Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater
Source abstract
Abstract
Municipal sewage sludge was subjected to a hydrothermal carbonization (HTC) process for developing a hydrochar with high adsorption capacity for water remediation in terms of dye removal. Three hydrochars were produced from municipal sewage sludge by performing HTC at 190, 220 and 250 °C, with a 3 h reaction time. Moreover, a portion of each hydrochar was subjected to a post-treatment with KOH in order to increase the adsorption capacity. Physicochemical properties of sludge samples, raw hydrochars and KOH-modified hydrochars were measured and batch adsorption studies were performed using methylene blue (MB) as a reference dye. Data revealed that both raw and modified hydrochars reached good MB removal efficiency for solutions with low MB concentrations; on the contrary, MB in high concentration solutions was efficiently removed only by modified hydrochars. Interestingly, the KOH treatment greatly improved the MB adsorption rate; the modified hydrochars were capable of capturing above 95% of the initial MB amount in less than 15 min. The physicochemical characterization indicates that alkali modification caused a change in the hydrochar surface making it more chemically homogeneous, which is particularly evident for the 250 °C hydrochar. Thus, the adsorption process can be regarded as a complex result of various phenomena, including physi- and chemi-sorption, acid–base and redox equilibria.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Thermochemical Biomass Conversion Processes · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano 77, 38123 Trento, Italy
Department of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, Italy
References (51)
Show source-provided references
1. An anaerobic side-stream reactor in wastewater treatment: A review10.2495/SC141212 ↗
2. Recovery of Value-Added Products from Hydrothermal Carbonization of Sewage Sludge10.1155/2013/268947 ↗
3. Hydrothermal carbonization of renewable waste biomass for solid biofuel production: A discussion on process mechanism, the influence of process parameters, environmental performance and fuel properties of hydrochar10.1016/j.rser.2020.109761 ↗
4. Villamil, J.A., de la Rubia, M.A., Diaz, E., and Mohedano, A.F. (2020). Technologies for Wastewater Sludge Utilization and Energy Production: Hydrothermal Carbonization of Lignocellulosic Biomass and Sewage Sludge, Elsevier Inc.10.1016/B978-0-12-816204-0.00007-2 ↗
5. Methane production from process water of sewage sludge hydrothermal carbonization. A review. Valorising sludge through hydrothermal carbonization10.1080/10643389.2018.1561104 ↗
6. Román, S., Libra, J., Berge, N., Sabio, E., Ro, K., Li, L., Ledesma, B., Alvarez, A., and Bae, S. (2018). Hydrothermal carbonization: Modeling, final properties design and applications: A review. Energies, 11.10.3390/en11010216 ↗
7. Hydrothermal carbonization of biomass: A summary and discussion of chemical mecha- nisms for process engineering10.1002/bbb.198 ↗
8. Lucian, M., Volpe, M., and Fiori, L. (2019). Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling. Energies, 12.10.3390/en12030516 ↗
9. Minireview of potential applications of hydrochar derived from hydrothermal carbonization of biomass10.1016/j.jiec.2017.08.026 ↗
10. Production of low-cost adsorbents with tunable surface chemistry by conjunction of hydrothermal carbonization and activation processes10.1016/j.micromeso.2012.08.006 ↗
11. Purnomo, C.W., Castello, D., and Fiori, L. (2018). Granular Activated Carbon from Grape Seeds Hydrothermal Char. Appl. Sci., 8.10.3390/app8030331 ↗
12. Removal of Malachite Green from water using hydrothermally carbonized pine needles10.1039/C4RA15505J ↗
13. Removal of organic contaminant by municipal sewage sludge-derived hydrochar: Kinetics, thermodynamics and mechanisms10.2166/wst.2018.373 ↗
14. Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water10.1007/s11356-015-4849-0 ↗
15. Diaz, E., Manzano, F.J., Villamil, J., Rodriguez, J.J., and Mohedano, A.F. (2019). Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption. Appl. Sci., 9.10.3390/app9235127 ↗
16. Tailoring the porosity of chemically activated hydrothermal carbons: Influence of the precursor and hydrothermal carbonization temperature10.1016/j.carbon.2013.06.017 ↗
17. Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation10.3390/app9235132 ↗
18. Removal of copper and cadmium from aqueous solution using switchgrass biochar produced via hydrothermal carbonization process10.1016/j.jenvman.2012.04.047 ↗
19. Enhanced adsorption of orthophosphate and copper onto hydrochar derived from sewage sludge by KOH activation10.1039/C6RA22327C ↗
20. Lucian, M., and Fiori, L. (2017). Hydrothermal carbonization of waste biomass: Process design, modeling, energy efficiency and cost analysis. Energies, 10.10.3390/en10020211 ↗
21. Hydrothermal carbonization of biomass: Design of a bench-Scale reactor for evaluating the heat of reaction
22. One stage olive mill waste streams valorisation via hydrothermal carbonisation10.1016/j.wasman.2018.09.021 ↗
23. Sorption of bisphenol A, 17α-ethinyl estradiol and phenanthrene on thermally and hydrothermally produced biochars10.1016/j.biortech.2011.03.038 ↗
