The Treatment Of Bromoamine Acid Wastewater By The Bioaugmented SMBR-Fenton Process

The purpose of this dissertation is to establish a new technology to treat bromoamineacid (BAA) wastewater, combined the sequencing batch membrane bioreactor (SMBR)bioaugmented by sphingomonas xenophaga QYY with the Fenton process.The optimal cultivation method is that the concentration of BAA is increased graduallyin influent after adding bacteria agent to the active sludge with the dosage of 6ï¼…, and theaddition of Streptomycin sulfate in SMBR can improve the decolorization rate of BAA at thehigher concentration.The characteristics of the augmented SMBR during the phases of acclimation, stableoperation are studied, respectively. The results indicate that bioaugmentation can acceleratethe startup of the MBR and maintain relatively stable operation. During the startup phase, theconcentration of activated sludge decreases; the settle and flocculation ability are becomingbetter; the dehydrogenase activity declines and keeps at a low level, and the concentrations ofprotein and carbohydrate in EPS increase. The system can run steadily for over 3 months atthe concentration of 550mg/L BAA after one-month acclimation. The BAA decolorizationrate can reach about 98ï¼…, and the COD removal is about 50ï¼…within 11h. The results ofRISA fingerprint analysis indicate that the genetic diversity of the microbial communitydecrease and the BAA degrading functional community is developed and strain QYY maydominate in the activated sludge community in the steady phase.The system can run steadily under the conditions, with COD: P=100:1～2.5, pH=6～8,w(NaCl)=0％～2ï¼…, p(BAA)=200～2600mg/L,ρ(FeCl₃)=1.0mg/L, 30℃, aeration amount of3L/min, water discharge time of 5h, membrane flux of 0.015m/h and degradable time linearwithρ(BAA), t(h)=0.0109ρ(BAA)/_mg/L+4.413, (R²=0.9968). The degradability in SMBRprocess can be inhabited by the extra carbon and nitrogen source such as glucose andammonium sulphate.Impact of componential variations in influent on the SMBR is studied. The results showthat SMBR has strong impact resistance on the changes of the BAA concentration.The SMBR effluent is treated by Fenton reagent deeply. The results show that the finalCOD is 69.1mg/L, under the optical conditions, with pH=10.0, m(H₂O₂)/m(COD)=4.184, (H₂O₂)/n(FeSO₄)=10, original COD 291.2 mg/L, the reaction temperature over 20℃, 2 timesaddition of Fenton reagent and reaction time is 2.5h.The results indicate that the removal of COD and the decolorization rate of BAA reach90.0ï¼…and 99.9ï¼…respectively, treating with the 550mg/L BAA wastewater by the newestablished SMBR-Fenton process.