Organic sludge volume has been increasing since a while in European Union (EU)/Rest of the World (ROW) due to strengthened legal environment across the region, this process is specially observed in EU countries driven by major investment cycle since 1990 closing the gap in sewage treatment and supporting large foreign manufacturing capacity investments into their regions. The paper discusses different strategies for the disposal of sewage sludge, particularly the “traditional disposal/reuse” and “waste to energy” strategies. Recommends to apply full cycle for energy conversion to balance out the huge electricity usage under sewage treatment processes.
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