Evaluation of submerged surface flow (SSF) constructed wetlands for recirculating tilapia production systems

Zachritz, W.H.; Hanson, Adrian; Sauceda, J. A.; Fitzsimmons, K.

doi:10.1016/j.aquaeng.2008.05.001

Cited by 35 publications

(30 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Cripps and Bergheim, 2000;Lin et al, 2002; Schultz et al,. 2003;Lymbery et al, 2006;Sindilariu et al, 2007Sindilariu et al, , 2009Zachritz et al, 2008;Webb et al, 2012), and they compare favourably with mechanical filters that typically remove 10 -43% of total nitrogen and 49 -63% of total phosphorus (Mäkinen et al, 1988;Lekang et al, 2000).The results from our study indicated that plants were a necessary component of wetland ecosystems for the removal of nitrogen and phosphorus. The role of plants in constructed wetlands is not fully understood.…”

supporting

confidence: 54%

Section: The Role Of Constructed Wetlands In Treatment Of Effluent Frmentioning

confidence: 99%

“…see Jackson et al, 2003;Webb et al, 2012) and Webb et al (2012) found that halophyte wetlands had different removal efficiencies 12 for dissolved inorganic nitrogen and dissolved organic nitrogen. In addition, nutrient removal efficiencies in constructed wetlands are principally influenced by nutrient inflow concentration, hydraulic load (which is inversely related to hydraulic residence time) and the accumulation of solids, which lead to wetland clogging (Rousseau et al, 2008;Zachritz et al, 2008;Sindilariu et al, 2009). Design criteria to optimise hydraulic residence time and minimise clogging will require long-term studies in more realistic on-farm or pilot-scale wetlands irrigated with aquaculture effluent.…”

Section: The Role Of Constructed Wetlands In Treatment Of Effluent Frmentioning

confidence: 99%

“…Sub-surface flow wetlands offer a potentially simple and low cost technology for the treatment of nutrient-rich aquaculture effluent, because they exploit the ecological interactions between the components of wetland ecosystems (plants, sediments, and microbial flora and fauna) to trap and store nutrients from wastewater (Lin et al, 2002; Schultz et al, 2003;Lymbery et al, 2006;Vymazal, 2007;Zachritz et al, 2008). Applying a wetland treatment system to effluent from inland saline aquaculture in Australia, however, poses some unique problems.…”

Section: Introductionmentioning

confidence: 99%

“…Production methods vary from static pond to flow-through systems, with regular feeding of commercial trout pellets Lever et al, 2004). Uneaten food and fish excretion produce nutrient-enriched effluent and the off-farm disposal of this effluent into natural waterways or back to the water table is regarded by resource managers as the most important environmental impact from inland saline aquaculture in Western Australia (Starcevich et al, 2003).Sub-surface flow wetlands offer a potentially simple and low cost technology for the treatment of nutrient-rich aquaculture effluent, because they exploit the ecological interactions between the components of wetland ecosystems (plants, sediments, and microbial flora and fauna) to trap and store nutrients from wastewater (Lin et al, 2002; Schultz et al, 2003;Lymbery et al, 2006;Vymazal, 2007;Zachritz et al, 2008). Applying a wetland treatment system to effluent from inland saline aquaculture in Australia, however, poses some unique problems.…”

mentioning

confidence: 99%

See 4 more Smart Citations

The potential of a salt-tolerant plant (Distichlis spicata cv. NyPa Forage) to treat effluent from inland saline aquaculture and provide livestock feed on salt-affected farmland

Lymbery

Kay

Doupé

et al. 2013

Science of The Total Environment

View full text Add to dashboard Cite

Dryland salinity is a major problem affecting food production from agricultural land in Australia and throughout the world. Although there is much interest in using saline groundwater to grow marine fish on salt-affected farmland, the disposal of nutrient enriched, saline aquaculture effluent is a major environmental problem. We investigated the potential of the salt-tolerant NyPa Forage plant (Distichlis spicata L. Greene var. yensen-4a) to trap nutrients from saline aquaculture effluent and subsequently to provide a fodder crop for livestock. Sub-surface flow wetlands containing NyPa Forage were constructed and their efficacy in removing total nitrogen, ammonia, nitrite/nitrate, total phosphorus and orthophosphate was monitored under different levels of nutrients and salinity. The wetlands removed 60 -90% of total nitrogen loads and at least 85% of ammonia, nitrite/nitrate, total phosphorus and orthophosphate loads, with greater efficiency at high nutrient and low salinity levels. The above-ground yield, sodium, crude protein (CP) and in vitro dry matter digestibility (DMD) of NyPa Forage plants were measured after fertilisation with different nutrient levels and cropping at different frequencies. Yield of plants increased with increased nutrient, while nutritive value was greater when nutrients were applied but did not differ among nutrient levels. Yield was not affected by cropping frequency, but nutritive value was greatest when plants were cropped at intervals of 21 or 42 days. At optimum nutrient addition and cropping levels, the plants had a mean CP content of 16.7 % and an in vitro DMD of 67.6 %, equivalent to an energy value of 9.5 MJ kg -1 . Assuming an equivalent fibre content and voluntary food intake as grass hay, and no accumulation of other toxic minerals, these nutritive values would be sufficient for maintenance or moderate liveweight gains in dry adult sheep or cattle. Keywords:salinity; inland saline aquaculture; effluent; constructed wetlands; saltland pasture; agri-aquaculture 3 IntroductionSecondary salinisation, in which human activities lead to high concentrations of ions (principally sodium and chloride) in the landscape, is a major environmental problem affecting freshwater and soil in many arid and semi-arid areas of the world (Ghassemi et al., 1995;Rozema and Flowers, 2008). Secondary salinisation occurs because of rising water tables, as a result of irrigation (irrigation salinity) or land clearing (dryland salinity). It is a particular problem in economically less-developed countries (e.g. India, Tunisia, Morocco, Peru and Bolivia) although more-developed regions, such as Australia, may also be badly affected (Rozema and Flowers, 2008). In Australia, the widespread clearing of native vegetation has resulted in approximately 5.7 M ha of agricultural land being adversely affected by dryland salinity, and this figure may grow to 17 M ha by 2050 (National Land and Water Resources Audit, 2001).The salinisation of agricultural land in arid regions is largely irreversible because ...

show abstract