Effect of light/dark cycle on nitrate and phosphate removal from synthetic wastewater based on BG11 medium by Scenedesmus sp.

The effect of light–dark cycle on the timing of larval release from jelly masses of the Mediterranean polychaete Eupolymnia nebulosa (Terebellida) was investigated. The larval emergence from the jelly mass occurs mainly during daylight. Results suggest that the larvae of E. nebulosa do not track the light–dark cycle endogenously.

Download Full-text

Nutrient removal efficiency of green algal strains at high phosphate concentrations

Water Science & Technology ◽

10.2166/wst.2019.431 ◽

2019 ◽

Vol 80 (10) ◽

pp. 1832-1843 ◽

Cited By ~ 1

Author(s):

Jairo Hernan Moreno Osorio ◽

Angelo Del Mondo ◽

Gabriele Pinto ◽

Antonino Pollio ◽

Luigi Frunzo ◽

...

Keyword(s):

Removal Efficiency ◽

Nutrient Removal ◽

Ammonium Acetate ◽

Carbon Sources ◽

Phosphate Removal ◽

Synthetic Wastewater ◽

Green Algal ◽

Nutrient Removal Efficiency ◽

High Phosphate ◽

Mixotrophic Conditions

Abstract The effects of autotrophic and mixotrophic conditions on microalgae growth and nutrient removal efficiency from synthetic wastewater by different microalgae were investigated. Although several studies have demonstrated the suitability of microalgae technologies for ammonia-rich wastewater treatment, only a few have been used for treatment of phosphate-rich industrial wastewaters. In this work, six microalgae were cultivated in batch mode in a growth medium with a high phosphate concentration (0.74 Mm PO43−-P) and different carbon sources (ammonium acetate and sodium bicarbonate) without CO2 supplementation or pH adjustment. Their potential for nutrient removal and biomass generation was estimated. The biomass growth in the reactors was modeled and the data aligned to the Verhulst model with R2 > 0.93 in all cases. Chlorella pyrenoidosa ACUF_808 showed the highest final biomass productivity of 106.21 and 75.71 mg·L−1·d−1 in media with inorganic and organic carbon sources, respectively. The highest phosphorus removal efficiency was 32% with Chlorella vulgaris ACUF_809, while the nitrate removal efficiency in all reactors exceeded 93%. The coupled cultivation of the novel isolated strains of C. pyrenoidosa and C. vulgaris under mixotrophic conditions supplemented with ammonium acetate might be a promising solution for simultaneous nitrate and phosphate removal from phosphorus-rich wastewaters.

Download Full-text

Ureolytic phosphate precipitation from anaerobic effluents

Water Science & Technology ◽

10.2166/wst.2009.193 ◽

2009 ◽

Vol 59 (10) ◽

pp. 1983-1988 ◽

Cited By ~ 7

Author(s):

E. Desmidt ◽

W. Verstraete ◽

J. Dick ◽

B. D. Meesschaert ◽

M. Carballa

Keyword(s):

Hydraulic Retention Time ◽

Ph Value ◽

Continuous Operation ◽

Phosphate Concentration ◽

Phosphate Removal ◽

Synthetic Wastewater ◽

Processing Industry ◽

Operational Conditions ◽

Constant Ph ◽

High Concentrations

In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2 + from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentrations ratio of Mg2 + :PO43−-P:NH4+ required to decrease PO43−-P concentrations from 20 to 6 mg PO43−-P/l at pH 8.4-8.5 was estimated on 4.6:1:8. In the second part of the study, lab-scale experiments with either synthetic wastewater or the anaerobic effluent from a vegetable processing industry were carried out in batch and continuous mode. Overall, the continuous operation at a hydraulic retention time (HRT) of 2.4 h and an added molar concentration [Mg2 + ]:[PO43−-P]:[NH4+] ratio of 1.6:1:2.3 resulted in a constant pH value in the reactor (around 8.5) and an efficient phosphate removal (>90%) to residual levels of 1–2 mg PO43−-P/l. Different operational conditions, such as the initial phosphate concentration, HRT and the use of CaCl2 or MgO instead of MgCl2, were analysed and the performance of the reactor was satisfactory under a broad range of them. Yet, overall, optimal results (higher phosphate removal) were obtained with MgCl2.

Download Full-text

Effect of light quality and light-dark cycle on sporulation patterns of the mite pathogenic fungus Neozygites floridana ( Neozygitales : Entomophthoromycota), a natural enemy of Tetranychus urticae

Journal of Invertebrate Pathology ◽

10.1016/j.jip.2016.04.008 ◽

2016 ◽

Vol 137 ◽

pp. 43-48 ◽

Cited By ~ 1

Author(s):

Ingeborg Klingen ◽

Maren Pindsle Holthe ◽

Karin Westrum ◽

Aruppillai Suthaparan ◽

Torfinn Torp

Keyword(s):

Tetranychus Urticae ◽

Natural Enemy ◽

Light Quality ◽

Pathogenic Fungus ◽

Dark Cycle ◽

Neozygites Floridana ◽

Effect Of Light

Download Full-text

Phosphate removal by column packed blast furnace slag ‐ I. Fundamental research by synthetic wastewater

Environmental Technology Letters ◽

10.1080/09593338709384521 ◽

1987 ◽

Vol 8 (1-12) ◽

pp. 589-598 ◽

Cited By ~ 9

Author(s):

Hiroshi Sunahara ◽

Wei Min Xie ◽

Mitsu Kayama

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Phosphate Removal ◽

Synthetic Wastewater ◽

Fundamental Research ◽

Furnace Slag

Download Full-text

Resetting Process of Peripheral Circadian Gene Expression after the Combined Reversal of Feeding Schedule and Light/Dark Cycle Via a 24-h Light Period Transition in Rats

Physiological Research ◽

10.33549/physiolres.931818 ◽

2010 ◽

pp. 581-590

Author(s):

T Wu ◽

Y Ni ◽

F Zhuge ◽

Z Fu

Keyword(s):

Time Course ◽

Clock Genes ◽

Dark Period ◽

Light Period ◽

Feeding Schedule ◽

Circadian Gene ◽

Dark Cycle ◽

Peripheral Clocks ◽

Effect Of Light

To investigate the effect of light cue on the resetting of the peripheral clocks, we examined the resetting processes of clock genes (Per1, Per2, Bmal1, Cry1, Dec1, and Rev-erbα) in the liver and heart of rats after the feeding and light-dark (LD) reversal via a 24-h light period transition. The liver clock was reset quickly within 3 days, while the heart clock needed a longer time course of 5-7 days to be completely re-entrained. Moreover, the reentrainment of Per1 and Per2 in the liver clock was more rapid than that of the other four clock genes, suggesting the important role of these two clock genes in initiating the circadian resetting of the hepatic clock. However, the resetting rates of these two clock genes were as similar as the others in the heart clock. Therefore, the resetting mechanisms underlining these two peripheral clocks may be totally distinct. Furthermore, the reentrainment of the liver and heart clocks were relatively lengthened after the feeding and LD reversal via a light period transition compared to a dark period transition, suggesting a simultaneous shift of feeding schedule and the LD cycle may facilitate the circadian resetting in rats.

Download Full-text