Ammonia and cod removal from synthetic leachate using rice husk composite adsorbent

Abstract

Ammonia and chemical oxygen demand (COD) were the most two problematic parameters in the landfill leachate. In this study, a new composite adsorbent derived from rice husk ash waste is evaluated with respect to its ability to remove these contaminants from synthetic leachate. Results indicate that the new composite adsorbent is able to adsorb both ammonia and COD. It has a higher adsorption capacity for ammonia (Q = 2.2578 mg/g) and an almost equal adsorption capacity for COD (Q = 2.8893) when compared with commercially activated carbon. The adsorption kinetics of this new product for ammonia and COD were primarily represented by the pseudo second-order mechanism. The overall adsorption rate of the ammonia and COD adsorption processes appears to be determined by chemisorption process. The regenerated composite adsorbent indicated higher adsorption capacities of ammonia and COD, i.e. 12.9366 mg/g and 3.1162 mg/g, respectively.

Utilization of Empty Fruit Bunch Fibre as Potential Adsorbent for Ammonia Nitrogen Removal in Natural Rubber Wastewater

“…This finding tallies with the observations reported by previous authors [23,24]. Explained by Halim et al, [25], the properties of ammonia nitrogen in aqueous solution explain the result; the existence of two types of elements, ammonia, NH 3 (basic) and ammonium ions, NH 4 + (acidic). Therefore, the removal of ammonia is supposed to be higher at low pH, and vice versa, due to the cation exchange mechanism in aqueous solution.…”

Remediation of Simulated Landfill’s Leachate Using Waterworks Sludge and Other Conventional Materials

“…Fig.8 illustrate that the removal efficiency of COD was increased from 13 to 69.5% due to change of CAC doses from 5 to 70 g for initial concentration of 500 mg/L. The increasing of removal efficiency may be due to the hydrophobic surfaces themselves; microspore structure, high adsorption capacity, and active surfaces that make CAC more suitable in the adsorption of organic materials [15]. The increasing in the CAC dosage did not cause any significant change in the removal efficiency due to reaching the sorption capacity.…”

Ammonia Removal From Sewage Wastewater Using Chemically Modified Sand

“…A Masterflex peristaltic pump was employed to feed the stock solution to the column at 20 mL/min of flow rate. Fixed bed column adsorption experiment was perform at pH 7 as suggested by a previous researcher, which was the optimum pH for ammonia adsorption (Halim et al, 2011). Samples were collected at various time intervals and analyzed for ammoniacal nitrogen using the Nesslerization colorimetric method (APHA, 1995).…”