Effect of Chemical Coagulation Pretreatment on Anaerobic Digestion of Tannery Wastewater

Achouri, Ouafa; Pánico, Antonio; Bencheikh-Lehocine, M.; Derbal, Kerroum; Pirozzi, Francesco

doi:10.1061/(asce)ee.1943-7870.0001235

Cited by 23 publications

(13 citation statements)

References 18 publications

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“…Hexavalent Cr is highly toxic, carcinogenic and allergenic, while trivalent Cr is an essential trace element for mammals and less toxic [2,[6][7][8]. Many treatment methods have been developed for removal of hexavalent chromium from water in the past decades, such as chemical precipitation [9], sedimentation [10], flocculation [11], adsorption [12], ultrafiltration [13], ion exchange [14], chemical coagulation [15], and so on. Being effective and operationally simple, adsorption is a useful method for removal of hexavalent chromium, solving the problems of sludge disposal [16,17].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

Liu

et al. 2018

Sustainability

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A low-cost biochar was prepared through slow pyrolysis of banana pseudostem biowaste at different temperatures, and characterized by surface area and porosity analysis, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). It was shown that the biochar prepared at low pyrolysis temperature was rich in oxygen-containing groups on the surface. Adsorption experiments revealed that the biochar prepared at 300 °C (BB300) was the best adsorbent for Cr(VI) with 125.44 mg/g maximum adsorption capacity at pH 2 and 25 °C. All the adsorption processes were well described by pseudo-second-order and Langmuir models, indicating a monolayer chemiadsorption. Furthermore, it was demonstrated that adsorption of Cr(VI) was mainly attributed to reduction of Cr(VI) to Cr(III) followed by ion exchange and complexation with the biochar.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

Liu

et al. 2018

Sustainability

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“…Since chromium is the main problem in this process, most treatments for these waters focus on the reduction and reuse of this element, followed by treatment for COD, BOD and TDS. These technologies include chemical coagulation processes [ 76 , 77 ] electrocoagulation [ 78 ], absorption, advanced oxidation processes [ 79 ] and biological processes such as phytoremediation [ 13 , 14 ].…”

Section: Technologies For the Treatment Of Tannery Wastewatermentioning

confidence: 99%

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

2021

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The tannery industry is one of the economic sectors that contributes to the development of different countries. Globally, Europe and Asia are the main producers of this industry, although Latin America and Africa have been growing considerably in recent years. With this growth, the negative environmental impacts towards different ecosystem resources as a result of the discharges of recalcitrated pollutants, have led to different investigations to generate alternative solutions. Worldwide, different technologies have been studied to address this problem, biological and physicochemical processes have been widely studied, presenting drawbacks with some recalcitrant compounds. This review provides a context on the different existing technologies for the treatment of tannery wastewater, analyzing the physicochemical composition of this liquid waste, the impact it generates on human health and ecosystems and the advances in the different existing technologies, focusing on advanced oxidation processes and the use of microalgae. The coupling of advanced oxidation processes with biological processes, mainly microalgae, is seen as a viable biotechnological strategy, not only for the removal of pollutants, but also to obtain value-added products with potential use in the biorefining of the biomass.

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“…The presence of these substances leads to high chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (SS), conductivity, and so on. In this process, a large amount of organic and inorganic chemicals are discharged, causing widespread water and soil pollution [1] There are many ways to minimize the pollution of tannery wastewater, such as electrocoagulation [2], chemical coagulation [3], advanced oxidation processes [4], adsorption process [5], membrane processes [6], biological treatment [7], and ion exchange [8]. Compared with other concentration and separation methods, the main advantage of the membrane treatment is that concentration and separation can be achieved, in most instances, without the use of chemicals or thermal energy and a state change [9], and membrane technology is ecologically friendly.…”

Section: Introductionmentioning

confidence: 99%

“…There are many ways to minimize the pollution of tannery wastewater, such as electrocoagulation [ 2 ], chemical coagulation [ 3 ], advanced oxidation processes [ 4 ], adsorption process [ 5 ], membrane processes [ 6 ], biological treatment [ 7 ], and ion exchange [ 8 ]. Compared with other concentration and separation methods, the main advantage of the membrane treatment is that concentration and separation can be achieved, in most instances, without the use of chemicals or thermal energy and a state change [ 9 ], and membrane technology is ecologically friendly.…”

Section: Introductionmentioning

confidence: 99%

Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior

Huang

et al. 2021

Membranes

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Ultrafiltration is a promising, environment-friendly alternative to the current physicochemical-based tannery wastewater treatment. In this work, ultrafiltration was employed to treat the tanning wastewater as an upstream process of the Zero Liquid Discharge (ZLD) system in the leather industry. The filtration efficiency and fouling behaviors were analyzed to assess the impact of membrane material and operating conditions (shear rate on the membrane surface and transmembrane pressure). The models of resistance-in-series, fouling propensity, and pore blocking were used to provide a comprehensive analysis of such a process. The results show that the process efficiency is strongly dependent on the operating conditions, while the membranes of either PES or PVDF showed similar filtration performance and fouling behavior. Reversible resistance was the main obstacle for such process. Cake formation was the main pore blocking mechanism during such process, which was independent on the operating conditions and membrane materials. The increase in shear rate significantly increased the steady-state permeation flux, thus, the filtration efficiency was improved, which resulted from both the reduction in reversible resistance and the slow-down of fouling layer accumulate rate. This is the first time that the fouling behaviors of tanning wastewater ultrafiltration were comprehensively evaluated, thus providing crucial guidance for further scientific investigation and industrial application.

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Effect of Chemical Coagulation Pretreatment on Anaerobic Digestion of Tannery Wastewater

Cited by 23 publications

References 18 publications

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior

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