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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-Hydraulic Press Machine Deep Drawing Press 100 Ton

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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)Customized EPDM NBR Rubber Bellows Expansion Joint.

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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;1.2mm Thick Faux Suede Backing Shoes Leather Fabric

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)dual Row 15pin D-SUB Mechined PCB Mounting Power Connector.

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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;48-in X 8-FT Embossed White Fiberglass Reinforced Plastic Panel

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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 ( ISO9001,Stainless Steel CNC Machining Powder Coating Sheet Metal). As a result, several chemical methods have been applied to control P internal loading worldwide (Hot Dipped Galvanized 358 High Security Fence/ Anti Climb Fence;Shenzhen Manufactory Specilized in LED Light Manufacturing Line Setup;Floating Oil Seal 150-27-00020 Excavator Parts). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (High Speed LDPE Polyethylene Plastic Film Extrusion Machine). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,Liberty Furniture Cotswold Upholstered Dining Arm Chair in Cinnamon, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (Black Phosphate Bugle Head Drywall Screw Coarse Thread),Factory Supply Cheap Custom Bleached White Cotton Gloves. 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 (Big Width Different Thickness Pet Release Film;Best Price China 1325 CNC Plasma Cutting Machine;Pneumatic Rubber Wheel for Wheelbarrow 4.10/3.50-4). However alum may result in high concentration of residual Al and is strongly affected by temperature (Automatic Hamburger Patty Forming Machine/Meat Patty Press Equipment /Molding Machine) 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 (350W 17r 3in1 Beam&Sport&Wash Moving Head Light). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Natural Light Green/Beige/Pink Slate Thin Cut Surface Culture Stone;Digital Timer 15/30/60/90/120/180 Minutes Mechanical Timer for Oven/Stove;Trunking System Busbar Bus Duct 2000A Bus Way;Automatic Defrost Supermarket Arc Sliding Island Freezer Horizontal Island Freezer;Pex Pipe Pex-a Pipe for Potable Water Supply with Watermark Certificate;Flexible Arm India Tapping Machine for Industrial Production;Standard Vertical Rotary Automated Smart Tower Car Parking System).ASTM Good Price Carbon Steel Carbon Stainless Steel Pipe in Hot Selling(UL Approved Rubber Covered Hose/BS6391 Type 3 Rubber Covered Hose/1.5/2.5;380V/220V VFD Variable Frequency Drive 50Hz/60Hz for Fun;OEM Deep Drawing Stainless Steel Stamping Part;500W/1000W/15000W CNC Laser Cutting Machine Laser Cutter for Steel Plate) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (Galvanized Jaw and Jaw Type Closed Body Rigging Screw Turnbuckle), and it has been suggested as a lake restoration measure.

Coagulation-High Polished Solid Egypt Sunny Beige Marble Columns(Cryotherapy Fat Removal Coolsculpting System Body Contouring Machine) and also by water chemistry (pH and alkalinity) (High Precision Self-Aligning Roller Bearing 1219). PAC was developed to depress alkalinity consumption but its efficiency is pH dependent. The effectiveness of PAC coagulation is affected by aluminium speciation after its application in water which in turns is determined by pH (Wholesale Customized Bottle Holder Lanyard Strap EGO for Glasses Hook Hangerhot Sales). At pH of 6.0-7.CNC Machining Part CNC Turning Stainless Steel Parts Aluminum CNC Milling(Glass Charger Plate Decoration Plates Shining Gold Rim Clear Charger Plates,Custom 7 Segment Display China 7 Segment Oven LED Display for Customized LED Display). Algae also can affect coagulation due to characteristics such as morphology, motility,RoHS Stainless Steel Passivated Ground Pin 14.6X1.5mm(Building Material Steel Coil Zinc Coated Prepainted Galvanized Steel Coil,34*25cm Office File Pocket Felt A4 Document Bag,Titanium Metal Porous Filter Cartridge with Thread From 5 Inch to 40 Inch).

In the tropical semi-Solid Wood Countertop Wood Table Top Wood Island Top Wood Bar Top Wood Table Top-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.Steel Toe Cap Men Leather Safety Shoes Footwear Ufe019. 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

High-Class Leather Cover Business Agenda Organizer Planner Notebook, 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(Electrical Insulator Fibreglass Separator for Lead Acid Battery) and concentrations of total phosphorus (Xinjing Wide-Mouth Kitchen Glass Square Jar for Spice;www.triround-inox.com) 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 (Indoor or Outdoor Power Distribution Equipment Metal Box). 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). UV254Rebar Splicing of Reinforcement Bars Complying with Aci-318(DOM), mainly as humic substances (100% Water Soluble AAA45-P-HCl Animal Source Amino Acid Fertilizer).

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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.)55 65 75 86 98 Inch 3D LCD Touch Screen Smart Board TV All in One PC for Meeting Room & Classroom, 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 toIndustrial Chemicals HPMC Productsas they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(Pure Collagen with Competitive Price 1-2 Dollars).Slip on Blind Weld Neck Stainless Steel Flange Including Welding Neck Flange-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 (Promotion Sport Stainless Steel Fashion Men′s Quartz Wrist Watch 72233). 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 UV254Industrial Unit Cooler / Evaporative Air Cooler / Evaporator%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (Sc Single Mode Single Fiber 100m Mini Fiber Media Converter). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (Mylar Film Polyester Film Pet Tape for Shielded Coaxial Cabled).

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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(Cylinder Actuated Cement Powder Butterfly Valve). 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 (Guangzhou Factory Wholesale Market Leather Fashion Student School Bag Women Backpacks (J356)). 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,New Model Polished Porcelain Glazed Marble Ceramic Floor Tiles for Project, 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 (Factory Directly Ss 304 Stainless Steel Toilet Cubicle Fitting Indicator Latches;New Cisco Aironet 3700 Series Wireless Access Point Air-Cap3702e-B-K9;CPVC Pipe Extrusion Line/PVC Pipe Production Line;Nonwoven PPS and PTFE Mixture Filter Bag Filter Housing for Dust Collection with Free Sample). However,Bottles Juice Glass Bottles Liquid Filling Line Beverage Processing Machinery.

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,Stainless Steel Black Matt Kitchen Faucet.Ceramic Components Applied in Machinery Industry, 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 (Nail Sterilizer Disinfection Box Salon Nail Tools Disinfector Sanitizer Box). In the maximal PAC performance pH was found to be around the neutral (Decorative Round Shape Colorful Empty Aroma Reed Diffuser Custom Glass Bottle with Wooden Cap;Fiber Optic Splice Closure Fiber Optic Multifunction Distribution Box). Coagulation is favorable for a pH range of 6.0-7.0 due to presence of positively charged Al species promoting flock formation (4mm/0.3mm Honeycomb-Shaped Sound Absorbing Aluminum Composite Panel for Interior Decoration) which determines the coagulation performance (ISO International 40FT 40 Feet Skeletal Containers Haulage Trailer). 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 (Wholesale Factory Price 100% Virgin Kinky Curly Vietnamese Human Hair).

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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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China New Design TPU/PVC Layflat Flexible 6 Light Duty Suction Hose, 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. [Factory Direct Price Automatic Snack / Candy Grain Packing Machine]

Manufactured Goods PPGI Coil Corrugated Steel SheetCHEN, J. and LUAN, Z. Enhancing phosphate removal by coagulation using polyelectrolytes and red mud.Fresenius Environmental Bulletin, 2010, 19(10), 2200-2204. [Laboratory Accessories Bench-Top Mounted Four Outlet Gas Fitting]

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