AOP treatment and reuse of laundry machine wastewater (original) (raw)
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Sainstek : Jurnal Sains dan Teknologi, 2016
The utility of synthetic cleaners or commonly called as detergents have developed far indeed in this century. The effective and efficient use of detergents in cleaning process, was attracted to be used in laundry's industry commercially, though, it has some drawback to the society and environments. Since the active materials in the compounds can cause irritating to the skins, cataracts to mature eyes and some other environmental issues due to the excess of foams can prevent oxygen dilution in the water so it be hazardous to water living organisms. Once the promising method to solve this problem is by photo-degradation using photo-catalyst. Photocatalyst is the process using light and catalyst in order to accelerate chemical transformation, thus, solar or uv-rays can be used as light sources. This research aims at to show the ability of catalyst TiO2 to degrade active material in linear alkyl benzene sulphonate (LAS) and alkyl benzene sulphonate (ABS) which is available in commercial detergent. Photo-degradation of LAS and ABS compounds was determined by optimum capacity TiO2 and irradiance time. Whereas, for environmental application, the degrade compounds such Rinso® and Wipol® was chosen since it is commonly used in daily life. Beside, artificial water waste and laundry water was chosen to show the environmental effect. The result shows that the optimum number of catalyst TiO2 addition for LAS degradation was 1.5 g, and optimum time was 120 minute. Whereas the optimum number of catalyst TiO2 addition for ABS degradation was 2.0 g, and optimum time was 120 minute as well. Thus, for detergent Rinso®, at optimum catalyst addition, we found degradation number was 75.83%, and for detergent Wipol®, at optimum catalyst addition, we found degradation number was 57.94%. Whereas, for artificial waste at optimum catalyst addition, we found degradation number was 91.32%, and for laundry water waste at optimum catalyst addition, we found degradation number was 70.27%.
Archives of Environmental Protection, 2017
Surfactants after their use are discharged into aquatic ecosystems. These compounds may be harmful to fauna and flora in surface waters or can be toxic for microorganisms of the activated sludge or biofilm in WWTP. In order to determine effectiveness of different advanced oxidation processes on the degradation of surfactants, in this study the degradation of anionic surfactants in aqueous solution using photolysis by 254 nm irradiation and by advanced oxidation process in a H
Treatment of laundry wastewater by UVC-based advanced oxidation process – A case study
2020
Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711 103, West Bengal, India E-mail: deepjyotidas831@gmail.com Manuscript received online 06 January 2020, accepted 21 June 2020 The main aim of this research is to evaluate the treatment of laundry wastewater by the UV-H<sub>2</sub>O<sub>2</sub> advanced oxidation process. The COD and BOD of the wastewater were about 800 mg/L and 120 mg/L respectively, which indicate that the wastewater is poorly biodegradable. In batch operation with simultaneous exposure to 8 UV lamps, H<sub>2</sub>O<sub>2</sub> doses were 10, 20, 30 and 40 mg/L. The percentage removal of COD was 42%, 53%, 77% and 75% respectively. The biodegradability index increased with increase in peroxide dose. The degradation followed first order kinetics and the kinetic constants were 0.0045, 0.0059, 0.0117 and 0.0119 min<sup>–1</sup> for peroxide dose of 10, ...
Solar Energy, 2004
A commercial detergent whose major components are an anionic surfactant and a fluorescent whitening agent can be photodegraded in aqueous TiO 2 dispersions under irradiation with concentrated sunlight in the presence of air. The degradation process followed apparent first-order kinetics in terms of the total sunlight energy impinging on the photoreactive system. The effects of (a) TiO 2 loading, (b) circulation flow rate, and (c) pH of the reactant solution on the kinetics of decomposition of the detergent were examined. Under the prevailing conditions, the optimal operational parameters for this detergent were, respectively: TiO 2 loading, 6 g l À1 ; circulation flow rate, 4.9 l min À1 ; and pH, 4.9. The rate of increase of the surface tension was greater than the rate of decrease of the concentration of the detergent. This study adds to our knowledge base in the effective use of sunlight irradiation to detoxify wastewaters containing undesirable detergents.
2017
The presence of compounds such as surfactants, which are difficult to degrade by conventional, chemical and/or biological methods, has imposed the growth of efficient water-treatment processes. Apprehensions over the globally disseminated surfactants are growing because these surfactants are environmentally tenacious and bioaccumulative. A solution for the removal of these recalcitrant surfactants has involved wide-ranging examinations in the field of advanced oxidation processes (AOP). In these chemical oxidation processes, reaction mechanisms include the change in structure, and chemical properties of the organic substances, where molecules break into smaller fragments. Unlike conventional methods, chemical oxidation processes entirely eliminate the surfactants by mineralizing and breaking down the organic compound to form carbon dioxide and water. Keywords— surfactants; wastewater treatment technologies; chemical oxidation; remova efficiencyl
Treatment of textile waste water using H2O2/UV system
Physicochemical Problems of …, 2008
Treatment of textile wastewater with the Advanced Oxidation Process (AOP) is based on using the H2O2/UV system. The optimum condition for treatment of an effluent sample was determined by ex-perimenting on a synthetic dye solution prepared using the blue sulfur dye. ...
