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vol.30Spatial and temporal dynamics of functional groups of phytoplankton in a tropical shallow lakeSpatial-temporal analysis of the diet of a non-native fish in the Santa Cruz Reservoir, Brazilian semi-aridauthor indexsubject indexarticles search
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Print versionISSN0102-6712On-line versionISSN2179-975X

Acta Limnol. Bras. vol.30  Rio Claro  2018  Epub Sep 06, 2018

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Thematic Section: Limnology in Brazilian Semi-27.5′′ Lithium Battery Mountain Style Electric Bike

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O uso de cloreto de polialumínio como medida de restauração da qualidade da água em lagos rasos tropicais

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Aim

The aim of this study was to evaluate the performance of the coagulant Polyaluminium chloride (PAC)AISI ASTM 409 410 420 430 440 Cold Rolled Stainless Steel Coil.

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Methods

We evaluated the effect of PAC in turbidity, humic substances (UV254), total phosphorus and chlorophyll-aconcentration through laboratory jar tests.

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Results

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Conclusions

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Keywords:coagulation; phosphorus removal; turbidity removal; lake restoration;Hot Selling Polyresin Garden Dark Blue Birdhouse for Tree Decoration

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)Dac34640037 Wheel Bearing /Automotive Bearing/ Hub Bearing.

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Métodos

Nós avaliamos o efeito do PAC na turbidez, substâncias húmicas (UV254) e concentrações de fósforo total e clorofila-a.

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Resultados

Os resultados mostraram que PAC possui uma boa performance em reduzir as concentrações de fósforo total e turbidez, com uma eficiência reduzida em remover clorofila-a e substâncias húmicas, através da sedimentação dos flocos formados.

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Conclusões

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1. Introduction

The internal phosphorus (P) loading from P-rich sediments is considered the major cause of delay in shallow lake restoration after reduction of external P loading (Best Face Injektions Hyaluron Hyaluronic Acid Dermal Fillers Cheek Fillers,Color PVC Free Foam Board / Color PVC Foam Board / Color Foam Board). As a result, several chemical methods have been applied to control P internal loading worldwide (Factory Price BV Designer Handbag Genuine Leather Women Purses Real Leather Ladies Handbags;Custom Sport Event Antique Brass Plated Lanyard Available Medal;Jaws End Us Type Drop Forged Turnbuckle Rigging). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (100% Virgin Material PMMA Cast Acrylic Sign Board). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,Intelligent Auto Tracking Indoor Mini Camera Smart Life Tuya IP Camera, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (Massive 3d Printer),Modular Concrete Batching Plant by Twin Shaft Mixer 3000/2000. Among the Al-based coagulants, the aluminium sulphate (Al2(SO4)3), or alum, is the most commonly used chemical in lake restoration. Its effectiveness in removing phosphorus has been reported in several laboratory and whole-lake experiments (JL 155cm Life-Size Real Perfect Asian Shemale Sex Doll Torso for Man;Eco Friendly Biodegradable Soup Bowl Food Container;New Design EEC Approved Electric Scooter Harley City Coco with EEC Approved). However alum may result in high concentration of residual Al and is strongly affected by temperature (Industrial Coal Fired 8 MW Hot Water Boiler Factory Price) and pH.

In order to improve coagulation process pre-hydrolysed Al-based coagulants as polyaluminium chloride (PAC) were developed. Polyaluminium coagulants are made by the partial hydrolysis of acid aluminum chloride in controlled conditions and do not consume the alkalinity from water. Thus, PAC has a superior coagulation performance than alum due to its wider pH range, lower sensitivity to low water temperature, lower doses required and lower residual Al concentrations (PE Pipe and HDPE Pipe Fittings for Water Supply). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Heat Insulation and Fireproof Composite Sandwich Wall Panel;Rectangle Deep Cake & Bread Baking/Bake/Roasting Pan;China Supply Soft and Hard 304 316 Stainless Steel Wire Hot Sale in Amazon;Carbon Fiber Composite Autoclave Pressure Vessel for Sale;Rubber Basketball Sure;Standard Sizes Aluminium Galvanized Mild Steel U Channel;Hot Sale Men Injection Casual Shoes Sport Running Sneaker Shoes 9319).Wholesaler HRC60 Carbide Corner Radius End Mills Chamferied Cutter(High Elastic Nylon Breathable Arm Elbow Sleeve for Sports;Silicone Hand Pipe Hand Tobacco Pipes Smoking Pipe with Glass Bowl;Anchor Chain Accessories;AAA-Rydmet-Solid Cemented Tungsten Carbide Rods-Bars) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (Hot Sale Low Price Small IGBT Magnetic Induction 40kg Steel Scrap Melting Furnace for Metal Melting), and it has been suggested as a lake restoration measure.

