Civil Engineering Department, North China Institute of Aerospace Engineering, Langfang 065000, China.
Shandong Institute of Geophysical and Geochemical Exploration, Jinan 250013, China.
J Environ Sci (China). 2019 Feb;76:57-64. doi: 10.1016/j.jes.2018.03.025. Epub 2018 Mar 29.
Endocrine disrupting chemicals (EDCs) in the secondary effluent discharged from wastewater treatment plants are of great concern when water reuse is intended. Ozonation and ultrafiltration (UF) are powerful technologies reported to eliminate EDCs. Due to the importance of effluent organic matters (EfOMs) in secondary effluent, the effects of three kinds of EfOM on the treatment of five EDCs using ozonation and UF were investigated. The three kinds of EfOM studied were humic acid sodium salt (NaAH), bovine serum albumin (BSA) and sodium alginate (NaAg); and the five EDCs were estrone, 17β-estradiol, estriol, 17α-ethynyl estradiol and bisphenol A. The results showed that EfOM accelerated the decay rate of ozone and inhibited the degradation efficiency of EDCs by ozonation in the order NaAH>BSA>NaAg. The ultraviolet absorbance at 280nm (UVA) has potential for use as a surrogate indicator to assess EDC removal via ozonation without conducting difficult EDC analyses. When the decline in UVA exceeded 18%, the five EDCs had been completely removed. The UF behavior of NaAH, BSA and NaAg was found to follow the cake filtration law. The fouling potential of EfOM followed the order NaAg>NaAH>BSA; while EfOM on the membrane surface enhanced EDC removal in the order NaAH>BSA>NaAg. The mean retention rate of the membrane was increased by 24%, 10% and 8%, respectively. The properties of EDCs and EfOM cakes both influenced the EDC removal rates due to adsorption, size exclusion and charge attraction.
废水处理厂排放的二级出水（secondary effluent）中的内分泌干扰化学物质（endocrine disrupting chemicals，EDCs）在考虑水再利用时引起了极大的关注。臭氧氧化和超滤（ultrafiltration，UF）是两种被报道可以去除 EDCs 的强大技术。由于二级出水中的出水有机物（effluent organic matters，EfOMs）非常重要，因此研究了三种 EfOM（腐殖酸钠盐（humic acid sodium salt，NaAH）、牛血清白蛋白（bovine serum albumin，BSA）和海藻酸钠（sodium alginate，NaAg））对臭氧氧化和 UF 处理五种 EDCs 的影响。这五种 EDCs 分别为雌酮（estrone）、17β-雌二醇（17β-estradiol）、雌三醇（estriol）、17α-乙炔基雌二醇（17α-ethynyl estradiol）和双酚 A（bisphenol A）。结果表明，EfOM 按 NaAH>BSA>NaAg 的顺序加速了臭氧的衰减速率，并抑制了臭氧氧化对 EDCs 的降解效率。280nm 处的紫外吸光度（ultraviolet absorbance at 280nm，UVA）具有作为替代指标来评估通过臭氧氧化去除 EDCs 的潜力，而无需进行困难的 EDC 分析。当 UVA 下降超过 18%时，五种 EDCs 已被完全去除。发现 NaAH、BSA 和 NaAg 的 UF 行为遵循滤饼过滤定律。EfOM 的污染潜力按 NaAg>NaAH>BSA 的顺序排列；而 EfOM 在膜表面上增强了 EDC 去除的顺序为 NaAH>BSA>NaAg。膜的平均保留率分别增加了 24%、10%和 8%。由于吸附、尺寸排除和电荷吸引，EDCs 和 EfOM 滤饼的性质都影响了 EDC 去除率。
