Progen Scientific can supply the Velp range of Environmental equipment for the analysis of drinking and waste waters.
Environmental deteriorations due to human activities require an ever increasing number of analytical tests to control their evolution and to state which kind of intervention is needed to restore acceptable conditions. In particular, the quality of water, a fundamental need for life, asks for a systematic survey.
Velp Scientifica manufactures environmental equipment which facilitates the analytical work, providing accurate and reproducible results, which falls into the following categories:
- Thermoreactors for C.O.D
- BOD Test Equipment
- Refrigerated incubators
- Flocculators / Jar Test
- Rotax Overhead Mixer
- Glassware for extraction of heavy metals
- Turbidity Meter
- Radiation Detector
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Chemical Oxygen Demand (C.O.D.) means the amount of oxygen from chemical oxidants required for the complete oxidation of substances dissolved or suspended in water. By C.O.D. determination it is possible to quantitatively evaluate substances which can be oxidised by strong oxidants like potassium dichromate in highly acidic solutions by concentrated sulphuric acid. Both organic and inorganic substances can be oxidised.
The COD analysis environmental equipment allows the determination of substances which are not oxidised by the corresponding biological method (B.O.D. = Biological Oxygen Demand), for example cellulose.
Chemical oxidation is more complete than biological oxidation and therefore C.O.D. values for a given sample are generally higher than B.O.D. values.
Thermoreactors for C.O.D.
Programmable and preset thermoreactors (heating blocks) for applications such as C.O.D. tests
Features and benefits:
- Microprocessor control allows different settings of temperature and heating time to satisfy different demands
- The 3 thermoreactors are (up to 150oC) able to accept a range of 8, 16 or 25 small test tubes. The ECO 6 (up to 200oC) can accommodate 6 x C.O.D. test tubes 42 mm. dia. x 200 mm., 200 ml. with cone SN 29/32
- Excellent temperature uniformity
- Auto shut off
- Test tube diameters of 16 or 22 mm.
- Heating power - 140, 270, 550 or 70W depending on size of unit
- Selectable temperatures: 70oC, 100oC, 120oC and 150oC preset or over the full range to 150oC or 200oC depending on the unit
- Selectable times: 30, 60 or120 minutes or continuous for 2 models; variable up to 199 minutes or continuous for other 2 models
- Acoustic signal at the end of the cycle with auto switch off on all models
- LCD display on 2 models; preset value choices on other 2 models
- Accessories - a comprehensive range of accessories are available for safety and operator convenience
According to methods: EPA, APHA, AWWA, WEF for ECO 6
B.O.D. (Biochemical Oxygen Demand) measures the amount of oxygen consumed by micro-organisms in decomposing organic matter in wastewater or stream water. The micro-organisms in, or inoculated on purpose into, a sample of water containing a biodegradeable organic substance, consume oxygen owing to their metabolic activity and generate a corresponding volume of carbon dioxide.
If we work in an enclosed system and make the carbon dioxide produced by a highly alkaline substance become absorbed, we will get a progressive reduction of the gas pressure that can be measured by appropriate manometers.
Today, conventional incubation time at 20oC is considered to be 5 days, and the B.O.D. value obtained is called BOD 5 . This corresponds with good reproducibility considering all of the technique's aspects at 70% of what is called BOD last , which is the complete oxidation value that results in 21 - 28 days.
Instruments for B.O.D. Analysis
- B.O.D. Sensor (mercury free)
Velp Scientifica has developed environmental equipment for the innovative, ecological system in determining B.O.D. with microprocessor utilising manometric technology. The B.O.D. Sensor instrument fits directly on the bottle containing the sample. A microprocessor controlled pressure transducer transfers the B.O.D. measurement value onto the display. It automatically stores 5 B.O.D. measurements at 24 hour intervals so that the analyses can also be performed over weekends. It is possible to carry out the direct reading of the B.O.D. value on the display ay any time, even after 5 days. The B.O.D. sensor does not require any electrical connection.
The BOD Sensor System 6 and System 10 consist of a 6 or 10 position stirring unit complete with 6 or 10 B.O.D. Sensor Sets. Each Sensor Set comprises: a 500 ml. bottle, an alkali holder to absorb the carbon dioxide and a stirring bar. The two built-in handles on the stirring units make inserting and removing the systems from the refrigerated incubator easy, even with the bottles already in place. The stirring system offers non-stop operation without risks of interruption or overheating. Optional accessories include a B.O.D. Sensor Check and Control Test Tablets.
- Traditional B.O.D. Analysis
Velp Scientifica also manufacture the traditional manometric (mercury) technique. The environmental equipment can simultaneously house 6 (BMS6) or 10 (BMS10) bottles; each position is fitted out with a 500 ml. bottle, manometer and 4 scales of 90, 250, 600 and 1000 ppm. B.O.D.
- Refrigerated Incubators
Velp Scientifica's refrigerated incubators were designed for use with the B.O.D. Sensor Systems but can also be used as standard laboratory refrigerated incubators. There is a choice of 120 litre or 207 litre capacity models. All models have two internal electrical sockets so can accomodate the Velp BOD Sensor 6 or Sensor 10 Systems. The 120 litre model FTC120 has a fixed temperature of 20oC whereas the four FOC models (120 and 207 litre) have variable temperature control from 3oC to 50oC. The FOC120I and FOC215I models have an inner transparent door.