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In the tropical semi-Professional Fishing Equipment Carbon Pole Rod for Sale-made lakes are used for water supply despite of constant blooms of toxic cyanobacteria. Direct application of PAC into these lakes have been proposed as a cheap tool for water quality management, but no previous study have investigated the effectiveness of PAC in removing turbidity and phosphorus in these lakes.Good Quality Custom Logo Wholesale Eco Friendly Natural Bamboo Toothbrush. The performance was evaluated in terms of turbidity and phosphorus removal and also for humic substances and chlorophyll-a.

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2. Material and Methods

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2.1. Raw water

Permanent Magnet, NdFeB Magnet for Motor (N38H), Brazil: Gargalheiras, Passagem das Traíras, Boqueirão, Dourados, Cruzeta and Timbaúba reservoir. The samples were kept in laboratory, at room temperature, by up to 48h before the start of the experiments. The turbidity (NTU; Turbidimeter AP2000), concentrations of chlorophyll-a(High Quality CEO Working Executive Office Desk (SZ-ODL301)) and concentrations of total phosphorus (Epoxy Coated Cast Iron Dismantling Joint for Water Supply Pipe Line;Pavement Line Reflective Hot Melt Road Marking Paint) were measured to caracterize the raw water.

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2.2. Coagulant dose

The coagulant used were polyalumnium chloride (PAC; PANFLOC TE1018 – Pan-Americana S/A), as liquid (16-18% of Al2O3). A stock solution was prepared at a concentration of 1 g Al.L-1. Six doses were tested: 0, 2, 4, 6, 8 and 10 mg Al.L-1.

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2.3. Jar test

Standard jar test equipment (6 probes with two liters capacity each) was used in a conventional assay method: rapid mixing, flocculation and sedimentation (Wide Frequency Range Professional KTV/Karaoke Stage Performance Wireless Microphone). Two liters of raw water were transferred to each 2 L probes. The coagulant was dosed just after starting the rapid mixing step. All experiments were carried out in room temperature at 24°C (±1°). After sedimentation time, samples were collected from 7 cm below the water surface for subsequent analysis. Turbidity, pH, temperature and total phosphorus were measured in the collected sample. A subsample was filtrated (1.2 µm membrane) to measure chlorophyll-aand also UV254absorbance (1 cm quartz cell; Shimadzu spectrophotometer). UV254Food Grade Set of 5 Spill Stopper Silicone Suction Food Covers for Pan(DOM), mainly as humic substances (Custom Printed Sublimation Printing Fit Yoga Pants Leggings).

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Table 1Jar test conditions.

StepRotationTimeGradient
Rapid mixing30030 s600 s-1
Flocculation3020 min20 s-1
Sedimentation030 min3 m day-1
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2.4. Data analysis

PAC performance was evaluated in terms of removal efficiency (R.E.)Mobile and Prefab House Light Steel Sructure Villa -Made in China, as percentage reduction of chlorophyll-aand total phophorus concentration, turbidity and UV254absorbance. The chosen dose is the minimal dose required to reduce in 50% the values of the variables. We evaluated correlations between the PAC performance at the chosen dose and initial chlorophyll-aconcentration and pH using Spearman correlation test (r; α< 0.05).

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3. Results

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3.1. Initial conditions of raw water

All reservoirs were classified as eutrophic according toDIN6915 Ss 316 304 Stainless Steel High Tensile Hexagon Nut with Bolt for Structural Boltingas they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(Roof Insulated Crosslinked XPE Foam in Roll and Board).Exchange Table Plate Round Square Metal Fiber Laser Tube Cutting Machines-aand total phosphorus concentrations.

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Table 2pH, Turbidity, absorbance at UV 254 nm, total phosphorus (TP) and chlorophyll-aconcentrations in raw water used for jar tests.

ReservoirpHTurbidity (NTU)UV254TP (µg L-1)Chl-a (µg L-1)
Cruzeta7.9511.80.263127.0018.82
Timbaúba6.8521.40.32789.5027.30
Dourados7.3520.80.402153.6739.93
Boqueirão8.4324.20.26462.0046.10
Passagem das Traíras8.4635.00.509163.7589.79
Gargalheiras8.6615.50.401189.5090.83
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3.2. PAC performance

The pH decreased as PAC dose increased with the coagulant application but final pH was always above 6.5 (data not shown). In general, the removal efficiency increased sharphly from dose 0 to 4 mg Al.L-1, achieving higher values between the dose 4 to 6 mg Al.L-1for all variables (2018 Newest Camping Hiking Bug Net Hammock). Then, two situations were observed: the increasing in the dose did not cause an increasing in the efficiency for total phosphorus, chlorophyll-aand turbidity removal; or the efficiency increased continuously with the increasing of the Al dose for UV254Anti-Aging Dredger UHMWPE/HDPE Sand Mud Oil Dredge Floater Pipe Pipeline%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (UL Ce LED Bullet Floodlight Lighting Fixture). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (Ceramic Id33 Transponder Chipd).

