Phycoremediation: key issues for cost-effective nutrient removal processes

Olguín, Eugenia J.

doi:10.1016/s0734-9750(03)00130-7

Cited by 344 publications

(141 citation statements)

References 46 publications

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“…Although a mixed culture was previously found to lead to an increase in overall methionine content, in plant tissue, as compared to monoculture (Ismail 1998), biomass and starch contents were not discussed. Some researchers also presumed that mixed cultures of certain favorable microalgae candidates may increase biomass production due to inherent advantages that optimize the system performance (Olguin 2003), but this has not been properly investigated. Therefore, it is still necessary to evaluate whether mixed cultures of duckweed can enhance metal recovery and biomass production, as compared to monocultures, in metal-containing wastewaters.…”

Section: Introductionmentioning

confidence: 99%

The influence of duckweed species diversity on ecophysiological tolerance to copper exposure

et al. 2015

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Section: Introductionmentioning

confidence: 99%

The influence of duckweed species diversity on ecophysiological tolerance to copper exposure

et al. 2015

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“…The selection of cyanobacteria for treatment of wastewater is dependent on their robustness against wastewater as well as their ability to grow under such conditions while absorbing nutrients from the wastewater (Olguín, 2003). In the present study, the cyanobacterium Geitlerinema sp.…”

Section: Discussionmentioning

confidence: 97%

Immobilized periphytic cyanobacteria for removal of nitrogenouscompounds and phosphorus from shrimp farm wastewater

Banerjee¹,

Khatoon²,

Shariff³

et al. 2015

Turk J Biol

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IntroductionAquaculture has grown rapidly over the last couple of decades due to significant increases in the demand for fish and seafood throughout the world. This intense development has resulted in the generation of large quantities of wastewater, which includes dissolved inorganic nitrogen and phosphorus (Kamilya et al., 2006). Nitrogenous compounds and phosphorus are major contaminants in aquaculture wastewater and their release into surrounding water bodies can cause eutrophication (Kamilya et al., 2006). It is imperative that this wastewater be treated by employing environmentally friendly and cost-effective methods.A number of techniques have been developed to control nitrogenous substances in aquaculture systems (Yusoff et al., 2011;Devaraja et al., 2013). Some of these processes tend to be either highly sophisticated or extremely complicated and expensive (Hoffmann, 1998). Several authors have demonstrated the use of cyanobacteria in treating wastewater from dairy (Boominathan and Manoharan, 2008), dye (Vijayakumar et al., 2005), and sewage (Manoharan and Subramanian, 1992), indicating that it may be a feasible option. This may be due to the fact that cyanobacteria have simple growth requirements and do not need energy-rich compounds like other nonphotosynthetic microorganisms. In addition, many cyanobacteria combine photosynthesis and nitrogen fixation, which is an advantage over other eukaryotic photosynthetic organisms (Vijayakumar, 2012).Most wastewater treatments describe microalgae growing in suspension, and there are reports of planktonic microalgae being used for removal of nitrogenous compounds from wastewater (Shelknanloymilan et al., 2012;Sriram and Seenivasan, 2012). However, one of the major limitations of this technology is the difficulty encountered in separating suspended biomass from the treated water discharge. As such, there has been an increased interest in using immobilized cyanobacteria to Abstract: Cyanobacteria can be used to remove nitrogenous compounds from wastewater, but a major bottleneck in the process is the separation of cyanobacterial biomass from the treated water discharge, which may cause eutrophication. The current study assessed the suitability of three periphytic cyanobacteria (Geitlerinema sp., Gloeotrichia sp., and Lyngbya sp.) isolated from shrimp ponds. These cyanobacteria were immobilized by self-adhesion to polyvinyl chloride sheets, forming mats, and were screened for their efficacy to reduce nitrogenous compounds and phosphorus. Among the three isolates, Geitlerinema sp. showed the highest reduction rate (98%) and was further tested using shrimp pond wastewater. The results showed that initial wastewater concentrations (mg L -1 ) of total ammonia nitrogen (5.0), nitrite nitrogen (2.9), and soluble reactive phosphorus (2.5) were significantly (P < 0.05) reduced within 7 days in tanks containing wastewater + Geitlerinema sp. mats (0.1, 0.2, and 0.8) compared to wastewater + substrate only (4.3, 2.7, and 2.3) or wastewater only (4.4, 2.8, and 2.4). In addition...

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“…Thus, it is essential to choose a suitable harvest and concentration technology in the novel process. The common harvesting techniques for microalgal biomass include natural sedimentation (Grenn et al, 1996), flocculation (Munoz and Guieysse, 2006), flotation (Grenn et al, 1996), mobilization (Olguín, 2003), centrifugation (Chisti, 2007), filtration and membrane separation. Among all these techniques, membrane separation …”

Section: Harvest Of Microalgal Biomassmentioning

confidence: 99%

Domestic Wastewater Reclamation Coupled with Biofuel/Biomass Production Based on Microalgae: A Novel Wastewater Treatment Process in the Future

et al. 2011

J. of Wat. & Envir. Tech.

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Freshwater shortage and energy crisis are the two major challenges in the 21 st century. The coupling of wastewater treatment and energy production to supply reclaimed water and sustainable energy is a very promising approach to handle these two challenges. A novel process of domestic wastewater reclamation coupled with biofuel/biomass production based on microalgae is proposed in this paper. The organic pollutants in wastewater are separated and concentrated by flocculation and filtration, and nitrogen and phosphorus are used as nutrients for microalgal cultivation. The organics separated and microalgal biomass harvested can be further processed to produce biofuel. The novel process proposed in this paper will bring about innovation in wastewater treatment, and the conventional wastewater treatment process will be transformed from a mere "treatment process" to a "production process" using wastes as raw materials and thereby can produce biofuel and other valuable by-products. At present, this novel process is in the conceptual stage, and some key techniques necessary to be further studied are also discussed in this paper.

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Phycoremediation: key issues for cost-effective nutrient removal processes

Cited by 344 publications

References 46 publications

The influence of duckweed species diversity on ecophysiological tolerance to copper exposure

The influence of duckweed species diversity on ecophysiological tolerance to copper exposure

Immobilized periphytic cyanobacteria for removal of nitrogenouscompounds and phosphorus from shrimp farm wastewater

Domestic Wastewater Reclamation Coupled with Biofuel/Biomass Production Based on Microalgae: A Novel Wastewater Treatment Process in the Future

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