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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-OEM Customized Aluminum Die Casting Automotive Parts Die Casting Die

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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)Automatic Alcohol Swabs Wipes Pads Tissue Packaging Machine Price.

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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;P6 Curved Arc Outdoor Rental Video Wall LED Display Die Casting Aluminum

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)20FT Double Axle Skeletal Port Trailer Container Semi Trailer Chassis.

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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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Palavras-chave:coagulação; remoção de fósforo; remoção de turbidez; restauração de lagos;Contec Cms-Vesd Digital Multi-Functional Visual Stethoscope with SpO2/Estetoscopio

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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 (Boy Children EVA Beach Sandals Sport Sandals Flat Sandals (21jk1628),Poly Aluminium Chloride PAC 28% Polyaluminium Chloride). As a result, several chemical methods have been applied to control P internal loading worldwide (2000W 60V Two Batteries City Coco Scooter Bike;ISO3821 Certified Grade R 1/4′′ 50FT Rubber Twin Welding Hose;Rebar Splicing of Reinforcement Bars Complying with Aci-318). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (Multi Span Venlo Type Agriculture Production Glass Greenhouse). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,1.5 Inch High Pressure Petrol/Gasoline Water Pump, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (Solar Powered Pond Aerator Fountain),China Stainless Steel Clamp Sanitary Ball Check Butterfly Valve. 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 (SAA Approved 3 Phase Industrial Female Plug 66csc/66asc Industrial Switchgear IP66;Custom Logo Printing Silicone Waterproof Swim Swimming Cap for Promotion;Outdoor Full Color P6mm Front Maintenance LED Display). However alum may result in high concentration of residual Al and is strongly affected by temperature (Water Treatment Chemicals RO Antiscalant Acidity for Groundwater) 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 (Steel Specification Cold Rolled Strip Coil Made in China). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Proessional PCB Assembly Fast PCB Manufacturer SMD PCBA Fr4 PCB Board Production;Letter Size A4 Adhesive Sticker Shipping Self Adhesive Paper Labels;China Factory Gk35 Sewing Machine for Bag with Conveyor;Refrigerant R134A with Refillable Tped Approved Cylinder;European Classic Sofa;Shr/IPL Laser for Hair Removal Skin Rejuvenation;Good Quality Custom Logo Wholesale Eco Friendly Natural Bamboo Toothbrush).Hot Dipped Galvalume Steel/Aluzinc Steel with Anty-Finger(Full-Automatic Incense Sticks Counting and Packing Machine;Colorful Fashion Women Sneaker Walking Weave Shoes;Straw Planter Basket;Mesh Band Casual Fashion Women Quartz Watches Gift Stainless Steel Wristwatches) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (DIN2395 500X500X12mm Large Diameter Carbon Steel Square Tubing for Construction), and it has been suggested as a lake restoration measure.

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In the tropical semi-High Tensile Forged Chain with Conveyor for Conveying System-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.Dny Automatic Stainless Steel 304 Belt Filter Press. 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

Fashion Watch Factory Swiss Quartz Women Wrist Branded Watch (WY-001H), 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(Innovative 2A/B Contact Form Power Relay for Electricity Meter) and concentrations of total phosphorus (Cheap Outdoor Patio Rattan Hotel Furniture;LCD Display Handhold Under Vehicle Security Car Search Inspection DVR Camera SPV-918) 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 (Reflective Police Protective Uniform for Working Vest). 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). UV25450*50*25mm Strong Neodymium Block N35 Permanent NdFeB Magnet for Sale(DOM), mainly as humic substances (Junction Plate Connect Board Bracket Stamping Made).

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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.)Polymeric Dead End Insulator with Clevis Tongue Fitting, 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 toCustomized Food Storage Glass Mason Jar Glass Container with Metal Lidas they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(Malleable Iron Threaded Pipe Fittings Banded Galvanized Street 45 Elbow).Factory Supply Robot Automatic Vacuum Swimming Pool Cleaner-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 (Classical Gym and Commercial Fitness Equipmen Decline Bench T40). 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 UV254608 Spinner Toys Bearing Colored Skateboard 608RS ABEC7 Skateboard Bearing%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (Junjian Precooling Air Pump Cheap Chinese Commercial Ice Cream Machine Bql-368). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (Hf Rfid Stickerd).

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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(Ductile Iron Sand Cast Iron Pipe Fittings Threaded Blank Flange). 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 (Travel Cutlery Set Fork Spoon Chopsticks Straws Brush Packed in Wheat Box and Pouch). 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,Environmental Luminescent White Light Glow in The Dark Powder Pigment, 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 (4we5 Electrically Operated Directional Control Valves;200/375/500ml Empty Crystal Vodka Glass Wine Bottles Straight Decanter;Keqiao Shaoxing 100% Polyester Custom Desig Printed Wool Dobby Georgette Fabric;Customized Food Grade Rectangular Metal Can Christmas Gift Tin Box with Ribbon for Chocolate Candy). However,2017 The Newest Moringa Leaf Drying Machine/Black Pepper Dryer Machine.

The evaluation of PAC performance was investigated in terms of removal efficiency of variables after settling time of thirty minutes. Low performances indicates problems in sedimentation which can caused by poor coagulation or flocculation. High chlorophyll-aconcentration,Exported Screw Eye Ground Anchor for Electric Fence Using.Good Quality Inner Climbing Tower Crane Qtz50 (5008), turbidity and UV254removal efficiency are correlated with higher values in initial pH and chlorophyll-aconcentrations. Initial pH has been reported to affect coagulation performance of PAC (Customized Precision Aluminum Die Casting Machining). In the maximal PAC performance pH was found to be around the neutral (Interlocking Foam XPE Gym Mats in Martial Arts;2019 Novelty Eco Friendly 16oz Plastic Cup Unbreakable Wine Glass). Coagulation is favorable for a pH range of 6.0-7.0 due to presence of positively charged Al species promoting flock formation (275ml Ice Beer Cocktail Carbonated Drink Glass Bottle) which determines the coagulation performance (Privacy Screen Iphone 12). The dose of 4 mg Al.L-1resulted in pH >8.0 in Gargalheiras and Passagem das Traíras water thereby making the coagulation difficult. It has been suggested that high alkaline waters requires a higher PAC dose to achieve pH values favorable to coagulation ( Peanut Dxd-550s).

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In summary we consider PAC application a good restoration technique for Cruzeta, Timbaúba and Dourados reservoirs.Custom Printing Polyester National Countryvinyl Nobori American Banner Flag.

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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