Banca de DEFESA: LAIANY TÁSSILA FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LAIANY TÁSSILA FERREIRA
DATE: 03/11/2021
TIME: 09:00
LOCAL: meet.google.com/gae-tguo-fyj
TITLE:

Characterization and effect of filtered graywater in irrigated cultivation on family farming in the Pajeú backwood.

KEY WORDS:

Wastewater. Hydrical stress. Wastewater treatment.

PAGES: 114
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Water is a limited good, directly impacted by population growth and by activities essential to meet human needs such as agricultural practices, which, in regions with low or poorly distributed priority, resort to irrigation to meet the water needs of crops. The intensive use of natural resources in agriculture has put pressure on water reserves, making it necessary to search for sustainable alternatives that make water available for other activities, with emphasis on the reuse of domestic gray water. In this context, this research aimed to characterize the quality of domestic effluent and its effect on the irrigation of the grain sorghum crop IPA-1011, subjected to different water regimes with emphasis on soil water depletion. The research was carried out with filtered gray water collected in a rural residence that uses a physical treatment system for gray water reuse (RAC). The characterization of the gray water from the RAC was carried out, as well as the supply water used by the resident family, for which parameters such as EC, pH, turbidity and the presence of the chemical elements calcium, sodium, chloride, bicarbonate, potassium, boron were determined, copper, iron, manganese and magnesium, tests were carried out with different configurations of filtering layers, in order to monitor the quality of the effluent after a second filtration, in addition to determining the flow time and instantaneous flow in saturated and non-saturated filtering layers. saturated. The gray water collected in the rural residence was also destined for sorghum irrigation, in a randomized block design with a 5 x 2 + 1 factorial scheme with three replications, having as first factor the irrigation depths with filtered gray water (Ɵ residual, 20%, 40%, 60%, and 100% of the water available in the soil), with the second factor referring to the irrigation shifts of 3 and 6 days, and an additional treatment that was conducted to 100% of the water available in the soil using if supply water. It was found that the supply water and gray water, both collected in the rural residence, were classified for irrigation purposes as C3S1 with high risk of salinization and low risk of sodicity. It is noteworthy that the increase in chemical products used in the home did not change the water class for irrigation, but it increased the salinity of gray water by 61.8% compared to the supply water. The quality of domestic effluent is greatly impacted by the lack of maintenance of the RAC system and by the delay in cleaning the grease trap. The introduction of wood shavings as one of the filtering elements proved to be efficient in improving the final flow of the filters, in addition to preventing the retention of water on the surface of the filters. The biometrics carried out during the cultivation of IPA-1011 sorghum proved that irrigation with filtered gray water favored the development of the culture when compared to plants of this plant species submitted to dryland conditions and that plants managed with 60% of the water available in the soil presented a satisfactory performance for the analyzed parameters, standing out as a promising reference level for gray water irrigation in a water stress situation.

BANKING MEMBERS:
Presidente - 1646479 - GENIVAL BARROS JUNIOR
Externo ao Programa - 1827653 - JOSE AMILTON SANTOS JUNIOR
Interno - 1079630 - JOSE RAMON BARROS CANTALICE