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Article

Removing Nutrients from Crab-Breeding Wastewater by a Floating Plant–Effective Microorganism Bed

by 1,2, 3,*, 4 and 1
1
College of Agricultural Engineering, Hohai University, Nanjing 210098, China
2
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
3
Jiangsu Provincial Key Laboratory of Environmental Engineering, Jiangsu Provincial Academy of Environmental Sciences, Nanjing 210036, China
4
Jiangsu Engineering Consulting Center, Nanjing 210000, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3384; https://doi.org/10.3390/w12123384
Received: 30 September 2020 / Revised: 7 November 2020 / Accepted: 26 November 2020 / Published: 2 December 2020
(This article belongs to the Section Water, Agriculture and Aquaculture)
Effective microorganism treatment, a low-cost and remediation measure that with no secondary pollution, was conducted in aquaculture wastewater. Unfortunately, effective microorganism erosion caused by the momentum of water flow under in situ conditions limits the treatment effect. In the channel test, a floating plant bed coupled with the effective microorganism was used to treat crab-breeding wastewater. This study explored the effect of plant coverage and hydraulic loading on aquaculture wastewater purification in the floating plant bed–effective microorganism coupled system. The results show that the effect of the coupled treatment effect is much better than pure microorganism treatment. The pollutant degradation coefficient has a significantly positive correlation with the length of the floating plant bed. A plant coverage rate of 30% and effluent hydraulic loading of 1.0 m3/m2·day are optimum floating plant bed–effective microorganism test conditions. Once the coverage rate exceeded 30%, the increase in the CODMn removal efficiency was not clear. At the same time, the high plant coverage inhibited the oxygen capacity in the water body, which directly led to a decrease in the degradation ability of organic matter by the plant. The biology–ecology coupled technology proposed in this study overcame the shortcomings of the easy-to-lose effective microorganism during the traditional unfixed process and improved the stability of the processing system. It strengthened the crab-breeding wastewater remediation effect. For an in situ application, the artificial restoration system 1 km in length was efficient, and the discharge met the standard at the end of the river. View Full-Text
Keywords: aquaculture wastewater; floating plant bed–effective microorganism united; nitrogen and phosphorus removal; immobilized microorganism aquaculture wastewater; floating plant bed–effective microorganism united; nitrogen and phosphorus removal; immobilized microorganism
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MDPI and ACS Style

Chen, L.; Ling, H.; Tan, J.; Shao, X. Removing Nutrients from Crab-Breeding Wastewater by a Floating Plant–Effective Microorganism Bed. Water 2020, 12, 3384. https://doi.org/10.3390/w12123384

AMA Style

Chen L, Ling H, Tan J, Shao X. Removing Nutrients from Crab-Breeding Wastewater by a Floating Plant–Effective Microorganism Bed. Water. 2020; 12(12):3384. https://doi.org/10.3390/w12123384

Chicago/Turabian Style

Chen, Lina, Hong Ling, Junyi Tan, and Xiaohou Shao. 2020. "Removing Nutrients from Crab-Breeding Wastewater by a Floating Plant–Effective Microorganism Bed" Water 12, no. 12: 3384. https://doi.org/10.3390/w12123384

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