Diatomite strengthen COD and ammonia removal from an micro-aerobic EGSB reactor treating coking wastewater

• Published in: IOP conference series. Earth and environmental science Vol. 191; no. 1; pp. 12075 - 12086
• Main Authors: Dong, C J, Lv, B N
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 05.11.2018
• Subjects: Ammonia; Coke; Coking; Diatomaceous earth; Hydraulic retention time; Phenols; Reactors; Retention time; Thiocyanates; Wastewater treatment
• ISSN: 1755-1307; 1755-1315; 1755-1315
• DOI: 10.1088/1755-1315/191/1/012075

The performance of one-stage micro-aerobic MAEGSB (OMAEGSB) reactor and two-stage MAEGSB (TMAEGSB) reactor treating actual coking wastewater with and without supplement of diatomite were investigated. The investigation has demonstrated that the two-stage MAEGSB reactor system treating actual coking wastewater could keep high COD and NH3-N removal with supplement of diatomite. With only 24h hydraulic retention time (HRT) (12h for MAEGSB I and 12h for MAEGSB II ), when without diatomite supplement, the TMAEGSB reactor system could attain 72.6% COD average removal and 25.8% NH3-N average removal. However, with 6g*L−1*d−1 diatomite supplement, the TMAEGSB reactor system could keep 84.3% COD average removal and 78.8%-92.8% NH3-N average removal. Such high NH3-N removal efficiency of the TMEGSB was because of the high phenol and thiocyanate (SCN) removal in the MAEGSB I reactor (97.9% and 77.9%) and correspondingly the low influent phenol and SCN concentration for the MAEGSB II reactor (33.9 mg*L−1 and 10.4 mg*L−1). Diatomite supplement could ensure stable and highly efficient phenol and SCN removal in the MAEGSB I reactor. Using TMAEGSB reactor system with diatomite supplement was a simple and high effectively strategy for treatment of actual coking wastewater.