Lead and Cadmium Removal from Aqueous Medium Using Coir Pith as Adsorbent: Batch and Fixed bed Column Studies

Amarasinghe, Bmwpk

doi:10.31357/jtfe.v1i1.82

Cited by 10 publications

(6 citation statements)

References 25 publications

(20 reference statements)

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“…The increasing adsorption capability of CH observed in this study was probably due to the increase in the surface area of the adsorbent and the extended contact time with the MB solution. Similar observations have been reported by several other researchers (Wang et al 2014;Vadivelan and Kumar 2005;Vijayaraghavan and Prabu 2006;Amarasinghe 2011). Figures 2 and 3 show that it took a longer time for CH to be exhausted with greater bed depth.…”

Section: Effect Of Bed Depth and Contact Time On Breakthrough Curvesupporting

confidence: 78%

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Man¹,

Akinbile²,

Jun³

2015

BioResources

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A study to assess the efficiency of coconut husks (CHs) in removing methylene blue (MB) dye from wastewaters in Malaysia was carried out. A fixed bed column adsorber was set up using flow rates of 40 and 80 mL/min, and the adsorbent (CH) was prepared using the base treatment method with NaOH as activating agent. Three different column bed depths (10, 20, and 25 cm) and unit weights of adsorbent (103, 213, and 260 g) were used. Two models, the bed depth service time (BDST) and Thomas models, were used to validate the adsorption capacity results and breakthrough curve. Changing the bed depth from 20 to 25 cm did not result in a significant change in adsorption capacity, therefore a 20-cm bed depth is recommended as the most efficient. Similarly, adsorption capacity increased as flow rates increased from 40 to 80 mL/min, indicating that a flow rate of 80 mL/min yielded optimum efficiency. The two models also provided predictions with good fits of the bed depth effect, the adsorption capacity, and the breakthrough curve of CH for MB removal.

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Section: Effect Of Bed Depth and Contact Time On Breakthrough Curvesupporting

confidence: 78%

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Man¹,

Akinbile²,

Jun³

2015

BioResources

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“…This increase in percentage adsorbed with carbon height is expected because; the surface area available for adsorption increased with increase in the amount of the adsorbent (more binding sites were available for sorption with increase in bed height). Similar observations have been reported by other researchers [23,35,36]. The carbon height of 3.5 cm was therefore achieved as the optimum height because it has yielded the maximum Cd (II) removal.…”

Section: Effect Of Carbon Heightsupporting

confidence: 88%

Adsorption of cadmium (II) from simulated wastewater using <i>Albizia saman</i> pod activated carbon in fixed bed columns

Akpen¹,

Aho²,

Baba³

2018

Nig. J. Tech.

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The possibility of using Albizia saman pod activated carbon (ASPAC) as an adsorbent in fixed down flow adsorption columns to remove Cd (II) from wastewater was investigated for the purpose of converting the waste to a valuable product. The effects of impregnation ratio, particle size, carbon height, pressure head and initial cadmium Cd (II) concentration on the adsorption of Cd (II) from wastewater were investigated. The obtained adsorption data from the experiment was then fitted into the Hutchin's bed depth service time (BDST) model to study the columns performance at 15% and 90% breakthrough concentrations. The BDST model constants were determined. An optimal pressure head of 5 cm, impregnation ratio of 1:6, packing height of 3.5 cm, particle size of 75 µm and initial Cd (II) concentration of 0.029 mg/L were found to be the most effective combination, which removed 100 % of the Cd (II) within a service time of 14 hrs. There was a gradual decrease in the percentage of adsorbed Cd (II) with time; the percentage adsorbed became zero at 44, 56 and 86 hours respectively for 2.5 cm, 3 cm and 3.5 cm carbon heights. The breakthrough curves for Cd (II) adsorption maintained the characteristic S-curve for most dynamic studies. Chisquared test performed on the developed BDST models revealed the goodness of fit of the models for the prediction of the columns performance at all breakthrough concentrations investigated. The use of ASPAC as adsorbent for the removal of Cd (II) from wastewater in adsorption columns is therefore recommended.

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“…The basic method of drying coir pith/peat is to expose it to the sunlight and to allow spontaneous evaporation to ensue. It is indeed a cost-effective heating technique but has several shortcomings, including being laborious and time-consuming, uncontrollable weather conditions, interference by insects and the need for vast working space [54,55]. Meanwhile, industrial or laboratory approaches rely on hot air and oven drying for several conditions, notably rapid and even heating.…”

Section: Effects Of Heating Timementioning

confidence: 99%

Coco Peat as Agricultural Waste Sorbent for Sustainable Diesel-Filter System

Verasoundarapandian

Zakaria

Shaharuddin

et al. 2021

Plants

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Oil spill incidents are hazardous and have prolonged damage to the marine environment. Management and spill clean-up procedures are practical and rapid, with several shortcomings. Coco peat (CP) and coco fibre (CF) are refined from coconut waste, and their abundance makes them desirable for diesel spillage treatment. Using a filter-based system, the selectivity of coco peat sorbent was tested using CP, CF and peat-fibre mix (CPM). CP exhibited maximal diesel sorption capacity with minimal seawater uptake, thus being selected for further optimisation analysis. The heat treatment considerably improved the sorption capacity and efficiency of diesel absorbed by CP, as supported by FTIR and VPSEM–EDX analysis. Conventional one-factor-at-a-time (OFAT) examined the performance of diesel sorption by CP under varying parameters, namely temperature, time of heating, packing density and diesel concentration. The significant factors were statistically evaluated using response surface methodology (RSM) via Plackett–Burman design (PB) and central composite design (CCD). Three significant (p < 0.05) factors (time, packing density and diesel concentration) were identified by PB and further analysed for interactions among the parameters. CCD predicted efficiency of diesel absorbed at 59.92% (71.90 mL) (initial diesel concentration of 30% v/v) and the experimental model validated the design with 59.17% (71.00 mL) diesel sorbed at the optimised conditions of 14.1 min of heating (200 °C) with packing density of 0.08 g/cm3 and 30% (v/v) of diesel concentration. The performance of CP in RSM (59.17%) was better than that in OFAT (58.33%). The discoveries imply that natural sorbent materials such as CP in oil spill clean-up operations can be advantageous and environmentally feasible. This study also demonstrated the diesel-filter system as a pilot study for the prospective up-scale application of oil spills.

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Lead and Cadmium Removal from Aqueous Medium Using Coir Pith as Adsorbent: Batch and Fixed bed Column Studies

Cited by 10 publications

References 25 publications

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Adsorption of cadmium (II) from simulated wastewater using <i>Albizia saman</i> pod activated carbon in fixed bed columns

Coco Peat as Agricultural Waste Sorbent for Sustainable Diesel-Filter System

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