Decolourization and COD reduction of textile wastewater by ozonation in combination with biological treatment

Abidin, Che Zulzikrami Azner; Fahmi, Muhammad Ridwan; Ong, Soon‐An; Makhtar, Siti Nurfatin Nadhirah Mohd; Rahmat, Nazzery Rosmady; Ahmad, Rosmaini

doi:10.15282/ijame.13.1.2016.1.0261

Cited by 14 publications

(11 citation statements)

References 19 publications

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“…3, 4 and 5) were calculated from the absorbance and RES values (not shown) at all three wavelengths (436 nm, 525 nm, 620 nm) depending on the ozonation time. The Reactive Black 5 molecule (1) was oxidized by ozonation to a small organic molecular structure, based on high color removal efficiency and partial COD removal efficiency. In this study, organic matter was not defined depending on wavelengths.…”

Section: Resultsmentioning

confidence: 99%

“…At alkaline pH, ozone disintegrates rapidly to form hydroxyl radicals and other radical species. In dyes, ozone usually attacks the conjugated double bonds that are a part of chromophores [1,13,16,31]. In general, ozone oxidation involves direct ozone oxidation or free radical reaction.…”

Section: Introductionmentioning

confidence: 99%

“…(1).Color removal efficiency [E = RES o − RES e /RES o ] was calculated from the influent (RES o ) and effluent RESe values. A: Absorbance of water sample at λ wavelength, d: Bathtub thickness (25.4 mm), f: Factor for obtaining Spectral Absorption in m −1 , f = 1000, RES (λ): Spectral absorption coefficient (m −1 ).…”

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confidence: 99%

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Increasing BOD5/COD ratio of non-biodegradable compound (reactive black 5) with ozone and catalase enzyme combination

Dinçer

2020

SN Appl. Sci.

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The effect of ozone and ozone plus a biological catalyst (catalase) on the degradation processes of Reactive Black 5 was investigated. The ozonation process was carried out in a laboratory-scale batch reactor with a volume of 500 ml. Chemical oxygen demand (COD), pH, color removal and the BOD 5 /COD ratio were measured during the process. At the first stage, only ozonation was performed, at the second stage, ozonation plus NaCl and Na 2 CO 3 , and at the third stage, ozonation plus catalase enzyme were used. As a result of the oxidation of Reactive Black 5 with only ozone and ozone plus textile auxiliaries, chemical oxygen demand (COD) removal was 34% and 19%, respectively. COD removal efficiency was 43% when 10 ml of catalase was added to the ozone reactor. Carbonate and salt have a negative effect on the oxidation of reactive Black 5 with ozone. Reactive Black 5 was degraded into sub-components, and the biodegradability of the wastewater increased. The pH value decreased from 3.3 down to 1.6, which showed that organic acids were formed as a result of degradation. The use of enzymes in combination with ozonation shows that Reactive Black5 can rapidly convert into the intermediate within the 270-min ozonation time (BOD 5 /COD = 0.46). COD removal was not as high as color removal efficiency. This may have resulted from the formation of colorless oxidation products. The significant increase in biodegradability after ozonation in the presence of the catalyst may also be seen as a reduction of toxic intermediates.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increasing BOD5/COD ratio of non-biodegradable compound (reactive black 5) with ozone and catalase enzyme combination

Dinçer

2020

SN Appl. Sci.

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“…Most industries use this method to reduce COD [45], because the COD test evaluates the environmental load of the process effluents. For these reasons, it causes many problems for ecosystems.…”

Section: Cod Evaluationmentioning

confidence: 99%

Ozone utilisation for discharge printing of reactive dyed cotton

Yiğit

Eren

2017

Coloration Technology

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Environmental pollution is one of the major concerns of the textile finishing sector. The reduction or substitution of the harsh chemicals used during dyeing and printing processes is necessary. In this study, the use of ozone for the discharge printing process was examined in order to substitute the use of reductive agent and caustic soda by ozone gas. The reactive dyed cotton samples were wetted by water and some selected solutions at 25%, 40% and 60% pick up were used and subjected to ozone gas treatment. The gas flow rates were 5 and 10 l/min for 5 and 10 min treatment times, respectively. The results were compared with that of conventional discharge printed samples. Colour discharge (%), colour difference (DE), strength, washing and rubbing fastness and chemical oxygen demand (COD) values were compared and reported. Colour discharge increased at higher gas flow rates and prolonged treatment times. Although ozone printing could not attain the contour sharpness of conventional discharge printing, the addition of selected chemicals affected colour discharge and the contour sharpness. Strength tests did not show a significant decrease when using ozone treatment. Fastness tests results (washing and rubbing) were slightly higher compared with conventional discharge printed samples. COD values were much lower for ozone treatment compared with conventional discharge printing effluent. Consequently, it was demonstrated that ozone may be an environmentally friendly substitute for discharge printing. Coloration Technology Society of Dyers and ColouristsThis article was published online on 16 October 2017. Grammatical and formatting errors were subsequently identified. This notice is included in the online and print versions to indicate that both have been corrected [25 Jan 2018]. The scientific content of the article is unaffected.

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“…Only one percent of drinking water sources is available and the rest of them are frozen in polar glaciers (2%) [1]. Some industrial processes such as the ozonation of wastewater [2] , wastewater purification by graphene oxide [3], wastewater purification by biological oscillatory flow reactor [4], wastewater filtration by nano tube bundles filters [5,6], etc. are the main candidates for freshwater production from wastewater sources.…”

Section: Introductionmentioning

confidence: 99%

Energy analysis of a stepped cascade solar still connected to photovoltaic thermal collector

Hedayati-Mehdiabadi¹,

Baluchestan²,

Sarhaddi³

et al. 2017

Int. J. Automot. Mech. Eng.

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In this paper, the performance evaluation of a stepped cascade solar still connected to photovoltaic thermal (PV/T) collector was carried out. The governing equations of problem was a set of initial value ordinary differential equations which were obtained by writing energy balance for the various components of solar still system (i.e. glass cover, brackish water, absorber plate, and PV/T collector). The numerical model of problem was solved by the 4th-order Runge-Kutta method under real climatic conditions sample. The validation of numerical model was carried out by the experimental data of previous literature. Parametric studies showed that the energy efficiency of stepped cascade solar still maximised in the desired brackish water flow of 0.03 kg/min and the PV/T collector area of 1.3 m 2 . The daily energy efficiency and accumulated freshwater were about 26% and 5.71 kg/(m 2 .day), respectively. An increase of about 20% was obtained in freshwater productivity by the connection of PV/T collector to the stepped cascade solar still. Also, PV/T collector, in addition to providing pumping power, can supply electrical power of about 0.918 kW/day for other uses. In order to produce freshwater during the night time, the usage of the phase change materials below the absorber plate was suggested.

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Decolourization and COD reduction of textile wastewater by ozonation in combination with biological treatment

Cited by 14 publications

References 19 publications

Increasing BOD5/COD ratio of non-biodegradable compound (reactive black 5) with ozone and catalase enzyme combination

Increasing BOD5/COD ratio of non-biodegradable compound (reactive black 5) with ozone and catalase enzyme combination

Ozone utilisation for discharge printing of reactive dyed cotton

Energy analysis of a stepped cascade solar still connected to photovoltaic thermal collector

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