WaterWorld | By: William Steel | March, 2019:
Note: This article is Part 3 of a series. Read about the three part series here.
One of the most encouraging aspects to the Danish water landscape is found in its having fostered some of most compelling displays of sustainable wastewater management in the world. Indeed, already in operation at several wastewater treatment plants (WWTPs) around the country are solutions securing results that just a decade ago might have been dismissed as outlandish.
To be sure, of the hundreds of foreign water industry stakeholders who visit these facilities every year, most leave in clear awe of what they see and learn.
There is good reason for the favorable impression that people depart with. Not only have many facilities demonstrated routes to securing energy neutrality — a claim many more Danish plants are working towards — a number are significantly net positive by way of a combination of energy consumption reduction initiatives and onsite energy production capabilities.
Remarkably, Marselisborg WWTP in Aarhus produces up to 70% more energy than it uses. Energy is sent to consumers in the form of green electricity and heat; making Marselisborg the world’s most energy efficient treatment plant.
Here, the generation of power from anaerobic digestion of sludge is complemented with production of heat which is supplied to district heating networks. It is, to be clear, a remarkable state of affairs given that within just a lifetime, wastewater treatment within many of those same municipalities represented the largest single source of energy consumption in their region.
And yet the story does not end there. While nascent in its development, considerable gains have been made in the field of resource recovery from wastewater streams.
To read the full article (Part III in this series) – please click here.