Analytical instruments - VELP Scientifica
VELP Scientifica - Via Stazione, 16 - 20865 Usmate (MB) ITALY - Tel. +39 039 62 88 11 - Fax. +39 039 62 88 120
Analytical instruments - VELP Scientifica
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VELP Inc. U.S.
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VELP Scientifica has developed a complete line of instruments to support the lab technician working in the environmental sector and for the separation of pollutants in waste-water treatment plants.

  • Flocculators, or jar testers, are designed for a range of applications
    - Testing the efficiency of flocculation or precipitation agents
    - Leaching test, made on solid wastes to be sent to the dump that uses diluted acetic acid or carbon dioxide-saturated water to detect the presence of toxic heavy metals
    - ASTM D2035 compliant method
  • Jar testing entails adjusting the amount of treatment chemicals and the sequence in which they are added to samples of raw water held in jars or beakers
    The sample is then stirred so that the formation, development, and settlement of floc can be watched just as it would be in the full-scale treatment plant
  • Why perform a jar test?
    - Optimization is the key to running the plant more efficiently
    - Alternative treatment doses can be tried without altering the full-scale treatment plant
    - The results of several different chemical treatments can be compared
    - Save money by avoiding overfeeding or overdosing, especially with coagulants; this may not hurt the quality of water, but it can cost a lot of money
  • When to perform a jar test?
    - Seasonally, monthly, weekly, daily
    - There is no set indication about how often jar testing should be conducted
    - The more frequently it is done, the better the plant will operate
  • How to perform a jar test
    - For each sample, usually raw water, a number of beakers (jars) are filled with the same amount of aqueous sample
    - Each beaker is treated with different doses of chemical
    - Other parameters may be altered besides dosage, including chemical types, mixing rate, aeration level/time, filtration type, etc.
    - By comparing the final water quality in each beaker, the effect of the different treatment parameters can be determined and the best formula can be reproduced on a large scale


FP4 Portable Flocculator

Portable flocculator that allows standard conditions to be adopted for jar test, that are the basic requirement for reproducible results.
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JLT Series Flocculators

Flocculators with multiple stirrers to allow standard conditions to be met during analysis, a basic requirement in order to obtain reliable and repeatable results.
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FC S Series Flocculators with Independent Positions

Flocculators with independent positions that allow standard conditions to be adopted for jar test, that are the basic requirement for reproducible results.
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