Economic evaluation of sewer sludge treatment and disposal

Marjainé Szerényi, Zsuzsanna – Molnár, Ferenc – Vermes, László – Bisztriczky, József

Keywords: sewer sludge treatment, -disposal, costs-returns analysis, agricultural disposal of dehydrated sludge

According to cost-return analysis on long term basis the three technologies examined can be ranked as follows:
- The utilization of dehydrated sewer sludge in agriculture is the most favourable method of disposal, although its advantages are apparent only after 13 years of application.
- The second place goes to the agricultural utilization of liquid sewer sludge by injection techniques regarded as the basic method.
- The agricultural disposal of dehydrated sludge represents the most favourable approach if costs and returns to the entire society in parts at least are included into the analysis.

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