Abstract
In this study it was focused that if the chrome could be removed in the shaving dust, the reusable protein resource could be recycled from the shaving dust. As the chrome forms a Cr-collagenate by cross linking of collagen in the shaving dust, the dust was steeped for swelling and plumping by $Ca(OH)_2$ solution and then chromium in dust was resolved out by $H_2SO_4$ solution in the first stage process. In the second stage one, dust was swelled and plumped by NaOH solution and then the chromium in dust was oxygenated to a hexavalent chrome, which has high solubility in $H_2O_2$ solution. And then the chromium was removed byt he steeping of $H_2SO_4$ solution as the last process. The first stage process was consisted of the sequential steeping of 3%-$Ca(OH)_2$ and $0.8%-H_2SO_4$. In the second stage the total chrome was effectively removed by the sequential steeping of 0.1%-NaOH, $3%-H_2O_2$ and $1%-H_2SO_4$. In the completely dechromated dust, the humidity was measured as 10.68% and the crude protein was contained by 79.81%. Steeping solutions were reused 3 times for chrome removal process, the chrome was entirely removed in shaving dust.
본 연구에서는 피혁분에서 크롬을 제거하여 여러 면으로 활용 가능한 단백질자원을 얻고자 하였다. 피혁분은 크롬이 콜라겐사이에 가교결합을 하여 크롬-콜라겐염(Cr-collagenate)을 형성하므로 1단계 공정에서 $Ca(OH)_2$용액에 침지(steeping)하여 팽윤(swelling)-팽창(plumping)시켜, $H_2SO_4$용액으로 크롬을 용출시켰다. 2단계 공정에서 NaOH용액으로 팽윤-팽창시키고 $H_2O_2$용액으로 용해도가 큰 Cr(VI)으로 산화하여 $H_2SO_4$용액으로 용출시켜 탈 크롬을 마무리하였다. 1단계 공정에서 $3%-Ca(OH)_2$용액, $0.8%-H_2SO_4$용액으로 2단계 공정에서 0.1%-NaOH용액, $3%-H_2O_2$용액, $1%-H_2SO_4$용액으로 순차적으로 침지하여 효율적으로 완전 탈 크롬을 할 수 있었다. 완전 탈 크롬된 피혁분에는 수분 10.68%일 경우, 조 단백질이 79.81% 함유하였으며, 각 공정의 침지용액들은 3회까지 반복 사용하여도 완전히 크롬을 제거할 수 있었다.