Effluent dissolved organic nitrogen and dissolved phosphorus removal by enhanced coagulation and microfiltration

Water Research
Marina Arnaldos, Krishna Pagilla

Abstract

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 ...Continue Reading

Citations

Apr 11, 2018·Critical Reviews in Biotechnology·Saurabh Jyoti Sarma, Joo-Hwa Tay
Jan 25, 2020·Environmental Science and Pollution Research International·Qi XuJiakuan Yang
May 8, 2018·Environmental Science and Pollution Research International·Li ZhangKechen Xu
Jul 9, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Nicholas B TookerApril Z Gu
May 5, 2021·The Science of the Total Environment·Ruchi JoshiEakalak Khan
Apr 19, 2019·Environmental Science & Technology·Xin ZhangGuo-Ping Sheng

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