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Table 2

Results of laboratory tests using natural shrimp shells in treatments A and B (metal concentrations in mg/L)

Measured parameter5 g shrimp shells
10 g shrimp shells
Standard runoff
ABRemoval (%)ABRemoval (%)B
Cr 0.003 0.016 55.60 0.004 0.014 62.20 0.033 
Pb 0.020 0.081 −138.20* 0.126 0.130 7.10 0.014 
Ni 0.050 0.103 −58.50* 0.093 0.125 −15.70* 0.015 
Cu 0.136 0.167 1.80 0.234 0.274 −2.20* 0.034 
Zn 0.190 0.248 22.50 0.359 0.432 11.70 0.130 
Fe 0.421 2.161 62.80 0.789 2.262 63.40 5.390 
Mn 0.158 0.162 34.40 0.199 0.245 14.90 0.089 
pH initial − 6.03 − − 6.03 − 6.03 
pH final − 7.41 − − 7.450 − − 
Measured parameter5 g shrimp shells
10 g shrimp shells
Standard runoff
ABRemoval (%)ABRemoval (%)B
Cr 0.003 0.016 55.60 0.004 0.014 62.20 0.033 
Pb 0.020 0.081 −138.20* 0.126 0.130 7.10 0.014 
Ni 0.050 0.103 −58.50* 0.093 0.125 −15.70* 0.015 
Cu 0.136 0.167 1.80 0.234 0.274 −2.20* 0.034 
Zn 0.190 0.248 22.50 0.359 0.432 11.70 0.130 
Fe 0.421 2.161 62.80 0.789 2.262 63.40 5.390 
Mn 0.158 0.162 34.40 0.199 0.245 14.90 0.089 
pH initial − 6.03 − − 6.03 − 6.03 
pH final − 7.41 − − 7.450 − − 

*Negative results indicate that the adsorbent contaminated the sample.

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