All Issue

2016 Vol.53, Issue 4

Research Paper

31 August 2016. pp. 309-320
Abstract
Applicability of kaolin as a substitute of yellow clay, which is used in removal of green algal bloom,was investigated. Soil texture, CEC, particle distribution, and zeta potential of kaolin appeared similar to thoseof yellow clay. Yellow clay contained higher concentrations of P2O5 and some heavy metals than kaolin does.Spray experiments were conducted for natural algae using both materials with particle size of 0.18~2 mm and<0.18 mm. The concentrations of chlorophyll-a and nutritive salts were monitored at 0, 20, and 60 minutes. While0.18~2 mm yellow clay showed the highest chlorophyll-a removal efficiency when yellow clay was sprayed at10 g/L injection rate for 60 minutes, kaolin yielded a faster removal with the lower injection rate. Kaolin showedthe higher efficiency than yellow clay did in removal of total phosphorous and nitrogen at 0.5, 2.5, and 5 g/Lspraying. The results indicated the prospective applicability of kaolin in practical removal of algal bloom in streamsand lakes.
국내에서 발생하는 녹조현상을 제어하기 위해 사용되고 있는 황토의 대체 물질로써 국내 고령토의적용 가능성을 평가하였다. 고령토와 황토의 토성, 양이온교환능력, 입도분포, 제타포텐셜은 유사하게 나타났다.황토의 경우 녹조의 영양분으로 작용 가능한 P2O5 및 아연, 납, 크롬이 고령토에 비해 높게 검출되었다. 영산강에서 발생한 자연 녹조를 대상으로 하여 고령토 및 황토를 0.18~2 mm 및 <0.18 mm로 입도를 구분하여 각각0.5, 2.5, 5, 10 g/L를 살포한 후 0, 20, 60분간 반응시키며 클로로필-a 및 영양염류 제거 실험을 수행하였다.0.18~2 mm 입도의 황토는 10 g/L의 살포량과 60분의 반응 시간에서 높은 제거 효율이 나타났으나, 고령토는적은 양으로도 즉각적인 제거 효과를 보였다. <0.18 mm 황토는 고령토에 비하여 녹조 제거효과가 높았다. 황토의 경우 10 g/L 살포 시에는 영양염류 제거효율이 좋았으나, 소량 살포하였을 경우 고령토는 황토보다 월등히높은 총인 및 총질소 제거효율을 보였다. 이러한 결과는 황토 대체재로서 고령토의 활용 가능성을 지시하는것으로 보인다.
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 53
  • No :4
  • Pages :309-320