AI Article Synopsis
- More wastewater treatment plants (WWTPs) are being upgraded to tertiary treatment to meet stricter discharge standards for pollutants, including contaminants of emerging concern (CECs).
- This study analyzed two retrofitted WWTPs, CD and JM, which achieved overall CEC removal efficiencies of 73.79% and 93.63%, respectively, while also releasing significant amounts of CECs into the environment.
- The research highlights that most CECs were removed during biological treatment, and the results were used to assess the SimpleTreat model's effectiveness in predicting CEC behavior in WWTPs.
Article Abstract
More and more previously designed wastewater treatment plants (WWTPs) are upgraded to tertiary treatment to meet the higher effluent discharge standards of conventional pollutants. Contaminants of emerging concern (CECs) can cause adverse effects on organisms and usually flow into WWTPs along with urban sewage. How the retrofitted WWTPs targeting conventional pollutants will influence the treatment efficiency of CECs is seldom discussed. This study investigates the removal of CECs in two full-scale newly retrofitted WWTPs (CD and JM WWTPs), containing high-efficiency sedimentation tank and denitrification deep bed filter for enhancing total nitrogen removal. The overall CEC removal efficiencies in the CD and JM WWTPs were 73.79 % and 93.63 %, respectively. Mass balance results indicated that CD WWTP and JM WWTP release a total of 36.89 and 88.58 g/d of CECs into the environment through effluent and excess sludge, respectively. Analysis of the concentration of CECs along the treatment process revealed most CECs were removed in the biological treatment units. The incorporation of newly constructed tertiary treatment proved beneficial for CEC removal and removed 2.93 % and 2.36 % CECs, corresponding to CEC removal of 2.92 and 27.49 g/d in the CD and JM WWTPs, respectively. The data of this study were further used to evaluate the suitability of the SimpleTreat model for simulating the fate of CECs in WWTPs. The predicted fraction of CECs discharged through the biological treatment effluent were generally within ten-fold difference from the measured results, highlighting its potential for estimating CEC removal in WWTPs.
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| http://dx.doi.org/10.1016/j.envres.2024.118344 | DOI Listing |
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