Banca de DEFESA: KÁRLIA DALLA SANTA AMARAL

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : KÁRLIA DALLA SANTA AMARAL
DATE: 27/05/2021
TIME: 14:30
LOCAL: Vídeo Conferência
TITLE:

DESALINATION SYSTEMS IN THE SEMI-ARID REGION OF RIO GRANDE DO NORTE: SOCIAL PERCEPTION AND ASSESSMENT OF WATER QUALITY FOR AGRICULTURAL PRODUCTION ACTIVITIES.

KEY WORDS:

Animal watering; Irrigation; brackish concentrate; Groundwater; Rural communities

PAGES: 165
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Most of the territory of the state of Rio Grande do Norte (RN) is inserted within the drought polygon, a region where more than half of the population live in rural areas. To improve the drinking water in the region, desalination equipment was installed, however, this equipment has generated a large amount of brackish waste. Thus, this study sought to investigate the quality of underground water and desalination by-products in agricultural activities and to evaluate community perceptions of this technology. The database used, which was mostly provided by the Programa Água Doce (PAD), consisted water quality reports and semi-structured interviews carried out in 33 municipalities in RN. An evaluation of underground water for irrigation purposes, which is discussed in the first chapter, revealed that the pH, conductivity, total dissolved solids (TDS), chloride, manganese, uranium, and zinc levels were above the limits recommended to cultivate vegetables. The waters in almost half of the wells presented high risks of soil salinization (43%), but low risks of sodification (45%). All the water sources analyzed were inadequate to cultivate most sensitive plants as they had sodium levels (> 115 mg/L) that can cause some degree of leaf damage. With respect to raising livestock, STD, the concentrations of magnesium, sulphate and manganese were above the maximum recommended values. In the second chapter, the physical-chemical composition of the groundwater and concentrate was used to determine quality indices, given their use in irrigation and livestock desedimentation. Well water (51%) and concentrate (65%) qualities were found to have higher percentages classified as poor and very poor for plant growth, respectively. Conversely, most of the groundwater (87%) and brackish waste (71%) were classified in the best quality classes (excellent and good) for livestock raising. A diagnosis of the desalination systems, which is carried out in the third chapter, revealed that in 42 locations 53% of the families used the desalination systems. Fixed monthly expenses such as: electricity (62%), operator salaries (90%) and reserve funds (100%) were mostly paid by communities themselves. After the desalinizators were implanted, an evaluation of the management model and service performance was carried out and revealed a 90% satisfactory response rate (excellent and good) for each aspect and/or variable analyzed. With respect to perceptions on the quality of sources of consumed water (cisterns and desalinated water), which were evaluated in four locations, 46% of respondents reported perceiving changes in the organoleptic properties of the water, mainly that they could taste chlorine and/or salts. About half of the respondents said they had received information on good hygiene and sanitary practices. Diseases, such as diarrhea and verminosis, were the most frequently cited examples. Community management tools proved to be important to maintaining desalinizators. However, this study found that there is a need for greater awareness among the population, for example through educational approaches and social communication, on the risks associated with this water for human consumption.

BANKING MEMBERS:
Externa ao Programa - 2190974 - JOANA DARC FREIRE DE MEDEIROS
Externo à Instituição - JOSÉ ARAÚJO DANTAS
Presidente - 707.819.324-59 - JULIO ALEJANDRO NAVONI - UFRN
Interna - 2200167 - MAGNOLIA FERNANDES FLORENCIO DE ARAUJO
Externa à Instituição - MARIA CRISTINA BASÍLIO CRISPIM DA SILVA - UFPB