Abstract
With the continuous increase of urban domestic sewage and production sewage discharge, China has enhanced the treatment of odors in the sewage treatment process. At present, the odor problem of sewage treatment plants needs to be treated jointly by various techniques. In this paper, biological and oxidation methods are selected to study the odor treatment methods of sewage treatment plants, and two pilot plants of biological method and oxidation method are established for the pilot tests. The test results showed that: using biological method to treat the odors in the sewage tanks has a good treatment effect, and the treatment effect of N2 and H2S is relatively stable; using the "alkali absorption + oxidation" method to treat the odors produced by the other regulating tanks has a relative stable treatment effect. The H2S treatment efficiency is best when the pH is 7.5-9, the potential is 700-850, and the liquid-gas ratio is between 4.7L/m3-6.0L/m3.
As China's economic development constantly speeds up and the industrialization process continues to deepen, the discharge of urban domestic sewage and production sewage continues to increase. The discharge of urban sewage has a great impact on the lives of the general public and industrial production. In the city, odor is usually generated during the sewage treatment process, and whether the odor is harmful or not, it is unbearable for the people. How to control the odors and conduct effective treatment has become a key issue in urban environmental protection (Antonopoulou et al., 2014). At present, China has enhanced the treatment of odors in the sewage treatment process, but single treatment technology has been unable to effectively deal with the odor problem of sewage treatment plants. The combination of various technologies has become an important development direction of future odor treatment (Ghoreishi and Haghighi, 2003; Sed et al., 2018).
At present, many scholars at home and abroad have conducted targeted research on the treatment of odors and formed a series of research results. Some scholars have proposed to use chemical washing method, biological filtration method and other methods to deal with the odors (Cowger and Labbe, 1965; Esplugas et al., 2004). Some scholars have conducted detailed research on the equipment and process of odor treatment (Ioannou-Ttofa et al., 2017); and some scholars have studied the feasibility of odor treatment in some projects (Beltrán et al., 2001; Moreira et al., 2015). This paper is mainly based on the biological oxidation method to study the odor treatment method of sewage treatment plant, which is of great practical value (Mazzelli et al., 2018).
