scholarly journals Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

2020 ◽  
Vol 10 (10) ◽  
pp. 3445 ◽  
Author(s):  
Roberta Ferrentino ◽  
Riccardo Ceccato ◽  
Valentina Marchetti ◽  
Gianni Andreottola ◽  
Luca Fiori
Keyword(s):  
Methylene Blue ◽  
Sewage Sludge ◽  
Adsorption Capacity ◽  
Physicochemical Characterization ◽  
Hydrothermal Carbonization ◽  
Water Remediation ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Batch Adsorption ◽  
High Concentration

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.

scholarly journals Removal of organic contaminant by municipal sewage sludge-derived hydrochar: kinetics, thermodynamics and mechanisms

2018 ◽  
Vol 78 (4) ◽  
pp. 947-956 ◽  
Author(s):  
Jia Wei ◽  
Yitao Liu ◽  
Jun Li ◽  
Hui Yu ◽  
Yongzhen Peng
Keyword(s):  
Sewage Sludge ◽  
High Surface ◽  
High Surface Area ◽  
Correlation Coefficients ◽  
Hydrothermal Carbonization ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Wide Range ◽  
Pseudo Second Order ◽  
Physical Interactions

Abstract In this work, a microporous municipal sewage sludge-derived hydrochar (MSSH) with relatively high surface area and abundant surface organic functional groups was produced through hydrothermal carbonization. Based on the adsorption results over a wide range of conditions, the prepared MSSH was suggested as a promising adsorbent for CV because of its high and efficient adsorption capability. The experimental data were fitted to several kinetic models. Based on calculated respective parameters such as rate constants, equilibrium adsorption capacities and correlation coefficients, the pseudo second-order model proved the best in describing the adsorption behavior of MSSH. Through kinetics, thermodynamic modeling studies and material characterization, a plausible adsorption process was discussed under the conditions used in this study. It can be confirmed that the adsorption of CV onto MSSH is via both physical interactions (electrostatic interaction and Van der Waals' force) and chemical interactions (formation of H-bonding).

Leaching of Phosphorus From Ashes of Co-Combustion of Sewage Sludge and Wood

2005 ◽  
Author(s):  
Anita Pettersson ◽  
Bengt-A˚ke Andersson ◽  
Britt-Marie Steenari ◽  
Lars-Erik A˚mand ◽  
Bo Leckner
Keyword(s):  
Sewage Sludge ◽  
Ph Value ◽  
Animal Manure ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Bag Filter ◽  
High Concentration ◽  
Recovery Method ◽  
Toxic Trace Elements ◽  
Phosphorus Sources

Municipal sewage sludge has a high concentration of phosphorus, which should be recovered because phosphorus is a limited natural resource. In this work, sewage sludge was co-fired with wood in a FBC boiler. The aim of the investigating was to study the solubility of phosphorus in the ashes, by leaching as an alternative to the phosphorous recovery method of using the ashes directly on farmlands. The fly ashes from the boiler’s secondary cyclone and bag filter were leached at various pH-values and the release of phosphorus was measured. Only acidic leaching was applied. The ashes precipitated with Al2(SO4)3 released nearly all phosphorus at a pH-value of 1, whereas the ashes precipitated with Fe2(SO4)3 did not release all phosphorus even at the very low pH of 0.5. The concentrations of phosphorous in the leachate must be compared with liquid phosphorus sources such as human urine or liquid animal manure used as fertilisers. This may result in that the leachate has to be processed further. A continuation of the work to investigate to what extent the leachate is contaminated with toxic trace elements is necessary.

scholarly journals Reclamation of phosphogypsum deposition site in Wislinka near Gdansk with municipal sewage sludge

2019 ◽  
pp. 115-124
Author(s):  
Piotr Kowalik ◽  
Ewa Wojciechowska
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Land Application ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment ◽  
High Concentration ◽  
Enteric Parasites ◽  
Post Industrial

Utilization of sewage sludge is becoming one of the biggest environmental problems.One of the possible solutions is application of sludge to soil amendment. Sludge is a goodnatural fertilizer due to high concentration of organic carbon and nutrient elements (N, P).On the contrary, sewage sludge also contains heavy metals and may be contaminatedwith enteric parasites. Thus application of sludge to land could result in contamination ofsurface and ground waters and including trace metals in the food chains due tocontamination of plants grown on sludge amended soils. Hence land application of sludgeought to be carefully monitored and follow stringent regulations, which are often difficultto fulfil. However, if sludge is applied to reclamation of degraded post-industrial lands,waste deposition sites, landfills and formation of soil-like surface layer on soil-lessgrounds, the restrictions are not so stringent and easier to fulfil than in cases when cropsare grown on sludge amended soils.In the article reclamation of a phosphogypsum deposition site in Wislinka near Gdanskusing sewage sludge from a municipal wastewater treatment plant (WWTP) is discussed.Phosphogypsum deposit in Wislinka for many years has been one of the biggestenvironmental problems of the region, causing permanent complainants from localcommunities. Reclamation of the deposition site started in 1999 and has been continuedup till now. Covering of the slopes with a layer of sludge reduces dangerous wind erosionof dust and promotes plants succession.

scholarly journals Preparation of Porous Biochars by the Co-Pyrolysis of Municipal Sewage Sludge and Hazelnut Shells and the Mechanism of the Nano-Zinc Oxide Composite and Cu(II) Adsorption Kinetics

2020 ◽  
Vol 12 (20) ◽  
pp. 8668
Author(s):  
Xi Chen ◽  
Ran Zhang ◽  
Bing Zhao ◽  
Guangjian Fan ◽  
Haibo Li ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Adsorption Capacity ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Cellulose Content ◽  
Nano Zinc Oxide ◽  
N2 Atmosphere ◽  
Development And Utilization ◽  
Nano Zinc ◽  
Hazelnut Shells

Municipal sewage sludge (MSS) and hazelnut shells were selected for co-pyrolysis and chemically activated with K2CO3 in a N2 atmosphere. The biochar was then modified by photocatalysis. Hazelnut shells, as a solid waste, were selected as a carbon source additive because of its high cellulose content and similar structure to natural wood. Using hazelnut shells could increase the specific surface area, enhance the porosity, and improve the adsorption capacity of the biochar. Hazelnut shells could also reduce the content of heavy metals in the raw biochar materials, along with increasing the ecological security of biochar and contributing to its further development and utilization. FTIR was used to study the changes in the functional groups on the biochar surface. The layered porous structure of the biochar was observed by SEM. The Cu(II) adsorption capacity of the biochar was 42.28 mg/g after 24 h. The Langmuir and pseudo-second-order models effectively described Cu(II) adsorption.

Hybrid photoactive materials from municipal sewage sludge for the photocatalytic degradation of methylene blue

2011 ◽  
Vol 13 (12) ◽  
pp. 3431 ◽  
Author(s):  
Juan Matos ◽  
Maibelin Rosales ◽  
Andreína García ◽  
Cesar Nieto-Delgado ◽  
José R. Rangel-Mendez
Keyword(s):  
Methylene Blue ◽  
Sewage Sludge ◽  
Photocatalytic Degradation ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Photoactive Materials
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