Integrated treatment of shrimp effluent by sedimentation, oyster filtration and macroalgal absorption: a laboratory scale study

Jones, A. B., Dennison, W. C. and Preston, N. P. (2001) Integrated treatment of shrimp effluent by sedimentation, oyster filtration and macroalgal absorption: a laboratory scale study. Aquaculture, 193 1-2: 155-178. doi:10.1016/S0044-8486(00)00486-5


Author Jones, A. B.
Dennison, W. C.
Preston, N. P.
Title Integrated treatment of shrimp effluent by sedimentation, oyster filtration and macroalgal absorption: a laboratory scale study
Journal name Aquaculture   Check publisher's open access policy
ISSN 0044-8486
Publication date 2001-02-01
Sub-type Article (original research)
DOI 10.1016/S0044-8486(00)00486-5
Volume 193
Issue 1-2
Start page 155
End page 178
Total pages 24
Editor R. P. Wilson
B. A. Costa-Pierce
Place of publication Amsterdam
Publisher Elsevier Science BV
Collection year 2001
Language eng
Subject C1
270400 Botany
770406 Integrated (ecosystem) assessment and management
0699 Other Biological Sciences
0704 Fisheries Sciences
Abstract Effluent water from shrimp ponds typically contains elevated concentrations of dissolved nutrients and suspended particulates compared to influent water. Attempts to improve effluent water quality using filter feeding bivalves and macroalgae to reduce nutrients have previously been hampered by the high concentration of clay particles typically found in untreated pond effluent. These particles inhibit feeding in bivalves and reduce photosynthesis in macroalgae by increasing effluent turbidity. In a small-scale laboratory study, the effectiveness of a three-stage effluent treatment system was investigated. In the first stage, reduction in particle concentration occurred through natural sedimentation. In the second stage, filtration by the Sydney rock oyster, Saccostrea commercialis (Iredale and Roughley), further reduced the concentration of suspended particulates, including inorganic particles, phytoplankton, bacteria, and their associated nutrients. In the final stage, the macroalga, Gracilaria edulis (Gmelin) Silva, absorbed dissolved nutrients. Pond effluent was collected from a commercial shrimp farm, taken to an indoor culture facility and was left to settle for 24 h. Subsamples of water were then transferred into laboratory tanks stocked with oysters and maintained for 24 h, and then transferred to tanks containing macroalgae for another 24 h. Total suspended solid (TSS), chlorophyll a, total nitrogen (N), total phosphorus (P), NH4+, NO3-, and PO43-, and bacterial numbers were compared before and after each treatment at: 0 h (initial); 24 h (after sedimentation); 48 h (after oyster filtration); 72 h (after macroalgal absorption). The combined effect of the sequential treatments resulted in significant reductions in the concentrations of all parameters measured. High rates of nutrient regeneration were observed in the control tanks, which did not contain oysters or macroalgae. Conversely, significant reductions in nutrients and suspended particulates after sedimentation and biological treatment were observed. Overall, improvements in water quality (final percentage of the initial concentration) were as follows: TSS (12%); total N (28%); total P (14%); NH4+ (76%); NO3- (30%); PO43-(35%); bacteria (30%); and chlorophyll a (0.7%). Despite the probability of considerable differences in sedimentation, filtration and nutrient uptake rates when scaled to farm size, these results demonstrate that integrated treatment has the potential to significantly improve water quality of shrimp farm effluent. (C) 2001 Elsevier Science B.V. All rights reserved.
Keyword Fisheries
Marine & Freshwater Biology
Biofiltration
Macroalgae
Oysters
Polyculture
Sedimentation
Shrimp Effluent
Clam Mercenaria-mercenaria
Gracilaria-tikvahiae
Crassostrea-virginica
Cladophora-vagabunda
Nitrogen-source
Ammonium Uptake
Mytilus-edulis
Nitrate Uptake
Carbon
Biodeposition
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Marine Studies Publications
 
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Created: Wed, 15 Aug 2007, 02:31:16 EST