Combined homogeneous and heterogeneous advanced oxidation process for the treatment of tannery wastewaters

This study investigated biogas production as an alternative treatment of tannery wastewater (TWW) and its use as a pre-treatment medium to increase CH yield from anaerobic digestion (AD) of wheat straw. The TWW had high levels of sulfate and chloride, so biochemical CH potential could be estimated only when the TWW was diluted. Untreated straw yielded 255 NL CH (kg VS), whereas straw that had been pre-treated with TWW yielded 314 NL CH (kg VS) (35% increase). Treatment of TWW by AD with a co-substrate might be possible using a controlled feedstock mixing ratio. Use of TWW as a pre-treatment medium by simple co-storage before AD would be beneficial as an inexpensive treatment of lignocellulosic biomass.

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“…Combining solar/TiO 2 /Fe 2+ /H 2 O 2 treatments removed 96% of chemical oxygen demand (COD) (Selvabharathi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Use of tannery wastewater as an alternative substrate and a pre-treatment medium for biogas production

Vazifehkhoran

Shin

Triolo

2018

Bioresource Technology

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“…It is also beneficial in terms of cost and safety while having high efficiency, but it needs better reactor design and there is scope for a better understanding of the process and its control (3). The use of hydroxyl ions from Fenton's Reagent (Fe 2+ + H2O2,) comes under advanced oxidation processes (AOPs) and this can be carried out as a primary or tertiary treatment (28). It is prudent to remove as much chromium from the wastewater as possible because it is inhibitory to the growth of the microbes used in biological treatment (21).…”

Section: Primary Treatmentmentioning

confidence: 99%

“…Adding the Fenton reagent to this improves the efficiencies of both the systems by increasing lifetime and generating more reactant radicals. Combination of biological treatments and AOPs have been suggested as pre-treatment or post-treatment for increasing the efficiency of the treatments as well as reducing the costs (28). Integration of membrane processes with photoelectrooxidation has been suggested to enhance the reduction of COD levels in tannery effluent (53).…”

Section: Tertiary Treatmentmentioning

confidence: 99%

Available Techniques of Wastewater Management Practices in Indian Tanneries: A Literature Review

Bhaduri

2021

J. Environ. Treat. Tech.

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Tanning is the process of turning animal hide into leather. The manufacturing process leads to the generation of wastewater, which must be treated before discharge. The treatment processes of this wastewater in India was examined. A systematic review based on Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines was carried out on the electronic database Google Scholar from 2010 to 2020. Wastewater treatment practices in Indian tanneries were looked for and 64 relevant reports and articles were shortlisted and studied. The results showed that coagulation with alum and ferric chloride gave the best results in primary treatment, aerobic and anaerobic processes gave the best results when combined, and tertiary treated water could be reused.

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“…The process of tanning involves the use of large amounts of fresh water and various chemicals such as lime, sodium bicarbonate, common salt, sodium sulphate, chrome sulphate, fat liquors, vegetable oils and dyes [2]. Although Chromium(III) salts are the most widely used chemicals for tanning processes, only 70% of the total chromium salts react with the hides.…”

Section: Introductionmentioning

confidence: 99%

“…The reactions occurring at the iron electrodes are presented in Eqs. (2) and 3, where the sacrificial iron anode releases Fe 2+ ions into the solution [Eq. 2…”

Section: Introductionmentioning

confidence: 99%

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selvabharathi¹,

Adishkumar²,

Banu³

2019

DWT

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Chromium(III) used in tanning process is not consumed fully and around 30-40% of Chromium(III) is washed away to the environment causing severe environmental problem especially to the aquatic system. To remove Chromium(III) from wastewater, many different treatment techniques have been developed. This study deals with the ability of electrochemical peroxidation process for the removal of Chromium(III) from tannery wastewater in a batch stirred tank bench scale reactor with hopper bottom of 5 L working volume equipped with two iron electrodes which were investigated. The removal percentage of chromium was determined by varying operating parameters such as pH = 2-8, Fe 2+ = 2-5 mg/L, H 2 O 2 = 5-20 mg/L and current density = 10-40 mA/cm 2 were studied. The results showed that the Chromium(III) removal efficiency of 87% was achieved under optimum condition such as pH = 2, Fe 2+ = 2 mg/L H 2 O 2 = 15 mg/L, current density = 30 mA/cm 2 and contact time was 120 min with an electrical energy consumption of 0.073 kWh/L. The operating costs for the removal of Chromium(III) was found to be 0.4 $/m 3 for treated tannery wastewater. The electrochemical peroxidation process proved to be an efficient and appropriate technique for the removal of Chromium(III) from tannery wastewater.

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Combined homogeneous and heterogeneous advanced oxidation process for the treatment of tannery wastewaters

Cited by 22 publications

References 30 publications

Use of tannery wastewater as an alternative substrate and a pre-treatment medium for biogas production

Use of tannery wastewater as an alternative substrate and a pre-treatment medium for biogas production

Available Techniques of Wastewater Management Practices in Indian Tanneries: A Literature Review

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

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