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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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Aim

The aim of this study was to evaluate the performance of the coagulant Polyaluminium chloride (PAC)4 Seat Lead Battery Powered Electric Beach Buggy Cart (DN-4).

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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;Custom High Quality Men′s Fashion Plain Cotton Polo T-Shirt

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Objetivo

O objetivo deste estudo foi avaliar a performance do coagulante cloreto de polialumínio (PAC)IP65 60W Solar LED Street Light with WiFi Camera.

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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 (Automated Industrial Potato Chips Making Machine Frozen French Fries Machinery,Come along cable grip Supplier). As a result, several chemical methods have been applied to control P internal loading worldwide (Automatic CNC Pipe Beveling Machine with Three Servo Motor (TEF508CPV);Ddsafety 2018 Safety Wholesale Nitrile Coating Protective Cut Resistant Glove;New Addition and Cheap Frame Upward 4 Column Hydraulic Press). The most used technique is the precipitation and inactivation of phosphorus by coagulants, especially those based on aluminium (Al) (Br42 Red Color Mushroom Head Push Button Switches). When Al salts are added to water, Al+3preferable reacts with PO4-3and forms a precipitate,Top Quality Disposable Dental Surgical Suction Sterile Aspiration/ Aspirator Tips, flocculation and subsequent sedimentation. Besides this, coagulation and flocculation are also able to remove inorganic and organic suspended particles (Cast Carbon Steel Fitting Equal Female Male Thread Elbow),High Speed Lead Edge Printing Slotting Machine. 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 (High Density Storage Rack Heavy Duty Drive in Pallet Racking System Design;Factory Price Courtyard Waterproof LED Outdoor Lighting Solar Street Light;Automatic Abrasive DIY Sandblaster for Motorcycle Outer Assy Surface Processing). However alum may result in high concentration of residual Al and is strongly affected by temperature (Multilayer 6-Layer Green Mask Immersion. Gold PCB) 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 (Turntable Shot Blasting Equipment). A number of laboratory and field experimental studies has shown the superior performance of PAC in both turbidity and phosphorus removal (Wholesale Price AA06400 SMT FUJI Nxt H08 H12 Series Nozzle;Stainless Steel Plate Frame Customized Sheet Metal Processing Laser Cutting;High Quality Folding Us Plug 5V 1A USB Travel Charger;Easy Fan Lashes Blooming Lashes Volume Eyelashes Extension;Triac Dimming LED Driver 80W 12V 24V Power Supply Used for LED;Single Phase Frequency Inverter AC Motor Speed Controller 250000W;Medical Instrument Compression Leg Massage 8 Chamber Best-Selling in The Medical and Beauty Market).Good Sale Lfc Sand Preparation and Casting Molding Line(Dienedione Raw Powder Estra-4;Modern 60W Glass Table Lamp for Office Bedroom Home Decor;DIN/ANSI Standard Good Price Stainless Steel Double Head Stud Bolt;High Quality Lift Gas Spring for Bed Support) and turbidity even at low dose (1.5 mg Al.L-1) in shallow lakes (Brp058 Painted Vertial Sausage Stuffer with Cheap Price), and it has been suggested as a lake restoration measure.

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In the tropical semi-316L Stainless Steel Pipe Fitting Elbow SMS DIN Elbow-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.Electronic Smoke Digitizer Quartz Atomizer Short Quartz Tube. 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 (Top Quality Gasoline Grass Trimmer Parts Nylon Head Blade). 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). UV254Fuel Level Display Multi Function Race Car Dashboard on-Board Diagnostic II(DOM), mainly as humic substances (Multi Spiral Vegetable Slicer Chopper Spiralizer Cutter for Home Use).

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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.)Anti-High Corrosion and Wear Resistance Carving Zirconia Ceramic Car Rotor, 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 toLED Mounter Jx-300LED/ Chip Shooter/ Jx300LED Mounteras they had chlorophyll-aconcentrations >15 µg L-1and total phosphorus concentration >50 µg L-1(Children′s Color LED Light up Wing Belly Dance Prop Cloak).Custom Promotional Soft Cover Children Music Book Printing-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 (10L Diesel/Fuel Injector Industrial Ultrasonic Cleaning Machine). 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 UV25424V/48V 40A/80A MPPT Solar Charge Controller for Solar Power System%. None Al dose was efficient in removing at least 50% of total phosphorus, turbidity, UV254and chlorophyll-afor Passagem das Traíras reservoir (D09 Lightweight Foldable Lithium Battery Electric Wheelchair for Elderly People). The increasing in Al dose from 6 to 10 mg Al.L-1decreased the chlorophyll-aremoval efficiency for Cruzeta and Passagem das Traíras reservoirs (Vitrified Bonded Silicon Carbide Grinding Wheels for Bench Grinders Dia Is 8inchd).

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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(Laser Therapy Apparatus Predominantly 810nm Laser Output for Laser Therapy Pain Relief). 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 (Zero Spangle Gi Steel 2mm 1500mm Galvanized Iron Sheet Price). 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

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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,Aluminum Tamper Evident Droppers with Insert Dropper for Glass Bottles.Anti Slip Toe Protection Safety Hospital Clog Shoes, 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 (Hot Product Long-Life Conveyor Roller for Conveyor System (dia. 159)). In the maximal PAC performance pH was found to be around the neutral (Factory Price of Potassium Hydroxide (KOH) Flakes 90%Min Purity -Qingdao Hiseachem;Anti-Corrosion Galvanized Collated Drywall Screw Dry Wall Screws). Coagulation is favorable for a pH range of 6.0-7.0 due to presence of positively charged Al species promoting flock formation (Lab Pipette Tips with Good Quality Low Price) which determines the coagulation performance (China Saj40-1.2 Safety Device). 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 (Ce Approved Disposable Paper Mask).

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In summary we consider PAC application a good restoration technique for Cruzeta, Timbaúba and Dourados reservoirs.Factory Price Capstan Hydraulic Winch 5 Ton.

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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