Research on Biological Fluidized Bed System Treatment Performance and Nitrogen Removal Process for Seafood Processing Wastewater with Different Operation Conditions

Yi Ding,Zhansheng Guo,Xuguang Hou,Zhenlin Liang,Zhipeng Li,Hong You,Junxue Mei,Wei Sun

doi:10.3390/w13192630

Yi Ding, Zhansheng Guo + Show 6 more

Open Access

https://doi.org/10.3390/w13192630

Copy DOI

Abstract

In this study, the biological fluidized bed system was used to treat seafood processing wastewater. The sludge was collected from the secondary sedimentation tank of a municipal wastewater treatment plant and acclimated for 200 days before the experiment. The treatment efficiencies of simulated seafood processing wastewater by biological fluidized bed system with different sludge concentrations, different hydraulic retention times (HRTs) and different bio-carriers were studied. The results showed that the removal efficiency of nitrogen and phosphorus increased with the increasing sludge concentration and by extending hydraulic retention time, and the higher removal efficiency of nitrogen and phosphorus could be obtained with the higher specific surface area of the bio-carrier. The nitrogen removal process analysis showed that the nitrification and denitrification activity of sludge could be changed with different operation conditions resulting in different nitrogen removal efficiency in the biological fluidized bed system. This was mainly because the change tendency of the ammonia nitrogen oxidizing process, nitrite oxidizing process, nitrite reduction process and nitrate reduction process was different with different operation conditions in a high salinity environment. Theoretically, the difference of the inhibitory effect of a high-salt environment on different nitrification and denitrification processes could be used to realize shortcut nitrification denitrification by controlling a certain operation condition.

Highlights

Introduction published maps and institutional affilCompared with general industrial wastewater treatment, there are some differences in the composition and properties of pollutants in seafood processing wastewater: High-salt wastewater is produced by processing dried, preserved and fermented seafood, accompanied by deep watercolor and high concentration of organic matter
The wetland system is usually applied as the tertiary treatment due to the high solids content and organic matter concentration of the raw wastewater, and the highest treatment performances were found at five days hydraulic retention time (HRT) with iations
Activated sludge and jute fiber in the sequencing batch reactor (JF-SBR) was used for the seafood processing wastewater treatment in one study, and the results revealed that the JF-SBR has higher efficiency compared to the conventional SBR [11]

Summary

Introduction

Compared with general industrial wastewater treatment, there are some differences in the composition and properties of pollutants in seafood processing wastewater: High-salt wastewater is produced by processing dried, preserved and fermented seafood, accompanied by deep watercolor and high concentration of organic matter. The addition of phosphate and nitrogen to fresh seafood promotes higher phosphate and nitrogen content in the wastewater [1,2,3]. The treatment of saline seafood processing wastewater has drawn great attention for researchers. Several biological treatment processes have been applied to treat seafood processing wastewater. The wetland system is usually applied as the tertiary treatment due to the high solids content and organic matter concentration of the raw wastewater, and the highest treatment performances were found at five days hydraulic retention time (HRT) with iations

Methods

Results

Conclusion