Treatment of Wastewater Containing Hexavalent Chromium Using Zeolite Ceramic Adsorbent in Adsorption Column

Abstract

Natural Zeolites in powdered form have commonly used as adsorbent and one of the most crucial compound in water treatment plant, in filter system of petrochemicals or other processes under environmentally, physically and chemically conditions. But in the form of powder, zeolites are easily washed out in liquid or gas stream. Therefore, a modification would be necessary to solve this problem. Zeolites and clay were modified into ceramic adsorbent to adsorb heavy metal pollutant that is hexavalent chromium Cr (VI) contained in electroplating industrial effluents. Zeolite and clay were mixed evenly and molded into small balls with 5-6 mm diameter and dried at 1000 o C for 48 hrs. This adsorbent was activated with HCl 32% solution for 1 hr to enhance its adsorption potential. Ten samples with various ratios of zeolite:clay (3:37-12:28) with the total adsorbent mass of 1000 g was examined. Cr (VI) uptake in liquid wastewater was studied by varying contact time and the ratio of zeolite and clay. The effect of activation treatment with HCl 32% solution on adsorption performance of zeolite ceramic adsorbent was also investigated. Analysis of wastewater output indicates a reduction of hexavalent chromium concentration reaches 99.45% at contact time 10 h with 12:28 ratio of activated adsorbent. This shown that the process of adsorption had greatly reduced the contamination of Cr (VI) and may have been a solution for environment problem regarding wastewater containing Cr (VI).

Powdered Activated Carbon (PAC)-Ceramic Composite Adsorbent for Iron and Aluminum Cations Removal from Acid Mine Drainage

“…It has been shown that a longer contact time enhances the adsorption process. The alkaline groups on the surface of the activated carbon bind the cations from the wastewater to the adsorbent surface during the adsorption process in an aqueous solution [18,19].Fe and Al cations must have interacted with the adsorbent during the adsorption process. In this case, the surface layer of the activated carbon is basic.…”

Acid Mine Drainage Treatment Using Activated Carbon Ceramic Adsorbent in Adsorption Column

“…where q e is the adsorption capacity (mg g -1 ), C o and C t are the initial and equilibrium concentration of metallic ions in the samples solution (mg L -1 ). V is the volume of testing solution (L) and W is the weight of adsorbent (g) [32], [33].…”

Fabrication, Characterization and Removal of Methyl Orange, Chromium (Cr) and Lead (Pb) in Aqueous Solutions by Low‐Cost Clay/Macadamia Nutshell Powder Ceramic Filters

“…Several studies have been conducted on the application of filters in the removal of dyes such as methyl orange (MO) and toxic metals including chromium (Cr). [24][25][26][27][28][29][30] A comparative analysis of the capabilities of the filters used in the above-mentioned studies and the filters fabricated and used in the current study is discussed. The fabricated ceramic filters are deemed to be cost-effective and environmentally friendly because they were derived from natural clay (a sustainable and natural material) and the macadamia nutshells (an agricultural waste product from the macadamia nuts processing industry).…”