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[Technology of sewage sludge hygienization].
Zentralblatt Fur Bakteriologie, Mikrobiologie Und Hygiene. 1. Abt. Originale B, Hygiene
|September 1, 1983
Summary
Pasteurization of sewage sludge faces challenges with pathogen regrowth. Pre-pasteurization combined with methane digestion offers a viable solution, while novel biological methods show promise for improved sludge treatment.
Area of Science:
- Environmental Engineering
- Microbiology
Context:
- Sewage sludge hygienization is mandated by regulations like the Swiss Sewage Sludge Decree (1981).
- Previous attempts at post-pasteurization failed due to significant pathogen regrowth.
- Existing thermal pre-pasteurization methods require further optimization for permanent hygienization.
Purpose:
- To evaluate the effectiveness of different sewage sludge hygienization techniques.
- To identify sustainable and efficient methods for pathogen reduction in sewage sludge.
- To explore novel biological processes for improved sludge treatment.
Summary:
- Post-pasteurization of sewage sludge is ineffective due to pathogen regrowth.
- Pre-pasteurization followed by methane digestion is a functional method for sludge hygienization.
- A novel two-stage biological process (aerobic thermophilic fermentation and anaerobic digestion) shows potential for enhanced sludge treatment.
- Other methods like sludge drying, composting, irradiation, and chemical treatments are also discussed.
Impact:
- Highlights the limitations of post-pasteurization in sewage sludge treatment.
- Validates the efficacy of pre-pasteurization and methane digestion for pathogen control.
- Introduces a promising biological two-stage process for improved sludge hygienization, thickening, and energy efficiency.
- Provides a comprehensive overview of various sludge treatment technologies and their hygienization capabilities.