Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, 3201 S Dearborn St, Chicago, IL 60616, USA.
Water Res. 2010 Oct;44(18):5306-15. doi: 10.1016/j.watres.2010.06.066. Epub 2010 Jul 17.
Plants aiming to achieve very low effluent nutrient levels (<3 mg N/L for N, and <0.1 mg P/L for P) need to consider removal of effluent fractions hitherto not taken into account. Two of these fractions are dissolved organic nitrogen (DON) and dissolved non-reactive phosphorus (DNRP) (mainly composed of organic phosphorus). In this research, enhanced coagulation using alum (at doses commonly employed in tertiary phosphorus removal) followed by microfiltration (using 0.22 μm pore size filters) was investigated for simultaneous effluent DON and dissolved phosphorus (DP) fractions removal. At an approximate dose of 3.2 mg Al(III)/L, corresponding to 1.5 Al(III)/initial DON-N and 3.8 Al(III)/initial DP-P molar ratios, maximum simultaneous removal of DON and DP was achieved (69% for DON and 72% for DP). At this dose, residual DON and DP concentrations were found to be 0.3 mg N/L and 0.25 mg P/L, respectively. Analysis of the trends of removal revealed that the DNRP removal pattern was similar to that commonly reported for dissolved reactive phosphorus. Since this study involved intensive analytical work, a secondary objective was to develop a simple and accurate measurement protocol for determining dissolved N and P species at very low levels in wastewater effluents. The protocol developed in this study, involving simultaneous digestion for DON and DNRP species, was found to be very reliable and accurate based on the results.
旨在实现极低出水中营养物水平（N 为<3mg/L，P 为<0.1mg/L）的植物需要考虑去除迄今未被考虑到的出水中的部分。其中两个部分是溶解有机氮（DON）和溶解非反应性磷（DNRP）（主要由有机磷组成）。在这项研究中，使用明矾（在三磷去除中常用的剂量下）进行强化混凝，然后进行微滤（使用 0.22μm 孔径的过滤器），以去除同时去除出水中的 DON 和溶解磷（DP）部分。在约 3.2mg Al(III)/L 的近似剂量下，对应于 1.5 Al(III)/初始 DON-N 和 3.8 Al(III)/初始 DP-P 的摩尔比，实现了 DON 和 DP 的最大同时去除（DON 为 69%，DP 为 72%）。在此剂量下，残余 DON 和 DP 的浓度分别为 0.3mgN/L 和 0.25mgP/L。对去除趋势的分析表明，DNRP 的去除模式与通常报道的溶解反应性磷相似。由于这项研究涉及大量的分析工作，因此次要目标是开发一种简单而准确的测量方案，用于在废水中非常低的水平下测定溶解的 N 和 P 物种。本研究中开发的方案涉及 DON 和 DNRP 物种的同时消化，根据结果发现该方案非常可靠和准确。
