ASSESSMENT OF THE REMOVAL OF NICKEL AND CHROMIUM IN GREYWATER USING GLIRICIDIA SEPIUM AS AN ADSORBENT

Elemile, Olugbenga O. ASSESSMENT OF THE REMOVAL OF NICKEL AND CHROMIUM IN GREYWATER USING GLIRICIDIA SEPIUM AS AN ADSORBENT. In: 9 th Conference on Environmental Health Sciences, 22 Nov -24 Nov 2021, Ibadan.

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Abstract

Background Greywater contains a variety of inorganic compounds, which are characterized as toxic, carcinogenic, and mutagenic, which when persistent in the environment have the potential to cause an adverse effect on man and the environment. Little has been documented on the use of gliricidia sepium as an adsorbent in the removal of some heavy metals present in greywater. The study investigated the adsorption of nickel and chromium by modified gliricidia sepium stem from some bathroom greywater. Methods The gliricidia sepium stem was modified by mixing with 0.1 M NaOH. The effects of varying adsorbent loading, contact time, and pH of adsorption were studied. Similar experiments were carried out using unmodified gliricidia sepium stem, in order to compare the results obtained from the modification experiments. Results The results obtained show that the dosage of 5g was able to adsorb 0.38; 0.15 mg/L at the 4th and 28th hour for nickel and chromium respectively for the modified gliricidia sepium. For the non�modified gliricidia sepium the dosage of 5g was able to adsorb 0.0.09; 0.128 mg/L at the 28th and 24th hour for nickel and chromium respectively. Conclusion The NaOH modified adsorbent gave the best result for removal of nickel and chromium from bathroom greywater.

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