硝酸钙对河流底泥中含硫化合物嗅味原位控制

以硝酸钙作为氧化剂，对深圳河污染底泥典型嗅味物质AVS（酸挥发性硫化物）和GEM（土臭素）及2 MIB（2 甲基异莰醇）进行原位控制. 结果表明，当硝酸钙投加量（以单位质量AVS所需NO3- N质量计）为1.68 g/g，AVS去除率达到92%，且可有效避免硝酸钙向上覆水释放，适合工程应用. 但是，硝酸钙对河流底泥GEM和2 MIB等典型嗅味物质的原位控制效果较差. 硝酸钙能够引起底泥中微生物多样性增加，16S rDNA指纹图谱显示，优势菌株包括去除AVS的脱氮硫杆菌(Thiobacillus thioparus)，反硝化细菌(Simplicispira sp.和Rhodanobacter sp).以及降解有机物的菌株(Simplicispira sp.、Lysobacter sp.、Pseudoxanthomonas sp.)等. 

In Situ Control of Odor in Sulfide Containing Compounds with Calcium Nitrate in River Sediments

In-situ control of the typical odor compounds acid volatile sulfide(AVS),geosmin(GEM) and 2-methylisoborneol(2-MIB) in polluted sediments of Shenzhen River was conducted using calcium nitrate as the oxidant.The results showed that the injection(mass of Nitrate nitrogen) of 1.68 g/g calcium nitrate could obtain 92% removal of AVS,and its release into the overlaying water could be prevented,making it very suitable for practice use.However,the controlling effects of calcium nitrate on GEM and 2-MIB were less than that on AVS.Application of the calcium nitrate resulted in enhancement of microbial diversity in the sediments.According to the 16S rDNA fingerprint,the dominant bacterial species in the sediments were identified as Thiobacillus thioparus strains which removed AVS,the denitrification bacteria Simplicispira sp.and Rhodanobacter sp.,as well as Simplicispira sp.,Lysobacter sp.and Pseudoxanthomonas sp.,which decomposed the organic matter.