2018
Department of Civil Engineering, Center for Healthcare Science and Technology, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711 103, West Bengal, India E-mail : bijolimondal15@gmail.com Manuscript received 15 November 2017, accepted 12 February 2018 This work investigates the degradation of anionic surfactant (sodium dodecyl sulfate, SDS) using direct UV and UV-H<sub>2</sub>O<sub>2</sub> advanced oxidation process (AOP). Direct photolysis and AOP experiments were conducted by using UV reactor that emits monochromatic light at 253.7 nm. The experiments on direct photolysis of SDS is very slow process compared to UV-H<sub>2</sub>O<sub>2</sub> process. The rate constant was determined by using pseudo-first order kinetic model and rate constant was 0.8685 min–1. Experiments were also carried out to observe degradation of SDS (initial concentration of 100 mg/L) in municipal wastewater spiked samples. It was found ...
Proceedings of the Water Environment Federation, 2007
Peroxide and permanganate oxidation, ultrasound induced oxidation, ozonation, UV and UV+H 2 O 2 oxidation processes are tested for removal of surfactants in a pharmaceutical process wastewater. The objective is to achieve total surfactant concentration in the effluent as less than 2 mg/L. Presence of H 2 O 2 did not show any enhancement on ultrasound degradation of surfactants. However, presence of permanganate improved removal of surfactants under ultrasound irradiation. With 1 g/L permanganate, total surfactant was 75% removed, with concentration decreased to 2.1 mg/L after 3 hours of sonication. Ten (10) minutes of ozonation produce about 31% removal of total surfactant. After 20 min of ozonation, 22% of cationic surfactant was removed while 69% of non-ionic surfactant was removed, demonstrating that the cationic surfactant presented in this wastewater is more difficult to destroy than non-ionic surfactant with the ozonation. Surfactant concentration decreased to 3 mg/L (64% removal efficiency) within 1 hour of UV irradiation. Presence of H 2 O 2 or permanganate enhanced UV degradation of surfactants significantly. The total surfactant concentration was decreased to 1.6 and 1.7 mg/L (81% and 80% removal efficiencies) in 30 min of UV irradiation in the presence of 100 mg/L H 2 O 2 and 1 g/L permanganate, respectively. No obvious enhancement on surfactants removal was observed by increasing the H 2 O 2 dosage from 100 mg/L to 1 g/L. UV flow through reactor with 50 mg/L H 2 O 2 was selected as the optimized system for the treatment of the surfactant wastewater. The retention time was 30 minutes. The results showed that the effluent concentration of cationic surfactant was lower than 0.13 mg/L and that of non-ionic was 1.07 mg/L and 86% of total surfactant was destructed. Separately and in parallel to the work discussed above studies were conducted by Parsons Corporation aimed toward removal of surfactants via Foam Fractionation. Using a 1 liter graduated cylinder, air pump, diffuser stone and 800 ml of biologically treated wastewater, tests were conducted at: 0.1; 1.0; 2.0; 4.0; 6.0; 9.0, and 12 liters/min. Optimum results indicated that at an air flow of 6 L/min (3.5 cm/s) >61% reduction of total surfactant was achieved from 2.74 mg/L to 1.05 mg/L. The surfactant removed was predominantly (83-84% of total surfactant) nonionic species and at 3.5 cm/s airflow the side stream (foam over) was only 6% (50ml) of the starting volume. The detailed results of this study are reported elsewhere.
Ciência e Natura, 2015
Several studies have reported the adverse effects of persistent compounds in the wastewater, showing the fragility of the biologic treatment. Harmful effects for both aquatic biota and human being are caused by those compounds. In order to minimize the adverse environmental impacts, Advanced Oxidation Processes (AOPs) are used in the degradation of those pollutants to achieve high removal rates. In the present the comparisons between the efficiency of AOPs using natural and artificial Ultra Violet light (UV) were made based on the literature review, addressing constructive and operational characteristics of the reactors. The findings indicated that the high levels of solar energy, which are registered in different regions of Brazil, show the viability of the AOP using natural radiation to the decontamination of industrial effluents. Thus the inclusion of advanced oxidation in the treatment of wastewater could be considered as a significant contribution to the supported development in Brazil.