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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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To understand the chemical structure of sewer sludge in comparison with commercial compost and charcoal used as a soil improver, it was carried out to analyse their ash contents and metal ions, and to elucidate the chemical structure of their residuals after a sequential treatment of alcohol-benzene(1:2) extraction in Soxhlet, 3% HCl reflux and 79% H₂SO₄ hydrolysis, using CHNS analyzer and solid C-13 NMR spectrometer.
The results obtained were as follows:
1. Ash content of sludge was about 46% that is higher than those of compost (17%) and charcoal (4%).
2. The residual of sludge after a sequential treatment of HCl and H₂SO₄ Hydrolyses had high ash content about 23%, too.
3. The sludge seems to be suitable to the soil improver because the content of heavy metal ions in sludge was near the compost and below the organic fertilizer standard.
4. Elemental composition of sludge residual after HCl-H₂SO₄ hydrolyes was C_(56)H_(91)O_(12)N_(2)S = (C_(6)H_(10)O_(5))₂(C_(6)H_(4))_7C_(2)H_(43)O_(2)N(2)S, similar to C_(103)H_(122)O_(33)N_(6)S = (C_(6)H_(10)O_(5))_6(C_(6)H_(4))_10C_(7)H_(22)O_(3)N_(6)S of compost.
5. The sludge residual had proved to have both considerable aliphatic and aromatic groups, but the compost residual to have mainly aliphatic groups and the charcoal to have mainly aromatic groups, through the peak analysis of solid C-13 NMR charts.
6. So, the sewer sludge is proved to have a considerable amount of aromaticity like in woody biomass containing lignin.
The results obtained were as follows:
1. Ash content of sludge was about 46% that is higher than those of compost (17%) and charcoal (4%).
2. The residual of sludge after a sequential treatment of HCl and H₂SO₄ Hydrolyses had high ash content about 23%, too.
3. The sludge seems to be suitable to the soil improver because the content of heavy metal ions in sludge was near the compost and below the organic fertilizer standard.
4. Elemental composition of sludge residual after HCl-H₂SO₄ hydrolyes was C_(56)H_(91)O_(12)N_(2)S = (C_(6)H_(10)O_(5))₂(C_(6)H_(4))_7C_(2)H_(43)O_(2)N(2)S, similar to C_(103)H_(122)O_(33)N_(6)S = (C_(6)H_(10)O_(5))_6(C_(6)H_(4))_10C_(7)H_(22)O_(3)N_(6)S of compost.
5. The sludge residual had proved to have both considerable aliphatic and aromatic groups, but the compost residual to have mainly aliphatic groups and the charcoal to have mainly aromatic groups, through the peak analysis of solid C-13 NMR charts.
6. So, the sewer sludge is proved to have a considerable amount of aromaticity like in woody biomass containing lignin.
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