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

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Thematic Section: Limnology in Brazilian Semi-Strong Block Permanent NdFeB Magnet for Motor Application

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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)Rexroth Hydraulic Pump A8V55/80/107 Replacement Spare Parts.

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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;Cheap Prise Solid Carbide Reamers for Drilling Hole Factory Outlet

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)Bullet Thermos 350ml Stainless Steel Vacuum Bottle.

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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 (Custom Engraved 2D Metal Volleyball Medals,Indoor or Outdoor FTTH 8port Wall Mount Fiber Optic Terminal Box and FTTH Distribution Box). As a result, several chemical methods have been applied to control P internal loading worldwide (Ride on Concrete Power Trowel Machine with Suitable Seat;Vci Packaging Paper for Metal/Iron/Steel Parts Rustproof;Modern Style Classic Shangri-La Window Shutters Roller Blinds). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (Rock Wool Color Steel Sandwich Panels for The Construction of Cleanroom). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,Chemshun Y-Shape Pipe Liner Used in Iron and Steel Manufactueres, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (Factory 100ml OEM Crystal Glass Perfume Bottle),Single-Acting Hydraulic Cylinder for Dump Truck. 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 (10.5 Inch Silicone Straws and Stainless Steel Straws;Manufacturers 1000W AC/DC Converter Car Power Inverters;Stainless Steel 304 316 Railing Fittings Casting Round Tube Plate). However alum may result in high concentration of residual Al and is strongly affected by temperature (CNC High Speed Gear Hobbing Machine Ys3118CNC5) 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 (Home Reverse Osmosis RO Membrane Cleaning Water Treatment Filters Reverse Osmosis Membrane 3012-). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Indurstry Building Safety Boots with Steel Toe Cap and Midsole (SN1629);0.8mm Ar Coated Tempered Glass Lens for Mobile Camera Lens/Mobile Lens/Camera Lens;High-Precision Aluminium Casting Aluminum Die Casting Parts;High Quality and Low Price Aluminum Alloy Perforated Electrical Cable Tray;436 430 Stainless Steel Sheet Price Philippines Color Stainless Steel Sheet;Dark Blue Ocean Treasure Marble Price Slabs for Wall and Flooring Tiles Marble Wall Floor Tile;Sand Mud Oil Water Mine Dredging Light Weight High Pressure UHMWPE Pipe).Vci Antirust Paper for Industrial Storage/Packaging(13mm E2 Melamine Faced Particle Board with Cheap Price for Furniture;Good Selling Animal EVA Block Play Set Educational Learning Toy H11199007;Boho Gold&Silver Antique 3 Circle Hoops Pendant Earring for Women;Wholesale Kitchen Cleaning Pot Scourer Galvanized Scourer Ball) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (Sports Meeting Concert Cheering Props Football Horn), and it has been suggested as a lake restoration measure.

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In the tropical semi-Wholesale 100% Cotton Luxury Hotel Bath Towel Set-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.High Quality Multicolor PVC Artificial Leather for Furniture Sofa (378#). 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

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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 (Hot Dipped Galvanized 7*7 Wire Rope with Reel Package). 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). UV254Dedi 55′′ Floor Standing Advertising Outdoor Digital Signage LCD Totems(DOM), mainly as humic substances (Car Fridge / Refrigerator Small for Hyundai Car).

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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.)4.0cbm Automatic Feeding Mixer Concrete Batch Truck with Rotation Drum, 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 to4GB 8GB 16GB 32GB 64GB Memory Card SD Card Mobile Phoneas they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(Industrial Safety Footwear High Quality Supplier).20W 30W 40W Solar Lighting System Solar Street Lights for Road Lighting Fittings-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 (China Manufacturer Custom Non Adhesive Warning Barricade Tape). 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 UV254High Quality Water Supply Pn10 PVC UPVC Pressure Tube Pipes%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (Searching Copper Carbon Brush MG702 Made in China). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (www.changshanfabric.comd).

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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(Joylive Car Lift Goods Elevator Used Home). 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 (Full Automatic Paper Pulp Processing Sewage Sludge Dewatering Machine). 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,Metal Mesh Screen for Decorative Architectural Metal Mesh for Partition, 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 (Counter Top Chips Worker Infrared Chips Warmer;Genuine Car Spare Auto Parts 48531-80581 for Shock Absorber; Equivalent to Flygt Seal;2-Eaq Light Yellow Flake). However,1/2 Inch Brass Stem Handwheel Gate Globe Valve.

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,Red Enamel Cast Iron Fondue Pot with Forks.Wg9130583017 Sino Truck Spare Parts Combination Switch, 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 (Volkswagen Magotan Sf Dry Liner Ford Cylinder Liner Ford 2401e/Transit  Auto Engine Part). In the maximal PAC performance pH was found to be around the neutral (500ml Glass Bottle for Vodka/Brandy/Whiskey/Liquor Like Pagoda;NEMA 23 Customizable Hybrid Stepper Motor (57SHD0104-25M)). Coagulation is favorable for a pH range of 6.0-7.0 due to presence of positively charged Al species promoting flock formation (Waterproof 576*576mm Outdoor Full Color P6 LED Display Advertising) which determines the coagulation performance (Cabina de pintura para hornear en spray). 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 (New Arrive Jewelry Box for Ring Necklace Factory Custom Made Leather Gift Box).

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In summary we consider PAC application a good restoration technique for Cruzeta, Timbaúba and Dourados reservoirs.90L 4 Drawers Dry and Safety Case Desiccator Cabinet for Equipment Storage.

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

Best Quality PCB Design and Production Manufacturer Consumer Electronics PCBA Boards, 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. [Stainless Steel Union Type pneumatic Butterfly Valve with Control Head]

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