Advanced treatment of benzothiazole contaminated waters: comparison of O3, AC, and O3/AC processes

2005 ◽  
Vol 52 (10-11) ◽  
pp. 281-288 ◽  
Author(s):  
H. Valdés ◽  
C.A. Zaror
Keyword(s):  
Activated Carbon ◽  
Flow Reactor ◽  
Removal Rate ◽  
Carbon Surface ◽  
Advanced Treatment ◽  
Radical Scavenger ◽  
Activated Carbon Adsorption ◽  
Simultaneous Treatment ◽  
Ozone Oxidation ◽  
Carbon Adsorption

Benzothiazole (BT) is a toxic and poorly biodegradable contaminant, usually found in wastewater from rubber related applications. This compound could be effectively eliminated using advanced treatment processes. This paper compares experimental results on detoxification systems based on ozone oxidation, activated carbon adsorption, and simultaneous adsorption-oxidation using ozone in the presence of activated carbon. The effect of pH (2–11), and the presence of radical scavengers (tert-butyl alcohol and sodium carbonate) on process rates and removal efficiencies are assessed at laboratory scale. The experimental system consisted of a 1L differential circular flow reactor and an ozone generator rated at 5g O3/h. Results show that ozone oxidation combined with activated carbon adsorption increases the overall BT oxidation rate with respect to the ozonation process and activated carbon adsorption. In the presence of free radical scavenger, only a 44% reduction in BT removal rate is observed in the simultaneous treatment, as compared with 72% when ozonation treatment is used, suggesting that BT oxidation reactions mainly take place on the activated carbon surface.

Methylene blue removal from contaminated waters using O3, natural zeolite, and O3/zeolite

2009 ◽  
Vol 60 (6) ◽  
pp. 1419-1424 ◽  
Author(s):  
H. Valdés ◽  
R. F. Tardón ◽  
C. A. Zaror
Keyword(s):  
Methylene Blue ◽  
Natural Zeolite ◽  
Flow Reactor ◽  
Removal Rate ◽  
Experimental System ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Oxidation Reactions ◽  
Simultaneous Treatment ◽  
Ozone Oxidation

This paper compares experimental results on methylene blue (MB) removal systems based on ozone oxidation, zeolite adsorption, and simultaneous adsorption-oxidation using ozone in the presence of natural zeolite. The effect of pH (2–8), and the presence of radical scavengers (sodium acetate) on process rates and removal efficiencies are assessed at laboratory scale. The experimental system consisted of a 1 L differential circular flow reactor and an ozone generator rated at 5 g O3/h. Results show that ozone oxidation combined with zeolite adsorption increases the overall MB oxidation rate with respect to ozonation process and zeolite adsorption. In presence of free radical scavenger, only a 25% of reduction on MB removal rate are observed in the simultaneous treatment, as compared with 70% when ozonation treatment is used, suggesting that MB oxidation reactions take mainly place on the zeolite surface.

Microwave-Ferrous Sulfate Modified Activated Carbon Adsorption Study on Phosphorus Removal

2014 ◽  
Vol 919-921 ◽  
pp. 2149-2152
Author(s):  
Ya Feng Li ◽  
Chun Fei Wei
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Phosphorus Removal ◽  
Ferrous Sulfate ◽  
Removal Rate ◽  
High Concentration ◽  
Activated Carbon Adsorption ◽  
Modified Activated Carbon ◽  
Carbon Adsorption ◽  
Treated Effluent

Using microwave-ferrous sulfate modified activated carbon adsorption manner to remove the high concentration of phosphorus in wastewater. The power of microwavethe concentration of ferrous sulfate and reaction time on phosphorus removal were studied. When the power of microwave was 425W,the concentration of ferrous sulfate was 0.1mol/L,reaction time was 50 min,the removal rate of TP reaches 95.67%,the treated effluent TP can be dropped to 0.48mg/L,the TP can reaches the first effluent standard of TP in the comprehensive wastewater discharge standard (GB8978-1996).Microwave-ferrous sulfate modified activated carbon is adapted to treat high concentration phosphorus in the wastewater.

