Treatment of biochemical tail water containing heterocyclic drugs by PAA/cobalt-loaded ceramic granule-based denitrification biofilter at low temperature
MA Jie, ZHU Shan-Shan, ZHANG Xu-Xiang, REN Hong-Qiang, HUANG Hui
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
Abstract：A cobalt-loaded ceramic granule-activated peracetic acid (PAA) system (the concentration of PAA was 150mg/L) was constructed in our previous study, and efficient degradations of typical heterocyclic drugs (sulfamethoxazole (SMX), sulfadiazine (SDZ), carbamazepine (CBZ) and trimethoprim (TMP), all of which were 20mg/L) were observed. In order to realize the in-situ upgrading of the function of denitrification biofilter, this study further explored the efficacy of PAA/cobalt-loaded ceramic granule-based denitrification biofilter in the treatment of biochemical tail water containing the above heterocyclic drugs at low temperature. Under the conditions of 15℃, 60mg/L COD, 20mg/L NO3--N and 20 μg/L of the four heterocyclic drugs in the influent, the dosage ratio of cobalt-loaded ceramic granule of 3%, and PAA concentration of 150 μg/L and 300 μg/L, the biofilter achieved good removal of total nitrogen (TN) and heterocyclic drugs and the reduction of effluent acute biotoxicity. The effluent TN met the requirements of first-class A discharge standard of China, and the average degradation rates of SMX, SDZ, CBZ and TMP were 67.20%, 75.17%, 80.90% and 70.26%, respectively. The acute biotoxicity of effluent increased with the shortening of HRT, while they all had low toxicity. The concentration of cobalt ion leached from the biofilter was lower than 1mg/L, which reached the requirements of surface water environmental quality standards of China. The distribution of microbial species was more even in the biofilter, and the key bacteria Paracoccus and Gordonia and the gene expression of napA, narG and nirK, played significant roles in the removal of heterocyclic drugs and TN. Without considering the operation cost of backwashing, the cost for advanced removal of per 5mg/L NO3--N (calculated by 1m3 wastewater) by the PAA/cobalt-loaded ceramic granule-based denitrification biofilter was 0.1567~0.3475Yuan (RMB) per cubic meter wastewater, showing a good technical and economic feasibility.
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