Banca de DEFESA: FELIPE MENDONÇA GUERRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FELIPE MENDONÇA GUERRA
DATE: 10/05/2024
TIME: 14:00
LOCAL: Google Meet - meet.google.com/mbm-abyw-ujo
TITLE:

Study of the treatability of liquid effluents generated in an electroplating industry by different physical-chemical processes.

KEY WORDS:

Electroplating, industrial effluent, treatment and reuse.

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

The metal coatings industry generates effluents classified as highly dangerous. Currently, the
generation of high volumes of wastewater represents one of the major problems caused by
industrialization, mainly due to releases with high concentrations of non-biodegradable heavy
metals, which end up generating significant impacts on the environment and impose
restrictions related to disposal limits and prevention measures. Conventional effluent
treatment is generally based on physical-chemical treatment, which seeks neutralization,
removal of cyanides, metals and oils and grease. In this work, alternatives for the physical-
chemical treatment of liquid effluents generated in the electroplating processes arising from
the parts polishing stage were evaluated, aiming to reduce the concentration of the metals
Copper (Cu), Nickel (Ni) and Zinc (Zn) in addition to of COD removal from the effluent from
bench tests. The processes generating effluents were identified, followed by quantitative and
qualitative characterization. The study was developed at the university's Sanitation Laboratory
(LABSAN), using three treatments: precipitation, coagulation/flocculation and adsorption on
activated carbon. The tests were carried out on a bench scale, using Jar tests and tests with
ICP equipment. The samples that presented the lowest concentration of the metals studied
were selected to carry out phytotoxicity tests on raw effluents and those treated with Solanum
seeds. lycopersicum. In the precipitation treatment, the best concentration obtained in the
treatment with sodium carbonate C1T20(20mg/L) and for sodium hydroxide C2T40(30 mg/L)
and the best zinc removal of 99.86% efficiency, in the treatment of coagulation/flocculation
aluminum sulfate was more effective than PAC with better efficiency at concentration D350
(350mg/L) and the best removal was 98.67% for copper concentration. In the adsorption
treatment, no significant differences were observed in the reduction of COD and metal
concentration between powdered (CAP) and granulated (CAG) activated carbon, and the best
removal was 99.18% for copper, 87.71% for nickel and 99.52% for zinc. Regarding the
phytotoxicity tests, it was possible to observe that, for the growth of the hypocotyl, the best
treatment conditions were precipitation with sodium carbonate(PRE-CA), coagulation with
aluminum sulfate(CO-AS), adsorption with activated carbon powder, (ADS-CAP) and
adsorption with granulated activated carbon (ADS-CAG), showing no difference between
them (p < 0.05). As for the radicle, the best growth condition was observed in the ADS-CAG
adsorption treatment. It is worth mentioning that for both cases the CO-PAC treatment was
not effective for the use of tomato growth, presenting growth values below the gross effluent.
The results highlight the importance of appropriately choosing treatment techniques and
optimizing operational parameters to meet environmental standards and ensure effective
removal of pollutants in industrial effluents.

COMMITTEE MEMBERS:
Presidente - ROSANGELA GOMES TAVARES
Interno - ALEX SOUZA MORAES
Externo à Instituição - NELSON MEDEIROS DE LIMA FILHO