'Jar Test' and 'Leaching Test'
Jar Test: The choice and dosing of the chemical coagulant to be adopted for removing suspended solids from wastewater are established based on laboratory evaluation results optimised from the so called Jar Test. Multiple stirrers with reproducible stirring speeds allow the user to adopt standard conditions for the test, a basic requirement in order to get reliable results. Considering the water's variability, the test is repeated at a rate tied to the specific needs.
Leaching Test: This is a test run on solid wastes to be sent to the dump that uses diluted acetic acid or carbon dioxide-saturated water in order to detect the presence of toxic heavy metals.
Velp Scientifica has developed a range of Flocculators environmental equipment for both Jar Test and Leaching Test use:
- JLT4 and JLT6 Flocculators (4 and 6 position respectively) have disconnectable lighted back panel; microprocessor controlled timer with 2 different scales of 0 - 999 minutes, 0 - 99 hours or continuous; digital display of speed and time remaining; stainless steel stirring rods adjustable in height by a self locking chuck; individual speed selector for each stirrer via DC gear motor.
- FP4 is a 4 position, portable flocculator developed for optimum use in the field. It operates with 230V mains power supply or with 12V DC by connecting it to a normal battery or a car's cigarette lighter socket. It has a common speed selector to all stirring rods via DC gear motor; speed selector settable at 20, 40, 50, 100 or 200 rpm.; timer from 0 to 30 minutes or continuous; stainless steel stirring rods adjustable in height by a self locking chuck.
- FCS4 and FCS6 Flocculators (4 and 6 positions respectively) have disconnectable lighted back panel; speed selector settable at 10, 15, 30, 45, 60, 90, 120, 150 and 200 rpm. (possible up to 300 rpm.); individual speed selector for each stirrer vai DC gear motor; stainless steel stirring rods adjustable in height by a self locking chuck.
Rotax Overhead Mixer
Rotating overhead mixers are designed for assessing the solubility of pollutant substances, sludge, sediments and solid wastes in water. The Velp Scientifica Rotax 6.8 Overhead Mixer is designed according to DIN 38414. It can hold 6 x 2 litre bottles or 8 x 1 litre bottles with an adaptor. Electronic control of speed rotation from 0 to 30 rpm. (in 1 rpm. increments).
Mineralisation System for Heavy Metals Trace Determination
Hot mineralisations for calculating mercury, cadmium, lead, chromium, copper, zinc, etc. are carried without losses using water-jacketed condensers. Velp Scientifica has designed the TMD6 and TMD20 systems (6 and 12 positions respectively) for hot digestions of sludge coming from water treatment plants, soil, compost, wastewater or vegetable material with aqua Regis according to the DIN 38414 standard.
- TMD6 consists of a DKS6 digester unit (see ¡®Digesters¡¯ section for details); 6 x test tubes 42 mm. dia. x 300 mm. long, spherical joint; 6 x Allihn condensers; 6 x absorption attachment for condenser; metal frame with lifting handles to position and remove the 6 units on and off the digester block
- TMD20 consists of a DKS20 digester unit (see ¡®Digesters¡¯ section for details); 20 x test tubes 42 mm. dia. x 300 mm. long, spherical joint; 20 x Allihn condensers; 20 x absorption attachment for condenser; metal frame with lifting handles to position and remove the 20 units on and off the digester block
The Velp Scientifica environmental equipment for portable TB1 Turbidimeter allows measurement of turbidity in aqueous samples simply, accurately and directly in Nephelometric Turbidity Units (NTU). By using just a few buttons, the user can perform a simple and quick calibration. The instrument provides the information requested on the standard and sample to be analysed automatically and in just a few seconds.
Measurement range is from 0 to 1000 NTU with accuracy of +/- 2% (in range 0 to 500 NTU) and +/- 3% (in range 501 to 1000 NTU). The TB1 is supplied complete with a set of 4 calibration standards (800, 100, 20 and 0.02 NTU) NIST traceable; 3 vials; cloth; silicone oil; batteries; carrying case.
The Radiation Detector is an industrial standard model of a Geiger-M¨¹ller tube with a thin mica output window. It is factory calibrated using a pulse generator and is usually +/- 15% of the full scale relative to Cesium-137. It carries out detections in milliroentgens / hour and in events / minute (cpm) in three different measurement intervals. The unit is protected by an anti-saturation circuit up to a value equivalent to 100 times the maximum reading in the greatest interval.
The radiation detected is indicated by the hand moving on the graduated scale, a blinking LED and an audible beeper. Power is supplied by a 9V alkaline battery (2000 hours lifetime)
- Range: 0.5oC 5.0oC 50 mR/h; 50oC 5000oC 50,000 cpm; 5oC 50oC 500 mSv
- Sensitivity: α oC detected down to 2.5 MeV with typical detection efficiency greater than 80% at 3.5 MeV
β oC detected at 150 keV with 75% typical detection efficiency
Gamma and X rays typically detected down to 10 keV through the end window and to 40 keV through the case
Environmental equipment consist of:
- B.O.D Determination Systems (mercury-free)
- B.O.D. determination system (using mercury manometers)
- Heavy Metals Trace Analysis
- Leaching Test / Jar Test
- Overhead Mixer (DIN-38-414)
- Refrigerated Incubators
- Steam Distilling Units (and heating digestors)
- Thermoreactors for applications such as C.O.D determinations
- Turbidity Meter (Turbidimeter)
Call Progen Scientific to discuss your requirements about environmental equipment - 020 85422283
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