The purification sludge generated at wastewater treatment facilities can be in the form of a semi-solid or liquid. This sludge is odorous and it is generated in result of various purification methods. Purification sludge can be classified under three main groups according to output sources. Purification sludge can be converted into useable material after passing through certain processes.

Industrial waste grade purification sludge is generated in result of purification of industrial wastewater. In addition, there are also wastewater treatment facilities operated by local governments. These are related to household purification mus. In addition there are also types of purification sludge generated from treatment centers involved in use of potable water.

What are the properties of purification sludge?
The types of purification sludge generated in result of wastewater treatment facility procedures can have different properties. The elements determining the characteristic properties of these types of sludge is related to the water content. In addition, the utilized treatment process is also important in this regard.

The types of purification sludge have certain chemical, physical and biological properties. Physical properties of wastewater purification musts include the solid content of the sludge, as well as the odor and temperature of the must. In addition the color of the sludge is also another physical property.

When discussing chemical properties of the types of wastewater purification sludge, one of the important factors is the inorganic and organic matter content dissolved or suspended in the waste water. The most important feature of chemical parameters is the fact that they help indicate which function is the most suitable end use for a certain type of purification sludge. These parameters help decide whether a certain type of purification sludge is suitable for use for agricultural purposes. Another important data point for types of purification sludge is their biological characteristics. Various groups of organisms are found in purification sludge. In addition to bacteria, certain viruses, plants, algae and other microorganisms can be found in this sludge.

The importance of biological parameters in regard of the types of purification sludge is the fact that they provide data regarding whether these types of sludge can be safely used. Decisions on where to utilize such waste sludge can be made in light of said data. Whether certain types of purification sludge contains hazardous wastes must be determined before their disposal. Wastewater purification sludge is subject to various processed before disposal. One of these processes is biological sedimentation, while another application is known as chemical sedimentation. Biological and physical treatment methods are preferred for household wastewaters. On the other hand chemical treatment methods are more suitable for industrial wastewaters.