مرکز منطقه ای اطلاع رساني علوم و فناوري - An Alternative Approach to the Stabilization of Sewage Sludge: Vermistabilization

Abstract :

The use of wastes in agriculture, forestry and land reclamation is increasingly being identified as an important issue for soil fertility and conservation. Using wastes in agriculture not only helps to dispose these materials economically, but also reduces negative effects of them on environment. Evaluation of waste for not to cause new pollutions, is a prerequisite for the functioning of ecosystem. Sewage sludge is a concentrated suspension of solids, largely composed of organic matter and nutrientladen organic solids. In addition to major plant nutrients in its content, sewage sludge also contains trace elements that are essential for plant growth. To ensure the application of sludge onto agricultural lands in a beneficial and environmentally acceptable manner, stabilization is a must. The raw sludge is named as sewage sludge only after stabilization process.Stabilization of sludge undoubtedly increases both the investment and cost operations of the treatment plants and ignored by many treatment plants. This study was prepared to evaluate effectiveness of an economic and easy stabilization method, vermistabilization, as an alternative to the existing sludge stabilization methods.