[Treating high strength antibiotic wastewater by micro-aerobic hydrolysis and acidification process].
The effect of micro-aerobic hydrolysis and acidification to high strength antibiotic wastewater treatment is studied. The results demonstrate that micro oxygen enhanced the physiological metabolizability of facultative hydrolytic and acidogenic bacteria, and aerating stirring improved the hydraulic condition. Degree of acidification (AD) and volatile fatty acid (VFA) in the effluent reached 58.64% and 4825 mg/L with the shortest HRT 10 h and the maximal OLR 20 kg/(m3 x d), respectively. Wastewater biodegradability was improved greatly and rising BOD5/COD was about 17%, which offered good substrate for post aerobic treatment. The effluent quality was relative stable with the fluctuant influent, and COD and SS were 7000-8000 mg/L and 150-300 mg/L, respectively, while the removal efficiencies of COD and SS were 15%-30% and 90%-95%. The changement of VFA lagged behind that of AD in the effluent, and AD would represent the effect of hydrolysis and acidification process more properly. The sludge bed in the bottom of the reactor was the main reaction field for VFA production, and the height of the reactor for stable VFA production increased with the increase of OLR. The filling field mainly aimed to entrap SS in the effluent and benefited little to VFA production. Sludge in the reactor was mainly little sludge particles with the size of 0.5-1.0 mm and flocculent sludge.
Qi
Pei-shi
PS
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Ding
Lei
L
Liu
Yun-zhi
YZ
D000900:Anti-Bacterial Agents; D001673:Biodegradation, Environmental; D004345:Drug Industry; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*
D000900:Anti-Bacterial Agents; D005232:Fatty Acids, Volatile; D007220:Industrial Waste