The effect of mixed oxidants and powdered activated carbon on the removal of natural organic matter

Álvarez-Uriarte, Jon I.; Iriarte‐Velasco, Unai; Chimeno-Alanís, Noemí; González‐Velasco, Juan R.

doi:10.1016/j.jhazmat.2010.05.028

Cited by 31 publications

(14 citation statements)

References 26 publications

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“…Overall, 56 W photolytic experiments showed highest removal for TS, TVS and BOD as the reaction time increased to 240 min as compared to 14 W, which is attributed to the release of more hydroxyl ions with time that stimulated the degradation of organics. On the other hand, this observation is in good agreement with the previous photocatalysis studies conducted in the absence of catalyst for methylene blue and phenolic syntan degradation [5,[17][18][19][20][21][22].…”

Section: Photodegradation Experimentssupporting

confidence: 92%

“…Photodegradation efficiency was improved when the activated carbons themselves are used as catalysts, pointing out the ability of carbon materials in generating similar or higher quantity of hydroxyl radicals under UV irradiation in the absence of titania. The results suggested the occurrence of carbon-photon interactions which might be propagated through the graphene sheets of the materials, and could reach the adsorbed molecules inside the pores [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 96%

“…Also, the TiO 2 /AC system displayed higher catalytic activity than AC alone under MW irradiation. Therefore, AC-immobilized TiO 2 (AC-TiO 2 ) was used in several studies taking into account the combined effect of adsorption property of AC and the photocatalytic decomposition by TiO 2 [3][4][5][6][7][8]12,[18][19][20][21][22][23]. Consequently, AC-TiO 2 has been receiving special attention in the industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…In the recent years, granular AC-immobilized TiO 2 (GAC-TiO 2 ) photocatalyst has been receiving huge importance in water/wastewater treatment considering easy separation of the catalyst and cheaper cost in their preparation [17,[24][25][26]. On the other hand, the efficiency of powdered AC-immobilized TiO 2 (PAC-TiO 2 ) was also studied by some researchers [7,12,22,27]. However, GAC-TiO 2 photocatalysis was not applied for real-time poultry wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of poultry wastewater using activated carbon-supported titanium dioxide

Asha

Kumar

2015

Desalination and Water Treatment

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A B S T R A C TPhotocatalytic degradation of real-time poultry wastewater was investigated in a lab-scale batch reactor equipped with low-pressure submergible UV lamp(s). The experiments were conducted using slurry TiO 2 (Slurry-TiO 2 ) and activated carbon (AC)-supported TiO 2 (granular and powdered), i.e. GAC-TiO 2 and PAC-TiO 2 . The TiO 2 coatings on the GAC and PAC surfaces were confirmed by using scanning electron microscopy coupled with energy dispersive spectroscopy.Among the systems investigated, GAC-TiO 2 and PAC-TiO 2 photocatalytic systems produced 100% total solids, total volatile solids and biochemical oxygen demand (BOD) removals under 14 W and 56 W UV irradiation within 180 min of reaction. In contrast, complete destruction of organics was not achieved in the photolytic experiments conducted with 56 W UV irradiation even after 240 min of reaction. The firstorder reaction kinetics was adopted to estimate and compare the rate of BOD removal in the systems. A maximum BOD removal rate constant of 0.987 min −1 and a maximum BOD removal rate of 320 mg/L/min were observed in 56 W GAC-TiO 2 system. The BOD removal rate observed in 14 W GAC-TiO 2 (227 mg/L/min) and PAC-TiO 2 (247 mg/L/min) systems were comparable; however, GAC-TiO 2 was recovered effectively compared to PAC-TiO 2 . At the same time, photocatalytically treated poultry wastewater using both GAC-TiO 2 and PAC-TiO 2 was found to be free from coliforms.

