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Improvements in water quality of aquaculture effluent after treatment by sedimentation, oyster filtration and macroalgal absorption

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oysters can filter particulates (eg. phytoplankton, bacteria, small inorganic clay particles) ... oyster filtration. macroalgal absorption ... – PowerPoint PPT presentation

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Title: Improvements in water quality of aquaculture effluent after treatment by sedimentation, oyster filtration and macroalgal absorption


1
Improvements in water quality of aquaculture
effluent after treatment by sedimentation, oyster
filtration and macroalgal absorption
Adrian Jones1, William Dennison1 Nigel
Preston2 1 Botany Department, The University of
Queensland, Brisbane, QLD, Australia 2 CSIRO
Marine Research, Cleveland, QLD, Australia
2
Shrimp Farm Plume
  • Suspended Solids
  • Phytoplankton
  • Bacteria
  • Nutrients

Plume
3
Introduction
  • Marine organisms (plants and animals) can act as
    biological filters
  • natural, already existing ecosystems (eg.
    mangroves, seagrasses)
  • introduced organisms for the purpose of improving
    effluent water quality
  • oysters can filter particulates (eg.
    phytoplankton, bacteria, small inorganic clay
    particles)
  • macroalgae can assimilate dissolved organic and
    inorganic nutrients

4
Aims
  • Test a three stage integrated system for the
    treatment of aquaculture effluent using
  • sedimentation
  • oyster filtration
  • macroalgal absorption
  • Estimate potential removal rates of bacteria,
    suspended solids, nutrients and phytoplankton

5
Experimental Design
Laboratory treatment tanks
6
Sampling Protocol
  • Three replicate one litre water sampes collected
    from the control and three replicate treatment
    tanks

Control
Oysters
  • Water column nutrients (dissolved nh4, no3, po4
    and total N P)
  • Total suspended solids
  • Chlorophyll a
  • pH, dissoved oxygen, temp, salinity
  • bacterial numbers
  • organic
  • sedimentation rates

1 L samples analysed for
Control
Macroalgae
7
Experimental Timeline
Oysters (10 L) (tanks aerated)
Macroalgae (5 L) (tanks aerated)
Sedimentation (60 L) (tank not aerated)
Raw Effluent
Control
Control
(16 oyster
(no algae)
shells)
100g
16 Oysters
Macroalgae
100g
16 Oysters
Macroalgae
100g
16 Oysters
Macroalgae
24
48
0
72
Time (h)
8
Suspended Solids
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
9
Settlement Rates
Sedimentation
Oyster Filtration
Macroalgal Absorption
Oyster control
Oyster treatment
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
10
Suspended Solids ( Organic)
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
11
Settled Particulates ( Organic)
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
12
Chlorophyll a
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
13
Bacteria
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
14
Ammonium
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
15
Nitrate / Nitrite
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
16
Phosphate
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
17
Total Nitrogen
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
18
Total Phosphorus
Sedimentation
Oyster Filtration
Macroalgal Absorption
Sedimentation Control (no oysters or
macroalgae)
Oyster Filtration
Macroalgal Absorption
19
Water Quality Improvements
20
Water Quality Improvements
Pond Effluent
Settled Effluent
Biofiltered Effluent
21
Conclusions
  • Combined treatment effectively reduced the
    concentrations of
  • suspended solids (especially the small
    unsettleable inorganic particles)
  • water column nutrients (particulate and
    dissolved)
  • phytoplankton
  • bacteria
  • Sedimentation removed proportionally more
    inorganic than organic particles which is
    beneficial to the oysters filtration efficiency
    and health
  • Oyster filtration significantly decreased the
    concentrations of total N and total P, but
    increased the dissolved nutrients through
    excretion
  • Macroalgal absorption effectively removed
    dissolved nutrients
  • Total removal efficiency for combined treatment
    can be calculated as 4 kg N ha-1 d-1 and 0.6 kg P
    ha-1 d-1
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