A case study of reactions of ayu (Plecoglossus altivelis) to low concentration of suspended solids in river channels: a field experiment at a river reach scale.

2015 ◽  
Vol 18 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Yasumitsu KATO ◽  
Yukio ONODA ◽  
Terutaka MORI ◽  
Yuichi KAYABA
Keyword(s):  
Field Experiment ◽  
Suspended Solids ◽  
River Channels ◽  
Plecoglossus Altivelis ◽  
Low Concentration ◽  
River Reach

scholarly journals Effects of ethephon and urea on ripening of fruits and leaf abscission of coffee (Coffea arábica L.)

1981 ◽  
Vol 38 (1) ◽  
pp. 281-288
Author(s):  
Paulo R.C. Castro ◽  
José F. Franco ◽  
José D. Costa ◽  
Clarice G.B. Demétrio
Keyword(s):  
Field Experiment ◽  
Phosphonic Acid ◽  
Fruit Ripening ◽  
Coffea Arabica ◽  
Leaf Abscission ◽  
Coffee Plant ◽  
Low Concentration ◽  
Coffea Arabica L

A field experiment was carried out to investigate the effects of ethephon and urea on ripening of fruits and leaf abscission of coffee plant. Ethephon (2-chloroethane phosphonic acid) sprays were applied to green Coffea arábica berries 26 days before counting date in concentrations of 0.5 and 0.25 ml/1 from Ethrel (240 a.i./l). The chemical accelerated the onset of fruit ripening at both concentrations. The efficacy of ethephon was increased adding urea. Ethephon 0.5 ml/1 promoted abscission of leaves and low concentration reduced shedding of leaves. The treatments did not affect the growth and production on the next harvest.

Integrated Strategy for Treatment of Winery Wastewaters Using Flocculation, Ozonation and Fenton’s Oxidation

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Rui C. Martins ◽  
Fernando J.R. Abegão ◽  
Adrián M.T. Silva ◽  
Rosa M. Quinta-Ferreira
Keyword(s):  
Suspended Solids ◽  
Oxygen Demand ◽  
Operational Cost ◽  
Adequate Treatment ◽  
Integration Strategy ◽  
Fenton’S Oxidation ◽  
Optimal Efficiency ◽  
Fenton's Oxidation ◽  
Ozonation Process

AbstractThe present research is based on a case-study involving the development of an adequate treatment for agro-effluents originating from wineries. Flocculation, Fenton’s oxidation and ozonation processes were investigated in order to define the best integration strategy that may conduce to optimal efficiency of degradation and operational cost. Chemical oxygen demand (COD), total suspended solids (TSS), and total organic carbon (TOC) were some of the parameters used to analyze the performance of these technologies. The higher COD and TSS removals (73% and 94% respectively) were achieved combining the ozonation treatment with the Fenton process. In addition, the respective cost of COD reduction is lower in this case, when compared with other alternatives. Flocculation revealed not to be needed since in the ozonation process the suspended solids are able to be degraded.

scholarly journals WATER QUALITY ANALYSIS: A CASE STUDY IN BYRAMANGALA LAKE WATER AND SURROUNDING GROUND WATER

2017 ◽  
Vol 5 (4RASM) ◽  
pp. 71-77
Author(s):  
Babitha Rani ◽  
Dimple Bahri ◽  
Prabin Neupane ◽  
Kunal Kothari ◽  
Vishal Gadgihalli ◽  
...  
Keyword(s):  
Water Quality ◽  
Ground Water ◽  
Lake Water ◽  
Suspended Solids ◽  
Quality Analysis ◽  
Total Hardness ◽  
Water Quality Analysis ◽  
E Coli

A study was carried out to find out the water quality ofByramangala lake of Ramanagara district. The water quality of Byramangala lake water and ground water from bore wells situated in the area within 600 meters surrounding the lake was analyzed. The quality analysis of various parameters such as BODs, COD, DO, E-Coli, and pH, Total Dissolved Solids, Total Suspended Solids and Total Hardness were tested. In addition, the presence of metals such as Cadmium (Cd), Chromium (Cr), Lead (Pb), and Iron (Fe) in the lake water and ground water samples were tested. Results for the various tests conducted showed similar trends for both lake water and ground water. It was observed that certain parameters such as BOD5, and COD were beyond permissible limits as per the BIS standards for drinking water. A few remedial measures have been proposed that may help in mitigating the pollution in the selected project area Byramangala Lake.