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Section: Photodegradation Experimentssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic degradation of poultry wastewater using activated carbon-supported titanium dioxide

Asha

Kumar

2015

Desalination and Water Treatment

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“…Considering that, with EGMO disinfection the toxicity concerns are similar to those of typical chlorine disinfection. The overall disinfectant dosage of EGMO technique is also quantified in terms of FRC [42,47,48].…”

Section: Egmomentioning

confidence: 99%

Disinfection Methods for Swimming Pool Water: Byproduct Formation and Control

Ilyas¹,

Masih

Hoek

2018

Water

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This paper presents a comprehensive and critical comparison of 10 disinfection methods of swimming pool water: chlorination, electrochemically generated mixed oxidants (EGMO), ultraviolet (UV) irradiation, UV/chlorine, UV/hydrogen peroxide (H 2 O 2 ), UV/H 2 O 2 /chlorine, ozone (O 3 )/chlorine, O 3 /H 2 O 2 /chlorine, O 3 /UV and O 3 /UV/chlorine for the formation, control and elimination of potentially toxic disinfection byproducts (DBPs): trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), trihaloacetaldehydes (THAs) and chloramines (CAMs). The statistical comparison is carried out using data on 32 swimming pools accumulated from the reviewed studies. The results indicate that O 3 /UV and O 3 /UV/chlorine are the most promising methods, as the concentration of the studied DBPs (THMs and HANs) with these methods was reduced considerably compared with chlorination, EGMO, UV irradiation, UV/chlorine and O 3 /chlorine. However, the concentration of the studied DBPs including HAAs and CAMs remained much higher with O 3 /chlorine compared with the limits set by the WHO for drinking water quality. Moreover, the enhancement in the formation of THMs, HANs and CH with UV/chlorine compared with UV irradiation and the increase in the level of HANs with O 3 /UV/chlorine compared with O 3 /UV indicate the complexity of the combined processes, which should be optimized to control the toxicity and improve the quality of swimming pool water.

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Ferric sulfate coagulation and powdered activated carbon adsorption as simultaneous treatment to reuse the medium in Arthrospira platensis cultivation

Morocho‐Jácome

Sato

Carvalho

2015

J of Chemical Tech & Biotech

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BACKGROUND: Cyanobacteriae and microalgae industries require large amounts of water for their cultivation. Reusing the Arthrospira platensis culture medium is scarcely evaluated in the literature. This work evaluates coagulation and adsorption as a simultaneous process to treat A. platensis spent medium by applying different concentrations of powdered activated carbon (PAC) and ferric sulfate (S) and by using different contact times (T) to remove organic matter and pigments. RESULTS:The process efficiency was measured by removal of both organic matter and pigments by absorbance at 254 and 440 nm, respectively. The highest maximum cell concentration (4863 ± 64 mg L −1 ) and protein content values (60.0 ± 0.6%) were observed in a medium treated with optimal conditions using PAC = 40.0 mg L −1 , S = 32.8 mg L −1 and T = 36.1 min. Under such conditions, chlorophyll-a biomass content of 24.5 ± 0.6 mg g dry cell −1 and chlorophyll-a productivity of 16.8 ± 0.1 mg L −1 d −1 were obtained.CONCLUSIONS: Coagulation and adsorption as a simultaneus treatment allowing reuse of the spent medium of A. platensis cultivation can diminish not only its production costs but also environmental pollution. The biomass produced in the treated medium contains more protein and chlorophyll than that produced in the standard medium.

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The effect of mixed oxidants and powdered activated carbon on the removal of natural organic matter

Cited by 31 publications

References 26 publications

Photocatalytic degradation of poultry wastewater using activated carbon-supported titanium dioxide

Photocatalytic degradation of poultry wastewater using activated carbon-supported titanium dioxide

Disinfection Methods for Swimming Pool Water: Byproduct Formation and Control

Ferric sulfate coagulation and powdered activated carbon adsorption as simultaneous treatment to reuse the medium in Arthrospira platensis cultivation

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