Showing results for: algae biomass Articles
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Aminopyridine modified Spirulina platensis biomass for chromium(VI) adsorption in aqueous solution
Chemical modification of Spirulina platensis biomass was realized by sequential treatment of algal surface with epichlorohydrin and aminopyridine. Adsorptive properties of Cr(VI) ions on native and aminopyridine modified algal biomass were investigated by varying pH, contact time, ionic strength, initial Cr(VI) concentration, and temperature. FTIR and analytical analysis indicated that ...
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Neural network and genetic programming for modelling coastal algal blooms
In the recent past, machine learning (ML) techniques such as artificial neural networks (ANN) have been increasingly used to model algal bloom dynamics. In the present paper, along with ANN, we select genetic programming (GP) for modelling and prediction of algal blooms in Tolo Harbour, Hong Kong. The study of the weights of the trained ANN and also the GP-evolved equations shows that they ...
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Biosorption of inorganic mercury onto marine alga Sargassum tenerrimum: batch and column studies
The potential of Sargassum tenerrimmum algal biomass to remove Hg (II) from aqueous solution is investigated through batch experiments with regard to the influence of solution pH, adsorbent dosage and agitation rate. The algal biomass showed increased sorption capacity with increase in solution pH in the range of 4-7 with the maximum uptake of 3 mmolg−1 at pH 7. For maximum uptake, the optimal ...
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Algal production in wastewater treatment high rate algal ponds for potential biofuel use
Wastewater treatment High Rate Algal Ponds with CO2 addition could provide cost-effective and efficient tertiary-level wastewater treatment with the co-benefit of algal biomass production for biofuel use. Wastewater grown algal biomass can have a lipid content of 10–30% of dry weight, which could be used to make biodiesel. This research investigated algal biomass and total lipid production by two ...
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Legacy of road salt: Apparent positive larval effects counteracted by negative post‐metamorphic effects in wood frogs
Road salt runoff has potentially large effects on wetland communities, but is typically investigated in short‐term laboratory trials. We investigated effects of road salt contamination on wood frogs (Rana sylvatica) by combining a field survey with two separate experiments. The field survey tested whether wood frog larval traits were associated with road salt contamination in natural wetlands. ...
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Biosorption of methylene blue by nonliving biomass of the brown macroalga Sargassum hemiphyllum
The ability of Sargassum hemiphyllum to remove methylene blue (MB) from aqueous solution was evaluated. Batch experiments were conducted to examine the effects of parameters such as initial pH, contact time, biomass dose and initial dye concentration on adsorption capacity. S. hemiphyllum before and after MB adsorption was characterized by Fourier transform infrared spectroscopy (FT-IR), ...
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Uptake of sewage derived nitrogen by Ulva rigida (Chlorophyceae) in Bahía Nueva (Golfo Nuevo, Patagonia, Argentine)
Uptake kinetics of nitrogen derived from sewage–seawater mixtures (2.5–20% v/v effluent) were determined in the laboratory for Ulva rigida (Chlorophyceae) native from Bahía Nueva (Golfo Nuevo, Patagonia, Argentine). In terms of nitrogen concentration, experimental enrichment levels varied between 53.7 and 362.3M of ammonium and between 0.77 and 6.21M of nitrate+nitrite. Uptake rates were fitted ...
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Spray drying of microalgae biomass for biofuel production
BUCHI Mini Spray Dryer B-290: Yield and total yield determination in spray dried microalgaes Recently, microalgal biomass has been recognized as a promising alternative source of raw material for biofuel production. Algal biomass has several advantages that may help to meet the need for the global demand of transport fuels, such as rapid growth rate, high lipid content, small land usage, and ...
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Denitrification of nitrogen released from senescing algal biomass in coastal agricultural headwater streams
Received for publication October 2, 2008. Assimilation of inorganic N by photoautotrophs has positive impacts on nutrient retention; however this retention is only temporary. As the biomass senesces, organic and inorganic forms of N are released back to the stream where they can be further transformed (i.e., nitrification, denitrification) or exported downstream. The purpose of this study was to ...
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Nitrogen removal during summer and winter in a primary facultative waste stabilization pond: preliminary findings from 15N-labelled ammonium tracking techniques
Nitrogen removal mechanisms and pathways within WSP have been the focus of much research over the last 30 years. Debates and theories postulated continue to refine our knowledge regarding the cycling and removal pathways for this important nutrient, but a succinct answer has yet to be provided for holistic nitrogen removal. In this study, two experimental runs using labelled 15N as a stable ...
