LI Ya-qin,YANG Jing,ZHANG Zhi-qiang,et al.Control of Harmful Gas in Sewage Pipeline through Creating Light Environment[J].China Water & Wastewater,2021,37(11 11):28-35.
Control of Harmful Gas in Sewage Pipeline through Creating Light Environment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
28-35
Column:
Date of publication:
2021-06-01
- Keywords:
- sewage pipeline; illumination; hydrogen sulfide; sulfate reducing bacteria; bacterial-algal aggregate
- Abstract:
- Prevention of pipeline corrosion and safety accident is an important direction to improve the quality and efficiency of drainage system, and harmful gases such as hydrogen sulfide (H2S) and carbon monoxide (CO) produced in pipelines with poor ventilation and dark environment are the main causes of accidents. Aiming at the problem of harmful gases generation in sewage pipelines, a new method to control harmful gas generation by creating similar open sewer transport environment in sewage pipelines was proposed, and an experimental model of simulated sewage pipelines was established to investigate the effect of light on harmful gas control and sewage quality. Compared with sewage pipelines in dark environment, concentrations of H2S, sulfide and CO were reduced by 47.2%, 36.7% and 59.8% by illumination, indicating that the generation of harmful gas was effectively inhibited in the pipelines. Meanwhile, concentrations of COD and TN decreased by 12.0% and 5.0%, respectively, and the carbon to nitrogen ratio of sewage did not change significantly. Biofilm microscopy indicated that illumination altered the microbial community and promoted the growth of algae to form bacterial-algal aggregates in the pipelines. Algae growth would release oxygen, change the anaerobic environment and inhibit aerogenic anaerobes in the pipelines, which was the main mechanism of controlling harmful gas generation by illumination. The light environment can provide technical choice for controlling harmful gas in sewage pipelines and new ideas for urban drainage system planning and construction.
Last Update:
2021-06-01