hexavalene chromium Similar issues apply to flows emissions reported using gener
ID: 287221 • Letter: H
Question
hexavalene chromium Similar issues apply to flows emissions reported using general cerms such as "particulates" for emission or "sodium bydrexide solution."Information on the specif e chemical composition of emisions, as well as the size of parriculanes and the conceneracion of solutions, are needed to properly classify and characterie posential impacts. a detailed, thorough, and it process data is essential to support t ent proceshw diagram is important for r anal to developing modeling. The pr provides a valuable bl un based LCAs and more accurate impact rtment municating the scope and system boundaries for a the receiving environmental For emissions, should be indicared, if known. ISO 14044 names 'emissions to air water and soil as sop-level classificati methods can require farther spec ion, bur LCIA the life cycle inventory analysis and impact assesmn proce sources are also critical for a high-qualiry study, Preu 4 PROBLEM EXERCISES ification of compartments in tailed descriptions and documentation of the uni which distinctions can be mude berwen rdles to freshwater sea wacer. Similarly, atmospheric emissions can and releases so be further distinguished berween releases to regions with high population density and releases to areas of low population densiy Reporting by sub-compartments helps improve impact to/from nature) and which are intermediate fows assessment modeling For example, human exposures (and asanother technosphere process). If classified as i 1. Ildentify which processes are elementary flows di tol/from sociared buman health impacts) for a given amount of a specific briefly explain why Elementary Intermediate-Intermediate, why? Bauxite ore, in ground, at mine site Iron ore, at blast furnace Trees, standing, in forest Corn plant, in field Wood chips, at sawmill Corn grain, at wet mill Limestone, crushed, at mine site Coal, in ground Crushed coal, at utility plant Electricity, from coal, at generating facility Grid electricity, at Tap water input to washing operation River water, at plant inlet Stack emissions to scrubber Vehicle tailpipe emissions Fugitive methane from landfill Methane emissions to flare CO2 from methane flare Spent plating solution to treatment plantExplanation / Answer
ELEMENTARY INTERMEDIATE IF INTERMEDIATE, WHY? Bauxite ore, in ground, at mine site yes Iron ore at blast furnace yes iron is extracted from iron ore in blast furnace. Thus it belongs to a SB under a new Product system Trees, standing in forest yes Corn plant in field yes Wood chips at sawmill yes part of the SB where the timber is fed to a product line Corn grain at wet mill yes extracting corn starch and other by products limestone, crushed at mine site yes coal in ground yes crushed coal at utility plant yes to be used as production energy electricity from coal at generating facility yes this is not lightning from nature; a commercial by-product grid electricity at manufacturing plant yes source of production energy tap water input to washing operation yes River water at plant inlet yes stack emissions to scrubber yes the gases can be further aborbed and adsorbed, not crossing the effective SB vehicle tallpipe emissions yes fugitive methane from landfill yes methane emissions to flare yes production line input co2 from methane flare yes Spent plating solution to treatment plant yes can be recovered and reutilised
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