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char = C;code = 67
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result sql = Evaluation of hexavalent chromium removal in a continuous biological filter with the use of central composite design (CCD).
Evaluation of hexavalent chromium removal in a continuous biological filter with the use of central composite design (CCD).
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char = ;code = 32
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char = s;code = 115
char = ;code = 32
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char = e;code = 101
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char = b;code = 98
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char = d;code = 100
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char = y;code = 121
char = ;code = 32
char = c;code = 99
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char = r;code = 114
char = v;code = 118
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char = p;code = 112
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char = s;code = 115
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
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char = ;code = 32
char = o;code = 111
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char = t;code = 116
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char = a;code = 97
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char = b;code = 98
char = e;code = 101
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = i;code = 105
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = 3;code = 51
char = .;code = 46
char = 9;code = 57
char = 4;code = 52
char = ;code = 32
char = m;code = 109
char = g;code = 103
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char = L;code = 76
char = ;code = 32
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char = C;code = 67
char = r;code = 114
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char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = p;code = 112
char = H;code = 72
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
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char = .;code = 46
char = 2;code = 50
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char = ;code = 32
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char = e;code = 101
char = ;code = 32
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char = e;code = 101
char = m;code = 109
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char = ;code = 32
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char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
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char = e;code = 101
char = x;code = 120
char = a;code = 97
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char = a;code = 97
char = l;code = 108
char = e;code = 101
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char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
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char = m;code = 109
char = i;code = 105
char = u;code = 117
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char = t;code = 116
char = i;code = 105
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char = e;code = 101
char = s;code = 115
char = c;code = 99
char = r;code = 114
char = i;code = 105
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char = i;code = 105
char = c;code = 99
char = h;code = 104
char = a;code = 97
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char = l;code = 108
char = i;code = 105
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char = e;code = 101
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = ;code = 32
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char = i;code = 105
char = n;code = 110
char = e;code = 101
char = t;code = 116
char = i;code = 105
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char = m;code = 109
char = o;code = 111
char = d;code = 100
char = e;code = 101
char = l;code = 108
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char = ;code = 32
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char = i;code = 105
char = s;code = 115
char = ;code = 32
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char = e;code = 101
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char = ;code = 32
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char = p;code = 112
char = p;code = 112
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char = p;code = 112
char = r;code = 114
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char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = r;code = 114
char = e;code = 101
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
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char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = v;code = 118
char = a;code = 97
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char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = ;code = 32
char = a;code = 97
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
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char = .;code = 46
char = <;code = 60
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char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = Hexavalent chromium is frequently found in industrial effluents as a result of the industrial applications of this compound and its anti-corrosive features. However, hexavalent chromium is extremely toxic, and its discharge in water is regulated, with a maximum limit of 0.1 mg/L in accordance with legislation established by CONAMA-Brazil (no. 397, April 3, 2008). To achieve lower discharge values, it is necessary to reduce from Cr(VI) to Cr(III), which is less toxic, and an economic alternative involves biological removal of this compound. Residence time distributions (RTDs) were measured to evaluate the behavior of actual biofilter operation conditions in a biofilter flow. The medium residence time distributions used were 8 and 24 h (recommended by the legislation). To optimize this process, a central composite design was used, considering the initial chromium concentration and pH as the independent variables and the removal of hexavalent chromium as the response. The boundary curves and surface response showed optimal behavior at 3.94 mg/L [Cr(0)] and a pH of 6.2. The removal process of hexavalent chromium is mathematically described by the Michaelis-Menten kinetic model. This model appropriately represents the variation of chromium concentration along the bioreactor.

Publication: J. Environ. Manage. 2011 Apr ;92(4)::1165-73. :doi: 10.1016/j.jenvman.2010.11.022.
Publication Date: 2011 Apr
Study Author(s): Dalcin, Maurielem Guterres;Pirete, Marcelo Melo;Lemos, Diego Andrade;Ribeiro, Eloizio Júlio;Cardoso, Vicelma Luiz;de Resende, Miriam Maria;
Institution: Faculty of Chemical Engineering, Uberlândia Federal University, P.O. Box 593, Av. João Naves de Ávila, 2121, Campus Santa Mônica, Bloco 1K 38400-902, Uberlândia, MG, Brazil.
Shortcut link to this study:
Hexavalent chromium is frequently found in industrial effluents as a result of the industrial applications of this compound and its anti-corrosive features. However, hexavalent chromium is extremely toxic, and its discharge in water is regulated, with a maximum limit of 0.1 mg/L in accordance with legislation established by CONAMA-Brazil (no. 397, April 3, 2008). To achieve lower discharge values, it is necessary to reduce from Cr(VI) to Cr(III), which is less toxic, and an economic alternative involves biological removal of this compound. Residence time distributions (RTDs) were measured to evaluate the behavior of actual biofilter operation conditions in a biofilter flow. The medium residence time distributions used were 8 and 24 h (recommended by the legislation). To optimize this process, a central composite design was used, considering the initial chromium concentration and pH as the independent variables and the removal of hexavalent chromium as the response. The boundary curves and surface response showed optimal behavior at 3.94 mg/L [Cr(0)] and a pH of 6.2. The removal process of hexavalent chromium is mathematically described by the Michaelis-Menten kinetic model. This model appropriately represents the variation of chromium concentration along the bioreactor.
PMID: 21216521

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