Wastewater treatment in molasses-based alcohol distilleries for COD and color removal: A review

Satyawali, Yamini; Balakrishnan, Malini

doi:10.1016/j.jenvman.2006.12.024

Cited by 406 publications

(230 citation statements)

References 95 publications

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“…A concentration of 5.85 g L -1 is assumed to cause 50% inhibition of acetoclastic methanogens due to a neutralization of the cell membrane potential from the passive influx of ions (Appels et al 2008, Chen et al 2008. Hence, molasses are often diluted prior to their treatment to avoid digester failure (Satyawali and Balakrishnan 2008).…”

Section: Discussionmentioning

confidence: 99%

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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Anaerobic digestion (AD) is a well-established technology for energy recovery from organic waste streams. Several studies noted that inserting a bioelectrochemical system (BES) inside an anaerobic digester can increase biogas output, however the mechanism behind this was not explored and primary controls were not executed. Here, we evaluated whether a BES could stabilize AD of molasses. Lab-scale digesters were operated in the presence or absence of electrodes, in open (no applied potential) and closed circuit conditions. In the control reactors without electrodes methane production decreased to 50% of the initial rate, while it remained stable in the reactors with electrodes, indicating a stabilizing effect. After 91 days of operation, the now colonized electrodes were introduced in the failing AD reactors to evaluate their remediating capacity. This resulted in an immediate increase in CH 4 production and VFA removal. Although a current was generated in the BES operated in closed circuit, no direct effect of applied potential nor current was observed. A high abundance of Methanosaeta was detected on the electrodes, however irrespective of the applied cell potential. This study demonstrated that, in addition to other studies reporting only an increase in methane production, a BES can also remediate AD systems that exhibited process failure. However, the lack of difference between current driven and open circuit systems indicates that the key impact is through biomass retention, rather than electrochemical interaction with the electrodes.

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Section: Discussionmentioning

confidence: 99%

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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“…The presence of phenols and melanoidins are responsible for the dark brown color [1,11,12]. Chemical characteristics of the stillage differ, depending on the bioethanol feedstock, including chemical oxygen demand (COD) (15-176 gO 2 /L), biological oxygen demand (BOD) (7-96 gO 2 /L), total nitrogen content (0.2-4.2 g/L), total phosphate content (0.2-3.0 g/L), potassium (0.9-17.5 g/L) and sulfate content (2-6 g/L) [12,13]. Treatments such as aerobic and anaerobic digestion, oxidation, adsorption, coagulation/ flocculation, membrane separation, evaporation can be used to reduce the organic load of the stillage.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most popular process is the anaerobic digestion of the stillage. This process removes and reduces the content of COD and BOD, converts half of the COD in biogas and 10% in sludge [11,12,14,15]. It can be successfully operated at high organic loading rates, low nutrient and energy requirements and stabilized sludge production [1,[5][6][7]12].…”

Section: Introductionmentioning

confidence: 99%

“…This process removes and reduces the content of COD and BOD, converts half of the COD in biogas and 10% in sludge [11,12,14,15]. It can be successfully operated at high organic loading rates, low nutrient and energy requirements and stabilized sludge production [1,[5][6][7]12]. Typical digestates from this type of treatment include among others total COD (around 55 g/L), sulfur based COD (around 10 g/L), nitrogen content (0.7-2.5 g/L) and phosphate content (1.5-10 g/l) [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Ozonation and Evaporation as Treatment Methods of Recycled Water for Bioethanol Fermentation Process

Fernandes

Boczkaj

Głazowska

et al. 2017

Waste Biomass Valor

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“…Various physical, chemical and biological techniques are used for the treatment of distillery spent wash before its discharge to the aqueous ecosystem [2], [3]. In biological treatment anaerobic treatment attractive in comparison to direct aerobic treatment due to high organic content of molasses present in spent wash [4].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Distillery Spentwash by Electrocoagulation

Khandegar¹,

Saroh²

2014

JOCET

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Abstract-Effluent from distilleries, known as spent wash, leads to extensive soil and water pollution. Removal of pollutants and color from distillery effluent is becoming increasingly important from environmental and aesthetic point of view. Effluent from distilleries contains certain recalcitrant compounds. In the present work effort were made to reduce chemical oxygen demand (COD) from distillery effluent by electrocoagulation. The maximum COD removal efficiency of 98% was obtained at solution pH of 7.2 with a current density 17.9 mA/cm 2 for electrolysis duration of 3 h. Further experiments were performed using aluminum sulphate as chemical coagulant to compare the COD removal efficiencies obtained by electrocoagulation and chemical coagulation.

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Wastewater treatment in molasses-based alcohol distilleries for COD and color removal: A review

Cited by 406 publications

References 95 publications

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Comparison of Ozonation and Evaporation as Treatment Methods of Recycled Water for Bioethanol Fermentation Process

Treatment of Distillery Spentwash by Electrocoagulation

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