Which disposal method is used for liquid hazardous wastes by injecting them into the ground through disposal wells?

• A. Safe Drinking Water Act
• B. UV Exposure for Water Purification
• C. LifeStraw
• D. Liquid Hazardous Waste Disposal

Answer: (D)

Injecting liquid hazardous wastes into the ground through disposal wells is a process known as deep well injection. This method places the waste into deep, isolated rock formations well below the groundwater table, using well casings and cement to create multiple barriers that prevent leakage to surrounding soil and drinking water sources. It’s designed to keep hazardous liquids out of the accessible environment by placing them in formations with very low permeability, with continuous monitoring for pressure changes, potential leaks, and plume movement. The Underground Injection Control program, tied to the Safe Drinking Water Act, regulates where, how, and when these injections can occur to protect water supplies. Before disposal, wastes are characterized to ensure they are compatible with the chosen formation, and operations include ongoing checks to maintain containment. Other options listed aren’t disposal methods for liquid hazardous wastes: one references a drinking-water regulation, another is a treatment method using UV light, and another is a consumer filtration device; the scenario describes deep well injection as the disposal approach.