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http://dx.doi.org/10.22156/CS4SMB.2020.10.07.153

Characteristics of Sewage Flow in Sewer Pipes Deposited with Cohesive and Non-cohesive Solids  

Lee, Taehoon (Dept. of Civil and Environmental Engineering, Dankook University)
Kang, Byongjun (Environment Solution Partners Inc.)
Park, Kyoohong (Dept. of Civil and Environmental Engineering at Chung-Ang University)
Publication Information
Journal of Convergence for Information Technology / v.10, no.7, 2020 , pp. 153-159 More about this Journal
Abstract
In order to find out the condition of flow in sewer pipes, this study investigated the characteristics of tractive force of sewage flow estimated using actual measured values of water level, velocity, and flowrate in sewers located at uppermost portion in a treatment area during dry weather periods. When the scene of sewage flow was taken by CCTV after cohesive and non-cohesive solids (tofu and sand) were put on the sewer invert, it was found that the solids could be flushed without significant interruption. In sewer with slope of 0.00319, the frequency exceeding the minimum tractive force of sewage during a weekday was zero, while it was 10 per day with slope of 0.00603. During the week of the field observation, the event to exceed the minimum tractive force occurred once, suggesting that sewer odor would potentially increase. Maximum tractive force in sewer with steep slope was 2.9-3.1 N/㎡, but with gentle slope it decreased to 1.6-1.7N/㎡. It was also observed that the interval of time maintained below the criterion of minimum tractive force increased, during weekends compared to weekdays and for the sewage including non-cohesive particles which could enter combined sewers during a storm period. This study found that the sewer sediments formed by direct feces input into sewers, through sewer pipes which were designed meeting the standard sewer design criteria, could be flushed without staying as deposited solids state for a long time.
Keywords
Sewers; Minimum velocity; Tractive force; Sediments; Odor;
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