Optimization and Comparison of Cd Removal from Aqueous Solutions Using Activated and Non-activated Carbonaceous Adsorbents Prepared by Pyrolysis of Oily Sludge

Mohammadi, Shohreh; Mirghaffari, Nourollah

doi:10.1007/s11270-014-2237-x

Cited by 18 publications

(11 citation statements)

References 34 publications

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“…Growing interest has been shown in the application of oily sludge-derived char (OSDC) to the removal of pollutants from wastewater in recent years. For example, Mohammadi and Mirghaffari (2015) produced activated carbon (AC) from oily sludge through a chemical method and they found a surface area of 327.96 m 2 /g. To further improve the adsorption capability of an AC derived from oily sludge, Wang et al (2017b) added a solvent de-oiling step before activation.…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…For this reason, some authors advocate the use of oily sludge-derived char (OSDC) for adsorbent production. For example, Mohammadi and Mirghaffari (2015) produced char from oily sludge by pyrolysis and found the Brunauer-Emmett-Teller (BET) surface area of the char was relatively low (i.e., 3.63 m 2 /g). To improve the surface area, they used potassium hydroxide (KOH) as an activator to produce activated char with a much higher surface area (i.e., 327.97 m 2 /g).…”

Section: Effects Of Parameters On Solid Productionmentioning

confidence: 99%

“…Therefore, some authors advocate the use of oily sludge-derived char (OSDC) for adsorbent production (Mohammadi and Mirghaffari, 2015;Wang et al, 2017b). However, there is a lack of information on the roles of different sorption mechanisms for OSDC.…”

Section: Summary Of Literature Reviewmentioning

confidence: 99%

“…In the past years, growing interest has been shown in the application of oily sludge-derived char (OSDC) to remove heavy metals from wastewater. For example, Mohammadi and Mirghaffari (2015) reported that the cadmium (Cd 2+ ) sorption capacity for the non-activated OSDC was 1.49 mg/g, compared to that for activated OSDC was 19.23 mg/g. Seredych and Bandosz (2006) produced the OSDC at 650 °C and found the maximum copper (Cu 2+ ) sorption ability of OSDC (74.28 mg/g) was about five times higher than that of wood-based (15.88 mg/g) activated carbon.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from sewage sludge, industrial oily sludge was also used as material for developing efficient sorbent. For example, Mohammadi and Mirghaffari (2015) produced oily sludge-derived char (OSDC) from pyrolysis of oily sludge with the cadmium (Cd 2+ ) sorption capacity of 1.49 mg/g. To further improve the sorption capability of OSDC, thermochemical treatment was used to prepare the activated OSDC, with cadmium (Cd 2+ ) sorption capacity reaching 19.23 mg/g.…”

Section: Introductionmentioning

confidence: 99%

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Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Tian¹

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The effective treatment of oily sludge has been a challenging problem faced by the petroleum industry worldwide. It is a semi-solid mixture of hydrocarbons, water, metallic ions, and suspended fine solids. The recalcitrant nature of oily sludge makes the treatment a difficult and costly task. The objective of this dissertation research was to develop environmentally friendly and economically competitive techniques for oily sludge treatment. Three different approaches were developed: ionic liquid (IL)-enhanced solvent extraction, co-pyrolysis with wood waste, and value-added utilization of oily sludge as sorbent to remove lead (Pb 2+) and cadmium (Cd 2+) from solution. Firstly, as compared to conventional solvent extraction, the ILenhanced solvent extraction not only improved oil recovery efficiency but also greatly reduced solvent and energy consumption as well as shortening the treatment duration even at low IL concentration. Secondly, co-pyrolysis of oily waste and hog fuel was conducted in a fixed bed reactor. Three experimental parameters (pyrolysis temperature, reaction time, and hog fuel addition) were explored to optimize both oil recovery and metal ion immobilization. The latter was tested through sequential extraction techniques with high temperature pyrolysis leading to metal ions fixed within the residues. The addition of hog fuel had a significant synergistic effect on the distribution of metal ions in the various extraction fractions resulting in lower risk index (RI) values. Thirdly, the oily sludge-derived char (OS500) obtained at 500 °C could effectively remove Pb 2+ from solution with the maximum sorption capacity of 373.2 mg/g (based on a Langmuir model). Sorption of Pb 2+ by the OS500 was mainly attributed to its precipitation with carbonate (CO3 2-) originating in OS500. The maximum sorption capacity for Cd 2+ , using a Langmuir model, was 23.19 mg/g. Complexation and metal ion exchange dominated Cd 2+ sorption on OS500. The Pb 2+ sorption capacity dramatically decreased as the iii pyrolysis temperature increased from 500 to 900 °C due to the decomposition of minerals which could release CO3 2at high temperature. The activated OS500 showed a higher sorption capacity (90.06 mg/g) for Cd 2+ than OS500 (23.95 mg/g) because conversion of barite (BaSO4) to witherite (BaCO3) after chemical activation favored the precipitation of Cd-carbonate. iv CO-AUTHORSHIP For all the chapters in this dissertation, I was the principal investigator including design of studies, acquisition of data, and analysis of data. I wrote the manuscripts and was responsible for incorporating comments and feedbacks in the revised manuscripts. Dr. Jianbing Li supervised the experiments and contributed to experimental design, data analysis, and revision of the manuscripts. He is included in authorship on all resulting publications. Dr. Bill McGill and Dr. Todd Whitcombe contributed to the design and implementation of experiments and helped review and improve the manuscripts, so they were included in some of my publications. Dr. ...

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Section: Statement Of the Problemmentioning

confidence: 99%

Section: Effects Of Parameters On Solid Productionmentioning

confidence: 99%

Section: Summary Of Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Tian¹

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Experimental investigation of the dewatering performance and product characteristics of oily scum at increased reaction time through hydrothermal treatment

Deng

Shi

Tan

et al. 2021

Asia-Pacific J Chem Eng

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Hydrothermal treatment (HT) is a promising thermal conversion technology that can convert wastes with high moisture content into value-added products.The effects of reaction time on the dewatering performance and product characteristics of oily scum were investigated through HT in this study. The main components in liquid and the combustion characteristics of hydrochars were also studied. Results showed that as the HT reaction time increased, the appearance of the liquid product changed from light yellow clarifying solution to yellow turbidity oil-water mixture. The liquid yield obtained from the HT process of oily scum increased with the increase of reaction time, while the moisture yield in hydrochars decreased gradually. The increase of reaction time improved the filtration performance and dewaterability of oily scum.Hydrochars presented the microscopic properties of the smooth and rough surfaces as well as the particles with different sizes. The thermogravimetric analysis showed that the devolatilization and combustion process of hydrochars was further separated into the two combustion phases of light and heavy volatiles. The combustion process of hydrochars was easier than dried oily scum due to lower activation energy and pre-exponential factor. The results obtained in this study could provide valuable references for the reasonable treatment and effective utilization of oily scum.

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Impact of pyrolysis temperature and activation on oily sludge-derived char for Pb(II) and Cd(II) removal from aqueous solution

Tian

McGill

et al. 2020

Environ Sci Pollut Res

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Optimization and Comparison of Cd Removal from Aqueous Solutions Using Activated and Non-activated Carbonaceous Adsorbents Prepared by Pyrolysis of Oily Sludge

Cited by 18 publications

References 34 publications

Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Experimental investigation of the dewatering performance and product characteristics of oily scum at increased reaction time through hydrothermal treatment

Impact of pyrolysis temperature and activation on oily sludge-derived char for Pb(II) and Cd(II) removal from aqueous solution

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