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Tailored water treatment using enhanced primary clarification for nutrient recovery and production of water for turfgrass irrigation

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Abstract

An emerging strategy for urban water infrastructure includes distributed water supply, storm water management, and wastewater treatment to manage water within a utility basin. The use of reclaimed water to offset intra-basin water demand for irrigation can be a key component of such a strategy—landscape irrigation is estimated to account for up to 70% of total potable water demand. Fertigation (i.e., irrigation with nutrient-rich water) with reclaimed water is able to offset fertilizer and potable water requirements, which provides an added benefit to end-users. However, research exploring fertigation water production in a decentralized setting is sparse. Two studies to produce high-nitrogen water using a sequencing batch reactor have been described in the literature. While nitrogen concentrations were increased, the changes in treatment resulted in a very low pH in the bioreactor (<5.0) and an increase in blower energy consumption (6.1–7.0%), or required substantial changes to the treatment operation. The research presented here demonstrates a new strategy, enhanced primary clarification coupled with a sequencing batch reactor (EPC-SBR) to produce nutrient-rich water with a balanced nitrogen–phosphorus ratio for turfgrass fertigation. The EPC-SBR system was operated for 114 days and produced water with an average inorganic nitrogen concentration of 13.9 mg N L−1 and an average N : P ratio of 10.5 : 1, without substantial increase in blower energy use or extreme modifications to the SBR operations.

Graphical abstract: Tailored water treatment using enhanced primary clarification for nutrient recovery and production of water for turfgrass irrigation

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Publication details

The article was received on 18 Jan 2017, accepted on 10 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7EW00019G
Citation: Environ. Sci.: Water Res. Technol., 2017, Advance Article
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    Tailored water treatment using enhanced primary clarification for nutrient recovery and production of water for turfgrass irrigation

    D. F. Ramey, J. Munakata-Marr and T. Y. Cath, Environ. Sci.: Water Res. Technol., 2017, Advance Article , DOI: 10.1039/C7EW00019G

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