H2S Concentration Ranking Around Sewerage Manholes Using Lead Acetate Detector
Subject Areas : Environmental pollution
1 - استادیار، واحد استهبان، دانشگاه آزاد اسلامی، استهبان، ایران
Keywords: H2S, Odor, Sewer, Manhole.,
Abstract :
Introduction: H2S production in sewage collection networks creates many problems, including corrosion of concrete pipes, effects on human health and unpleasant smells. ). Although the sewerage is designed in such a way that the air flows and the H2S gas production does not occur due to the anaerobic process, but sometimes due to improper design, increase in flow rate, pipe clogging or fracture, the H2S gas disperses around the manholes. Monitoring the sewage network by determining the amount of H2S gas can help network repair in a timely manner. Due to the high cost of advanced monitor systems. The continuous management of sewage networks in developing countries requires the development of cheap and economical methods. Materials and Methods: In this research, 150 manholes were selected in Ahwaz city in Iran. Paper tapes impregnated with lead acetate were prepared. They were placed in different areas around and inside the manholes. After collecting samples, they were classified into seven grades according to the amount of obscuration created in the indicators. At the same points as the samples were taken, the amount of H2S gas was measured by the gas meter. And gas concentration limits were determined for each. Results and Discussion: The results showed that lead acetate paper indicator detected a concentration of H2S from zero to 35ppm. The best positioning of the indicators was within the manholes, and the best contact time was set at 24 hours. Conclusion: It is appropriate to use the results of the ranking of indicators in a situation where it is not possible to use advanced sensors to monitor sewage networks.
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