Department of Civil, Construction and Environmental Engineering, North Carolina State University, Campus Box 7908, Raleigh, NC, United States; Department of Civil and Environmental Engineering, Southern Methodist University, PO Box 750340, Dallas, TX, United States.
Department of Civil, Construction and Environmental Engineering, North Carolina State University, Campus Box 7908, Raleigh, NC, United States.
Waste Manag. 2015 Feb;36:191-6. doi: 10.1016/j.wasman.2014.11.014. Epub 2014 Dec 12.
A number of sulfate-containing wastes are disposed in municipal solid wastes (MSW) landfills including residues from coal, wood, and MSW combustion, and construction and demolition (C&D) waste. Under anaerobic conditions that dominate landfills, the sulfate can be reduced to hydrogen sulfide which is problematic for several reasons including its low odor threshold, toxicity, and corrosive nature. The overall objective of this study was to evaluate existing protocols for the quantification of total leachable sulfate from solid samples and to compare their effectiveness and efficiency with a new protocol described in this study. Methods compared include two existing acid extraction protocols commonly used in the U.S., a pH neutral protocol that requires multiple changes of the leaching solution, and a new acid extraction method. The new acid extraction method was shown to be simple and effective to measure the leaching potential of sulfate from a range of landfill disposed sulfate-containing wastes. However, the acid extraction methods do not distinguish between sulfate and other forms of sulfur and are thus most useful when sulfate is the only form of sulfur present.
许多含硫酸盐的废物被处置在城市固体废物（MSW）垃圾填埋场中，包括煤、木材和 MSW 燃烧以及建筑和拆除（C&D）废物的残渣。在主导垃圾填埋场的厌氧条件下，硫酸盐可以还原为硫化氢，这由于其低气味阈值、毒性和腐蚀性而成为一个问题。本研究的总体目标是评估现有的从固体样品中定量测定总可浸出硫酸盐的方法，并将其与本研究中描述的新方法进行比较。比较的方法包括两种在美国常用的现有酸提取方法、一种需要多次更换浸出溶液的中性 pH 方法，以及一种新的酸提取方法。新的酸提取方法被证明是一种简单有效的方法，可以测量一系列来自垃圾填埋场处置的含硫酸盐废物的硫酸盐浸出潜力。然而，酸提取方法无法区分硫酸盐和其他形式的硫，因此在仅存在硫酸盐的情况下最有用。
