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Pretreatment of Wastewater from Licorice Processing—A Preliminary Evaluation
Author(s) -
Ramaswami Sreenivasan,
Behrendt Joachim,
Gulyas Holger,
Otterpohl Ralf
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14733681695249
Subject(s) - powdered activated carbon treatment , effluent , chemical oxygen demand , chemistry , wastewater , activated sludge , anaerobic digestion , adsorption , pulp and paper industry , activated carbon , biochemical oxygen demand , sewage treatment , anaerobic exercise , waste management , chromatography , environmental chemistry , environmental science , environmental engineering , methane , organic chemistry , biology , physiology , engineering
This study was performed as a preliminary investigation of anaerobic digestion and the activated sludge process as pretreatment options for highly loaded wastewater from licorice processing (approximately 8000 mg COD/L). Only 15% reduction of initial chemical oxygen demand (COD) was achieved by anaerobic digestion, whereas up to 80% reduction was attained with activated sludge process. Adsorption using powdered activated carbon (PAC) was studied for the removal of color and residual organics from the effluent of aerobic treatment. The combination of aerobic biological treatment with activated carbon adsorption offers a high‐quality effluent, however only at very high carbon dosage (>2 kg PAC/m 3 ).