Controlling factors of excess sludge on adsorbing trace typical pharmaceuticals

doi:10.11949/j.issn.0438-1157.20170137

Abstract

Abstract:

Conventional biological systems in centralized wastewater treatment plants (WWTPs) are presently inefficient in the removal of pharmaceutical and personal care products (PPCPs), resulting in their ubiquitous presence in excess sludge by absorption. When the sludge is utilized in agricultural land, the absorbed PPCPs may be released and then water environment is contaminated. Therefore, it becomes a crucial issue to predict and assess the content of PPCPs in excess sludge, by revealing the controlling factors of PPCPs adsorption. The adsorption properties of three typical pharmaceuticals onto the sludge from a certain WWTP in Beijing, were investigated based on a trace concentration level using UPLC-MS-MS. The adsorption capacity of ciprofloxacin (CIP) and sulfamethoxazole (SMX) decreased, however, that of acetaminophen (ACP) increased with increasing pH; because the speciation of pharmaceuticals in aqueous solution and zeta potential of biosolid are as a function of pH. Extracellular polymeric substance (EPS) could enhance the adsorption of three typical pharmaceuticals onto the sludge, independent of pH; because the metal ions and organic substances contained in EPS determine the adsorption of pharmaceutical onto the sludge.

Key words: pharmaceutical and personal care products, excess sludge, adsorption, extracellular polymeric substance, metal ion, organic substance

摘要：

传统的污水处理工艺不能完全去除药物和个人护理用品（PPCPs），可能通过吸附作用存在于剩余污泥中。当污泥经土地或农业利用，其中含有的PPCPs可能释放出来，污染水环境，因此，揭示PPCPs经污泥吸附去除的影响因素，对于预测或评估污泥中PPCPs含量尤其重要。以北京某污水处理厂剩余污泥为对象，利用高效液相色谱-质谱联用仪，研究了痕量浓度下3种典型药物在污泥中的赋存特性。随pH增大，环丙沙星与磺胺甲唑的吸附容量减小，而扑热息痛的吸附容量增加；主要是因为pH不仅改变药物在水中的存在形态，而且影响微生物细胞体的表面电位。胞外聚合物（EPS）对污泥吸附3种典型药物均有促进作用，且不依赖于pH；主要是因为EPS中含有的金属离子与有机物成分决定污泥吸附药物性能。

关键词: 药品和个人护理用品, 剩余污泥, 吸附, 胞外聚合物, 金属离子, 有机物

CLC Number:

X523

CAO Daqi, WANG Zhen, HAO Xiaodi, WANG Qunhui. Controlling factors of excess sludge on adsorbing trace typical pharmaceuticals[J]. CIESC Journal, 2017, 68(8): 3266-3274.

曹达啟, 王振, 郝晓地, 汪群慧. 剩余污泥吸附痕量典型药物影响因素[J]. 化工学报, 2017, 68(8): 3266-3274.

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