“…This tendency for the oil desorption process could be attributed to the high rate of agitation that needed more energy input and resulted in a strong shear force that fractured the bonds between the oil molecules and the adsorbent material 37 . Similar trend was obtained with that reported for uptake of oil spill by agricultural wastes 35 .…”
Section: Resultssupporting
confidence: 91%
“…From the obtained results it is found that Langmuir model is more effective at predicting the intensity and adsorption capacity of Str and (Str-co-Benz), compared to the Freundlich model confirming monolayer chemisorption of oil particles. The obtained data is similar to that recorded by Peng et al 29 and Kaur & Sodhi 35 . Figure 4 ( A ) Langmuir ( B ) Freundlich, and ( C ) Temkin adsorption isotherm models for the uptake of crude oil onto Str and (Str-co-Benz).…”
Section: Resultssupporting
confidence: 90%
“…In contrast, the percentage of oil uptake decreased from 85 to 14.10% and 94.60 to 22% for Str and (Str-co-Benz), when the crude oil concentration raised from 1 up to 4 g/100 ml, due to the fact that the adsorbed oil particles eventually begins to clog the adsorbent pores close to the outer surface, preventing oil from diffusing to the active sites buried deep within the interior surface 34 . The obtained results agreed with that recorded for uptake of oil spill by agricultural wastes 35 and the modified raw flax fiber 16 .…”
Oil spills are a significant threat to the marine ecosystem that requires immediate removal from the oceanic environment. Many technologies have been employed to clean up oil spills. Of these, adsorption has scored a prominent success due to the high efficiency, economic viability, environmental friendship, and ease of application. The utilization of agricultural waste to produce biosorbents have been considered as an ecofriendly and efficient approach for removing oil. Thus, a new low-cost oil adsorbent was prepared via esterification of the wheat straw (Str) with a hydrophobic benzoyl group, the resulting copolymer (Str-co-Benz) was characterized by FTIR, TGA, DSC, and SEM and used at laboratory scale. The oil spill cleanup process was conducted using a crude oil-natural seawater system under different adsorption conditions such as oil concentration, adsorbent dose, agitation time and speed. Equilibrium studies were performed to determine the capacity of the prepared materials for crude oil adsorption. Langmuir and Freundlich adsorption models were used to describe the experimental isotherms. The reliability of the data was examined and evaluated via application of response surface methodology program. The results showed that oil adsorption followed a pseudo-second-order kinetic model and fitted well with Langmuir model with a maximum adsorption capacity of 10.989 and 12.786 g/g for Str and (Str-co-Benz), respectively. Overall, the modified wheat husk is an effective platform for removing oil from marine ecosystems due to low cost, biodegradability, simple synthesis and fast removal. Moreover, the resulted solid can be used as a fuel in some industrial processes such as steam boilers and brick production incinerators.
“…This tendency for the oil desorption process could be attributed to the high rate of agitation that needed more energy input and resulted in a strong shear force that fractured the bonds between the oil molecules and the adsorbent material 37 . Similar trend was obtained with that reported for uptake of oil spill by agricultural wastes 35 .…”
Section: Resultssupporting
confidence: 91%
“…From the obtained results it is found that Langmuir model is more effective at predicting the intensity and adsorption capacity of Str and (Str-co-Benz), compared to the Freundlich model confirming monolayer chemisorption of oil particles. The obtained data is similar to that recorded by Peng et al 29 and Kaur & Sodhi 35 . Figure 4 ( A ) Langmuir ( B ) Freundlich, and ( C ) Temkin adsorption isotherm models for the uptake of crude oil onto Str and (Str-co-Benz).…”
Section: Resultssupporting
confidence: 90%
“…In contrast, the percentage of oil uptake decreased from 85 to 14.10% and 94.60 to 22% for Str and (Str-co-Benz), when the crude oil concentration raised from 1 up to 4 g/100 ml, due to the fact that the adsorbed oil particles eventually begins to clog the adsorbent pores close to the outer surface, preventing oil from diffusing to the active sites buried deep within the interior surface 34 . The obtained results agreed with that recorded for uptake of oil spill by agricultural wastes 35 and the modified raw flax fiber 16 .…”
Oil spills are a significant threat to the marine ecosystem that requires immediate removal from the oceanic environment. Many technologies have been employed to clean up oil spills. Of these, adsorption has scored a prominent success due to the high efficiency, economic viability, environmental friendship, and ease of application. The utilization of agricultural waste to produce biosorbents have been considered as an ecofriendly and efficient approach for removing oil. Thus, a new low-cost oil adsorbent was prepared via esterification of the wheat straw (Str) with a hydrophobic benzoyl group, the resulting copolymer (Str-co-Benz) was characterized by FTIR, TGA, DSC, and SEM and used at laboratory scale. The oil spill cleanup process was conducted using a crude oil-natural seawater system under different adsorption conditions such as oil concentration, adsorbent dose, agitation time and speed. Equilibrium studies were performed to determine the capacity of the prepared materials for crude oil adsorption. Langmuir and Freundlich adsorption models were used to describe the experimental isotherms. The reliability of the data was examined and evaluated via application of response surface methodology program. The results showed that oil adsorption followed a pseudo-second-order kinetic model and fitted well with Langmuir model with a maximum adsorption capacity of 10.989 and 12.786 g/g for Str and (Str-co-Benz), respectively. Overall, the modified wheat husk is an effective platform for removing oil from marine ecosystems due to low cost, biodegradability, simple synthesis and fast removal. Moreover, the resulted solid can be used as a fuel in some industrial processes such as steam boilers and brick production incinerators.