Anaerobic treatment of low concentration waste water in an inverse fluidized bed reactor

2000 ◽  
Vol 41 (4-5) ◽  
pp. 245-251 ◽  
Author(s):  
P. Castilla ◽  
M. Meraz ◽  
O. Monroy ◽  
A. Noyola
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Specific Activity ◽  
Biomass Concentration ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Low Concentration ◽  
Inverse Fluidized Bed

Low concentration synthetic and municipal wastewaters were treated at HRT as short as 3 and 0.6 h respectively in an anaerobic inverse fluidized bed. Both bioreactors showed gas hold up due to the liquid downflow pattern of the prototype. The bioreactor operated at 3 h had a removal efficiency of 83%, specific activity of 4.5 kg CODremoved/kg IVS (d and the gas hold up varied from 23 to 55%. The reactor treating municipal wastewater had a removal efficiency of 44% when operating at 0.6 h, the specific activity was 4.2 kg CODremoved/kg IVS (d and no biogas was detected apparently because an important fraction was dissolved in the liquid phase. The biomass concentration was 13.8 and 1.1 kg IVS/m3 for synthetic and municipal wastewater and the SEM microphotographs showed a bacterial diversity for the first run and only cocci cells for the second run. The system does not remove suspended solids, so a polishing postreatment to improve water quality has to be implemented.

Sludge accumulation pattern inside oxidation ditch case study

2014 ◽  
Vol 69 (12) ◽  
pp. 2468-2475 ◽  
Author(s):  
Moharram Fouad ◽  
Ahmed El-Morsy
Keyword(s):  
Suspended Solids ◽  
Municipal Wastewater ◽  
Weather Conditions ◽  
System Failure ◽  
Oxidation Ditch ◽  
Accumulation Pattern ◽  
Mixed Liquor ◽  
Economical Design ◽  
Sludge Accumulation

The sludge accumulation pattern of an oxidation ditch (OD) plant treating municipal wastewater was observed under dry and wet weather conditions, during 3 years of operation. The accumulation patterns along the ditches and their rates were revealed. In addition, the composition of the accumulation was investigated. Finally, the ratio of sand and volatile particles, mixed liquor suspended solids (MLSS), and mixed liquor volatile suspended solids, as well as the removal efficiency were also observed against the accumulated sludge. Further, a laboratory-scale channel was used to investigate the settleability of grit after mixing with variable values of MLSS. The observed results indicated that the economical design and operation of ODs using a velocity value between 0.3–0.35 m/s is not recommended, to avoid the settling of all solids. High values of MLSS and sludge age need high horizontal velocity (more than 0.35 m/s) and more power to avoid settling problems and system failure. The influence of flow velocity on the sludge settleability was studied, enabling better planning of future ditch design and operation.

scholarly journals Forms of Nitrogen and Phosphorus in Suspended Solids: A Case Study of Lihu Lake, China

2020 ◽  
Vol 12 (12) ◽  
pp. 5026 ◽  
Author(s):  
Jialu Li ◽  
Qiting Zuo
Keyword(s):  
Water Quality ◽  
Suspended Solids ◽  
Inorganic Phosphorus ◽  
Nitrogen And Phosphorus ◽  
Lake Ecosystems ◽  
Phosphorus Forms ◽  
Sequential Extraction Method ◽  
Main Component ◽  
The Impact

Suspended solids are an important part of lake ecosystems, and their nitrogen and phosphorus contents have a significant effect on water quality. However, information on nitrogen and phosphorus forms in suspended solids remains limited. Therefore, a case study was conducted in Lihu Lake (China), a lake with characteristically high amounts of suspended solids. Nitrogen and phosphorus speciation in suspended solids was analyzed through a sequential extraction method. We also evaluated the sources of various forms of nitrogen and phosphorus and their different effects on eutrophication. The total nitrogen (TN) content was 758.9–3098.1 mg/kg. Moreover, the proportions of various N forms in the suspended solids of the study areas were ranked as follows: Hydrolyzable nitrogen (HN) > residual nitrogen (RN) > exchangeable nitrogen (EN). Total phosphorus (TP) ranged from 294.8 to 1066.4 mg/kg, and 58.6% of this TP was inorganic phosphorus (IP). In turn, calcium (Ca)-bound inorganic phosphorus (Ca-Pi) was the main component of IP. The correlation between various nitrogen and phosphorus forms showed that there were different sources of suspended nitrogen and phosphorus throughout Lihu Lake. Correlation analysis of water quality indices and comparative analysis with surface sediments showed that in Lihu Lake, the dissolved nitrogen and phosphorus contents in water were influenced by sediment through diffusion, while particle phosphorus content in water was influenced by suspended solids through adsorption; however, due to the higher phosphorus contents in suspended solids, we should pay more attention to the impact of suspended solids.

scholarly journals A Case Study of the Weather Research and Forecasting Model Applied to the Joint Urban 2003 Tracer Field Experiment. Part 1: Wind and Turbulence

2015 ◽  
Vol 158 (2) ◽  
pp. 285-309 ◽  
Author(s):  
Matthew A. Nelson ◽  
Michael J. Brown ◽  
Scot A. Halverson ◽  
Paul E. Bieringer ◽  
Andrew Annunzio ◽  
...  
Keyword(s):  
Field Experiment ◽  
Weather Research And Forecasting ◽  
Forecasting Model ◽  
Weather Research
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