24. Modeling of the devolatilization kinetics during pyrolysis of grape residues10.1016/j.biortech.2011.09.113 ↗
25. Biomass proximate analysis using thermogravimetry10.1016/j.biortech.2013.03.197 ↗
26. CNR-IRSA (1985). Metodi Analitici Per i Fanghi, CNR-IRSA.
27. Removal of methylene blue from aqueous solutions by chemically modified bamboo10.1016/j.chemosphere.2014.03.118 ↗
28. Removal of methylene blue from aqueous solution by modi fi ed bamboo hydrochar10.1016/j.ecoenv.2018.03.088 ↗
29. The constitution and fundamental properties of solids and liquids10.1021/ja02268a002 ↗
30. Uber Die Adsorption in Losungen
31. Use of activated carbons prepared from sawdust and rice-husk for adsoprtion of acid dyes: A case study of acid yellow 3610.1016/S0143-7208(02)00159-6 ↗
32. Preparation, characterization and evaluation of adsorptive properties of orange peel based activated carbon via microwave induced K 2CO 3 activation10.1016/j.biortech.2011.10.005 ↗
33. Kinetics of pollutant sorption by biosorbents: Review10.1081/SPM-100100009 ↗
34. Pseudo-second order model for sorption processes10.1016/S0032-9592(98)00112-5 ↗
35. Hydrothermal carbonisation of sewage sludge for char production with different waste biomass: Effects of reaction temperature and energy recycling10.1016/j.energy.2017.03.116 ↗
36. Conversion of sewage sludge to clean solid fuel using hydrothermal carbonization: Hydrochar fuel characteristics and combustion behavior10.1016/j.apenergy.2013.04.084 ↗
37. Characterization of hydrochars produced by hydrothermal carbonization of lignin, cellulose, d-xylose, and wood meal10.1021/ie300565d ↗
38. Hydrothermal carbonization of municipal waste streams10.1021/es2004528 ↗
39. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity10.1351/pac198557040603 ↗
40. Adsorption of basic dye (methylene blue) onto activated carbon prepared from rattan sawdust10.1016/j.dyepig.2006.05.039 ↗
41. Adsorption of Methylene Blue onto activated carbon produced from steam activated bituminous coal: A study of equilibrium adsorption isotherm10.1016/j.cej.2006.08.015 ↗
42. Ahmed, T., Noor, W., Faruk, O., Bhoumick, M.C., and Uddin, M.T. (2018). Removal of methylene blue (MB) from waste water by adsorption on jackfruit leaf powder (JLP) in continuously stirred tank reactor. J. Phys. Conf. Ser., 1086.10.1088/1742-6596/1086/1/012012 ↗
43. Chemical evaluation of chars produced by thermochemical conversion (gasification, pyrolysis and hydrothermal carbonization) of agro-industrial biomass on a commercial scale10.1016/j.biombioe.2013.08.026 ↗
44. Migration and risk assessment of heavy metals in sewage sludge during hydrothermal treatment combined with pyrolysis10.1016/j.biortech.2016.09.069 ↗
45. Speciation evolution of zinc and copper during pyrolysis and hydrothermal carbonization treatments of sewage sludges10.1016/j.watres.2018.01.009 ↗
46. Study on the hydrothermal carbonization of swine manure: The effect of process parameters on the yield/properties of hydrochar and process water10.1016/j.jaap.2019.104692 ↗
47. From olive waste to solid biofuel through hydrothermal carbonisation: The role of temperature and solid load on secondary char formation and hydrochar energy properties10.1016/j.jaap.2017.02.022 ↗
48. Hydrothermal treatment coupled with mechanical expression at increased temperature for excess sludge dewatering: Heavy metals, volatile organic compounds and combustion characteristics of hydrochar10.1016/j.cej.2016.03.131 ↗
49. Adsorption of methylene blue by a high-efficiency adsorbent (polydopamine microspheres): Kinetics, isotherm, thermodynamics and mechanism analysis10.1016/j.cej.2014.07.101 ↗
50. Equilibrium, kinetic, thermodynamic, and in situ regeneration studies about methylene blue adsorption by the raspberry-like TiO2@yeast microspheres10.1021/ie4020364 ↗
51. Removal of methylene blue by adsorption onto activated carbon developed from Ficus carica bast10.1016/j.arabjc.2013.04.021 ↗