Aspects on Anaerobic Digestion of Municipal Sludge, Some Aspects on its Sustainability and Possible Enhancements
Journal of Water Resources and Ocean Science
Volume 8, Issue 2, April 2019, Pages: 21-27
Received: Apr. 8, 2019; Accepted: May 23, 2019; Published: Jun. 10, 2019
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Stig Morling, Sweco Environment and affiliated to Royal Institute of Technology (KTH), Stockholm, Sweden
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The anaerobic treatment of organic rich pollutants has a very long history within the water industry. Two major applications have been used: Treating sludge streams from midsized and large wastewater treatment plants and for industrial wastewater streams containing high concentrations of organic carbon. This paper presents the status of anaerobic digestion of sludge streams in municipal wastewater. The paper highlights both the potentials and limitations of the technology. Further the alternative or complementing HTC-technology is presented and analyzed. The constraints, limitations and options for the reuse of processed municipal sludge is accordingly pointed out. Our usage of water is found more and more complex, along with the addition of a number of synthetic agents, such as pharmaceuticals and other complex polluting agents we find that the traditionally acknowledged sludge treatment stabilization methods are not sufficient. The paper points out that the anaerobic digestion may be combined with for instance the HTC-process. In a longer perspective the HTC may even replace the current anaerobic digestion. However, the HTC-technology will raise further interesting questions: The important points that need further investigations are inter alia: 1) To further clarify the quality of reject water from the hydrochar, with respect to rest pollutants. 2) To evaluate to what extent the HTC process may become a feasible way to disintegrate pharmaceutical remains found in municipal sludge. 3) How to further enhance the ways to recover raw materials from the hydrochar, such as phosphorus and carbon. Nethertheless, the process may allow for some very promising pathways within the future municipal sludge management.
Sludge Digestion, Solids Retention Time, Primary Sludge, Waste Activated Sludge, SRT, Biogas Gas Production, HTC, Carbon, Phosphorus Recovery
To cite this article
Stig Morling, Aspects on Anaerobic Digestion of Municipal Sludge, Some Aspects on its Sustainability and Possible Enhancements, Journal of Water Resources and Ocean Science. Vol. 8, No. 2, 2019, pp. 21-27. doi: 10.11648/j.wros.20190802.12
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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