Abstract: The functional strains with a high tolerance to heavy metals Pb2+ and Cd2+ was isolated from the soil of containing heavy metal waste accumulation zone, prepared by embedding immobilized bio-adsorbent and its application in adsorption of wastewater of containing heavy metals. The effects of initial concentration, adsorption time, pH value of wastewater, dosage of adsorbent on the adsorption performance were investigated. The experimental results show that the selected strains were brevibacteria, maximum tolerated concentration of Pb2+ and Cd2+ were 2200 mg/L and 700 mg/L; pH of the wastewater is 6, and the adsorbent dosage is 10 g/L, Pb2+ and Cd2+ reached the maximum adsorption rate are 87.77% and 57.50%; Pb2+ and Cd2+ basic can be rapidly adsorbed in the 40min and reached equilibrium concentration, and the saturated adsorption capacity reached 114.36 mg/g and 82.12 mg/g, respectively; the most suitable pH of initial wastewater for adsorption is 5-7; The increase of the initial concentration of Pb2+ and Cd2+ will decrease the adsorption rate, and the initial concentration of Pb2+ is greater than the initial concentration of Cd2+. Langmuir and Freundlich adsorption equation show that the surface adsorption of Pb2+ and Cd2+ in wastewater is mainly single molecular layer adsorption process; Kinetic equation fitting of Orde Pseudo-second shows that the rate limiting step of adsorption process is mainly chemical adsorption, and Pb2+ is more easily absorbed than Cd2+.
LI Da-jun ZHOU Li WANG Qing-long GE Zheng
. Adsorption Performance of Pb2+ and Cd2+ in Wastewater by Immobilized Bio-adsorbent[J]. The Chinese Journal of Process Engineering, 2017
, 17(2)
: 248
-253
.
DOI: 10.12034/j.issn.1009-606X.216299
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