The Character Changes and Maturity of Sewage Sludge Aerobic Co-composting with Various Bulking Agents
不同填充料污泥好氧堆肥的性质变化及腐熟度

In Aerobic co-composting of four bulking agents and de-watered sewage sludge, the records of temperature, moisture, organic matter, pH and conductivity with time showed the composting could be successfully processed. The changes of chemical parameters, water soluble organic carbon, nitrate, ammonium and biological parameter Cress Germination Index(GI) with time during the composting process were investigated. Ammonium concentration was found to be an important chemical factor affecting Cress Germination Index and had significant negative correlation with GI which could be used as a good index of compost maturity in this study. The value of ammonium which changed with the initial components in composting would be 0.5-1.4 mg/g at the end of the processes in all composts.