Revitalizing Rural Sewage Sludge: A New Path to Green Fertilizer

In a fascinating study, scientists modified sewage sludge from an enhanced membrane coagulation process. They tried out different alkaline conditions, temperatures, and time durations to see what worked best. The ideal mix turned out to be a high pH level, a warm temperature of 55°C, and a full day of pre-treatment. This combo broke down the solid waste into a more usable form and released lots of phosphorus. When this pre-treated sludge was used in biogas reactors, it produced more methane gas over time.

The mix of microbes inside the reactors changed from bacteria that break down sugar and protein to other types that love warmth and a specific bacteria named Run-SP154. One type, Methanothrix, was very common and stayed that way. Another type, Methanolinea, grew over time. Amazingly, when this treated sludge was used to grow mulberry plants, they did better than with regular chemical fertilizers. This shows a promising way to handle sewage in small, decentralized systems.

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