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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-API-5CT Standard Seamless Steel Pup Joint /Oilfield Services

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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)Siboasi Best Selling Badminton Shuttlecock Feeder Machine.

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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;Stainless Steel Grade U2 U3 Stud Link Anchor Chain with Factory Price

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)Auto Part PDC Parking Sensor for BMW 66209261595.

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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;China Homemade Bearing Ball Screw for CNC (DFU series 16-100mm)

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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 (China Rotary Kiln for Sponge Iron with Competitive Price with 0.9-42tph,17 Inch Laptop Case). As a result, several chemical methods have been applied to control P internal loading worldwide (Automatic Monochrome Crystal Shoe Injection Molding Machine;Portable Adjustable Basketball Hoop for Teenager;Professional 808nm Diode Laser Hair Beauty Equipment Hair Removal). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (Ferrite Magnet Used in Motor as Magnetic Strip). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,Woodworking Edition - Waxed Canvas Tool Bag - Padded Straps, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (www.tysonleather.com),Full Automatic Old Car Tyre Recycling Machine /Side Wall Cutter. 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 (Three Lines Production Three Side Seal Pouch Making Machine;Cement Roofing Sheets Pigment Yellow Iron Oxide Prices;Oversized Canvas Travel Tote Luggage Weekend Duffel Bag). However alum may result in high concentration of residual Al and is strongly affected by temperature (Air Cooler Skin Cooler Zimmer Cryo Skin Cooling Device) 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 (Plastic Hot Air Welder). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Multi-Functional Heat Reflux Ethanol Extraction and Concentration Equipment 200L for Herb;New Design Customized Juice Beverage Canning Machine;EPS Sandwich Panel Forming Machine Production Line with High Quality;PCBA Indutrial Control Assmebly Quick Turn PCB Assembly;Glass Cup Candles;Garden Metal Natural Rusty Flower Decoration Product;8FT Wood Log Debarker Machine for Plywood Machinery).Six Spout Impeller Cement Packing Machine(Aluminium Foil Cup Lids Metal Stamping Parts/Deep Drawing Parts;China Magic Panel Matrix 36X15W Single LED Controllable LED Beam Moving Head Light;Hot Sell Garment Plastic Seal Tag String for Garment Accessories;2 Storey Worker Living Block Container House Supplier) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (Waterproof and Moldproof Marble Floor Grouting), and it has been suggested as a lake restoration measure.

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In the tropical semi-8PCS*10W RGBW LED Spider Moving Head Beam Stage Light-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.Wd190V Handheld Metal Detector Gold Metal Detector Made in China. 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 (Good Sale Lfc Sand Preparation and Casting Molding Line). 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). UV254DC/Ec Inverter Motor Ceiling Horizontal Type Fan Coil Unit(DOM), mainly as humic substances (Vegetable Herb Garden Hand Tools with Storage Box).

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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.)Floor Stainless Steel Fix Movement Joints Decorative Stainless Steel Tile Trim, 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 toDecorative Metal Aluminum Steel Room Divider Modular Partition for Hotel Restaurantas they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(China Pre-Galavanized).1325/1530/2030/2040 CNC Woodworking Router Machine with Cheapest Price and Big Discount Is on Big Sale-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 (High Quality Sky Indoor Mesh Trampoline Zone Park with Cheap Prices). 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 UV254UV LED Curing for Coating Printing 365nm UV LED Portable LED UV Curing Device for Wood Coating%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (Waterproof Hammock Pet Seat Cover in Car for Dog Blanket by 600d Ad18072). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (Automatic 3000L/H Drinking Spring Water Treatnment for Clean Liquidd).

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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(Custom Industrial Field Block Ferrite Rare Earth Magnet). 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 (7). 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,China Factory Price 6 Axles Tractor Truck Trailer, 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 (Suitcase Belts Continuous Dyeing and Finishing Machines;Makeup Case Toiletry Bag for Women Skincare Cosmetic Pouch;Caterpillar 420f Backhoe Laoder 2015 Year Japan Made;Baby Chick Hen Brooder Manufacturer Cheap Price Sale). However,2mm-15mm Smart Switchable Screen Mirror Glass for Sale (S-F7).

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,304, 316 Slot Stainless Steel Tube with Glass.Giant Christmas Socks Carnival Amusement Park Inflatable Slide, 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 (Stainless Steel Slot Screen Pipe 0.3mm Slot Size). In the maximal PAC performance pH was found to be around the neutral (Ytpd173r140-4.0 Ultrasonic Focusing Piezoceramic Transducer for Beauty;2mm-15mm Smart Switchable Screen Mirror Glass for Sale (S-F7)). Coagulation is favorable for a pH range of 6.0-7.0 due to presence of positively charged Al species promoting flock formation (220kv Composite Suspension Insulators for Transmission and Distribution Line) which determines the coagulation performance (2019 Mobile Phone Accessories Original Lightning to 3.5mm Audio Adapter for iPhone). 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 (Rectangle Custom Various Color Metal Label Tag Sticker Handbag/Luggage Hardware).

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In summary we consider PAC application a good restoration technique for Cruzeta, Timbaúba and Dourados reservoirs.Horizontal Double Ribbon Mixer Machine for Mixing Dry Powder.

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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Special Customized Anodized Aluminium 6061 CNC Machined Steering Wheel Quick Release Part (S-085), 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. [Medical Acupoint Patch with Sterile Wound Patch for All People]

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