The Optimal Planting Coverage Rate and Wastewater Concentration for Water Spinach Floating Bed on Geese Wastewater Purification
Chao Wang 1,2
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Chongqing Academy of Animal Sciences, Chongqing 402460, China
Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest, Ministry of Agriculture, Chongqing 402460, China
Submission date: 2021-03-23
Final revision date: 2021-06-22
Acceptance date: 2021-07-16
Online publication date: 2021-12-31
Publication date: 2022-01-28
Pol. J. Environ. Stud. 2022;31(1):691–700
The goal of this study was to explore the optimal planting coverage rate and wastewater concentration required by water spinach floating bed system for the purification of geese farm wastewater. The results showed that the floating bed with water spinach in high concentration wastewater had better removal rates on ammonia nitrogen (NH4+-N), total nitrogen (TN) and total phosphorus (TP) (P<0.05). There was no significant difference on the removal of nutrients except turbidity (NTU) among the different plant coverage rages (P>0.05). The floating bed system with water spinach removed heavy metals (Hg, As and Zn) in different concentration wastewater, with removal rates of 22.21%~68.20%, 40.00%~52.94% and 100.00%. Water spinach in low concentration wastewater had significant higher root length, stem height and weight gain (P<0.05) than medium and high concentration wastewater. The TN and TP contents of water spinach stem leaf in high concentration wastewater were significantly higher than other groups(P<0.05). The concentration of heavy metals (Pb, Cd, As and Hg) in water spinach in all groups was far below the national food safety standard. In general, the water spinach floating bed is suitable for the