Magnetic biochar synthesized with waterworks sludge and sewage sludge and its potential for methylene blue removal

Abstract To apply the principles of sustainability, this study aims to prepare the composite sorbent from mixing of solid wastes that resulted from activities of treatment plants for wastewater and water supply. The manufacturing process depends on the mixing of sewage sludge with waterworks sludge at different proportions and the best mixture is modified by ferric nitrate solution. The prepared composite sorbent was evaluated as permeable reactive barrier (PRB) in the capturing of methylene blue (MB) dye presented in the simulated groundwater. Results proved that the suitable mixture of composite sorbent consisting of 0.25 g sewage sludge with 0.75 g waterworks sludge coated with aqueous solution of 2 g of Fe(NO3)2 achieved the maximum sorption capacity. In comparison with Freundlich model, Langmuir expression described the sorption measurements in a well manner; so, the chemisorption is governed by the removal of MB with maximum adsorption capacity reached to 268.98 mg/g. Kinetic measurements could be more representative by pseudo-first-order model and this means that the sorption process is supported by physical forces. Finally, the effects of inlet concentrations and bed thickness on the migration of MB front were simulated in an efficient manner by COMSOL Multiphysics 3.5a package with root mean squared errors not in excess of 0.152.

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Dried sewage sludge as an efficient adsorbent for pollutants: cationic methylene blue removal case study

Nanotechnology for Environmental Engineering ◽

10.1007/s41204-021-00111-6 ◽

2021 ◽

Vol 6 (1) ◽

Author(s):

Youssef Aoulad El Hadj Ali ◽

Mohammadi Ahrouch ◽

Abdellatif Ait Lahcen ◽

Abdoulaye Demba N’diaye ◽

Farida El Yousfi ◽

...

Keyword(s):

Methylene Blue ◽

Sewage Sludge ◽

Methylene Blue Removal ◽

Efficient Adsorbent

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Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

Nanomaterials ◽

10.3390/nano11102473 ◽

2021 ◽

Vol 11 (10) ◽

pp. 2473

Author(s):

Huiping Zeng ◽

Wei Qi ◽

Longxue Zhai ◽

Fanshuo Wang ◽

Jie Zhang ◽

...

Keyword(s):

Methylene Blue ◽

Sewage Sludge ◽

Low Cost ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Adsorption Experiment ◽

Element Analysis ◽

Magnetic Biochar ◽

Pseudo Second Order

The development of low-cost adsorbent is an urgent need in the field of wastewater treatment. In this study, sludge-based magnetic biochar (SMB) was prepared by pyrolysis of sewage sludge and backwashing iron mud without any chemical agents. The samples were characterized by TGA, XRD, ICP, Organic element analysis, SEM, TEM, VSM and BET. Characterization analysis indicated that the magnetic substance in SMB was Fe3O4, and the saturation magnetization was 25.60 emu·g−1, after the adsorption experiment, SMB could be separated from the solution by a magnet. The batch adsorption experiment of methylene blue (MB) adsorption showed that the adsorption capacities of SMB at 298 K, 308 K and 318 K were 47.44 mg·L−1, 39.35 mg·L−1, and 25.85 mg·L−1, respectively. After one regeneration with hydrochloric acid, the maximum adsorption capacity of the product reached 296.52 mg·g−1. Besides, the adsorption kinetic described well by the pseudo-second order model revealed that the intraparticle diffusion was not just the only rate controlling step in adsorption process. This study gives a reasonable reference for the treatment of sewage sludge and backwashing iron mud. The product could be used as a low-cost adsorbent for MB removal.

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Banana stem based activated carbon as a low-cost adsorbent for methylene blue removal: Isotherm, kinetics, and reusability

Alexandria Engineering Journal ◽

10.1016/j.aej.2021.07.022 ◽

2021 ◽

Author(s):

Erni Misran ◽

Okta Bani ◽

Elfrida Margaretha Situmeang ◽

Adelina Suciani Purba

Keyword(s):

Methylene Blue ◽

Activated Carbon ◽

Low Cost ◽

Methylene Blue Removal ◽

Banana Stem

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Removal of Methylene Blue and Orange-G from Waste Water Using Magnetic Biochar

International Journal of Nanoscience ◽

10.1142/s0219581x1550009x ◽

2015 ◽

Vol 14 (04) ◽

pp. 1550009 ◽

Cited By ~ 23

Author(s):

N. M. Mubarak ◽

Y. T. Fo ◽

Hikmat Said Al-Salim ◽

J. N. Sahu ◽

E. C. Abdullah ◽

...

Keyword(s):

Methylene Blue ◽

Contact Time ◽

Agitation Speed ◽

Adsorption Kinetic ◽

Maximum Adsorption Capacity ◽

Optimum Conditions ◽

Magnetic Biochar ◽

Design Expert ◽

Orange G ◽

Pseudo Second Order

The study on the removal of methylene blue (MB) and orange-G dyes using magnetic biochar derived from the empty fruit bunch (EFB) was carried out. Process parameters such as pH, adsorbent dosage, agitation speed and contact time were optimized using Design-Expert Software v.6.0.8. The statistical analysis reveals that the optimum conditions for the maximum adsorption of MB are at pH 2 and pH 10, dosage 1.0 g, and agitation speed and contact time of 125 rpm and 120 min respectively. While for orange-G, at pH 2, dosage 1.0 g, and agitation speed and contact time of 125 rpm and 120 min respectively. The maximum adsorption capacity of 31.25 mg/g and 32.36 mg/g for MB and orange-G respectively. The adsorption kinetic for both dyes obeyed pseudo-second order.

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