USE OF EGGSHELLS FOR THE ADSORPTION OF HEAVY METALS FROM WASTEWATER

Heavy metals are discharged into water from various industries. They can be toxic or carcinogenic in nature and can cause severe problems for humans and aquatic ecosystems. Thus, the removal of heavy metals from wastewater is a serious problem. The adsorption process is widely used for the removal of heavy metals from wastewater because of its low cost, availability and eco-friendly nature. Both commercial adsorbents and bioadsorbents are used for the removal of heavy metals from wastewater, with high removal capacity. This review article aims to compile scattered information on the different adsorbents that are used for heavy metal removal and to provide information on the commercially available and natural bioadsorbents used for removal of chromium, cadmium and copper, in particular. Prepare single elemental standard for each metal (Cr, Cd and Pb) by diluting 1000 mg/L stock calibration solution. A minimum of five standard working solutions are prepared from the stock, the solution ranged between 0.1 mg/L to 10 mg/L External calibration is used by running de-ionized water and a suit of calibration standards for each element. The calibration curve is then generated for each metal. The solution and blank are then run on AAS (Varian SpectrAA 600 model, U.SA.) to obtain the absorbance. Concentration of the metals in the sample are calculated from the .equationthe calibration curve.