Contamination of water is caused due to discharge of waste water from industries and households into surface waters like ponds, rivers, seas and oceans. The various methods of contamination of waste water require a variety of strategies to remove the pollution. The process of removing unwanted chemicals, biological contaminants, suspended solids and gases from contaminated water is called as water purification. The technologies can be designed to provide low cost sanitation and environmental protection. The various laboratory test methodologies are waste water quality indicators. They are used to assess suitability of waste water for disposal or re-use. Tests calculate the physio-chemical and biological characteristics of the waste water. Graphene: A new activator of sodium persulfate for the advanced oxidation of parabens in water is a recent research emerging in the field of waste water purification.