Treatment of Distillery Spent‐Wash by Ozonation and Biodegradation: Significance of pH Reduction and Inorganic Carbon Removal Before Ozonation

Abstract

This study is aimed at exploring strategies for mineralization of refractory compounds in distillery effluent by anaerobic biodegradation/ozonation/aerobic biodegradation. Treatment of distillery spent-wash used in this research by anaerobic-aerobic biodegradation resulted in overall COD removal of 70.8%. Ozonation of the anaerobically treated distillery spent-wash was carried out as-is (phase I experiments) and after pH reduction and removal of inorganic carbon (phase II experiments). Introduction of the ozonation step resulted in an increase in overall chemical oxygen demand (COD) removal, with the highest COD removals of greater than 95% obtained when an ozone dose of approximately 5.3 mg ozone absorbed/mg initial total organic carbon was used. The COD removal during phase II experiments was slightly superior compared with phase I experiments at similar ozone doses. Moreover, efficiency of ozone absorption from the gas phase into distillery spent-wash aliquots was considerably enhanced during phase II experiments. Water Environ. Res., 78, 994 (2006).

Distillery spent wash treatment technologies: A case study of the comparative efficiency of aerobic and anaerobic treatment processes

“…The minimum, maximum and average COD removal was observed 38.9%, 44.2% and 42.1% respectively in aerobic treatment while 54.9%, 58.1% and 56.6% in anaerobic treatment. Our results are in accordance with that of Kumar et al (2006), Kumar et al (2020) and Mise et al (2013) The Kjeldahl method consisting of three steps viz. digestion, distillation and titration is a method of quantification of the nitrogen content in different soil and water samples.…”

Advances in Environmental Pollution Management: Wastewater Impacts and Treatment Technologies

“…The minimum, maximum and average COD removal was observed 38.9%, 44.2% and 42.1% respectively in aerobic treatment while 54.9%, 58.1% and 56.6% in anaerobic treatment. Our results are in accordance with that of Kumar et al (2006), and Mise et al (2013) The Kjeldahl method consisting of three steps viz. digestion, distillation and titration is a method of quantification of the nitrogen content in different soil and water samples.…”

“…and 72.2% respectively in aerobic treatment while 71.7%, 75.9% and 73.7% in anaerobic treatment. More or less similar results were obtained by Banu et al (2007) and Kumar et al (2006). The minimum, maximum and average acidity was observed 1650mg/L, 2220mg/L and 2027.0mg/L±165.0 in RAW-DSW while 695mg/L, 867mg/L and 754.4mg/L±52.0 with aerobic treatment and 80mg/L, 760mg/L and 577.0mg/L±121.1 with anaerobic treatment.…”

Photodegradation of spent wash, a sugar industry waste, using vanadium-doped TiO2 nanoparticles

“…In continuation of our efforts to study the application potential of V-TiO 2 for the degradation of other harmful substances, we used V-TiO 2 for the degradation of spent wash, i.e., waste from the sugar distillery industry, and Jakox red (HE 8BN) dye. The electrochemical decolourization and biodegradation of an electrochemically decolourised dye were studied by Sathishkumar et al 39 and Yadav et al 40 Treatment of distillery spent wash by ozonation and biodegradation and the signicance of pH reduction and the removal of inorganic carbon were reported by Kumar et al 41 The use of an AFBBR and an adsorption technique for the treatment of spent wash colour was studied by Lakshmikanth et al 42 Although many processes have been employed for the decolourization of spent wash, each process has its own advantages and disadvantages. Many processes are costly and economically unviable.…”