Simultaneous removal of organics and metals in fixed bed using gravel and iron oxide coated gravel

Sızırıcı, Banu; Yildiz, İbrahim

doi:10.1016/j.rineng.2019.100093

Cited by 19 publications

(16 citation statements)

References 35 publications

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“…The amount of total adsorbed COD increased with the increasing bed height as shown in Table 2. Similar observations have been reported by other researchers [27,31]. Some other studies reporting microorganism immobilized on different carriers showed higher COD removals than our study findings.…”

Section: Fixed-bed Column Experimentssupporting

confidence: 93%

“…The average COD removal efficiency was 36.35% for 0.5X wastewater, whereas the COD removal efficiency decreased to 15.5 % with 1X wastewater. This indicates that organic compounds saturate the binding sites immediately, and the performance deteriorates accordingly [27]. The total adsorbed COD was high for systems with high inlet COD concentration as shown in Table 1.…”

Section: Fixed-bed Column Experimentsmentioning

confidence: 95%

“…An established protocol was adopted to prepare the synthetic wastewater samples [24][25][26][27]. All the measurements were run at pH 7 adjusted by using NaOH or HCl solutions.…”

Section: Synthetic Wastewater Preparationmentioning

confidence: 99%

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Organic matter removal via activated sludge immobilized gravel in fixed bed reactor

Sızırıcı

Yildiz

2020

E3S Web Conf.

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In this study, the adsorption capability of the activated sludge immobilized gravel as a low-cost and efficient adsorbent to remove organic matter in terms of chemical oxygen demand (COD) from synthetic wastewater was investigated using fixed bed columns. The effects of parameters including column pack height and influent COD concentrations on removal efficiencies were assessed through breakthrough curves. It was found that the removal efficiency increased when fixed bed height was increased and influent COD concentration was decreased. The maximum COD removal rate of 36.35%, was obtained for a medium-strength wastewater sample with 1166 mg/L of COD concentration when the bed height was 2 cm, and the flow rate was 11 mL/min. Activated sludge immobilized gravel can be utilized as a low cost bio-filter to remove organic material from wastewater.

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Section: Fixed-bed Column Experimentssupporting

confidence: 93%

Section: Fixed-bed Column Experimentsmentioning

confidence: 95%

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Organic matter removal via activated sludge immobilized gravel in fixed bed reactor

Sızırıcı

Yildiz

2020

E3S Web Conf.

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“…When the pH of the solution increases, metals ions become less soluble and start to precipitate as metal hydroxide. As the pH of solution increases, zinc presents as Zn 2+ at pH < 8.8 and presents as zinc hydroxides at pH > 8.8 [56]. Copper presents as Cu 2+ at pH < 5.8 and presents as copper hydroxide at pH > 5.8 [57].…”

Section: Activated Carbon 322mentioning

confidence: 99%

The effect of pyrolysis temperature and feedstock on date palm waste derived biochar to remove single and multi-metals in aqueous solutions

Sızırıcı

Fseha

Yildiz

et al. 2021

Sustain Environ Res

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In this study, leaf and frond date palm waste as feedstock was used to derive biochars. The effects of pyrolysis temperatures on their physical and chemical properties, and their capacity to remove copper, iron, nickel and zinc from single and multi-metal solutions at various pH values were investigated. Analytical and spectroscopic techniques such as scanning electron microscopy, energy dispersive X-ray, Fourier transform infrared spectroscopy, X-ray diffraction, carbon, hydrogen, nitrogen, sulfur elemental analysis, Brunauer Emmett Teller analysis were conducted for characterization. The pore volume, surface area, pH, and total carbon content of date palm leaf and frond biochar increased while functional groups and hydrogen, nitrogen and oxygen content of biochar decreased with increasing pyrolysis temperature compared to feedstock. The removal efficiencies and sorption capacity for single and mixed metal ions were found between 98 and close to 100% and 2.4 and 3.0 mg g− 1 by leaf and frond biochar samples at pH > 6, respectively. Biochar obtained from different feedstock at different pyrolysis temperature did not show any statistically significant improvements on the removal of single or mixed metals from aqueous solutions. The date palm leaf or frond biochar obtained at low pyrolysis temperature is as effective to remove metals as the ones obtained at high pyrolysis temperatures. Therefore, to consume less energy to produce biochar at lower temperature which exhibits same effective removal efficiency will be a win-win solution in terms of sustainability and economy. As a result, date palm waste biochar can be effectively used to remove metals in water and wastewater.

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“…Gravel has a wide range of sources and low cost. It is one of the most widely used substrates in experiments and engineering at home and abroad [28].…”

Section: Comparison With Other Constructed Wetland Substratesmentioning

confidence: 99%

Preparation of a New Iron-Carbon-Loaded Constructed Wetland Substrate and Enhanced Phosphorus Removal Performance

2020

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Iron-carbon substrates have attracted extensive attention in water treatment due to their excellent processing ability. The traditional iron-carbon substrate suffers from poor removal effects, separation of the cathode and anode, hardening, secondary pollution, etc. In this study, a new type of iron-carbon-loaded substrate (NICLS) was developed to solve the problems of traditional micro-electrolytic substrates. Through experimental research, a preparation method for the NICLS with Fe and C as the core, zeolite as the skeleton, and water-based polyurethane as the binder was proposed. The performance of the NICLS in phosphorus-containing wastewater was analyzed. The results are as follows: The optimal synthesis conditions of the NICLS are 1 g hydroxycellulose, wood activated carbon as the cathode, an activated carbon particle size of 200-60 mesh, and an Fe/C ratio of 1:1. Acidic conditions can promote the degradation of phosphorus by the NICLS. Through the characterization of the NICLS (scanning electron microscope (SEM), X-ray diffractometer (XRD), and energy-dispersive spectrometer (EDS), etc.), it is concluded that the mechanism of the NICLS phosphorus removal is a chemical reaction produced by micro-electrolysis. Using the NICLS to treat phosphorus-containing wastewater has the advantages of high efficiency and durability. Therefore, it can be considered that the NICLS is a promising material to remove phosphorus.

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Simultaneous removal of organics and metals in fixed bed using gravel and iron oxide coated gravel

Cited by 19 publications

References 35 publications

Organic matter removal via activated sludge immobilized gravel in fixed bed reactor

Organic matter removal via activated sludge immobilized gravel in fixed bed reactor

The effect of pyrolysis temperature and feedstock on date palm waste derived biochar to remove single and multi-metals in aqueous solutions

Preparation of a New Iron-Carbon-Loaded Constructed Wetland Substrate and Enhanced Phosphorus Removal Performance

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