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Removal of organic pollutants by contact oxidation of biological carbon sludge
Author(s) -
Song Wuchang,
Ren Yanglong,
Jia Ruibao,
Zhao Liang,
Chen Faming,
Zhu Zhaoliang
Publication year - 2020
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 - 10.1002/wer.1318
Subject(s) - chemistry , pollutant , carbon fibers , environmental chemistry , organic matter , turbidity , biodegradation , dissolved organic carbon , total organic carbon , adsorption , degradation (telecommunications) , water treatment , waste management , environmental engineering , environmental science , organic chemistry , materials science , ecology , composite number , computer science , engineering , composite material , biology , telecommunications
A pilot‐scale (5 m 3 /day) study was conducted for the treatment of micro‐polluted low‐turbidity water using a biological contact oxidation high‐density sedimentation tank system with biochar sludge. First, the best operating conditions were found through system debugging; then, biological characteristics were investigated during system debugging; and finally, the performance in terms of pollutant elimination was investigated. The carbon sludge tank biomass was stable, which provided good stability for the removal of organic matter in raw water. The average reduction in absorbance of UV 254 and total organic carbon were 36.71% and 29.63%, respectively, when compared with conventional coagulation. The adsorption and degradation of the mixture comprising carbon and sludge played an important role in removing organic pollutants; most of the humic and fulvic acid content of the water was removed during the coagulation processes. Practitioner points The contact oxidation of biological carbon sludge system can effectively treat low‐turbidity water. The extracellular polymeric substances and the filamentous bacteria connecting the structure provided good settling for the carbon sludge mixture. The adsorption and degradation of the mixture comprising carbon and sludge played an important role in removing organic pollutants. With the carbon sludge reflux, organic matter with molecular weight >30K and 10K–3K was greatly reduced. The contact oxidation of biological carbon sludge system was successful in reducing the concentrations of DBPs and their precursors.