HUANGXiao-xia,QIU-Zhao-fu,CAO-Guo-min,et al.Removal of Antibiotics from Dairy Farm Wastewater by Modified SBR Process[J].China Water & Wastewater,2022,38(2022 1 1):9-15.
Removal of Antibiotics from Dairy Farm Wastewater by Modified SBR Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
9-15
Column:
Date of publication:
2022-01-01
- Keywords:
- modified SBR process; dairy farm wastewater; antibiotics; alkalinity
- Abstract:
- Organic matter and antibiotics in dairy farm wastewater are detrimental to their return to the field. Therefore, a modified SBR (plug-flow SBR) process with anoxic zone was applied to treat the dairy farm wastewater produced intermittently under the condition of dry manure cleaning, and the removal of antibiotics by the process was investigated. When COD, NH4+-N, TN and TP concentrations in the influent were 1 234-4 696 mg/L, 768-1 365 mg/L, 880-1 370 mg/L and 5.62-12.02 mg/L respectively, after treatment by modified SBR process, the effluent COD was decreased to 401-544 mg/L, the effluent NH4+-N was always less than 10 mg/L, the average loss rate of TN was 22.38%, and TP was basically not removed. The total concentration of sulfonamide and β?lactam antibiotics in the dairy farm wastewater ranged from 3.84 μg/L to 4.48 μg/L, and the total removal efficiency of the two kinds of antibiotics by the modified SBR process reached 72.97%-90.82%. The modified SBR process also had good removal performances to 10 kinds of sulfonamide antibiotics with high concentrations (50 μg/L for each, 500 μg/L in total), and the removal efficiency reached 95.75%-95.97%. Biodegradation was the main pathway to remove sulfonamide and β?lactam antibiotics from dairy farm wastewater. In addition, the removal of sulfonamide antibiotics had an important relationship with the breaking of S—N bonds in their molecular structure. Under the condition that COD removal was not affected, the dosage of alkalinity could be reduced by adjusting the return flow of mixed liquid or the inflow of the reactor, thus reducing the operational cost.
Last Update:
2022-01-01