Effect of Wastes Quality on Treatment Efficiency with Duckweed

Oron, Gideon; Willers, H.C.

doi:10.2166/wst.1989.0266

Cited by 18 publications

(7 citation statements)

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“…In this study the duckweed ponds achieved dry matter yields in a range of 126-139 Kg/ha/d. This range is comparable to the range of 74-164 kg/ha/d that has been published for duckweed Lemna gibba fed with domestic sewage (Oron et al, 1987;Oron and Willers, 1989;Van der Steen et al, 1998). In this study, the range of protein content of the dry matter of duckweed was 20-22% in the first run and 35-39.5% in the second run.…”

Section: Nitrogen Mass Balance and Biomass Production In Duckweed Pondssupporting

confidence: 85%

“…The data in the literature review showed that the dry matter content of Lemna species ranged between 4.5 and 5.4% (Oron et al, 1987;Oron and Willers, 1989;Boniardi et al, 1994;Ennabili et al, 1998). In this study the duckweed ponds achieved dry matter yields in a range of 126-139 Kg/ha/d.…”

Section: Nitrogen Mass Balance and Biomass Production In Duckweed Pondsmentioning

confidence: 53%

“…The results of this study in the two experimental runs showed that protein content of duckweed is positively affected by the nitrogen content of wastewater. Some authors reported similar conclusions (Culley and Epps, 1973;Oron et al, 1987;Oron and Willers, 1989).…”

Section: Nitrogen Mass Balance and Biomass Production In Duckweed Pondsmentioning

confidence: 64%

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Nitrogen recovery in an integrated system for wastewater treatment and tilapia production

et al. 2007

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An integrated system, consisting of Up-flow Anaerobic Sludge Blanket (UASB)-duckweed-tilapia ponds was used for recovery of sewage nutrients and water recycling. A UASB reactor with 40 liter working volume was used as pre-treatment unit followed by a series of three duckweed ponds for nitrogen recovery. The treated effluent and duckweed biomass was used to feed fishponds stocked with Nile tilapia (Oreochromis niloticus). The UASB reactor was fed with raw, domestic sewage at 6 h hydraulic retention time. The three duckweed ponds were stocked with Lemna gibba and fed with UASB effluent at 15 days hydraulic retention time. Nitrogen recovery from UASB effluent via duckweed biomass represented 81% of total nitrogen removal and 46.5% from the total nitrogen input to the system. In subsequent fishponds the nitrogen recovery from duckweed as fish feed was in the range of 13.4-20%. This nitrogen in fish biomass represented 10.6-11.5 g N from the total nitrogen in the raw sewage fed to the UASB reactor. The growth performance of tilapia (Oreochromis niloticus) showed specific growth rates (SGR) in the range of 0.53-0.97. The range of feed conversion ratio (FCR) and protein efficiency ratio (PER) were 1.2-2.2 and 2.1-2.28, respectively. The results of the experiments showed total fish yield and net fish yield in the range of 17-22.8 ton/ha/y and 11.8-15.7 ton/ha/y respectively. In conclusion UASB-duckweed-tilapia ponds provide marketable by-products in the form of duckweed and fish protein, which represent a cost recovery for sewage treatment.

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Section: Nitrogen Mass Balance and Biomass Production In Duckweed Pondssupporting

confidence: 85%

Section: Nitrogen Mass Balance and Biomass Production In Duckweed Pondsmentioning

confidence: 53%

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Nitrogen recovery in an integrated system for wastewater treatment and tilapia production

et al. 2007

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“…Alaerts et al (1996) demonstrated that the duckweed sewage stabilization pond system achieved 74% and 77% removal of nitrogen and phosphorus, respectively. Oron and Willers (1989) observed biochemical oxygen demand (BOD) removal values for L. gibba-covered miniponds of about 92% at 20-day total HRT using settled sewage. Oron et al (1988) reported using duckweed for domestic wastewater treatment to recycle the nutrients.…”

Section: Introductionmentioning

confidence: 99%

Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale

Priya

Avishek

Pathak

2011

Environ Monit Assess

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Water crisis is one of the most serious problems faced by the world today. Phytoremediation is one of the serious efforts towards sustainability. Macrophyte-based wastewater treatment systems have several potential advantages compared with conventional treatment systems. Duckweeds (Lemna spp., Spirodela spp., Wolffia spp.) are small, green freshwater, free-floating aquatic plants. The primary objective of this work was to analyze the role of duckweeds in organic waste and nutrient removal from domestic wastewater being generated from hostels of Birla Institute of Technology, Mesra, Ranchi (India). Interesting results were obtained in which the BOD value reduced by 94.45% and the level of orthophosphate at the end of the work was found to be reduced by 79.39%. The duckweeds flourished well during the experimental period in the pH range of 7 to 8; it can be said that, other factors remaining favorable, the optimum pH for duckweed growth ranges from 7 to 8. Therefore, it can be concluded that this treatment can be successfully carried out on a large scale. Also, it is a low-cost solution to wastewater treatment problems and could satisfy the discharge standards.

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“…Thus, duckweed systems can be used for combined tertiary treatment and reuse of nutrients as animal feed. The generation of this valuable biomass may offer another competitive advantage of duckweed systems over algal stabilization ponds, and make up for their highly labor-intensive operation disadvantage (Cheng and Stomp, 2009;El-Kheir et al, 2007;FAO, 1999;Iqbal, 1999;Kadlec, 2006;Nhapi et al, 2001;Oron and Wilers, 1989;Ran et al, 2004;Reed et al, 2006;Tavares et al, 2010;Willett, 2005;Zirschky and Reed, 1988).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Performance of Full‐Scale Duckweed and Algal Ponds Receiving Septage

Papadopoulos¹,

Metaxa²,

Iatrou³

et al. 2014

Water Environment Research

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The performance of duckweed and algal systems in removing fecal bacteria, organic matter, and nutrients was evaluated in three full‐scale ponds operating in series. Trucks collected septage from holding tanks and discharged it into the system, daily. The inflow rates varied between the warm and the cold season. Duckweed and algae naturally colonized the ponds in two successive periods of 10 and 13 months, respectively. Environmental conditions were determined at various pond depths. Without harvesting, the duckweed system was neutral and anoxic. Alkaline and oversaturation conditions were observed in the algal system. The overall removals of 5‐day biochemical oxygen demand, total suspended solids, total nitrogen removal, and orthophosphate (ortho‐PO43–) ranged from 94 to 97, 62 to 84, 68 to 74, and 0 to 26%, respectively. The E. coli and enterococci reductions varied between 2.2 to 3.0 and 1.1 to 1.4 log units, respectively. The upper values were always associated with the algal system.

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Effect of Wastes Quality on Treatment Efficiency with Duckweed

Cited by 18 publications

References 0 publications

Nitrogen recovery in an integrated system for wastewater treatment and tilapia production

Nitrogen recovery in an integrated system for wastewater treatment and tilapia production

Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale

Evaluation of Performance of Full‐Scale Duckweed and Algal Ponds Receiving Septage

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