Abstract
Sulfide production has been one of the most important problems in sewage collection systems that came to be known as an important factor of corrosion in concrete sewerage systems since early 1900. The emission of hydrogen sulfide gas in sewerage conduits creates problems including biological corrosion of concrete, release of repulsive odors in the city environment, as well as the potential danger that the toxic sulfide gas poses for the workers. Several factors such as high sulfate density, the organic material, temperature, waste water retention period, pH, Oxidation reduction potential (ORP), flow rate and surface area can increase the probable emission of sulfide. Due to the adverse effects of this chemical material, in recent years broader studies have been conducted on the control of sulfide production in sewage collection networks, including the injection of air, nitrate, H2O2, and iron salt. The purpose of these studies was to find suitable solutions for controlling the emission of hydrogen sulfide taking into account the construction conditions and economic profitability. This article is a review of all the research done on controlling the production of sulfate in sewage collection systems. It also reviews the advantages and disadvantages of the methods used in these studies which have examined the effectiveness of using formaldehyde, MgO2/CaO2, MFCs, nitrates, microbe-eliminators. The results of this study show that using the aforementioned chemical and biological materials for controlling the challenges of hydrogen sulfide production in sewerage, besides being economical and effective, are able to protect sewerage from corrosion and we can also arrive at a healthy and odorless environment.
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