“…Enormous industrialization has led to an increasing source of metal working fluids and the disposal of heavy metals into the environment. Metal working fluids are used in industries for a variety of reasons, including extending the life and efficiency of cutting tools, improving surface finish, reducing workpiece thermal deformation and flushing metal fines from the cutting zone [1]. Emulsifiable or watermiscible metal cutting fluids are used as coolants and lubricants in the metal working industries yielding better surface finishes and tool protection from abrasive wear.…”
Metal working fluid industry is the major contributing sources of heavy metals. Their multiple industrial, domestic, and technological applications have led to their wide distribution in the environment, raising concerns over their potential effects on human health and the environment. Filtration technology is widely used to remove contaminants such as heavy metals because it is a low-cost wastewater treatment device that uses physical methods that are simple and effective. In this study, coconut composite activated carbon (CCAC) filter media has been explored for its adsorption abilities towards copper and zinc solutions from metal working fluids. The characteristic of CCAC was investigated using XRF analyser, SEM and FTIR analysis. This study described the performance of fixed-bed column filtration by using CCAC as the filter media under the effect of various bed heights (10,30,50 cm) and initial concentration of copper and zinc (10 and 20 mg/L) to assess the breakthrough curve. The results show that the CCAC surface is not smooth and porous, with many channels. It is connected to hydrogen linked, O-H and contains the highest value composition in MgCO3 and CaCO3, which enhances metal precipitation removal of heavy metals. From the fixed-bed column study, the column with an initial copper and zinc concentration of 10mg/L and a bed height of 50 cm performed well in removing copper and zinc from synthetic copper and zinc solutions. The breakthrough and exhaustion times were less than 30 minutes and 3660 minutes for copper and zinc were less than 30 minutes and 3420 minutes respectively. The longer the lifespan of filter media, the better the filter media for heavy metal treatment. In conclusion, CCAC filter media was used as an alternative to the existing wastewater treatment process to remove copper and zinc from metal working fluids. It also can be applied in the current filtration system, especially for industrial Wastewater Treatment Plant (WWTP).
“…For instance, the electrochemical method could be combined with membrane filtration [20,21]. Another work from Kaur and Sodhi reported treating cutting emulsion by adsorption from the agricultural waste [22]. Su et al reported that a combination of flocculation and absorption by the heterogeneous Fenton system could remove 99.8% of chemical oxygen demand (COD) for wastewater [23].…”
Recently, the disposal of waste oil-in-water cutting emulsion has become an urgent issue because of its extremely high chemical oxygen demand (COD). The present work focuses on treating the waste cutting emulsion generated from the Samsung Thai-Nguyen factory in Vietnam. This work used multistage methods to treat the waste cutting emulsion to meet the wastewater disposal requirement and characterize the oil recovered. The multistage methods consist of the flocculation method (stage 1) and Fenton oxidation (stage 2). The wastewater after stage 1 treatment has a COD reduction efficiency of 98.24% at the condition of pH 5, Al2(SO4)3 2 g/L, C-PAM 12 mg/L, stirring speed 50 rpm, and stirring time 15 minutes. At that condition, the COD value decreased from 147200 mg/L to 2484 mg/L. After stage 2, the COD value further decreased from 2484 mg/L to 85.4 mg/L with total COD removal efficiency increasing to 99.9% at the optimum conditions of pH 3, H2O2 : FeSO4 concentration ratio of 10 : 1, and FeSO4 concentration of 14.04 g/L. After the stage 2 treatment, the wastewater with the COD value of 85.4 mg/L and BOD5 value of 30 mg/L satisfied the Vietnam standard grade B and grade A, respectively, for industrial wastewater. The oil recovered from the treatment has a heating value of 38095 ± 8 kJ/kg, and thus, it could be reusable as fuel gas.
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