Repeated additions of untreated slurry to soil affected ecology and caused high levels of heavy metal in soil and ground water. The objective of this study was to evaluate heavy metal from hanwoo slurry with ferrous sulfate (FeSO4·7H2O), aluminum sulfate [Al2(SO4)3·14H2O, alum] and aluminum chloride (AlCl3·6H2O) as a way to improve environmental management in hanwoo industry. The treatment rates, which were incorporated totally within the hanwoo slurry, were 1.0 g and 1.5 g of ferrous sulfate, alum and aluminum chloride/25 g of hanwoo slurry. The various rates of chemical additives significantly increased dry matter (9.98~13.94%) and decreased pH (3.48~6.52) compared with the controls. The use of chemical additives decreased Fe (11~29%), Al (7~12%), Zn (13~36%), and Cu (4~32%) contents, except for Fe in hanwoo slurry with ferrous sulfate and Al in hanwoo slurry with alum and aluminum chloride. In addition, the reduction in heavy metal should be associated with reduction in pH.
In conclusion, the results of this study suggest that alum and aluminum chloride additives at rate of 1.5 g were cost-effective management practice that significantly reduces heavy metal from hanwoo slurry, while it may be improved environmental management.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험 준비 및 시료 채취
  2.2. 화학제재첨가
  2.3. 한우 액상분뇨의 중금속 분석 방법
  2.4. 통계처리
 3. 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 김창만(진생유기농(주) 중부대학교, 경북대학교 산업동물의학연구소) | Chang Mann Kim (Ginseng & Organic Co., Ltd 407, Industry Academy Cooperation, Joongbu University, Research Institute for industrial animal medicine, Kyungpook National University)
• 최인학(진생유기농(주) 중부대학교, 경북대학교 산업동물의학연구소) | In Hag Choi (Ginseng & Organic Co., Ltd 407, Industry Academy Cooperation, Joongbu University, Research Institute for industrial animal medicine, Kyungpook National University) Corresponding Author
• 최정훈(한양대학교 화학과) | Jung Hoon Choi (Department of Chemistry, Hanyang University)
• 고수현(경북대학교 토목공학과) | Soo Hyun Ko (Department of Civil Engineering, Kyungpook National University)