Educator

  HAZARDOUS WASTE TREATMENT   Hazardous waste treatment involves various processes to reduce the toxicity, volume, or concentration of hazardous substances to minimize their impact on human health and the environment.  Different treatment method include:   Physical method: The physical method involves the separation or removal of hazardous components from waste streams through the process of sedimentation or filtration.    Chemical treatment: Chemical processes to treat hazardous waste include some of the processes like neutralize, oxidize, reduce, or otherwise change the composition of hazardous waste.   Biological method: Microorganisms break down organic hazardous wastes during aerobic or anaerobic conditions. Some of the methods are composting, aerobic and anaerobic decomposition, activated sludge, enzyme treatment, etc.   Thermal method: High temperatures are used to destroy hazardous waste. Incineration, boiling, auto...

  CHARACTERISTICS OF HAZARDOUS WASTES   The Environmental Protection Agency of America (EPA) defines the characteristics of hazardous waste as:     1. IGNITABILITY: The waste that explodes with the application of fire, electricity spark, or any source of heat; wastes with high ignitable potential or which burn vigorously and persistently. Such waste has a flash point of less than 600C. Examples of these types of wastes are :- solvent washes, waste oil, alcohols, aldehydes, paint wastes, petroleum wastes, cleaning solvents, etc.  2.CORROSIVITY: It is the ability of the waste to cause skin and mucosal membrane damage, burns and erosions and dissolve or corrode metallic surfaces. Such wastes have pH value of 2.512.5 at normal room temperatures (250 C). The corrosion rate for material damage is at 0.625 meters per year at 550 C.   Examples: acid sludge, battery acid wastes, caustic wastewater, alkaline cleaning wastes, rust remover waste, etc. 3.REA...