不同原位处理对黑臭底泥污染物抑制效果分析

ANALYSIS ON BLACK-ODOR SEDIMENT POLLUTANT INHIBITION EFFECT OF DIFFERENT IN-SITU TREATMENT METHODS

为掌握不同原位处理对黑臭底泥污染物释放抑制效果的差异从而指导工程实践,于2015年12月11日-2016年1月28日采用室外模拟实验,研究了硝酸钙(Ca(NO3)2)、过氧化钙(CaO2)及沸石3种材料以5种不同原位处理方式对黑臭底泥污染物释放的抑制效果。实验期间,各处理对CODMn抑制效果顺序为:沸石+CaO2>CaO2>空白>沸石+Ca(NO3)2>Ca(NO3)2,对TP抑制效果顺序为:沸石+Ca(NO3)2>Ca(NO3)2>沸石+CaO2>CaO2>沸石>空白,对NH3-N抑制效果顺序为:沸石+Ca(NO3)2>沸石+CaO2>沸石>CaO2>Ca(NO3)2>空白。研究结果表明:上述实验材料均可抑制底泥污染物释放但效果不一,且同种处理对不同污染物抑制效果也不尽相同。沸石覆盖的加入大大加强了单一材料对黑臭底泥污染物抑制的效果,但各实验材料对污染物抑制效果均具有时效性,随着药效衰退抑制效果会逐渐减弱,因此在工程实践中应根据需要选择合适处理方式及定期补充材料以持续发挥抑制作用。

In order to know the pollutant release inhibition effect of different in-situ treatments on black-odor sediment and guide the engineering practice, from December 11, 2015 to January 28, 2016, outdoor large glass cylinder simulation experiment was conducted. The inhibition effects of five different in-situ treatment methods of calcium nitrate (Ca(NO 3) 2), calcium peroxide (CaO 2) and zeolite on the black-odor sediment pollutants were studied. The inhibition effect of each treatment method on COD Mn in the experimental period was in the order of zeolite+calcium peroxide>calcium peroxide>blank>zeolite+calcium nitrate>calcium nitrate, and the inhibition effect on TP was in the order: zeolite+calcium nitrate>calcium nitrate> zeolite+calcium peroxide>calcium peroxide>zeolite>blank, the inhibition effect on NH 3-N was in the order of zeolite+calcium nitrate>zeolite+calcium peroxide>zeolite>calcium peroxide>calcium nitrate>blank. The results showed that: the experimental materials above all could inhibit the release of sediment pollutants, but they had different effect, and the same treatment method had different inhibition effects on different pollutants. The addition of zeolite capping greatly enhanced the inhibition effect of single material on black-odor sediment pollutants, the inhibition effect of each experimental material on pollutants had time-effectiveness, and with the decline in efficacy of materials, the inhibition effect would be weakened. Therefore, it was required to choose appropriate treatment method according to the needs and supplement materials regularly to continue to play the role of inhibition.