ENSC 2001 Lecture Notes - Lecture 10: Low-Level Waste, Nuclear Fission Product, Disinfectant
9 Dec 2017
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Document Summary
Including reduction, recycling, reuse, composting, landfill, and incineration. Three rs approach: reduction, recycle, reuse (reducing urban refuse by 50%) More notable success with recycling, but less with reducing waste production. 95% of environment damage has already occurred before recycling. Combining sustainable use of materials with resources conservation. Industrial ecosystem: producing natural urban and industrial ecosystem through material management, waste from one part of the system as resource for another part. Sewage (wastewater + contained solid waste): largest volume of liquid waste. Water flow in septic tank, solids sink down to the bottom of the tank and decomposed by bacteria. Then water flow in drain field (which is unsaturated and well oxidized for maximum efficiency) and the filtered water can be used for agriculture: waste treatment plants. Existing wastewater treatment generally has two or three stages: primary treatment, remove 30% to 40% of the pollutants. Screening: remove the grit composed of sand ,stones, and other large particles.
