Feasibility of a two-stage biological aerated filter for depth processing of electroplating-wastewater.
A "two-stage biological aerated filter" (T-SBAF) consisting of two columns in series was developed to treat electroplating-wastewater. Due to the low BOD/CODcr values of electroplating-wastewater, "twice start-up" was employed to reduce the time for adaptation of microorganisms, a process that takes up of 20 days. Under steady-state conditions, the removal of CODcr and NH(4)(+)-N increased first and then decreased while the hydraulic loadings increased from 0.75 to 1.5 m(3) m(-2) h(-1). The air/water ratio had the same influence on the removal of CODcr and NH(4)(+)-N when increasing from 3:1 to 6:1. When the hydraulic loadings and air/water ratio were 1.20 m(3) m(-2) h(-1) and 4:1, the optimal removal of CODcr, NH(4)(+)-N and total-nitrogen (T-N) were 90.13%, 92.51% and 55.46%, respectively. The effluent steadily reached the wastewater reuse standard. Compared to the traditional BAF, the period before backwashing of the T-SBAF could be extended to 10days, and the recovery time was considerably shortened.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Engineering Center of Water Treatment and Water Environmental Remediation, Ministry of Education, Nanjing University, Nanjing, PR China. yongboliu@163.com
Bo
B
Liu
Dongdong
D
Yan
Qi
Q
Wang
Song
S
Li
Shaogui
S
Yang
Wenfei
W
Wu
D000332:Aerobiosis; D000388:Air; D018533:Biomass; D019149:Bioreactors; D004595:Electroplating; D005240:Feasibility Studies; D005374:Filtration / Q000295:instrumentation*; D009566:Nitrates / Q000302:isolation & purification; D010100:Oxygen / Q000302:isolation & purification; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification; D014865:Waste Disposal, Fluid; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000295:instrumentation*
D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D014867:Water; D010100:Oxygen