Effect of Temperature on Nitrogen Removal Performance and the Extracellular Polymeric Substance (EPS) in a Sequencing Batch Reactor (SBR)

• Published in: Huanjing kexue Vol. 38; no. 11; p. 4648
• Main Authors: Sun, Hong-Wei, Chen, Cui-Zhong, Wu, Chang-Feng, Zhao, Hua-Nan, Yu, Xue, Fang, Xiao-Hang
• Format: Journal Article
• Language: Chinese
• Published: China 08.11.2017
• Subjects: Bioreactors; Denitrification; Extracellular Polymeric Substance Matrix - chemistry; Nitrification; Nitrogen - isolation & purification; Sewage; Temperature; Water Purification; temperature; biological denitrification; extracellular polymeric substance; nitrite accumulation rate
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.201704270

In this paper, the long-term effects of temperature on the nitrogen removal performance and the extracellular polymeric substance (EPS) in a sequencing batch reactor (SBR) treating synthetic wastewater was investigated under three temperature conditions (15℃, 25℃, 35℃). The results showed that high temperatures (35℃) could promote the establishment of short-cut nitrification processes and improve nitrogen removal performance greatly. Temperature had a significant impact on the EPS and its composition. With an increased temperature, the EPS and tightly bound EPS (TB-EPS) content decreased, while, loosely bound EPS (LB-EPS) increased slowly. TB-EPS became dominant in the EPS (the percentage of TB-EPS/EPS was 69.0%-79.5%), however, the ratio of TB-EPS/LB-EPS decreased from 3.8 (15℃) to 3.6 (25℃), and then to 2.2 (35℃) with a gradual increase in temperature. Moreover, protein (PN) and DNA in the EPS, TB-EPS, and LB-EPS decreased with an increasing temperature. Carbohydrates (PS) in the EPS and LB-EPS increased as