Removal of 2,4,6-Trichlorophenol by Iron and Manganese Oxides / Granular Activated Carbon with H2O2

2010 ◽  
Vol 154-155 ◽  
pp. 28-33 ◽  
Author(s):  
Zhen Zhong Liu ◽  
Hui Ping Deng ◽  
Zhan Li Chen
Keyword(s):  
Activated Carbon ◽  
Manganese Oxides ◽  
Removal Rate ◽  
Granular Activated Carbon ◽  
Carbon Composite ◽  
X Ray Diffraction ◽  
Freundlich Isotherms ◽  
Initial Ph ◽  
Coprecipitation Route ◽  
Iron And Manganese

Iron and manganese oxides/granular activated carbon composite (GACFM) was prepared via a chemical coprecipitation route, followed by a heat treatment at elevated temperature. The as–prepared GACFM was characterized by X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The main iron and manganese oxides actually present in the composites were mainly composed of Fe3O4 ,Mn3O4 and (FeO)x(MnO)1-x. The adsorption and catalytic properties of GACFM and some conditions effects such as H2O2, pH , temperature and CO32- were studied for the removal of 2,4,6-trichlorophenol (TCP) from aqueous medium. The adsorption of TCP on GACFM obeyed the Freundlich isotherms. When the initial concentration of H2O2 was 0.4mg/L , 5mg/L TCP removal rate was maximum on the GACFM. The treatment of TCP could be carried out at initial pH under 7.0. CO32- can scavenge •OH in solution and decreased TCP removal. In the whole, GACFM was satisfactory absorbent and catalyst for the removal of chlorophenol from water.

scholarly journals Ti/RuO2-IrO2-SnO2 Anode for Electrochemical Degradation of Pollutants in Pharmaceutical Wastewater: Optimization and Degradation Performances

2020 ◽  
Vol 13 (1) ◽  
pp. 126
Author(s):  
Guozhen Zhang ◽  
Xingxing Huang ◽  
Jinye Ma ◽  
Fuping Wu ◽  
Tianhong Zhou
Keyword(s):  
Removal Rate ◽  
Inorganic Compounds ◽  
Oxide Coating ◽  
X Ray Diffraction ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Dimensionally Stable Anodes ◽  
X Ray ◽  
Initial Ph ◽  
Cod Removal Rate

Electrochemical oxidation technology is an effective technique to treat high-concentration wastewater, which can directly oxidize refractory pollutants into simple inorganic compounds such as H2O and CO2. In this work, two-dimensionally stable anodes, Ti/RuO2-IrO2-SnO2, have been developed in order to degrade organic pollutants from pharmaceutical wastewater. Characterization by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) showed that the oxide coating was successfully fabricated on the Ti plate surface. Electrocatalytic oxidation conditions of high concentration pharmaceutical wastewater was discussed and optimized, and the best results showed that the COD removal rate was 95.92% with the energy consumption was 58.09 kW·h/kgCOD under the electrode distance of 3 cm, current density of 8 mA/cm2, initial pH of 2, and air flow of 18 L/min.

scholarly journals Viability of a Single-Stage Unsaturated-Saturated Granular Activated Carbon Biofilter for Greywater Treatment

2020 ◽  
Vol 12 (21) ◽  
pp. 8847
Author(s):  
Ahmed Sharaf ◽  
Bing Guo ◽  
David C. Shoults ◽  
Nicholas J. Ashbolt ◽  
Yang Liu
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Feeding Strategy ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Complete Removal ◽  
Single Stage ◽  
Chemical Oxygen Demand Removal ◽  
Over Time ◽  
Sewage Source

Compared with conventionally collected sewage, source-diverted greywater has a higher potential for on-site treatment and reuse due to its lower contaminant levels and large volume. A new design of granular activated carbon (GAC) biofilters was developed by incorporating unsaturated and saturated zones in a single stage to introduce an efficient, passive, and easy-to-operate technology for greywater on-site treatment at the household scale. The design was customized for its intended application considering various aspects including the reactor’s configuration, packing media, and feeding strategy. With the highest hydraulic and organic loadings of 1.2 m3 m−2 d−1 and 3.5 kg COD m−2 d−1, respectively, and the shortest retention time of 2.4 h, the system maintained an average total chemical oxygen demand removal rate of 94% with almost complete removal of nutrients throughout its 253 days of operation. The system showed a range of reduction efficacy towards five surrogates representing viruses, bacteria, and Cryptosporidium and Giardia (oo)cysts. A well-functioning biofilm was successfully developed, and its mass and activity increased over time with the highest values observed at the top layers. The key microbes within the biofilter were revealed. Feasibility of the proposed technology was investigated, and implications for design and operation were discussed.

