pH, Redox, and oxygen microprofiles in rhizosphere of bulrush (Scirpus validus) in a constructed wetland treating municipal wastewater

Biotechnology and Bioengineering
Achintya N Bezbaruah, Tian C Zhang

Abstract

Microenvironmental studies regarding plant oxygen release in a wastewater environment are important to understand the principles of constructed wetlands for wastewater treatment. pH, oxidation reduction potential (ORP), and dissolved oxygen (DO) microprofiles for the lateral and main roots of the bulrush (Scirpus validus) in a vertical flow constructed wetland fed with municipal wastewater were measured using microelectrode techniques. pH was found to be low (6.91-6.98) near the lateral root surface, indicating possible nitrification or H(+) extrusion. The ORP at the lateral root surface was between +250 and +317 mV and gradually reached the bulk solution ORP (+14 to -54 mV) at a radial distance of approximately 4,750 microm. DO values at the lateral root surface varied from 0.64-2.04 mg L(-1) as bulk biochemical oxygen demand (BOD) changed from 24 to 1,267 mg L(-1). DO at the lateral root surface and the thickness of the oxygen layer around the root marginally increased with an increase in bulk BOD, while ORP at the lateral and main root surface decreased. pH and DO values did not change near the main root and had the bulk solution values. The results of this study provide insights into root-induced microenvironments and would...Continue Reading

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Citations

Mar 3, 2010·Applied Microbiology and Biotechnology·Guibing ZhuChengqing Yin
Jul 23, 2013·Environmental Science and Pollution Research International·Haiming WuXiaoli Xu
Apr 30, 2014·Environmental Science and Pollution Research International·Jian ZhangJinlin Fan
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Oct 11, 2019·Environmental Science. Processes & Impacts·Tao ChenLihua Sun
Nov 2, 2017·Engineering in Life Sciences·Luciana Schultze-NobrePeter Kuschk
Feb 8, 2020·Journal of Environmental Health Science & Engineering·Suhail N AbedMiklas Scholz
Mar 4, 2005·Biotechnology and Bioengineering·Achintya N Bezbaruah, Tian C Zhang
Oct 13, 2018·The Science of the Total Environment·Jan P RuppeltJohannes Pinnekamp
Dec 14, 2007·Environmental Science & Technology·Jin-Hwan LeeIan Papautsky
Jul 3, 2019·Environmental Science & Technology·Shubiao WuHans Brix
Jun 16, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Sandeep K MalyanRajesh Singh

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