Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Işıl Akmehmet Balcıoğlu ◽  
Çiğdem Kıvılcımdan Moral
Keyword(s):  
Activated Carbon ◽  
Treatment Method ◽  
Catalytic Ozonation ◽  
Pulp And Paper ◽  
Production Plant ◽  
Pulp Bleaching ◽  
Heterogeneous Catalytic ◽  
Promising Treatment ◽  
Water And Wastewater ◽  
Granulated Activated Carbon

AbstractCatalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe

scholarly journals Homogeneous and heterogeneous catalytic ozonation of endosulfan with activated carbon as catalyst

2018 ◽  
Vol 6 (3) ◽  
pp. 676
Author(s):  
E Enjarlis ◽  
Setijo Bismo ◽  
S Slamet ◽  
Roekmijati W Soemantojo
Keyword(s):  
Activated Carbon ◽  
Environmental Concern ◽  
Heterogeneous Reaction ◽  
Organic Pollutant ◽  
Catalytic Decomposition ◽  
Decomposition Reaction ◽  
Catalytic Ozonation ◽  
Heterogeneous Catalytic ◽  
Neutral Ph ◽  
Organic Chlorine

Homogeneous and heterogeneous  catalytic ozonation of endosulfan with activated carbon as catalystCatalytic ozonation of endosulfan with the presence of activated carbon as catalyst was investigated at neutral pH and different temperatures. The model kinetics was developed based on the mechanism of catalytic decomposition ozone, namely homogeneous and heterogeneous decomposition reaction. This study focuses on determining the contribution of homogeneous and heterogeneous reaction to endosulfan removal in catalytic ozonation with activated carbon as catalyst. Endosulfan was selected as a target of study because it is organic pollutant and organic chlorine pesticide (OCPs) groups that may cause a serious environmental concern. The use of activated carbonfrom Bogar Forest Centre actually provides a slightly contribution in enhancing endosulfan oxidation reaction with ozone. This is because endosulfan has sulfide group or sulfur element that is very reactive to ozone. Even though, the amount of OH increases because of ozonation with activated carbon use. The heterogeneous and homogeneous reaction contributions at  neutral  pH and temperature range of 20- 30oC  were 11-21% and 79- 89% from overall endosulfan removal in catalytic ozonation with promoted by of activated carbon, respectively.Keywords: Activated Carbon, Catalytic Ozonation, Endosulfan AbstrakOzonasi katalitik endosulfan dengan adanya katalis karbon aktif dilakukan pada pH netral dan suhu yang berbeda-beda. Persamaan kinetika reaksi dikembangkan berdasarkan mekanisme reaksi dekomposisi ozon secara katalitik yaitu reaksi homogen dan heterogen. Penelitian ini ditujukan terutama untuk menentukan kontribusi reaksi homogen dan heterogen terhadap penyisihan endosulfan di dalam ozonasi katalitik dengan karbon aktif sebagai katalis.Endosulfan dipilih sebagai sasaran penelitian karena merupakan polutan organik dan kelompok pestisida organoklorida (OCPs) yang menjadi perhatian serius di lingkungan. Karbon aktif yang digunakan berasal dari Balai Hutan Bogar yang ternyata memberikan pengaruh kecil terhadap peningkatan reaksi oksidasi endosulfan dengan ozon. Hal ini disebabkan endosulfan mempunyai gugus sulfida atau sulfur yang sang at reaktif terhadap ozon. Meskipun, jumlah OH meningkat disebabkan penggunaan ozonasi dengan karbon aktf. Kontribusi reaksi homogen dan heterogen terhadap penyisihan endosulfan pada kondisi pH netral dan suhu 20-30 oC  masing-masing sebesar 79- 89% dan 11- 21% dari total penyisihan endosulfan dalam ozonasi katalitik dengan dipromosikan oleh karbon aktifKata kunci: Endosulfan, Karbon Aktif, Ozonasi Katalitik

Anaerobic treatment of organic chemical wastewater using packed bed reactors

2006 ◽  
Vol 54 (10) ◽  
pp. 67-77 ◽  
Author(s):  
P. Mijaylova-Nacheva ◽  
B. Peña-Loera ◽  
S. Cuevas-Velasco
Keyword(s):  
Activated Carbon ◽  
Packed Bed ◽  
Treatment Method ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Organic Chemical ◽  
Methanogenic Activity ◽  
Packed Bed Reactors ◽  
Suitable Treatment ◽  
Granulated Activated Carbon

The studied organic chemical wastewater had a high COD, 20–45 g/L, and low TSS, less than 200 mg/L, making anaerobic bio-filtration a suitable treatment method. The organic matter consisted of alcohols, amines, ketones and aromatic compounds, such as toluene and phenol. Granulated activated carbon (GAC) and a porous stone called tezontle, widely available in Mexico, were used as a bio-film support. Once inoculated, the mesophilic reactors with granulated activated carbon (GAC-BFs) reached stability with 80% COD removal in 40 days, while the reactors with tezontle material (tezontle-BF) required 145 days. Biodegradation of more than 95% was obtained with both support media: at organic loads less than 1.7 kg m−3 d−1 in tezontle-BF and with loads of up to 13.3 kg m−3 d−1 in GAC-BFs. The bio-filters with GAC allowed COD removal efficiency of 80% at a load as high as 26.3 kg m−3 d−1, while the same efficiency with tezontle was obtained at loads up to 4.45 kg m−3 d−1. The use of GAC as support material allows greater biodegradation rates than tezontle and it makes the bio-filters more resistant to organic increases, inhibition effects and toxicity. Methanogenic activity was inhibited at loads higher than 1.7 kg m−3 d−1 in bio-filters with tezontle and 22.8 kg m−3 d−1 in bio-filters with GAC. At loads lower than the previously mentioned, high methane production yield was obtained, 0.32–0.35 m3CH4/kg CODremoved. The biomass growth rates were low in the bio-filters with both kinds of material; however, a sufficiently high biomass holdup was obtained.

