Purpose and Scope

Hazardous waste is often defined as waste material that everyone wants picked up but no one wants put down. The legal and scientific definitions have become more complex as more compounds are found and more is learned about the toxicity of compounds and elements. The Resource Conservation and Recovery Act (RCRA) hazardous waste regulations (40 CFR ยง261 1987) provide the legal definition of hazardous waste. This definition is not always clear because the regulations are written in language general enough to apply to all possible situations, including unusual terminology, several exemptions, and exclusions.

The purpose of this section is to present the various definitions of hazardous waste in a manner useful to the environmental engineer. To be a hazardous waste, material must first conform to the definition of waste; second, it must fit the definition of solid waste; and third, it must fit the definition of hazardous waste. The environmental engineer must test the material against each of these definitions. This section assumes that the generator can demonstrate whether the material is indeed a waste.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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