Banca de DEFESA: MICHELLE LAYRA CUNHA REZENDE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MICHELLE LAYRA CUNHA REZENDE
DATE: 27/11/2020
TIME: 16:00
LOCAL: Google Meet (meet.google.com/vsi-atgz-hzs)
TITLE:

ADAPTATION OF THE 5220-D STANDARD METHODS METHODOLOGY FOR THE DETERMINATION OF THE CHEMICAL DEMAND FOR OXYGEN (COD), WITHOUT DIGESTION BY ARTIFICIAL HEATING OF THE SAMPLE

KEY WORDS:

COD; organic matter; quantification; adaptation of methodology; methodology validation.

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SUMMARY:

Chemical oxygen demand (COD) is a global parameter used as an indicator of organic content in wastewater and surface water as well as for the monitoring of wastewater treatment plants. Thus, the new method proposed for analyzing COD in samples aims to contribute and facilitate the process of determining organic matter in wastewater treatment plants in order to save costs and time.
Currently, the method used to determine the Chemical Oxygen Demand (COD) most used for closed reflux is the Standard Methods 5220D Methodology, in which tubes with samples containing potassium biftalate, mercury sulfate, potassium dichromate and distilled water are carried out. a digester and then left to cool before their respective absorbances are measured and their COD calculated. This process has some disadvantages regarding digestion, as samples must be digested for a period of approximately 2 hours before reading their absorbances.
In order to optimize the analysis time of this method, the present utility model was developed, whereby the absorbances of the samples are obtained through an equation that correlates the absorbances of the samples right after their oxidation, without going through the process of digestion.
In addition, it is also proposed to validate the methodology through tests of accuracy, precision, robustness, linearity, selectivity and sensitivity independent of the organic material to be analyzed. The main advantage of this model is the saving of time, expenses with the purchase of the equipment and also the reduction of electrical energy, due to the non-use of the digestor block.

BANKING MEMBERS:
Presidente - 1985765 - FABIANO LUIZ NAVES
Interna - 1810303 - PATRICIA DA LUZ MESQUITA
Interna - 1861356 - CRISTIANE MEDINA FINZI QUINTAO
Externa à Instituição - LARISSA CARVALHO SOARES AMARAL