COD removal from landfill leachate using a high-performance and low-cost activated carbon synthesized from walnut shell

Mahdavi, Ahmad Reza; Ghoresyhi, A. A.; Rahimpour, Ahmad; Younesi, Habibollah; Pirzadeh, Kasra

doi:10.1080/00986445.2018.1441831

Cited by 31 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The adsorption method of bleaching mainly absorbs and removes the pigments and impurities in the oil through the surface action of the adsorbent. , The adsorption mechanism works by the combined actions of physical adsorption and chemical adsorption. Physical adsorption often occurs during low-temperature bleaching processes and relies on intermolecular forces between surface groups of the adsorbent and the pigment to form single- and multilayer selective mixed adsorption, which requires low activation energy. − Chemical adsorption often occurs during high-temperature processes. The unevenness of the atoms on the surface of the adsorbent leads to the asymmetry of the gravitational force on the surface of the adsorbent, and thus, the surface molecules have a certain free energy, thereby adsorbing certain substances, causing the free energy to decrease.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

et al. 2020

View full text Add to dashboard Cite

Walnut shell biochar (WSC) and wood powder biochar (WPC) prepared using the limited oxygen pyrolysis process were used as raw materials, and ZnCl2, KOH, H2SO4, and H3PO4 were used to modify them. The evaluation of the liquid-phase adsorption performance using methylene blue (MB) as a pigment model showed that modified biochar prepared from both biomasses had a mesoporous structure, and the pore size of WSC was larger than that of WPC. However, the alkaline modified was more conducive to the formation of pores in the biomass-modified biochar materials; KOH treatment resulted in the highest modified biochar-specific surface area. The isothermal adsorption of MB by the two biomass pyrolysis charcoals conformed to the Freundlich equation, and the adsorption process conformed to the quasi-second-order kinetic equation, which is mainly physical adsorption. The large number of oxygen-containing functional groups on the particle surface provided more adsorption sites for MB adsorption, which was beneficial to the adsorption reactions. The adsorption effects of woody biomass were obviously higher than that of shell biomass, and the adsorption capacities of the two raw materials’ pyrolysis charcoal were in the order of WPC > WSC. The adsorption effects of different treatment reagents on MB were in the order ZnCl2 > KOH > H3PO4 > H2SO4. The maximum adsorption capacities of the two biomass treatments were 850.9 mg/g for WPC with ZnCl2 treatment and 701.3 mg/g for WSC with KOH treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This phenomenon occurs as a result of a partial aggregation of the adsorbent particles. Therefore, the available adsorption sites cannot be saturated with the adsorbates [8].…”

Section: Effect Of Adsorbent Dosagesmentioning

confidence: 99%

“…The pH of the solution affects the degree of ionisation and the surface charge of the adsorbent. According to Mahdavi et al, the COD is amongst the pollutants affected by the pH of the solution [8]. The wastewater influent has a fluctuation of pH as it receives both industrial and domestic wastewater.…”

Section: Effect On Ph On Cod Removal Efficiencymentioning

confidence: 99%

“…Their study also suggested that as the initial pH solution increases, the electrostatic repulsion between Bisphenol A and the sorbent becomes stronger. Due to the greater electrostatic repulsion from OHions, the binding affinity of the sorbent is lower as the overall charge of the sorbent surface gets more negative [8]. Therefore, this led to a low percentage of removal and adsorption capacity of Bisphenol A by the adsorbents under alkaline conditions [9].…”

Section: Figure 6 Cod Removal With Different Ph Of Wastewatermentioning

confidence: 99%

See 1 more Smart Citation

Removal of pollutants from wastewater using activated carbon from durian peel

Musthapa

Shams

Prasad

2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

The efforts in reducing food waste can lead to better water management with less land required for food production and indirectly having a positive impact on the livelihoods and the environment. In order to support the practice of reducing food waste in Brunei Darussalam, one must find ways to recycle or reuse them, particularly waste generated from fruit peels. This paper investigates the feasibility of utilising Durian (Durio zibethinus) rinds to remove pollutants in wastewater, namely Chemical Oxygen Demand (COD), and Nitrates by the process called adsorption. Durian is a local fruit and has high consumption in the country. Hence, it produces a large amount of waste, particularly in the form of peels or rinds. In the present research, the fruit peels are treated by dehydration and carbonisation method prior to utilisation. The variable parameters will be investigated such as the effect on particle size, adsorbent dosage, pH, contact time, and agitation. The maximum COD removal percentage was found to be 68.2 % with an adsorption capacity of 690 mg/g. Overall, carbonised samples gave a better outcome than dehydrated samples. Possibly due to the presence of a unique pore structure in carbonised samples that allows organic matter to be adsorbed on the surface.

show abstract

“…Outcomes showed that 71% COD removal was achieved after 8 h of contact time with an AC concentration of 20 g L −1 . Mahdavi et al (2018) studied the effectiveness of synthesized activated carbon for organic matter and trace metal removal. Their findings revealed that an adsorbent dosage of 15 g L −1 led to the removal of 84.7% of the COD at pH 4.…”

Section: Activated Carbonmentioning

confidence: 99%

Recent technologies for leachate treatment: a review

Cherni

Elleuch

Messaoud

et al. 2021

Euro-Mediterr J Environ Integr

View full text Add to dashboard Cite

Municipal solid waste leachate, a kind of wastewater, can severely damage the environment and contaminate the groundwater because of its high organic matter and toxic heavy metal concentrations. Due to its complex composition, this wastewater must be properly treated prior to being discharged into the environment. In recent decades, several biological approaches (e.g., bioremediation, phytoremediation, and bioreactors) and physicochemical processes (e.g., coagulation/flocculation, air stripping, and advanced oxidation processes) have proven effective at removing the organic load and the toxicity of this effluent. Physicochemical treatments have been applied as pretreatment or post-treatment steps for biological processes, but these methods do not always provide satisfactory results and can cause secondary pollution in some cases. In addition, owing to the high concentrations of organic matter, ammonia, and trace metals in landfill leachate, combined approaches to leachate treatment have been reported to be efficient. This article highlights the advantages and drawbacks of these approaches to the treatment of leachate by providing an updated overview of the various methods that have been successfully applied in this field. Further studies should focus on improving landfill leachate treatment to maximize removal performance.

show abstract

COD removal from landfill leachate using a high-performance and low-cost activated carbon synthesized from walnut shell

Cited by 31 publications

References 31 publications

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

Removal of pollutants from wastewater using activated carbon from durian peel

Recent technologies for leachate treatment: a review

Contact Info

Product

Resources

About