After treatment, the effluent may be discharged leaving a mixture of water, organic solids and chemicals, nutrients, heavy metals, and inorganic ions. This sludge can be further treated and the resulting biosolids can then be applied to the land as a fertilizer, sent to landfill or incinerated.In this work, an Agilent 4200 MP - AES was used to deter mine major and minor elements in domestic sludge, following microwave digestion.