Treatment of 2,4-Dichlorophenol by Solar Photocatalysis: Comparison of Coupled Photocatalytic-Active Carbon vs. Active Carbon

2000 ◽  
Vol 123 (2) ◽  
pp. 138-142 ◽  
Author(s):  
Sixto Malato ◽  
Julia´n Blanco ◽  
Pilar Ferna´ndez-Iba´n˜ez ◽  
Julia Ca´ceres
Keyword(s):  
Organic Carbon ◽  
Solar Radiation ◽  
Total Organic Carbon ◽  
Active Carbon ◽  
Pilot Plant ◽  
Photocatalytic Oxidation ◽  
Practical Application ◽  
Carbon Adsorption ◽  
Pilot Plant Scale ◽  
Slow Kinetic

The photocatalytic oxidation of 2,4-Dichlorophenol (DCP), using TiO2 suspensions under solar radiation, has been studied at pilot-plant scale at the Plataforma Solar de Almerı´a (PSA). This compound is used as a model to demonstrate the practical application of the treatment. Total Organic Carbon (TOC) analysis is applied to confirm the total mineralization of the contaminants. The pilot plant has a volume of 247 L and consists of 9 m2 of CPC modules (with transparent tubes) connected to a recirculation tank. DCP at 20, 50 and 200 mg/L is completely photodegraded in the presence of 200 mg/L of TiO2, but mineralization is slow when organics concentration is small. The results obtained from these experiments have been used to decide the dimensions of a solar photocatalytic plant for treating wastewater contaminated with different concentration of DCP. Due to the slow kinetic obtained in the photodegradation last steps, a combination with GAC treatment is proposed. Besides, this article attempts to compare the advantages, disadvantages and costs of photocatalytic treatment, versus other more conventional technologies such as active carbon adsorption.

TiO2 photocatalysis under natural solar radiation for the degradation of the carbapenem antibiotics imipenem and meropenem in aqueous solutions at pilot plant scale

2019 ◽  
Vol 166 ◽  
pp. 115037 ◽  
Author(s):  
Alejandro Cabrera-Reina ◽  
Ana B. Martínez-Piernas ◽  
Yannis Bertakis ◽  
Nikolaos P. Xekoukoulotakis ◽  
Ana Agüera ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Aqueous Solutions ◽  
Pilot Plant ◽  
Tio2 Photocatalysis ◽  
Pilot Plant Scale ◽  
Natural Solar Radiation

Photocatalytic oxidation of six endocrine disruptor chemicals in wastewater using ZnO at pilot plant scale under natural sunlight

2018 ◽  
Vol 25 (35) ◽  
pp. 34995-35007 ◽  
Author(s):  
Nuria Vela ◽  
May Calín ◽  
María J. Yáñez-Gascón ◽  
Isabel Garrido ◽  
Gabriel Pérez-Lucas ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Endocrine Disruptor ◽  
Photocatalytic Oxidation ◽  
Natural Sunlight ◽  
Endocrine Disruptor Chemicals ◽  
Pilot Plant Scale

A Comparative Study of Supported TiO2 as Photocatalyst in Water Decontamination at Solar Pilot Plant Scale

2005 ◽  
Vol 128 (3) ◽  
pp. 331-337 ◽  
Author(s):  
Mahmut Kus ◽  
Wolfgang Gernjak ◽  
Pilar Fernández Ibáñez ◽  
Sixto Malato Rodríguez ◽  
Julián Blanco Gálvez ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Organic Compounds ◽  
High Performance ◽  
Sol Gel ◽  
Silver Deposition ◽  
Force Microscopy ◽  
Glass Tubes ◽  
Degussa P25 ◽  
Pilot Plant Scale

The degradation of gallic acid and imidacloprid with supported Millennium PC500 and Degussa P25 TiO2 is reported. TiO2 particles were immobilized using a titanium sol-solution and direct deposition on glass supports. The film characterization was done by x-ray diffraction, scanning electron microscopy, and atomic force microscopy, and degradation of organic compounds was monitored by high-performance liquid chromatography, total organic carbon analyzer, and ion chromatography. The experiments were performed under sunlight in compound parabolic collector plants with flat supports inside the glass tubes. Photocatalytic activity of the films was compared and identified. Although sol-gel coatings had better mechanical properties, mineralization was observed to be approximately five times slower than paste-deposited films. Photoactivity of the films decreased with silver deposition due to the nature of the organic compounds. The rate constants were calculated to be between 2×10−1 and 6×10−2mgm2∕kJ for organic compounds, and 6×10−2 and 6×10−3 for total organic carbon.

Low-concentrating CPC collectors for photocatalytic water detoxification: comparison with a medium concentrating solar collector

1997 ◽  
Vol 35 (4) ◽  
pp. 157-164 ◽  
Author(s):  
S. Malato ◽  
J. Blanco ◽  
C. Richter ◽  
D. Curcó ◽  
J. Giménez
Keyword(s):  
Solar Radiation ◽  
Solar Collector ◽  
Photocatalytic Oxidation ◽  
Decomposition Reaction ◽  
The Sun ◽  
Parabolic Trough ◽  
Advantages And Disadvantages ◽  
Compound Parabolic Concentrator ◽  
Pilot Plant Scale ◽  
Water Detoxification

The photocatalytic oxidation of 2,4-Dichlorophenol (DCP), using TiO2 suspensions under solar radiation, has been studied at pilot-plant scale at the Plataforma Solar de Almería (PSA). Two different reactor designs were tested: a medium concentrating radiation system called a Parabolic-Trough-Collector Reactor, PTCR, equipped with two motors (azimuth and elevation) to adjust the position of the module perpendicular to the sun, and a low-concentrating radiation system, the Compound-Parabolic-Concentrator Reactor, CPCR, facing south and inclined 37 degrees. Substrates were dissolved in water to required mg L−1 levels in a reservoir tank. In both cases, 0.2 g L−1 of the suspended TiO2 catalyst was used in a 250 L solution of the contaminant, which was recirculated through the photoreactors using a centrifugal pump and an intermediate reservoir tank. The advantages and disadvantages of the two types of photoreactors in DCP oxidation are compared and discussed. The strong potential of photocatalytic peroxydisulphate-assisted degradation in high DCP concentrations was demonstrated in both systems, and chemical actinometry (the decomposition reaction of oxalic acid by radiated uranyl salts) in the CPC reactor is compared with the results obtained in the PTC.

CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Markus Heryanto Langsa
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Total Organic Carbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Pinus Radiate

<p>Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (<em>wandoo eucalyptus </em>and <em>pinus radiate, conifer</em>) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).</p><p>Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV<sub>254</sub> disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.</p>

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