Abstract
This paper discusses the effects of pH and concentration on the capability of E. coli ATCC29522 and S. epidermidis RP62A biofilm with bentonite in removing divalent copper, nickel and lead from wastewater. Batch adsorption study at laboratory scale was utilized to evaluate the potential use of bacterial biomass (E. coli ATCC29522 and S. epidermidis RP62A) aided with geosynthetic clay (bentonite) for the removal of Cu2+ , Ni2+ and Pb2+ . Results revealed that removal of Cu2+ , Ni2+ and Pb2+ by both types of organisms supported with bentonite were high in the first 4 hours of the experiment. This illustrates that the binding site on that particular time was abundant. Hence, the removal rate was evident at high concentration depicting the line adsorption equilibrium. It also revealed that S. epidermidis RP62A supported with bentonite had the highest affinity to Copper and Lead with Qm = 277.7 mg/g and 5.0075 mg/g, respectively. While E. coli ATCC 29522 had the highest affinity to Nickel (Qm= 58.82 mg/g). Hence, the sorption of Cu2+ , Ni2+ and Pb2+ onto E. coli ATCC29522 and S. epidermidis RP62A biofilm supported with bentonite clay occurred through monolayer chemisorption on the homogeneous surface of E. coli ATCC29522 and S. epidermidis RP62A biofilm with bentonite clay. Batch kinetics studies revealed that the sorption of Cu2+ , Ni2+ and Pb2+ onto E. coli ATCC29522 and S. epidermidis RP62A biofilm supported with bentonite clay was well described by a pseudo-second-order equation model of type 1 (R2 = 0.9999), which implies that chemisorption is the rate limiting step.
Highlights
Heavy metals pollution has become a global issue of great concern due to their higher toxicities, higher bioaccumulation in human body, food chain, nature of non-biodegradability and most likely carcinogenicities to human
The main goal of this study focuses on investigating the potential removal of Cu2+, Ni2+ and Pb2+from Simulated Wastewater using Biofilms of Escherichia coli ATCC 25922 (E.coli) and Staphylococcus epidermidis RP62A (S. epidermidis) supported with bentonite in a single-component system, with focus on evaluating the effects of pH and concentration on the removal
3.1 Minimum inhibitory concentration (MIC) Results of the MIC diagnostic showed that E.coli ATC 25922 and S. epidermidis RP62A can survive and resist in lead solution with concentration greater than 2000 mg/L
Summary
Heavy metals pollution has become a global issue of great concern due to their higher toxicities, higher bioaccumulation in human body, food chain, nature of non-biodegradability and most likely carcinogenicities to human. Mercury, chromium, arsenic, cadmium, zinc, copper and nickel are the most common contaminants found in contaminated surface water and groundwater as well as industrial wastewater The occurrence of these heavy metals in water causes great threats to humans and other living organisms [1]. Natural bentonites are argillaceous materials that have been widely used to remove toxic metal ions, dyes, chlorophenols and drugs [6]. Due to their high specific surface area, high cation exchange capacity (CEC), their chemical and physical stability, they can be effectively employed as adsorbents for many wastewater pollutants [7]. This study attempt to augment results that are helpful in removing heavy metals from polluted water specially contaminants coming from industrial facilities. Agitation rate will be considered at constant speed of 150 rpm and bentonite as a support
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