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Figure 1Removal efficiency (%) for total phosphorus (TP), turbidity, humic substances (UV254) and chlorophyll-a (Chl-a) in raw water from Dourados (DOU), Timbaúba (TIM), Boqueirão (BOQ), Cruzeta (CRU), Gargalheiras (GAR) and Passagem das Traíras (PT) reservoirs, after coagulation-flocculation with different concentrations of aluminium (0, 2, 4, 6, 8 and 10 mg Al L-1) and 30 minutes of sedimentation.

For most reservoirs, the minimal dose required to reduce in at least 50% the concentrations of the variables was 4 mg Al.L-1(Shiny Bamboo Joint Polyester Stretch Satin Fabric). This dose resulted in turbidity values ≤ 10 NTU, total phosphorus concentration ≤ 50 µg.L-1and chlorophyll-aconcentration ≤ 15 µg.L-1for Cruzeta, Timabúba e Dourados reservoirs. Boqueirão reservoir water achieved a turbidity of 10.3 NTU and had total phophorus concentration reduced to values below 50 µg L-1but clorophyll-aconcentration remained above 15 µg.L-1. The total phosphorus, turbidity and UV254removal efficiency for dose of 4 mg Al.L-1was significantly negatively correlated with the initial chlorophyll-aconcentration and pH (New High Cube Grain Loading 20FT Intermediate Dry Bulk Container). The highest total phosphorus and turbidity removal were observed for chlorophyll-aconcentration range of 18.8-39.9 µg.L-1and pH range of 6.8-7.9. The highest UV254removal was observed for the same pH range but for even lower chlorophyll-aconcentration (18.8-27.3 µg.L-1).

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Figure 2Removal efficiency (%) for total phosphorus (TP), turbidity (TURB), humic substances (UV254) and chlorophyll-a (Chl-a) in raw water from Dourados (DOU), Timbaúba (TIM), Boqueirão (BOQ), Cruzeta (CRU), Gargalheiras (GAR) and Passagem das Traíras (PT) reservoirs, after coagulation-flocculation with the dose of 4 mg Al L-1and 30 minutes of sedimentation.

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Figure 3Correlations between chlorophyll-aconcentration and pH with total phosphorus (TP), turbidity and UV254removal efficiency (%) based on the dose of 4 mg Al L-1.

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4. Discussion

In general,Continuous Inkjet Printer for Plastic Pipe Printing (EC-JET1000), but its efficiency was affected by chlorophyll-aand humic substances concentration. We suggested that 4 mg Al.L-1is the best dose (better cost-benefit) to be applied in most of reservoirs tested. This dose changed the trophic state of water from eutrophic to oligo-mesotrophic conditions in Cruzeta, Timabúba e Dourados reservoirs and had intermediary effects on Boqueirão water in laboratory tests. The efficiency in total phosphorus removal is reported for in-lake PAC application (Multi-Viewing Biological Microscope with Good Price;Chc-B07 Health Stainless Steel Germanium Bracelet for Female;Best Quality Plastic Access Panels Ap7611;Best Price Led Helium Ballons). However,Amusement Park Outdoor Water Park Slide Boat Playground for Sale.

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In summary we consider PAC application a good restoration technique for Cruzeta, Timbaúba and Dourados reservoirs.Industrial Chemicals HPMC Products, Hydroxypropyl Methyl Cellulose for Tile Adhesive.

Acknowledgements

We thank the participants of the MEVEMUC/FINEP and ESEC/CNPq projects for the provision of water from the reservoirs to the jar tests.

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References

Supply12HP Copeland Scroll Air Conditioner Compressor Zr144kce-Tfd-522 for Sale, F., BECKER, V. and ATTAYDE, J.L. Shallow lake restoration and water quality management by the combined effects of polyaluminium chloride addition and benthivorous fish removal: a field mesocosm experiment.Hydrobiologia, 2016, 778(1), 243-252. http://dx.doi.org/10.1007/s10750-015-2606-5. [Magic Smart Bluetooth Illuminated Mirror Bathroom LED Mirror with Clock Display]

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