Research on the Phosphorus Removal Mechanisms and Approaches in Various Horizontal Subsurface Flow Constructed Wetlands

2012 ◽  
Vol 573-574 ◽  
pp. 599-604 ◽  
Author(s):  
Zhi Ru Tang ◽  
Yue Wen ◽  
Qi Zhou
Keyword(s):  
Phosphorus Removal ◽  
Steel Slag ◽  
Harvest Time ◽  
Phosphorous Removal ◽  
Gravel Bed ◽  
Multiple Substrates ◽  
Total Phosphorous ◽  
Removal Mechanisms ◽  
Fractionation Analysis ◽  
Optimal Harvest

This research studied that performances and mechanisms of phosphorus removal in three types of HSFCW: reed/gravel bed system (W1), multiple plants/gravel bed system (W2) and reed/multiple substrates bed system (W3). Spatial distribution and fractionation analysis of phosphorous in different substrates showed that the accumulated phosphorous in gravel, zeolite and steel slag were mainly in forms of Ca/Mg-P, residual-P and Fe/Al-P respectively. Biomass and phosphorus contained in plants harvested in early autumn was obviously higher than that contained in plants of late autumn, so the optimal harvest time should be late October. Among three systems, the phosphorus removal by adsorption and sedimentation of substrates accounted for 67%-76% of the total phosphorous removal and was the major channel for phosphorous removal. Removal by harvesting plants ranked second, accounting for 15%-21%. Other removal mechanisms accounted for about 10%. The research reveals that W3>W2>W1 in phosphorus removal efficiency in HSFCWs.

Steel slag filters to upgrade phosphorus removal in small wastewater treatment plants: Removal mechanisms and performance

2014 ◽  
Vol 68 ◽  
pp. 214-222 ◽  
Author(s):  
Cristian Barca ◽  
Daniel Meyer ◽  
Martin Liira ◽  
Peter Drissen ◽  
Yves Comeau ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Steel Slag ◽  
Removal Mechanisms ◽  
And Performance

scholarly journals Combined Metabolome and Transcriptome Profiling Reveal Optimal Harvest Strategy Model Based on Different Production Purposes in Olive

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 360
Author(s):  
Guodong Rao ◽  
Jianguo Zhang ◽  
Xiaoxia Liu ◽  
Xue Li ◽  
Chenhe Wang
Keyword(s):  
Gene Expression ◽  
Olive Oil ◽  
Expression Patterns ◽  
Transcriptome Profiling ◽  
Minor Components ◽  
Harvest Time ◽  
Rna Seq ◽  
Optimal Harvest ◽  
Harvest Strategy ◽  
Different Color

Olive oil has been favored as high-quality edible oil because it contains balanced fatty acids (FAs) and high levels of minor components. The contents of FAs and minor components are variable in olive fruits of different color at harvest time, which render it difficult to determine the optimal harvest strategy for olive oil producing. Here, we combined metabolome, Pacbio Iso-seq, and Illumina RNA-seq transcriptome to investigate the association between metabolites and gene expression of olive fruits at harvest time. A total of 34 FAs, 12 minor components, and 181 other metabolites (including organic acids, polyols, amino acids, and sugars) were identified in this study. Moreover, we proposed optimal olive harvesting strategy models based on different production purposes. In addition, we used the combined Pacbio Iso-seq and Illumina RNA-seq gene expression data to identify genes related to the biosynthetic pathways of hydroxytyrosol and oleuropein. These data lay the foundation for future investigations of olive fruit metabolism and gene expression patterns, and provide a method to obtain olive harvesting strategies for different production purposes.

Use of phenological stages of the fruits and physicochemical characteristics of the oil to determine the optimal harvest time of oil palm interspecific OxG hybrid fruits

2013 ◽  
Vol 49 ◽  
pp. 204-210 ◽  
Author(s):  
Sandra Milena Rincón ◽  
Paola Andrea Hormaza ◽  
Leidy Paola Moreno ◽  
Fausto Prada ◽  
Daysy Jazmín Portillo ◽  
...  
Keyword(s):  
Oil Palm ◽  
Physicochemical Characteristics ◽  
Harvest Time ◽  
Phenological Stages ◽  
Optimal Harvest

scholarly journals Valorisation of Ensiled Fodder Beets

1970 ◽  
Vol 66 (2) ◽  
Author(s):  
Thomas LAUWERS ◽  
Jo VICCA ◽  
Joos LATRE ◽  
Didier HUYGENS ◽  
Dirk LIPS
Keyword(s):  
Dry Matter ◽  
Nutritive Value ◽  
Energy Yield ◽  
Harvest Time ◽  
Point Of Interest ◽  
Optimal Harvest ◽  
Feeding Value ◽  
High Level ◽  
Matter Basis ◽  
The Ideal

Fodder beets (Beta vulgaris L.) are especially respected for their high feeding value and high netto-energy yield per hectare. The price per nutritive value is lowest as compared to other forages. Preservation of fodders beets demands thorough cleaning without damaging and regularly occurs as a whole in well closed piles. In addition, feeding them to the animals is labour demanding. These disadvantages enforce the research towards other preservation methods which may be able to valorise this valuable type of roughage. The preservation of fodder beets in silages using silo bags, either separately or in combination with maize was investigated. Fodder beets were harvested and ensilaged at the ideal moment of maize harvest (October) or fodder beets were harvested at the ideal moment for fodder beet harvest (November) and consequently ensilaged with previously ensilaged maize. Highest energy yields of the silages were recorded at optimal harvest time for fodder beets. Ensilaging fodder beets separately resulted in large energy losses due to effluent and dry matter losses. Using lab scale silage, possible solutions for these large losses were investigated. Addition of 10% maize did reduce the effluent losses but dry matter losses remained at a high level. Addition of 4,5 l propionic acid per ton beets reduced effluent and dry matter losses sufficiently. Ensilaging foliage was another point of interest. This appeared to result in a lowered energy yield at organic and dry matter basis, an increased amount of ashes and doubling of the iron (Fe) concentration

scholarly journals Switchgrass Harvest Time Effects on Nutrient Use and Yield: An Economic Analysis

2014 ◽  
Vol 46 (4) ◽  
pp. 487-507 ◽  
Author(s):  
Nathanial Cahill ◽  
Michael Popp ◽  
Charles West ◽  
Alexandre Rocateli ◽  
Amanda Ashworth ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Yield Loss ◽  
Maximum Yield ◽  
Sensitivity Analyses ◽  
Harvest Time ◽  
Economic Consideration ◽  
Nutrient Use ◽  
Optimal Harvest ◽  
The Cost ◽  
Economic Tradeoffs

This article analyzes economic tradeoffs among harvest date, fertilizer applied, nutrient removal, and switchgrass yield as they vary with respect to input and output prices. Economic sensitivity analyses suggest that higher biomass prices lead to earlier harvest. Optimal harvest time occurs beyond time of maximum yield because nutrient removal in the biomass is an important economic consideration. Switchgrass price premia that reflect the cost of non-optimal harvest time are driven by standing crop yield loss, nutrient removal, storage loss, and opportunity cost. These price premia could provide a mechanism to compensate producers for alternative harvest times and aid with logistics management.

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