Photoremediation of natural leachate from a municipal solid waste site in a pilot-scale bubble column reactor

Qazaq, Amjad Saleh; Hudaya, Tedi; Lee, I.A.L.; Sulidis, A.; Adesina, Adesoji A.

doi:10.1016/j.catcom.2007.03.005

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Sama Azadi et al [38] also confirmed this conclusion. It is speculated that the reason for a COD removal rate that is higher than the chromaticity removal rate is due to low phenolic substances in the reaction process, as color reduction simply reflects the oxidative opening benzene ring in the phenolic substances to other straight chain compounds [39]. The result is consistent with the removal rate of COD and color treated by AC/TiO 2 for the last 30 min [40].…”

Section: Optimization Of Photocatalytic Processessupporting

confidence: 64%

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

et al. 2021

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This study explored the performance of TiO2 nanoparticles in combination with aged waste reactors to treat landfill leachate. The optimum conditions for synthesis of TiO2 were determined by a series of characterizations and removal rates of methyl orange. The effect of the ultraviolet irradiation time, amount of the catalyst, and pH on the removal efficiency for the chemical oxygen demand (COD) and color in the leachate was explored to determine the optimal process conditions, which were 500 min, 4 g/L and 8.88, respectively. The removal rates for COD and chroma under three optimal conditions were obtained by the single factor control method: 89% and 70%; 95.56% and 70%; and 85% and 87.5%, respectively. Under optimal process conditions, the overall average removal rates for ammonium nitrogen (NH4+–N) and COD in the leachate for the combination of TiO2 nanoparticles and an aged waste reactor were 98.8% and 32.5%, respectively, and the nitrate (NO3−–N) and nitrite nitrogen (NO2–N) concentrations were maintained at 7–9 and 0.01–0.017 mg/L, respectively. TiO2 nanoparticles before and after the photocatalytic reaction were characterized by emission scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and Fourier transform infrared spectrometry. In addition, TiO2 nanoparticles have excellent recyclability, showing the potential of the photocatalytic/biological combined treatment of landfill leachate. This simulation of photocatalysis-landfilling could be a baseline study for the implementation of technology at the pilot scale.

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Section: Optimization Of Photocatalytic Processessupporting

confidence: 64%

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

et al. 2021

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“…This involves some type of treatment process whether on or off-site. The various methods and technologies tested, applied and proposed for the treatment of landfill leachate range from the recirculation of leachate through the landfill to the more sophisticated combination of physical, chemical and biological processes (Chen et al 2008;Altin 2008;Qazaq et al 2007;Robinson 2007;Kurniawan et al 2006). To secure a successful and efficient treatment option, it must be borne in mind that the characteristics of leachate undergo temporal and spatial variation, thus flow equalization is very important (Kulikowska and Klimiuk 2008).…”

Section: Introductionmentioning

confidence: 99%

Performance of struvite precipitation during pretreatment of raw landfill leachate and its biological validation

Barnes

Chen

2009

Environ Chem Lett

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Treatment of landfill leachate is a worldwide problem at present. A pretreatment process, struvite MgNH 4 PO 4 Á6H 2 O precipitation, was developed to treat raw landfill leachate, and its performance was biologically validated in this manuscript. During the struvite precipitation, the suitable operating pH was 9 with 97.8% NH 4 ? -N removal. It was found that temperature had no significant effect on the treatment efficiency of struvite precipitation, but clearly affected COD removal and BOD/COD ratio. At 40°C, NH 4 ? -N removal, COD removal and BOD/COD ratio were above 95, 56 and 0.70%, respectively. The X-ray diffraction analysis verified that the precipitate formed mainly was struvite and other compounds of phosphor may be formed accompanying the struvite production. In membrane bioreactor system, the average MLVSS/MLSS ratio of 0.55 characterized the operation at 24 h HRT had a surge to 0.69 during HRT of 12 h. These indicated that the struvite-pretreated leachate could provide benefits.

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“…The fountain photocatalytic reactor 14 is another configuration building on the conventional slurry reactor design that combines minimal mass-transfer limitations and no reactor wall deposits, with a very large illumination surface area per unit catalyst suspension volume. More recently, Qazaq et al 15 utilized a bubble column reactor to investigate the photoremediation of a municipal solid waste muddy, brownish leachate.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reactor Employing Titanium Dioxide: From a Theoretical Model to Realistic Experimental Results

Romero

Alfano

Cassano

2009

Ind. Eng. Chem. Res.

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The performance of a reacting system for degradation of trichloroethylene (TCE) in a pilot-size annular photocatalytic reactor having a tubular lamp located at its centerline was studied. The reactor operation was carried out with commercial catalytic particles of titanium dioxide (Aldrich) in a water suspension. The description of the reactor performance was made by employing a kinetic model developed in a laboratory reactor of different size and configuration, irradiated with similar lamps of lower output power. The annular reactor was operated in the continuous mode but inside the loop of a recirculation system.The performance of the annular reactor was modeled by assuming three different behaviors: (i) a well-stirred tank reactor, (ii) a pseudo-steady-state laminar flow reactor in a batch recycle, and (iii) a transient-state laminar flow reactor in a recycle. Case iii produced the best representation of the experimental data. Along with the experimental validation of the developed theoretical models, three practical features were unveiled that had to be taken into account in any subsequent design: (a) an important change in the pH, from 6.5 to 3.5, along the reaction time; (b) a significant titanium dioxide deposition on the reactor walls; and (c) an appreciable catalyst agglomeration produced by the recirculation system and magnified by the change in pH. Only after the first 120 min of reaction time, the reactor conditions became almost stabilized; thus, the observed transformations had to be incorporated into the modeling.

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Photoremediation of natural leachate from a municipal solid waste site in a pilot-scale bubble column reactor

Cited by 6 publications

References 6 publications

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

Performance of struvite precipitation during pretreatment of raw landfill leachate and its biological validation

Photocatalytic Reactor Employing Titanium Dioxide: From a Theoretical Model to Realistic Experimental Results

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