Influence de la température sur le rendement des filtres au charbon activé biologique

1989 ◽  
Vol 16 (6) ◽  
pp. 820-828 ◽  
Author(s):  
Sylvie Letendre ◽  
Raymond Desjardins ◽  
Line Fortin ◽  
Pierre Lafranche ◽  
François G. Brière
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Treatment Plant ◽  
Warm Season ◽  
Water Treatment Plant ◽  
Activated Carbon Adsorption ◽  
Temperature Variations ◽  
Biological Activated Carbon ◽  
Carbon Adsorption ◽  
Start Up

To evaluate the performance of the biological activated carbon filters at the Sainte-Rose water treatment plant in Ville de Laval (Québec), water and carbon samples were taken over a period of 150 days. Sampling began 1 year after filter start-up. The filters were then in a pseudo-equilibrium state. During winter, the removal rate of organic material is reduced because of lower water temperatures which affect bacterial activity. Bacterial density in the upper layers of the filter is influenced by temperature variations. During the warm season, bacteria counts are higher in the upper layer of the carbon, in the filter effluent, and in the backwash water. For equal carbon masses, bituminous carbon and peat-based extruded carbon have similar removal rates. However, for equal volumes, bituminous carbon is more efficient. Key words: biological activated carbon, adsorption, filtration, drinking water, organic matter.

scholarly journals Comparison of Coal-, Coconut-, and Wood-Based Activated Carbons for Removal of Organic Matters in Wastewater Treatment Plant Effluent

2021 ◽  
Vol 43 (4) ◽  
pp. 257-264
Author(s):  
Eunkwang Kwon ◽  
Soohyung Park ◽  
Wontae Lee
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Organic Materials ◽  
Activated Carbons ◽  
Removal Rate ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Activated Carbon Adsorption ◽  
Publicly Owned Treatment Works ◽  
Carbon Adsorption

Objectives : This study investigated the removal of dissolved organic materials by coal-, coconut-, and wood-based activated carbons to assess the addition of an activated carbon process to a publicly owned treatment works (POTW).Methods : We assessed the removal of total organic carbon (TOC) by each process in the POTW, and examined the removal of TOC and UVA254 upon adding different amounts of coal-, coconut- and wood-based activated carbons (50, 100, 200, 300, and 400 mg/L) with various contact time (10, 20, 30, 60, 120 min).Results and Discussion : Approximately 80% of TOC was removed throughout the POTW compared to the influent. The activated carbon adsorption tests of coagulated wastewater revealed that the removal rate of TOC and UVA254 from coal-based activated carbon was higher than those of coconut-based and wood-based activated carbons. The removal rate of dissolved organic materials was highest in ozone treated wastewater in all types of activated carbons, followed by ultraviolet disinfected wastewater and coagulated wastewater.Conclusions : It was possible to remove an additional 35-55% of dissolved organic materials upon addition of activated carbon to the treated wastewater although the removal depends on the material of the activated carbon, the injection amount, and the contact time. If an activated carbon process is adopted to the POTW, it can meet the effluent water quality standards (TOC).

Treatment of High-Strength, Complex and Toxic Chemical Wastewater: End-of Pipe “Best Available Technology” vs. an In-Plant Control Program

1994 ◽  
Vol 29 (8) ◽  
pp. 221-233
Author(s):  
Shimshon Belkin ◽  
Asher Brenner ◽  
Alon Lebel ◽  
Aharon Abeliovich
Keyword(s):  
Activated Carbon ◽  
Control Program ◽  
High Strength ◽  
Activated Carbon Adsorption ◽  
Acceptable Solution ◽  
Conventional Activated Sludge ◽  
Carbon Adsorption ◽  
Individual Source ◽  
Best Available Technology ◽  
Available Technology

A case study is presented, in which two approaches to the treatment of complex chemical wastewater are experimentally compared: an end-of-pipe “best available technology” option and an in-plant source segregation program. Both options proved to be feasible. Application of the powdered activated carbon treatment (PACT™) process for the combined end-of-pipe stream yielded up to 93% reduction of dissolved organic carbon, with complete toxicity elimination. In order to examine the potential for applying a conventional activated sludge process, a simplified laboratory screening procedure was devised, aimed at establishing baseline data of removability potential, defined either by biodegradation, activated carbon adsorption or volatilization. Using this procedure, the major source of the non-biodegradable fraction in the combined park's wastewater was traced to a single factory, from which twelve individual source streams were screened. The results allowed the division of the tested sources into three groups: degradable, volatile, and problematic. A modified wastewater segregation and treatment program was accordingly proposed, which should allow an efficient and environmentally acceptable solution. This program is presently at its final testing stages, at the conclusion of which a full comparison between the two approaches will be carried out.

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