垃圾填埋场中矿物与温度交互影响下的硫酸盐还原行为

Sulfate reduction behavior under the interaction of minerals and temperature in landfill

填埋场是含硫恶臭气体产生的活跃场所,为厘清填埋场中自生矿物和温度交互影响下恶臭气体硫化氢(H_(2)S)的释放行为,本文探究了填埋场Fe_(3)O_(4)、Fe_(2)O_(3)和SiO_(2)3种常见无机矿物在25、35、45、55和65℃ 5个温度梯度下的H2S释放差异及成因.结果表明,温度在35℃以下,矿物对H_(2)S生成有抑制作用,尤其是铁矿物,最高抑制了53.04%的H_(2)S释放;在45~65℃范围内,矿物与温度协同促进H_(2)S释放且促进效果逐步增强.矿物与温度交互影响促进了有机质水解和硫酸盐还原,也促进了累积的多硫化物分解并增加了还原产物中S^(2-)占比,这些共同促进了H2S的产生.本研究探明的填埋场内部温度和矿物交互影响下的H_(2)S产排行为,可为填埋场源头控制恶臭污染提供一定理论依据.

Landfills are active sites for the production of sulfur-containing odor.In order to clarify the release behavior of hydrogen sulfide(H_(2)S)under self-generated minerals and the influence of temperature interaction in landfills,this study investigated the differences and causes of H_(2)S release in Fe_(3)O_(4),Fe_(2)O_(3),and SiO_(2),three common inorganic minerals,at 25℃,35℃,45℃,55℃,and 65℃.The results showed that below 35℃,the minerals had an inhibitory effect on H_(2)S generation,especially iron minerals,which inhibited up to 53.04%of H_(2)S release;within the temperature range of 45℃to 65℃,the minerals and temperature synergistically promoted H_(2)S release,and the promoting effect gradually increased.The interactive influence of minerals and temperature promoted organic matter hydrolysis and sulfate reduction,as well as the decomposition of accumulated polysulfides and increased the proportion of S^(2-)in the reduced products,all of which collectively promoted the production of H_(2)S.The H_(2)S production and emission behavior under the interactive influence of temperature and minerals inside landfills discovered in this study can provide a theoretical basis for odor pollution control at the source of landfills.