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| Sedimentation Characteristics of Suspended Solids in Aquaculture Wastewater of Nile Tilapia Pond |
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| DOI：10.16768/j.issn.1004-874X.2024.08.013 |
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| Abstract: |
| 【Objective】The deposition and decomposition of solid particles in aquaculture wastewater will lead to the
deterioration of aquaculture water and affect the health of fish. The study was conducted to understand the sedimentation rule of
solid particles in aquaculture wastewater of Nile tilapia (Oreochromis niloticus) and its influence on the aquaculture water body,
with an aim to provide a theoretical basis for the research and development and design of aquaculture wastewater treatment
system.【Method】 The aquaculture wastewater of Nile tilapia pond was treated by static sedimentation. Samples of aquaculture
wastewater at different depths were collected at different sedimentation times, and the particle size distribution, soluble organic
components and water quality indexes of aquaculture wastewater were analyzed.【Result】Static sedimentation had no
significant effect on the quality of aquaculture wastewater (P>0.05), and only reduced the mass concentrations of total nitrogen
(TN), total phosphorus (TP) and chemical oxygen demand (COD) in aquaculture wastewater surface. Suspended solids and
algae in aquaculture wastewater could be separated by static sedimentation (P<0.05). After static sedimentation for 5.0 h, the
TSS, chlorophyll a mass concentration, turbidity and chromaticity of two-meter-high water decreased by 3 854 mg/L, 42 mg/L,
0.23 NTU and 309 degrees respectively, and the TSS and chlorophyll a mass concentrations in aquaculture water decreased
with the extension of sedimentation time. The results of particle size distribution showed that the settleable particles larger than
100 μm could be effectively separated by static sedimentation, but the fine particles lower than 30 μm could not be separated.
The sedimentation velocity of solid particles was related to its particle size distribution range and mass concentration. The
sedimentation velocity of solid particles decreased with the decrease of particle size distribution range and the increase of
mass concentration. The results of three-dimensional fluorescence spectrum showed that the soluble organic compounds in
the wastewater of Nile tilapia were mainly fulvic acid-like, and the soluble organic components in the wastewater could not be
completely changed by static sedimentation.【Conclusion】Short time static sedimentation can effectively remove settleable
particles in aquaculture wastewater, and the mass concentrations of TSS and chlorophyll a decrease with the extension of
sedimentation time. However, static sedimentation cannot completely change the soluble organic components in the wastewater,
nor can it significantly reduce the mass concentrations of nitrogen, phosphorus and other pollutants in aquaculture wastewater. |
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