The cost and effectiveness of solids thickening technologies for treating backwash and recovering nutrients from intensive aquaculture systems

Sharrer, Mark J.; Rishel, Kata L.; Taylor, Amanda; Vinci, Brian J.; Summerfelt, Steven T.

doi:10.1016/j.biortech.2010.03.101

Cited by 45 publications

(24 citation statements)

References 26 publications

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“…Also, sludge in the SE units was 13 times more concentrated than that removed from the WE mainly due to compressibility inside the settler (Sharrer, Rishel, Taylor, Vinci & Summerfelt 2010). Total suspended solids (TSS) production was lower probably due to the lower P/R ratio and lower FCR observed in this treatment.…”

Section: Water Usementioning

confidence: 99%

A comparison between water exchange and settling tank as a method for suspended solids management in intensive biofloc technology systems: effects on shrimp (Litopenaeus vannamei ) performance, water quality and water use

et al. 2016

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A comparison between water exchange and settling tank as a method for suspended solids management in intensive biofloc technology systems: effects on shrimp (Litopenaeus vannamei) performance, water quality and water use Abstract Biofloc systems rely on microbial processes in the water column to recycle animal waste products, reducing the need for water exchange. These increases biofloc concentration in the water and some form of removal is needed. An experiment was carried out to evaluate two management practices to control biofloc in Litopenaeus vannamei culture. Six tanks (48 m 3 ) were divided into two treatments: water exchange and solid settler. Shrimp were stocked at 164 shrimp m À2 and with 0.67 g of weight. After 61 days, shrimp under solid settler treatment demonstrated mean weight of 12.7 AE 0.5 g with survival of 73.8 AE 1.4%, and those under water exchange had a final weight of 10.1 AE 0.2 g and survival rate of 57.8 AE 11.1%. Total suspended solids did not differ between the treatments: 326.8 AE 24.9 mg L À1 for water exchange and 310.9 AE 25.3 mg L À1 for solid settlers. Settleable solids and productivity/respiration ratio was higher (P < 0.05) in water exchange treatment, indicating differences in physical and biological characteristics of bioflocs. Solids removal method influenced the water use, in which 1150 AE 249 L of water was necessary to produce one kilogram of shrimp using water exchange strategy, and 631 AE 25 L kg À1 with the use of settlers. Our results indicate that continuous operation of settlers can reduce variability in solids characteristics and water quality variables such as ammonia. Both strategies are efficient in controlling biofloc concentrations of the water; however, settlers can reduce water use and improve shrimp production.

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Section: Water Usementioning

confidence: 99%

A comparison between water exchange and settling tank as a method for suspended solids management in intensive biofloc technology systems: effects on shrimp (Litopenaeus vannamei ) performance, water quality and water use

et al. 2016

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“…However, the minimal water use associated with RAS technology concentrates wastes into (i) a solid waste/wastewater stream associated with solids settling/dewatering and (ii) an effluent stream. The waste/wastewater stream typically contains high concentrations of suspended solids and high biochemical oxygen demand (BOD) and chemical oxygen demand (COD) stemming from concentration and dewatering of fish manure and uneaten fish feed using technologies such as gravity thickening settlers or inclined belt filters (Sharrer et al, 2010). The effluent stream is generated from a small flushing or "exchange" flow that is added to the fish production system to help dilute the accumulation of nitrate (NO 3 -) in the fish tanks.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Hydraulic Retention Times in Denitrifying Woodchip Bioreactors Treating Recirculating Aquaculture System Wastewater

