|Title:||Effect of salinity on anammox process treating low-strength wastewater|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Sewage -- Purification -- Nitrogen removal
|Department:||Faculty of Construction and Environment|
|Pages:||iv, 42 pages : color illustrations|
|Abstract:||Nowadays, nitrogen pollution is an environmental problem that has attracted attention. With the continual development of industry, high salinity wastewater is discharged in producing of food, chemical, pharmaceutical, and other fields, especially in Hong Kong. Similarly, to utilize seawater flushing produces much salinity wastewater. However, to treat this wastewater is a difficult challenge around the world. In this study, a stirred tank reactor (CSTR) was used to treat synthesis wastewater contaminated different ratio of salinity concentration. The objective of this study is to explore the nitrogen removal performance through anammox treating low strength wastewater under different salinity ratio (0.7% and 1.4%) and to explore the relationship between microbial dynamics and different salinity ratios. The results showed that Anammox bacteria Candidatus_Brocadia had always been the dominant species in the reactor, even in high salinity environments (1.4%). The abundance of anammox bacteria decreased with the salinity rising, and then slowly recovered. The total nitrogen removal efficiency reaches about 75% when salinity was 0.7%, however, it dropped to 50 % when the salinity increased to 1.4%. Overall, nitrogen removal efficiency over 50% was obtained even the salinity reached to 1.4%. Also, nitrite oxide bacteria (NOB) appeared with increasing salinity and became one of the dominant species, signaling the salinity had potential promotion on the NOB.|
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