Ultrasonic treatment of liquid waste containing EDTA

Chitra, S.; Paramasivan, K.; Sinha, Pradeep K.; Lal, K. B.

doi:10.1016/s0959-6526(03)00034-9

Cited by 68 publications

(35 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this reason, it was considered best to add it in order to speed up the oxidation process of the substance to be degraded (Chitra et al 2004). On occasions, this process is enhanced when UV radiation is also included because more free radicals are formed.…”

Section: Hydrogen Peroxide and Ultrasoundsmentioning

confidence: 99%

“…As a result, its removal from the environment is necessary because it can cause the complexation of radioactive cations and produce the chemical precipitation of compounds. Chitra et al (2004) used this method for EDTA degradation. For the complete oxidation of EDTA into carbon dioxide, ammonia, and water, 17 mol of hydrogen peroxide was necessary.…”

Section: Hydrogen Peroxide and Ultrasoundsmentioning

confidence: 99%

See 1 more Smart Citation

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Poyatos

Muñío

Almécija

et al. 2009

Water Air Soil Pollut

425

174

View full text Add to dashboard Cite

The protection and conservation of natural resources is one of the main priorities of modern society. Water is perhaps our most valuable resource, and thus should be recycled. Many of the current recycling techniques for polluted water only concentrate the pollutant without degrading it or eliminating it. In this sense, advanced oxidation processes are possibly one of the most effective methods for the treatment of wastewater containing organic products (effluents from chemical and agrochemical industries, the textile industry, paints, dyes, etc.). More conventional techniques cannot be used to treat such compounds because of their high chemical stability and/or low biodegradability. This article describes, classifies, and analyzes different types of advanced oxidation processes and their application to the treatment of polluted wastewater.

show abstract

Section: Hydrogen Peroxide and Ultrasoundsmentioning

confidence: 99%

Section: Hydrogen Peroxide and Ultrasoundsmentioning

confidence: 99%

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Poyatos

Muñío

Almécija

et al. 2009

Water Air Soil Pollut

425

174

View full text Add to dashboard Cite

show abstract

“…1 described in the degradation procedure and the amount of Fe 2? was added as mentioned in laboratory studies [20]. Samples were collected at regular time intervals through the outlet.…”

Section: Methodsmentioning

confidence: 99%

“…The results from the laboratory studies on the kinetics of photodegradation of EDTA (2%) using Fenton's reagent, the details of which mentioned elsewhere [20], revealed that the reaction using sunlight/Fenton's reagent was faster than that obtained in any of the other processes viz., UV (15 W) ? Fenton's reagent, UV ?…”

Section: Introductionmentioning

confidence: 96%

Photodegradation of EDTA using Fenton’s reagent: a pilot-scale study

2011

Self Cite

View full text Add to dashboard Cite

The presence of ethylenediaminetetraacetic acid (EDTA) in decontamination wastes can cause complexation of cations resulting in interferences in their removal by various treatment processes, for example chemical precipitation, ion exchange, etc., and can negatively affect the quality of the final form of the waste. Advanced oxidation processes using ozone, H 2 O 2 , ultrasonics (US), ultraviolet (UV) light, Fenton's reagent (Fe(II) ? H 2 O 2 ), alone or in combination, are regarded as possible methods of clean and ecologically safe remedial treatment for the degradation of organics. In this study, the development of a column photoreactor (15 L) and a shallow-tank photoreactor (100 L) was carried out at the Centralised Waste Management Facility, Kalpakkam, India. Pilot-scale (batch) studies of the photocatalytic degradation of EDTA (20,000 mg/L) using UV ? Fenton's reagent in these reactor geometries were attempted. The effect of the power of the UV radiation on the kinetics of photodegradation of EDTA (20,000 mg/L) was studied using the column photoreactor. The shallow-tank reactor was used to study the photodegradation of EDTA (20,000 mg/L) using UV radiation, visible radiation, and sunlight. The successful use of sunlight as a source of energy and its greater effectiveness than UV radiation in the treatment of EDTA are presented.

show abstract

“…High pressure and temperature, which are a consequence of the cavitation effect [25], promote cracking of the high-molecular weight hydrocarbons of the vacuum residuum to form radicals [13,26]. According to the chain reaction mechanism proposed by Rice in [26], free radicals participate in chain propagation and chain termination reactions.…”

mentioning

confidence: 99%

Upgrading vacuum residuum by combined sonication and treatment with a hydrogen donor

Yang

Zhang

et al. 2013

Chem Technol Fuels Oils

View full text Add to dashboard Cite

Vacuum residuum was upgraded in an ultrasonic reactor of our own design. We found that during sonication in the absence of a hydrogen donor, the viscosity of the vacuum residuum is reduced by 10.98%; without sonication but in the presence of tetralin, it is reduced by 30.9%; and with combined tetralin treatment and sonication, the viscosity is reduced by 39.27%. The synergistic effect of ultrasound and tetralin results in a product with more stable viscosity, higher percentage of light components, lower density and lower pour point than obtained by separate application of these technologies.The amount of vacuum residuum that can be produced in oil refineries is steadily increasing, and may reach 50% of the crude oil [1][2][3][4]. Vacuum residuum is characterized by high density, viscosity, molecular weight, and ash content plus low H:C ratio [5-7], which is an obstacle to refining it on catalytic cracking apparatus for residual crude. Thus there is a need to develop a cost-effective technology for refining vacuum residuum that does not have the limitations of catalytic cracking.Many publications devoted to study of ultrasonic cavitation energy (including [8][9][10][11]) suggest that cavitation technology may be effectively applied to viscosity reduction in vacuum residuum. An ultrasonic generator converts electrical energy to mechanical vibrations, which are propagated within the vacuum residuum as ultrasonic waves [9,12]. The pressure fluctuation leads to generation of microscopic cavities within the vacuum residuum, which expand and violently implode, creating shock waves and thermal energy. The thermal energy and the vigorous

show abstract

Ultrasonic treatment of liquid waste containing EDTA

Cited by 68 publications

References 15 publications

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Photodegradation of EDTA using Fenton’s reagent: a pilot-scale study

Upgrading vacuum residuum by combined sonication and treatment with a hydrogen donor

Contact Info

Product

Resources

About