**2.2 Biological (organic) wastewater with sources**

Biological industrial wastewater is the by-product of large-scale chemical plants and other industrial operations that primarily use organic materials for chemical reactions. The organic components in the wastewaters have diverse properties and originate from various sources. After the wastewater has undergone the proper pretreatment, these can only be eradicated through biological treatment. Numerous organic industrial wastewaters are produced by the following sectors and locations:



**Table 1.** *Sources with contaminants.* *Remediation and Management of Sewage Sludge DOI: http://dx.doi.org/10.5772/intechopen.109408*

v.Leather and tanneries

vi.Textile industries [4].