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Nitrogen removal in maturation waste stabilisation ponds via biological uptake and sedimentation of dead biomass
In this work a set of experiments was undertaken in a pilot-scale WSP system to determine the importance of organic nitrogen sedimentation on ammonium and total nitrogen removals in maturation ponds and its seasonal variation under British weather conditions, from September 2004 to May 2007. The nitrogen content in collected sediment samples varied from 4.17% to 6.78% (dry weight) and calculated ...
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Biodiesel from wastewater: lipid production in high rate algal pond receiving disinfected effluent
The production of different species of microalgae in consortium with other micro-organisms from wastewaters may represent an alternative process, to reduce the costs, for obtaining biofuels. The aim of this study was to evaluate the influence of pre-ultraviolet disinfection (UV) in the production of lipids from biomass produced in high rate ponds. Two high rate algal ponds were evaluated: a ...
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Comparison in growth, lipid accumulation, and nutrient removal capacities of
Chlorella sp. in secondary effluents under sterile and non-sterile conditionsThe growth, lipid accumulation and nutrient removal characteristics of an oleaginous microalga Chlorella sp. HQ in two types of secondary effluents (named as X and Q) before/after sterilization were evaluated. The results show that the algal growth rates under sterilization were higher than those under non-sterilization. However, sterilization caused a significant decrease in algal lipid and ...
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Influence of phosphorus on Microcystis growth and the changes of other environmental factors
The growth processes of Microcystis aeruginosa (FACHB-41) in simulated Taihu Lake water with different phosphorus concentrations were investigated using laboratory microcosms. The algal biomass increased with the increase of phosphorus concentration when it was lower than 0.445 mg/L, while the dissolved oxygen (DO) and pH increased, dissolved inorganic nitrogen (DIN) and light intensity ...
By IOS Press
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Effect of algal recycling rate on the performance of
Pediastrum boryanum dominated wastewater treatment high rate algal pondRecycling a portion of gravity harvested algae promoted the dominance of a rapidly settling colonial alga, Pediastrum boryanum (P. boryanum) and improved both biomass productivity and settleability in High Rate Algal Pond (HRAP) treating domestic wastewater. The effect of algal recycling rate on HRAP performance was investigated using 12 replicate mesocosms (18 L) that were operated ...
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Where Do Ketones and Butanol Come From during ERD?
Acetone, butanol and other ketones are often detected at low levels during anaerobic bioremediation (Jacob et al., Battelle Bioremediation Symposium Proceedings, 2005). These compounds can be produced during anaerobic fermentation by the bacterium Clostridium acetobutylicum and a variety of related organisms growing on substrates such as potatoes, corn, rye, millet, cheese whey, apple pomace, ...
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Improved ammonium removal from industrial wastewater through systematic adaptation of wild type Chlorella pyrenoidosa
A single step process is proposed for ammonium removal from nitrogenous industrial effluents, with a concomitant generation of algal biomass. A microalgal strain found in the effluent treatment plant of a fertilizer industry in Mumbai, India was systematically adapted to remove up to 700 ppm of ammoniacal nitrogen from industrial wastewater, which is nearly four times higher than the ammonium ...
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Genotoxicity of disinfection by-products (DBPs) upon chlorination of nine different freshwater algal species at variable reaction time
Nine local dominant freshwater algal species, including green algae (Chlorella sp., Chlamydomonas sp. and Scenedesmus quadricauda), diatom (Navicula pelliculosa, Nitzschia palea Grunow and Synedra sp.), blue-green algae (Microcystis sp., Chroococcus sp. and Gloeocapsa sp.) were isolated from source water reservoirs and cultivated in the laboratory. The algal biomass was chlorinated (20 ...
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Rosebud Pilot Project - Case Study
Symbiotic Algae Cultivation System - Pilot Launch 2018 The Hamlet of Rosebud currently discharges 9,460 m3 of effluent from their 60 residences into a 30 year old septic field which is now failing. Symbiotic Envirotek Inc., in partnership with Wheatland County and the residents of Rosebud, intend to implement an Algae Cultivation BiofieldTM (ACS) that will replace the septic field and ...
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Implications of nutrient removal and biomass production by native and augmented algal populations at a municipal wastewater treatment plant
Algal monocultures (Chlorella sorokiniana and Botryococcus braunii) and algal communities native to clarifiers of a wastewater treatment plant were batch cultivated in (1) clarified effluent following a biochemical oxygen demand (BOD) removal reactor post-BOD removal clarified effluent (PBCE), (2) clarified effluent following a nitrification reactor post-nitrification clarified effluent (PNCE), ...
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