et al. 2016

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The performance of wood-based denitrifying bioreactors to treat high-nitrate wastewaters from aquaculture systems has not previously been demonstrated. Four pilot-scale woodchip bioreactors (approximately 1:10 scale) were constructed and operated for 268 d to determine the optimal range of design hydraulic retention times (HRTs) for nitrate removal. The bioreactors were operated under HRTs ranging from 6.6 to 55 h with influent nitrate concentrations generally between 20 and 80 mg NO 3 − -N L −1 . These combinations resulted in N removal rates >39 g N m −3 d −1 , which is greater than previously reported. These high removal rates were due in large part to the relatively high chemical oxygen demand and warm temperature (~19°C) of the wastewater. An optimized design HRT may not be the same based on metrics of N removal rate versus N removal efficiency; longer HRTs demonstrated higher removal efficiencies, and shorter HRTs had higher removal rates. When nitrate influent concentrations were approximately 75 mg NO 3 -N L −1 (n = 6 sample events), the shortest HRT (12 h) had the lowest removal efficiency (45%) but a significantly greater removal rate than the two longest HRTs (42 and 55 h), which were N limited. Sulfate reduction was also observed under highly reduced conditions and was exacerbated under prolonged N-limited environments. Balancing the removal rate and removal efficiency for this water chemistry with a design HRT of approximately 24 h would result in a 65% removal efficiency and removal rates of at least 18 g N m −3 d −1 . Optimizing Hydraulic Retention Times in Denitrifying WoodchipBioreactors Treating Recirculating Aquaculture System Wastewater Christine Lepine,* Laura Christianson, Kata Sharrer, and Steven Summerfelt E nhanced-denitrification bioreactors are a farm-or field-scale technology designed to address increasing levels of reactive nitrogen (N) in the environment (Schipper et al., 2010a). Such N pollution from agricultural sources is a causal agent in eutrophication, hypoxia (dead zones), and habitat degradation, resulting in a loss of biodiversity in coastal waters worldwide (Galloway et al., 2003). Over the past 20 yr, wood-based heterotrophic denitrifying bioreactors have been used to mitigate nonpoint source N pollution associated with agricultural tile drainage and groundwater (Robertson and Cherry, 1995;Woli et al., 2010;Christianson et al., 2012;Schmidt and Clark, 2012) as well as N pollution from point sources like greenhouses (Warneke et al., 2011). Other agricultural point sources, in particular land-based recirculating aquaculture systems (RAS), stand to benefit greatly from such relatively simple denitrification technologies (van Rijn et al., 2006).Fish protein consumption has increased 3.6% per year since 1961, which is double the worldwide population growth of 1.8% per year (WHO, 2015). To meet this growth demand in the face of increasingly stringent restrictions on wild ocean resources, there is a market-based need for the aquaculture industry to expand. As an efficien...

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“…A simple integration of CTW into a recirculating hatchery was conducted by Buřič et al (Buřič et al, 2015) in the Czech Republic that different from traditional RASs which generally involve specialized technologies, such as microsieve filtration, ozonization, and UV sterilization (Azaizeh et al, 2013;Good et al, 2011;Sharrer et al, 2010;Terjesen et al, 2013). This study indicated that CTW integration has the potential to increase production (potential final biomass with CW use was estimated to be 40% greater than without CW use) of a recirculating hatchery without added operational or environmental costs.…”

Section: Constructed Treatment Wetlands Invoked For Effluent Treatmentmentioning

confidence: 98%

Integrated wetlands for food production

Chen

Wong

2016

Environmental Research

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The widespread use of compound pelleted feeds and chemical fertilizers in modern food production contribute to a vast amount of residual nutrients into the production system and adjacent ecosystem are major factors causing eutrophication. Furthermore, the extensive development and application of chemical compounds (such as chemical pesticides, disinfectants and hormones used in enhancing productivity) in food production process are hazardous to the ecosystems, as well as human health. These unsustainable food production patterns cannot sustain human living in the long run. Wetlands are perceived as self-decontamination ecosystems with high productivities. This review gives an overview about wetlands which are being integrated with food production processes, focusing on aquaculture.

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The cost and effectiveness of solids thickening technologies for treating backwash and recovering nutrients from intensive aquaculture systems

Cited by 45 publications

References 26 publications

A comparison between water exchange and settling tank as a method for suspended solids management in intensive biofloc technology systems: effects on shrimp (Litopenaeus vannamei ) performance, water quality and water use

A comparison between water exchange and settling tank as a method for suspended solids management in intensive biofloc technology systems: effects on shrimp (Litopenaeus vannamei ) performance, water quality and water use

Optimizing Hydraulic Retention Times in Denitrifying Woodchip Bioreactors Treating Recirculating Aquaculture System Wastewater

Integrated wetlands for food production

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