattern of additional media for indoor biofilter system. Dry pellet type activated carbon (PAC), activated clay (ACL), zeolite, diatomite, pumice and loess ceramic ball were tested. In the case of dry filter media, formaldehyde purification efficiency was the most excellent with activated clay and then was good with the activated carbon, diatomite, zeolite, and pumice order. PAC and ACL decreased the FA concentration with exponential pattern resulted from dynamic balance between emission and purification. Zeolite, diatomite, pumice, and loess ceramic ball showed high filtration rate at initial time and then increased FA concentration result from breakthrough. PAC, zeolite and diatomite could be recommended as additional filter media for biofilter system considering FA filtration and breakthrough characteristics. FA filtration and breakthrough characteristics were improved with wet media except PAC and ACL. In particular, purification performance improvement and breakthrough mitigation were higher in pumice and loess ceramic balls. PAC+ZEO mixing showed the most high purification performance and breakthrough mitigation in all mixing methods. Thus mixture of PAC with zeolite and vertical mixing could be recommended as additional filter media to improve the FA purification ability and pressure drop with indoor air biofilter system.

Ⅰ. 서론
 Ⅱ. 연구방법
  1. 사무실 mock-up 및 바이오필터 순환 시스템
  2. 첨가배지 종류 및 처리
  3. 측정항목
 Ⅲ. 결과
  1. 첨가배지의 수분함유에 따른 정화특성
  2. 첨가배지의 혼합에 따른 정화특성
 Ⅳ. 고찰
 Ⅴ. 적요
 V. References

• 정현환(국립원예특작과학원 도시농업과) | Hyun Hwan Jung
• 유은하(국립원예특작과학원 도시농업과) | Eun Ha Yoo
• 장혜숙(국립원예특작과학원 도시농업과) | Hye Sook Jang
• 김광진(국립원예특작과학원 도시농업과) | Kwang Jin Kim Corresponding author