Informative testing method of beer
sewage samples for mini-breweries
Authors: Pyrozhenko Ye.V. , Sebko V.V. , Zdorenko V.G. , Zashchepkina N.M. , Markina O.M. 
Published: December 2020

Purpose: of the article is to investigate the theoretical rules of thermal transformer eddy
current converter (TTC) during the preparation of ecological monitoring of brewery sewage
samples based on the implementation of contactless two-parameter eddy current method
of testing of the specific electrical conductivity λt and the temperature t of the beer sewage
sample. It should be noted that this makes it possible to simultaneously prevent the causes
of beer sewage samples deviation from the specified environmental safety indicators and to
take adjustments.
Design/methodology/approach: The theory of TTC operation concerning the electrical
and temperature characteristics testing of beer sewage samples has been further developed
by implement new universal transformation functions Δφt = f (Gt) and Δφ = f (xt), which relate
the normalized difference components of the converter signals to physical and chemical
characteristics of the sample. Due to this, it is possible to simultaneously prevent the causes
of beer sewage samples deviation from the specified ecological safety indicators and to take
appropriate adjustments.
Findings: The method of two-parameter measuring test of the specific electrical
conductivity λt and the temperature t of the beer sewage sample was developed on the
basis of new universal transformation functions. Analysing the numerical data of electrical
conductivity λ, TDS and pH at the initial temperature t1 = 15°C, the alkaline nature of beer
sewage was determined.
Research limitations/implications: The frequency range of the magnetic field f = 80-100
MHz, it is difficult to maintain in laboratory conditions, so the proposed method requires the
use of modern high-frequency equipment, the radius of the probe depends on the radius of
the primary converter frame. And therefore is quite a complicate to find appropriate tank.
Practical implications: is to determine the nature of beer sewage based on the results of
electrical and temperature parameters measurements during implementing a two-parameter
eddy current method, which allows to prevent the reasons for beer sewage samples
deviations from the specified environmental safety measures and to take appropriate
adjustments. An important practical result is also the determination of the signal components
and the normalized characteristics of the primary eddy current converter with a sample of
beer sewage. They allow to calculate, design and create multi-parameter automated devices
for measuring test of the physicochemical parameters of beer sewage samples. In turn, as
a result of the physicochemical composition analysis of the sample, improving the accuracy
of measurements of physicochemical parameters - there is an opportunity to improve and
create advanced methods of wastewater purification on a weak electrolytic basis.
Originality/value: The article originality is the investigation of the theoretical rules of
thermal TTC by implementing a new multi-parameter eddy current method of measuring the
specific electrical conductivity λt and the temperature t of the beer sewage sample based on
the implementation of universal transformation functions Δφt = f (Gt) and Δφ = f (xt) that relate
the converter signals to the physicochemical characteristics of the beer sewage sample,
which helps to prevent the causes of the beer sewage samples deviation from the specified
environmental safety indicators and take appropriate adjustments.