Performance evaluation of Azadirachta Indica (Neem Tree) bark in the remediation of Pb4 + and Cr3 + from galvanizing industrial wastewater

Abstract

The menace of wastewater pollution in the 21st century is becoming alarming. Application of the low-cost adsorbents for wastewater treatment has received more attention this moment in environmental history than never. Most industrial wastewater has not been receiving adequate treatment prior to disposal into the nearby stream, and this is a potential threat to plants and animals feeding therefrom. There is therefore the need to proffer an effective solution to this pollution problem. An approach of bioremediation with a cost-effective plant waste is considered apt, with the application of Azadirachta indica (Neem tree) bark as adsorbent in this study. Galvanizing/wire-gauze industrial wastewater effluents were collected and subjected to Atomic Absorption Spectrophotometry (AAS) analysis to determine the concentrations of heavy metals. Phytochemical and Proximate analyses of the adsorbent were performed while adsorption study with the effects of adsorbent dosage, contact time, stirring speed and pH on the adsorption process during the wastewater treatment was carried out. The adsorption isotherms and kinetic models that best described the adsorption of Pb 4+ and Cr 3+ were established.

Biosorption of Colour, Copper and Zinc in Textile Wastewater using Carbonized Orange Peels

“…The peels were washed under sterilized water to get rid of any dirt and undesirable elements. They were aseptically cut into little pieces for comfortable drying, and then dried in an oven at 100 ± 2 o C temperature for 24 hrs (Ojoawo et al, 2018). The dried pieces were powdered using mixer grinder and sieved using BS Sieve 10 (i.e.…”

“…(1) and the removal efficiency determined through computation of the percentage adsorption using Eq. (2) (Song et al, 2014;Ojoawo et al, 2018). Where qe is the adsorption capacity at equilibrium (mg of ions/g of orange peels), V is the volume of the aqueous solution (mL), Co is the concentration before adsorption (mg/L), Ce is the equilibrium concentration after adsorption (mg/L) and m is the mass in gram of the adsorbent.…”