Low-Carbon Water Environment Technology Research Center, School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China E-mail:
Water Sci Technol. 2021 May;83(9):2063-2074. doi: 10.2166/wst.2021.111.
The corrosion and odor in concrete sewers are mainly related to the sulfide production, which is, under certain circumstances, directly proportional to the hydraulic retention time (HRT) of the sewer. To reduce the corrosion and control the odor in concrete sewers, it is necessary to model the production of sulfide in the concrete sewers with different HRTs. However, previous researches were mostly carried out in simulated Perspex-made sewers, and the obtained theoretical formulas based on the Monod equation were impractical because of the complexity. An actual concrete pipe with domestic sewage was employed in this study to obtain a simple but practical model, which can be applied to quantitively describe the sulfide production according to the HRT of the sewer and the chemical oxygen demand (COD) of the sewage. The empirical equation obtained was r = (0.045 × lnHRT + 0.071) × ([COD] - b), the coefficient is a logarithmic function of the HRT, and the sulfide production rate and COD have a power relationship. Based on the data of COD and HRT obtained in the realistic sewer, the production of sulfide in the sewer can be predicted for better maintaining sewers through sulfide control.
混凝土污水管道的腐蚀和异味主要与硫化物的产生有关，而硫化物的产生在某些情况下与污水管道的水力停留时间（HRT）成正比。为了减少腐蚀并控制混凝土污水管道中的异味，有必要针对不同 HRT 下的混凝土污水管道中的硫化物生成情况进行建模。然而，之前的研究大多是在模拟的有机玻璃制污水管道中进行的，并且基于 Monod 方程得出的理论公式由于过于复杂而不切实际。本研究采用实际的混凝土污水管，以获得一个简单但实用的模型，可以根据污水管道的 HRT 和污水的化学需氧量（COD）来定量描述硫化物的生成情况。得到的经验方程为 r = (0.045 × lnHRT + 0.071) × ([COD] - b)，其中系数是 HRT 的对数函数，硫化物生成速率与 COD 呈幂函数关系。基于实际污水管中获得的 COD 和 HRT 数据，可以预测污水管中的硫化物生成情况，从而通过硫化物控制更好地维护污水管。
