Occurrence, removal, and mass balance of contaminants of emerging concern in biological nutrient removal-based sewage treatment plants: Role of redox conditions in biotransformation and sorption

被引：15
作者：
Dubey, Monika [1 ]
Rajpal, Ankur [1 ]
Vellanki, Bhanu Prakash [1 ]
Kazmi, Absar Ahmad [1 ]
机构：
[1] Indian Inst Technol, Dept Civil Engn, Roorkee 247667, Uttarakhand, India
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 808卷
关键词：
Biological wastewater treatment; Emerging contaminants; Mass balance; Redox conditions; Sewage sludge; WASTE-WATER TREATMENT; PERSONAL CARE PRODUCTS; AEROBIC MEMBRANE BIOREACTOR; TRACE ORGANIC-COMPOUNDS; ACTIVATED-SLUDGE; PHARMACEUTICALS; FATE; DEGRADATION; BIODEGRADATION; ENVIRONMENT;
D O I：
10.1016/j.scitotenv.2021.152131
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The study investigates the fate of 20 contaminants of emerging concern (CECs) in two full-scale wastewater treatment plants (WWTPs) based on the BiodeniphoTM (WWTP 1) and anaerobic-anoxic-oxic (WWTP 2) processes. Samples of both the dissolved and solid phases (particulate and sludge) from all the wastewater and sludge processing-related units were studied using the mass balance approach to understand the distribution of CECs. The total mass load removal efficiency for anti-inflammatory (4), antibiotics (4), and hormones (5) was 76, 46, 93%, and 72, 38, 90% from WWTP 1 and 2, respectively. The mass load analysis showed that 8.3 kg and 6.5 kg of targeted contaminants enter the treatment plants per day while 0.35 kg and 0.32 kg are discharged along with effluent, and 1.5 g and 7.7 g (dry weight) are released through sludge in WWTP 1 and 2, respectively. Both biodegradation and sorption mechanisms depended on the redox conditions. Ammonia oxidizing conditions favoured the most for the biotransformation, followed by anaerobic and nitrate-reducing conditions. The study stresses the need for separate redox conditions for optimum removal of CECs and advanced tertiary treatment to remove recalcitrant compounds. The results help better understand the removal mechanisms of the CECs in BNR treatment.
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页数：11
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