Effects of Ventilation on Sewage Sludge Composting

By using positive forced aeration with different ventilation, sewage sludge was tested in sewage sludge composting. Temperature, moisture, organic matter, pH, ammonium and Germination Index (GI) were investigated. The ratio of sewage sludge and additives was 1:2 and the aeration rates of two composting piles were 1.2m3/ (h·t) and 2.4m3/ (h·t). After the composting, the moisture descended to 50% or so and the organic matter was under 45%. In addition, the pH was acidic and the ammonium was 0.4mg/g or so. The GI was more than 80%. The parameters tested during composting met the maturity requirements of Disposal of sludge from municipal wastewater treatment plant-Control standard for agricultural use.