The Experts below are selected from a list of 46476 Experts worldwide ranked by ideXlab platform
Sanni L Aalto - One of the best experts on this subject based on the ideXlab platform.
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the effect of peracetic acid on microbial community Water Quality nitrification and rainbow trout oncorhynchus mykiss performance in recirculating aquaculture systems
Aquaculture, 2020Co-Authors: Suvi Suurnakki, Jani Pulkkinen, Petra C Lindholmlehto, Marja Tiirola, Sanni L AaltoAbstract:Abstract Microbial biofilters control Water Quality and enable the overall function of recirculation aquaculture systems (RAS). Changes in environmental conditions can affect the abundance and interactions of the diverse microbial populations of the biofilter, affecting nitrification of harmful ammonium and thus fish health. Here, we examined the effect of different application frequencies (0, 1, 2 and 4 times per week) of a common disinfectant, peracetic acid (PAA, applied 1.1 mg l−1 twice per day), on biofilter microbial communities, focusing especially on nitrifying microbial groups and using a high throughput sequencing of 16S rRNA gene and quantitative PCR (qPCR). In addition, we measured biofilter nitrification rates, Water Quality parameters, and fish performance. Although PAA additions did not significantly change the overall microbial community composition or abundance, the abundance of ammonia-oxidizing bacteria (AOB) and nitrate-oxidizing bacteria (NOB) first decreased at the beginning of the experiment but increased in numbers towards the end of the experiment with frequent PAA applications. PAA application decreased the nitrification rate, but increased the Water Quality in terms of reduced ammonium levels. PAA application did not significantly affect fish growth, but higher mortality was observed with the highest PAA application level of 4 times per week. These results suggest that when applied before the fish tank, PAA can be used for temporary Water Quality Improvement without disturbing microbial communities. However, the application frequency required for persistent Water Quality Improvement caused increased mortality.
Yuanhsiou Chang - One of the best experts on this subject based on the ideXlab platform.
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Water Quality Improvement with artificial floating islands
Ecological Engineering, 2015Co-Authors: Yuanhsiou ChangAbstract:Abstract As the natural purification of the traditional artificial floating island is very slow, the purpose of this research is to explore the efficiency of the green energy artificial floating island (GAFI) to improve Water Quality. We constructed experimental models near the bank of Lize Lake at MingDao University in Taiwan, where the surrounding Waters and wasteWater from the dormitories served as the sources for Water purification and treatment. In the field of the experimental model, three Water tanks, each of which is 165 cm in depth and 130 cm in diameter, with 2 tons of Water in total, were buried as the experimental containers. The GAFI area is 60 × 60 cm equipped with three kinds of aquatic plants: Typha orientalis Presl, Eleocharis dulcis and Juncus effuses, as the vegetation purification plants, and an aerator device powered by solar power. According to our experimental results, GAFI can effectively break down stratified Water into homogenized Water and inhibit algae growth. The dissolved oxygen and oxygen reduction potential were increasing when the GAFI was used, and the NH3–N, NO3–N and NO2–N were effectively decreased. As GAFI can quickly enhance Water Quality, it is worth promoting its application for Water landscapes and environmental conservation in the future.
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solar powered artificial floating island for landscape ecology and Water Quality Improvement
Ecological Engineering, 2014Co-Authors: Yuanhsiou Chang, Naichia YehAbstract:Abstract This study uses solar artificial floating islands (SAFI) for Water purification and biological conservation. The site of experiment is set up on a lake shore on a university campus, where the eutrophic contents of lake and sewage from the student dormitory are used for result assessment. The study demonstrates that the SAFI is able to reduce the EC of the eutrophic contents by 30% and enhance dissolved oxygen (DO) by 2.8 times. The SAFI is also able to reduce electric conductivity of dormitory sewage by 34% and increase dissolved oxygen by 982 times. After the Improvement, the oxidation–reduction property is above +100 mV and the oxidation activities in samples are vigorous. The habitation of Ischnura senegalensis, Leucauge magnifica Yaginuma, and Duttaphrynus melanostictus can be observed in the SAFI enhanced Water area, while the area without the influence of the SAFI lacks dissolved oxygen and Water plants, which results in the common Culicidae, Hirudo nipponica Whitman, and Chironomida in rotten Water. This research shows that the SAFI has determinant influence on the ecology and Water Quality Improvement.
Edward P Kolodziej - One of the best experts on this subject based on the ideXlab platform.
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evaluating emerging organic contaminant removal in an engineered hyporheic zone using high resolution mass spectrometry
Water Research, 2019Co-Authors: Katherine T Peter, Skuyler Herzog, Zhenyu Tian, John E Mccray, Katherine Lynch, Edward P KolodziejAbstract:Abstract The hyporheic zone (HZ), located at the interface of surface and groundWater, is a natural bioreactor for attenuation of chemical contaminants. Engineered HZs can be incorporated into stream restoration projects to enhance hyporheic exchange, with flowpaths optimized to promote biological habitat, Water quantity, and Water Quality Improvements. Designing HZs for in-stream treatment of stormWater, a significant source of flow and contaminant loads to urban creeks, requires assessment of both the hydrology and biogeochemical capacity for Water Quality Improvement. Here, we applied tracer tests and high resolution mass spectrometry (HRMS) to characterize an engineered hyporheic zone unit process, called a hyporheic design element (HDE), in the Thornton Creek Watershed in Seattle, WA. Dye, NaCl, and bromide were used to hydrologically link downwelling and upwelling zones and estimate the hydraulic retention time (HRT) of hyporheic flowpaths. We then compared Water Quality Improvements across hydrologically-linked surface and hyporheic flowpaths (3–5 m length; ∼30 min to >3 h) during baseflow and stormflow conditions. We evaluated fate outcomes for 83 identified contaminants during stormflow, including those correlated with an urban runoff mortality syndrome in coho salmon. Non-target HRMS analysis was used to assess holistic Water Quality Improvements and evaluate attenuation mechanisms. The data indicated substantial Water Quality Improvement in hyporheic flowpaths relative to surface flow and improved contaminant removal with longer hyporheic HRT (for ∼1900 non-target compounds detected during stormflow, 50% via surface flow vs. 59% and 78% via short and long hyporheic residence times, respectively), and strong contributions of hydrophobic sorption towards observed contaminant attenuation.
