School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China.
School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China.
Chemosphere. 2020 Jul;251:126442. doi: 10.1016/j.chemosphere.2020.126442. Epub 2020 Mar 7.
This study aimed to compare the effectiveness of MAER and L20 resin for the adsorption treatment of secondary effluent, and evaluate the applicability of ozone oxidation for the reuse of desorption eluate. Bench-scale adsorption experiments showed that the MAER resin exhibited higher efficiency than L20 resin in removal of COD within 600 treated bed volumes (BV), which declined from 32.5% to 14.1% in the first and sixth treatment loading of 100 BV. On the other hand, the L20 resin displayed obviously higher removal efficiency of total nitrogen (TN) than MAER resin within 600 BV, which dropped from 74.6% to 9.8% at the same condition. The ozone oxidation treatment could achieve desirable reuse of desorption eluate, although its chemical oxygen demand (COD) concentration increased gradually in line with the reuse numbers. The uptake of COD, TN and total phosphorus declined steadily by using ozone treated eluate as the regenerant in successive adsorption-desorption cycles, but increased obviously with a new batch of regenerant. Overall, the resin adsorption could efficiently remove organic and inorganic matters from secondary effluent, while the treatment loop including desorption eluate oxidation and eluate reuse could markedly enhance the concentration ratio of treated effluent.
本研究旨在比较 MAER 和 L20 树脂对二级出水的吸附处理效果，并评估臭氧氧化对解吸洗脱液再利用的适用性。中试吸附实验表明，在处理 600 个床体积（BV）内，MAER 树脂对 COD 的去除效率高于 L20 树脂，在第一个和第六个 100BV 的处理负荷下，其去除率从 32.5%下降到 14.1%。另一方面，在相同条件下，L20 树脂对总氮（TN）的去除效率明显高于 MAER 树脂，从 74.6%下降到 9.8%。臭氧氧化处理可以实现解吸洗脱液的理想再利用，尽管其化学需氧量（COD）浓度随着再利用次数的增加而逐渐增加。在连续的吸附-解吸循环中，使用臭氧处理的洗脱液作为再生剂时，COD、TN 和总磷的去除率呈稳步下降趋势，但使用新一批再生剂时，去除率明显增加。总的来说，树脂吸附可以有效地从二级出水中去除有机和无机物质，而包括解吸洗脱液氧化和洗脱液再利用在内的处理循环可以显著提高处理出水的浓度比。
