CaO2原位处理河道黑臭底泥效能研究

EFFECTIVENESS OF IN SITU TREATMENT OF BLACK-ODOR RIVER SEDIMENT BY CaO2

CaO2已广泛应用于黑臭河道底泥原位处理中,但现有研究较多集中于CaO2对底泥中酸可挥发性硫化物(acidic volatile sulfide,AVS)的去除效果,缺乏对其他污染指标影响的研究。通过小试,考察了CaO2原位处理黑臭河道底泥AVS和有机物的效果,同时对底泥的颜色、ORP、pH和重金属含量及形态变化进行了检测。结果表明:CaO2原位处理黑臭河道底泥污染物具有明显的效果,AVS去除率可达98%以上,TOC含量可降低0.4%左右 同时底泥颜色由黑色转变为土黄色,ORP从-150 mV提高至100 mV左右,pH从中性变为碱性(pH=11左右)。投加CaO2对底泥重金属含量变化无影响,但会将底泥中部分较稳定形态存在的重金属转化为较不稳定化的赋存形态。

CaO2 has been widely used in the in-situ treatment of black-odor rivers sediment.However,most studies focused on the AVS(acidic volatile sulfide)removal effect from the sediment by CaO2,and those focused on other pollution indicators were rare.Through a pilot experiment,the effect of in situ treatment of AVS and organics in black-odor river sediment by CaO2 was investigated.Meanwhile,the color,ORP,pH,heavy metal content and morphology of the sediment were detected.The results showed that in situ treatment of black-odor river sediment pollutants by CaO2 had ideal performance,with the removal rate of AVS reaching 98%above and the content of TOC decreasing by about 0.4%.At the same time,the color of the sediment changed from black to earthen yellow,the ORP increased from-150 mV to about 100 mV,and the pH changed from neutral to alkaline(about pH=11).The addition of CaO2 had no effect on the change of heavy metal content in the sediment,but the heavy metals with relatively stable forms were converted into unstable forms.