Performance of treating aquaculture effluent using PHBV/volcanic rock/pyrite synergistic
Journal Title: Energy Environmental Protection - Year 2024, Vol 38, Issue 1
Abstract
In order to address the low nitrogen and phosphorus removal efficiencies caused by a low carbon-to-nitrogen ratio in aquaculture effluents, a biofiltration device based on the synergistic coupling of 3-hydroxybutyrate and 3-hydroxyvalerate copolymers (PHBV) with volcanic rock and pyrite was developed and evaluated for its efficacy in treating aquaculture effluents. Two groups of filter devices with different filler contents were designed. In column 1, the device was filled with 15 cm of pyrite, 15 cm of mixed filter media, and 5 cm of volcanic rock from top to bottom. In column 2, the device was filled with 10 cm of pyrite, 15 cm of mixed filter media, and 10 cm of volcanic rock. The effects of different filler mass ratios on the efficiencies of denitrification and phosphorus removal were analyzed. The results showed that the average removal rate of nitrate nitrogen reached 97.8% in column 2, significantly higher than that in column 1 (p<0.05). However, the average removal rate of phosphate was lower than that in column 2, with an average removal rate of only 35.0%. Increasing the mass ratio of volcanic rock improved the removal of nitrate, while increasing the mass ratio of pyrite improved the removal of phosphate. Simultaneous removal of nitrogen and phosphorus was achieved when the dissolved oxygen concentration ranged from 1.2 to 1.5 mg/L. In conclusion, the process of synergistic enhancement of PHBV with volcanic rock and pyrite can achieve the simultaneous removal of nitrogen, phosphorus and other nutrients in aquaculture effluent, providing a new idea and a new method for solving the problem of deep purification of aquaculture effluent.
Authors and Affiliations
ZHANG Haigeng|Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, China, WANG Fangying|School of Navigation and Marine Engineering, Dalian Ocean University, China, CAO Xinyuan|College of Marine and Biological Engineering, Yancheng Institute of Technology, China, SUN Yating|College of Marine and Biological Engineering, Yancheng Institute of Technology, China, XU Zhongshuo|School of Environmental Science and Engineering, Donghua University, China, ZHANG Yulei*|Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, China
Keywords
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- EP ID EP736934
- DOI 10.20078/j.eep.20240122
- Views 63
- Downloads 0
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