含盐食品工业废水脱氮除磷性能研究

钮劲涛; 邓伟玲; 杜静雨; 古家宇; 周贤明; 陈鑫; 吉建涛; 金宝丹

doi:10.12187/2024.01.015

February 2024

Article Contents

NIU Jintao, DENG Weiling, DU Jingyu, et al. Denitrification and phosphorus removal performance of salt-containing food industry wastewater[J]. Journal of Light Industry, 2024, 39(1): 118-126. doi: 10.12187/2024.01.015

Citation: NIU Jintao, DENG Weiling, DU Jingyu, et al. Denitrification and phosphorus removal performance of salt-containing food industry wastewater[J]. Journal of Light Industry, 2024, 39(1): 118-126. doi: 10.12187/2024.01.015 shu

Denitrification and phosphorus removal performance of salt-containing food industry wastewater

1. Henan Heng'an Environmental Protection Technology Co., Ltd., Zhengzhou 450001, China;
2. College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
3. School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China

Received Date: 2023-06-18
Accepted Date: 2023-09-07

Abstract

In order to study the nitrogen and phosphorus removal performance of salt-containing food industry wastewater, the different doses of salinity were introduced into the food industry wastewater treatment system and the mode of operation was selected as anaerobic/anoxic/aerobic (A/A/O). The variation of different indicators including chemical oxygen demand (COD), NH₄⁺-N, NO₂^--N, NO₃^--N, PO₄^3--P were analyzed, and the influence mechanism about different concentrations of salinity on the nitrogen and phosphorus removal performance for the food industry wastewater was revealed combining with sludge properties and functional microorganisms. The results showed that the introduced salinity not only improved the COD degradation with the value increasing from 84.08% to 90.33% , but also improved phosphorus release of phosphorus removing bacteria and nitrification. The efficiency of NH₄⁺-N increased from 95.79% to 98.85% . However, it restrained the absorption phosphorus of phosphorus removing bacteria in aerobic phase. The denitrification performance was enhanced under low salinity (0.5 g/L) condition, but was decreased when the salinity increased to 3.0 g/L. The extracellular polymeric substance (EPS) increased with salinity and the EPS was 38.81 mg/g volatile suspended solid (VSS) under the 3.0 g/L salinity condition. The introduced salinity increased the relative abundance of microbial community and changed its structure, which enhanced denitrifying bacteria enrichment including Chloroflexi、Actinobacteriota and Planctomycetota. It was also found that salinity increased the abundance of Caldilineaceae、Ferruginibacter and Kouleothrix but restrained the abundance of CandidatusCompetibacter. All of them guaranteed the stable nitrogen and phosphorus removal of treatment system.
- salinity,
- food industry wastewater,
- denitrification and phosphorus removal,
- extracellular polymeric substance,
- function microbial
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Denitrification and phosphorus removal performance of salt-containing food industry wastewater

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