Impact of enhanced stabilization treatments on sludge quality and methane recovery

摘要

1. Continued increased level of sewer connection and wastewater treatment ⇒ increased production of sewage sludge, which will need proper management; 2. Increased treatment of sludge before recycling to land through anaerobic digestion and other biological treatments, like composting. The use of raw sludge will no longer be acceptable; 3. Potential increased restrictions on types of crops being allowed to receive treated sludge; 4. Enhanced production and utilisation of biogas; 5. Production of alcohols and other fuels directly from sewage sludge using pyrolysis and gasification; 6. Similar proportion of treated sludge recycled to agriculture at around 40- 50% by 2020. 7. Phasing out sludge being sent to landfill due to EC restrictions on organic waste going to landfill and increased dislike by the public of use of landfill disposal. 8. main alternative to landspreading is likely to continue to be incineration (where land suitable for recycling is unavailable) 9. Increased attention to climate change and mitigation of greenhouse gas emissions ⇒ recognised additional benefits of sludge use on land 10. Increased attention to recovery of organic nutrients, including those in sludge.