scholarly journals Promoted ozonation for the decomposition of 1,4-dioxane by activated carbon

2016 ◽  
Vol 17 (2) ◽  
pp. 613-620 ◽  
Author(s):  
Gui-Peng Tian ◽  
Qian-Yuan Wu ◽  
Ang Li ◽  
Wen-Long Wang ◽  
Hong-Ying Hu
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Traditional Treatment ◽  
Treatment Processes ◽  
Tert Butyl Alcohol ◽  
Water And Wastewater ◽  
The Stability ◽  
The Ideal

Worldwide attention has been attracted to 1,4-dioxane because of its probable human carcinogenicity and frequent occurrence in surface waters and wastewaters. Thus, many countries and organizations have set limits for the amount of this material in drinking water and wastewater effluent. However, the removal of 1,4-dioxane during traditional treatment processes, even ozonation (pH < 7), has been limited. Therefore, 1,4-dioxane removal during catalytic ozonation was investigated in this study, and activated carbon was selected as the ideal catalyst. The removal efficiency of 1,4-dioxane by ozonation was promoted significantly using activated carbon compared with that of ozonation only. Tert-butyl alcohol significantly reduced the removal efficiency of 1,4-dioxane during catalytic ozonation, which suggested that hydroxyl radicals (·OH) were formed during catalytic ozonation and played an important role in decomposing 1,4-dioxane. Additionally, results concerning the stability of activated carbon indicated that the catalytic activity of this catalyst remained steady during ozonation.

scholarly journals Removal of Phenol From Wastewater by High-Gravity Intensified Heterogeneous Catalytic Ozonation With Activated Carbon

2021 ◽  
Author(s):  
jingwen zhang ◽  
shengjuan shao ◽  
xin ding ◽  
zhixing li ◽  
jiaxin jing ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Packed Bed ◽  
Catalytic Ozonation ◽  
High Gravity ◽  
Paramagnetic Resonance ◽  
Heterogeneous Catalytic ◽  
Tertiary Butanol ◽  
Rotating Packed Bed ◽  
Initial Ph

Abstract In this study, the high-gravity technique is used to intensify the heterogeneous catalytic ozonation with activated carbon (AC) as the catalyst for removal of phenol from wastewater in a rotating packed bed (RPB), and the effects of high-gravity factor, inlet O3 concentration, liquid-gas ratio and initial pH on the degradation and mineralization of phenol at room temperature are investigated. It is revealed that the degradation rate of phenol reaches 100% at 10 min and the removal rate of total organic carbon (TOC) reaches 91% at 40 min under the conditions of high-gravity factor β=40, inlet O3 concentration =90 mg·L-1, liquid flow rate =80 L·h-1 and initial pH=11. Compared with the bubbling reactor (BR)/O3/AC and RPB/O3 systems, the mineralization rate of phenol by the RPB/O3/AC system is increased by 24.78% and 34.77%, respectively. Free radical quenching experiments are performed using tertiary butanol (TBA) and benzoquinone(BQ) as scavengers of ·OH and O2·−, respectively. It is shown that the degradation and mineralization of phenol are respectively attributed to the direct ozonation and the indirect oxidation by ·OH generated from the decomposition of O3 adsorbed on AC surface. •OH and O2•− are also detected by electron paramagnetic resonance (EPR). Thus, it is concluded that AC-catalyzed ozonation and high gravity technique had a synergistic effect on •OH initiation, which in turn can significantly improve the degradation and mineralization of organic wastewater.

scholarly journals Possibilities of applying biosorption systems for ballast water treatment

2019 ◽  
pp. 289-298
Author(s):  
Viktoras Racys ◽  
Irmantas Valunas ◽  
Inga Urniezaite
Keyword(s):  
Activated Carbon ◽  
Treatment Method ◽  
Oil Products ◽  
Treatment Efficiency ◽  
Biosorption Process ◽  
Carbon Biomass ◽  
Bilge Water ◽  
Ballast Water Treatment ◽  
Light Oil ◽  
Granulated Activated Carbon

This article represents applying of biosorption process for the treatment of wastewater,contaminated with light oil products, SC "Klaipedos nafta", which works in the field oftransshipment of oil and its products in Lithuania, has installed biosorbers for the treatmentof ballast and bilge water from the vessels, Biosorption process is sustained by integratedrunning of the Granulated Activated Carbon (GAC) and the active branches of particularmicroorganisms, This wastewater treatment method is preeminent for treatment of this kindof wastewater, comparing with the treatment efficiency of other methods, Wastewater ispumped into biosorbers after flotation and remaining concentration of Total PetroleumHydrocarbons (TPH) varies about 2 mg/L At the very beginning of the biosorbers operationwastewater treatment efficiency of 0.2 mg/I was reached, For the process control mainparameters are being analyzed: sorption capacity of the activated carbon, biomass amountand enzymatic activity of the microorganisms. Interdependence of the values of theseparameters and treatment efficiency according to TPH is being established, Obtained resultssupport the theory of biosorption process and the process workability for the treatment ofwastewater, polluted with light oil products, In this article there are given principletechnological solutions and parameters of the biosorbers in SC "Klaipedos nafta",

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