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Water 2017, 9(3), 160; doi:10.3390/w9030160

Sludge Dewatering and Mineralization in Sludge Treatment Reed Beds

Department of Bioscience, Aarhus University, Ole Worms Allé 1, 8000 Århus C, Denmark
Academic Editor: Yung-Tse Hung
Received: 6 November 2016 / Revised: 18 December 2016 / Accepted: 21 February 2017 / Published: 24 February 2017
(This article belongs to the Special Issue Constructed Wetlands for Water Treatment: New Developments)
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Abstract

Sludge Treatment Reed Beds (STRBs) are widely used in Northern Europe to dewater and mineralize surplus sludge from activated sludge systems used to treat urban domestic sewage. STRBs are low-technology, energy-efficient, and do not require addition of chemicals. They dewater and stabilize the sludge and produce a final product that can be safely used as a fertilizer for agricultural crops. Long-term sludge reduction takes place in the reed beds due to dewatering and mineralization of the organic matter in the sludge. Although, in theory, a simple technique relying largely on natural processes, experience has shown that it is very important to understand and respect the basic design and operation requirements of STRBs. This paper describes the basic design and operation requirements of STRBs, with special focus on pivotal requirements to respect in order to secure proper functioning. Also, the paper summarizes performance experience concerning final dry matter content, degree of mineralization, emission of greenhouse gases, and degradation of micro-pollutants in STRBs. There are still a number of outstanding issues that are not fully understood, particularly in relation to the importance of the sludge quality for the dewatering in an STRB. Therefore, extreme care should be taken when attempting to extrapolate the use of STRBs to applications and regions outside of their ‘normal’ and documented area of application. View Full-Text
Keywords: biosolids; activated sludge; constructed wetland; treatment wetland; methane emission; Phragmites australis; sludge dewatering; sludge stabilization biosolids; activated sludge; constructed wetland; treatment wetland; methane emission; Phragmites australis; sludge dewatering; sludge stabilization
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This 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. (CC BY 4.0).

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Brix, H. Sludge Dewatering and Mineralization in Sludge Treatment Reed Beds. Water 2017, 9, 160.

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