scholarly journals Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

2017 ◽  
Vol 9 (10) ◽  
pp. 1684 ◽  
Author(s):  
George Gallios ◽  
Athanasia Tolkou ◽  
Ioannis Katsoyiannis ◽  
Katarina Stefusova ◽  
Miroslava Vaclavikova ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Manganese Oxides ◽  
Iron And Manganese

Synthesis and characterization of nano magnesium oxide impregnated granular activated carbon composite for H2S removal applications

2017 ◽  
Vol 136 ◽  
pp. 127-136 ◽  
Author(s):  
Induni W. Siriwardane ◽  
Ranodhi Udangawa ◽  
Rohini M. de Silva ◽  
A.R. Kumarasinghe ◽  
Robert G. Acres ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Magnesium Oxide ◽  
Granular Activated Carbon ◽  
Carbon Composite ◽  
Synthesis And Characterization ◽  
H2s Removal

Incidence of the Presence of Lead on the Elimination of Humic Substances

2016 ◽  
Vol 723 ◽  
pp. 645-649
Author(s):  
Saâdia Guergazi ◽  
Mohamed Mahdi Missaoui
Keyword(s):  
Activated Carbon ◽  
Humic Substances ◽  
Reaction Rate ◽  
Activated Carbons ◽  
Removal Rate ◽  
Granular Activated Carbon ◽  
Maximum Efficiency ◽  
Carbon Powder ◽  
Powder Activated Carbon ◽  
Agitation Time

The main objective of our work is to test the performance of powder activated carbon (PAC) and granular activated carbon (GAC) in the retention of humic substances in the presence of lead. The adsorption tests conducted in synthetic solutions of distilled water. The results showed that, the removal efficiency of humic substances varies with the agitation time was obtained maximum efficiency after 180 minutes for PAC and 300 for the GAC. However, on granular activated carbon (GAC) recorded an improvement in the removal of humic substances in the order of 1.60%. The reaction rate is the same for the activated carbon powder (PAC). By against, for the GAC the removal rate of humic substances in the presence of lead is slower. A comparison between our results with the absorption of humic substances without the presence of lead showed that the elimination of humic substances (10 mg/l) in the presence of lead (5mg/l) on powder activated carbon (1 g/L) is disturbed. The removal efficiencies decrease with the increase on the pH of medium in an interval ranging from 2 to 12.The variation of the mass of lead has recorded an inhibiting role in the adsorption of humic substances for both activated carbons.

Degradation of Orange IV Catalyzed by Fe/S/GAC in the Presence of H2O2

2012 ◽  
Vol 466-467 ◽  
pp. 458-462
Author(s):  
Ying Jie Zhang ◽  
Shu Fen Xu ◽  
Xia Liao ◽  
Rong Yang ◽  
Da Peng Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Removal Rate ◽  
X Ray Diffraction ◽  
Heterogeneous Fenton ◽  
X Ray ◽  
Catalytic Reactivity ◽  
Scanning Electron

A new heterogeneous Fenton-like catalyst of Fe/S/GAC was prepared by granular activated carbon (GAC) soaked in solution of (NH4)2S2O8 and Fe(NO3)3. The effect of the concentration of (NH4)2S2O8 , Fe(NO3)3, drying temperature and different catalysts on the catalytic reactivity of catalyst was discussed. The removal rate of Orange IV was used to express the catalytic reactivity of the catalyst. The prepared catalysts were characterized by X-ray diffraction (XRD), specific surface area (BET) and scanning electron microscopy (SEM). The removal rate of Orange IV followed second-order kinetics. The catalyst of Fe/S/GAC has higher catalytic activity than that of Fe/GAC.

Manganese Removal from Electrolytic Manganese Residue Using Ozone

2014 ◽  
Vol 997 ◽  
pp. 754-757
Author(s):  
Wen Qiang Yang ◽  
Juan An ◽  
Xiao Li Yuan ◽  
Wen Tang Xia
Keyword(s):  
Reaction Temperature ◽  
Contact Time ◽  
Manganese Oxides ◽  
Removal Rate ◽  
Experimental Investigations ◽  
Limit Values ◽  
Valence States ◽  
Electrolytic Manganese ◽  
Electrolytic Manganese Residue ◽  
Initial Ph

This paper deals with experimental investigations related to removal of manganese (II) from electrolytic manganese residues by using ozone as oxidant. Ozone was used in this study to oxidize manganese converting bivalent manganese to high valence states, the oxidized salts will precipitate as manganese oxides, that to reach the concentration of the pollutant under its limit values in water. Effects of reaction temperature, reaction contact time and initial pH value on the manganese (II) removal were investigated. The results indicated that the removal rate exceeded 99.9 percent, and the manganese (II) in solution was lower than 0.1 mg·L-1 under the conditions of reaction temperature 45 °C, reaction contact time 40 min and initial pH 12.

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