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. 2020 Oct 23;6:43. doi: 10.1038/s41522-020-00152-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — The system is composed by a tank of 25 L connected to a source of local tap water, a float valve which controls the entrance of water to the tank, a diaphragm pump to create a constant flow (5.3 L/min), and one Bio-inline bioreactor with 12 lead coupons. Ball valves and gate valves were added to control the flow through the system, and two drains (one principal and one for emergency), were installed to renew the water inside the tank twice per day (flow of 35 mL/min). The scale is indicated as a line in the lower right corner of the figure, corresponding with 10 cm.