Boqiang Qin - One of the best experts on this subject based on the ideXlab platform.
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lake eutrophication control countermeasures and recycling exploitation
Ecological Engineering, 2009Co-Authors: Boqiang QinAbstract:Abstract Eutrophication is a world-wide environmental issue. Lake Taihu is a typical large, shallow, eutrophic lake located in delta of River Changjiang (Yangtze River). A large-scale ecological engineering experiment targeted at Water Quality Improvement was implemented in Meiliang Bay, Lake Taihu. In this special issue, there are six papers related to Water purification and algal bloom control techniques applied in this experiment. Four papers address the validity and efficiency of Water Quality Improvement of this ecological engineering and one paper presents a similar but small-size ecological engineering. The others focus on macrophyte restoration, aquatic plant management and recycling exploitation. The editorial paper highlights the main results and conclusions from these papers.
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Water Quality Improvement and phytoplankton response in the drinking Water source in meiliang bay of lake taihu china
Ecological Engineering, 2009Co-Authors: Feizhou Chen, Xiaolan Song, Zhengwen Liu, Boqiang QinAbstract:Abstract Water Quality experienced changes throughout the 3-year ecological engineering experiment in the drinking Water source in Meiliang Bay of Lake Taihu. Average concentrations of TN, TP, NH 4 + , BOD 5 and transparency in the drinking Water source during the period of July–December 2005 were 1.85, 0.13, 0.23, 3.03 mg L −1 and 27.5 cm, respectively, decreasing by 47.9%, 21.2%, 83.3%, 54.4% and 24.2%, compared to concentrations from the same period in 2003. Concentrations of chlorophyll a and COD were 89.9 μg L −1 and 6.45 mg L −1 , increasing by 27.9% and 17.7%, compared to the values in 2003. Cyanobacteria (mainly Microcystis ) dominated the phytoplankton community in the ecological engineering area during July–December 2005. Densities of cyanobacteria and Microcystis were higher in 2005 than in 2004 and higher inside the engineering area than outside. Density percentages of cyanobacteria and Microcystis to total algae were above 90% and 60% during the bloom period. Average density of flagellate algae was higher during July–December 2005 than in 2004. Changes in Water Quality in the engineering area resulted mainly from the weakening of waves, decrease in concentrations of suspended solids, and assimilation of mass algae and periphytons. In spite of initial Improvement of Water Quality, cyanobacterial bloom still determined the phytoplankton dynamics and variations. Additionally, nutrient concentration still remained at a high level without control of external loading. Therefore, a more holistic approach and long-term management should be adopted in Lake Taihu.
Rinaldi Rachman - One of the best experts on this subject based on the ideXlab platform.
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swro feed Water Quality Improvement using subsurface intakes in oman spain turks and caicos islands and saudi arabia
Desalination, 2014Co-Authors: Rinaldi Rachman, Thomas M MissimerAbstract:Abstract Water Quality sampling and analysis conducted at four global locations, along the shorelines of the Arabian Sea, the Red Sea, the Mediterranean Sea, and the Caribbean Sea, demonstrated that subsurface intakes (wells) provide a robust degree of feed Water treatment close to that provided by energy-intensive, conventional pretreatment systems. SDI values were reduced in virtually all cases to below 3. In vertical wells, from 70 to 100% of the TEP and 50% of the TOC and DOC found in natural seaWater were removed in the aquifer. Reduction in the concentration of the organic fractions was selective based on molecular weight with the biopolymers nearly fully removed. Humic substances, building blocks, and light organic substances were removed at lesser percentages. Site geology was not the predominant factor affecting the removal efficiency, but the length of the flow path from the sea to the wells and the hydraulic retention time appear to be most significant. A comparison between vertical wells, a tunnel intake system, and a horizontal drain system at Alicante, Spain, demonstrated that the vertical wells performed best followed by the tunnel system, and the horizontal drain system which showed a breakthrough of algae and a very high organic carbon concentration.
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subsurface intakes for seaWater reverse osmosis facilities capacity limitation Water Quality Improvement and economics
Desalination, 2013Co-Authors: Thomas M Missimer, Noreddine Ghaffour, Abdullah H A Dehwah, Rinaldi RachmanAbstract:Abstract The use of subsurface intake systems for seaWater reverse osmosis (SWRO) desalination plants significantly improves raw Water Quality, reduces chemical usage and environmental impacts, decreases the carbon footprint, and reduces cost of treated Water to consumers. These intakes include wells (vertical, angle, and radial type) and galleries, which can be located either on the beach or in the seabed. Subsurface intakes act both as intakes and as part of the pretreatment system by providing filtration and active biological treatment of the raw seaWater. Recent investigations of the Improvement in Water Quality made by subsurface intakes show lowering of the silt density index by 75 to 90%, removal of nearly all algae, removal of over 90% of bacteria, reduction in the concentrations of TOC and DOC, and virtual elimination of biopolymers and polysaccharides that cause organic biofouling of membranes. Economic analyses show that overall SWRO operating costs can be reduced by 5 to 30% by using subsurface intake systems. Although capital costs can be slightly to significantly higher compared to open-ocean intake system costs, a preliminary life-cycle cost analysis shows significant cost saving over operating periods of 10 to 30 years.
