Sustainability Cluster, School of Engineering, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India.
Discipline of Civil Engineering, IIT Gandhinagar, Gujarat 382355, India.
Bioresour Technol. 2022 May;352:127054. doi: 10.1016/j.biortech.2022.127054. Epub 2022 Mar 26.
Emerging contaminants (ECs) are not completely removed by wastewater treatment owing to their capabilities of making complexes, toxic derivatives, byproduct formation, and dynamic partitioning. Negative contaminant removal i.e., higher concentrations (up to 5731%) of these ECs in the effluent with respect to the influent sampled on the same occasions, is globally prevalent in almost all types of treatment systems. Conventional WWTPs showed the highest negative removal (NR) for Carbamazepine, and Carbadox. Conjugation-deconjugation, types of WWTPs, transformations, leaching, operational parameters, sampling schemes, and nature of substance governs the NR efficiencies. Among the various categories of micropollutants, pesticides and beta-blockers are reported to exhibit the maximum percentage of NR, posing threat to human and the environment. With > 200% of NR for beta-blockers, low blood-pressure related symptoms may likely to get more prevalent in the near future. Study red-flags this phenomenon of negative removal that needs urgent attention.
新兴污染物 (ECs) 由于其形成配合物、产生有毒衍生物、副产物形成和动态分配的能力，无法在废水处理中完全去除。在全球范围内，几乎所有类型的处理系统中，都普遍存在这些 ECs 在出水中的浓度（高达 5731%）相对于同一时间采样的进水更高的负去除（NR）现象。传统的 WWTP 对卡马西平（Carbamazepine）和卡巴多（Carbadox）表现出最高的负去除。共轭-去共轭、WWTP 类型、转化、浸出、操作参数、采样方案和物质性质决定了 NR 效率。在各种类别的微污染物中，报告称农药和β-受体阻滞剂表现出最大的 NR 百分比，对人类和环境构成威胁。β-受体阻滞剂的 NR 超过 200%，可能在不久的将来，与低血压相关的症状会更加普遍。该研究警示了这种需要紧急关注的负去除现象。
