Correction to: Environ. Process. (2018) 5:667–681

https://doi.org/10.1007/s40710-018-0310-y

The article Unit Energy Consumption as Benchmark to Select Energy Positive Retrofitting Strategies for Finnish Wastewater Treatment Plants (WWTPs): a Case Study of Mikkeli WWTP, written by Khum Gurung, Walter Z. Tang and Mika Sillanpää, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 7 June 2018 without open access.

With the author(s)’ decision to opt for Open Choice the copyright of the article changed on November 2018 to © The Author(s) 2018 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/ ), which permits use, duplication, 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 original article has been corrected.