Abstract

LOPEZ-GARCIA, Alma Delia et al. Physico-Chemical Characterization of Urban and Industrial Wastewater and its Importance in Agriculture. Tecnol. cienc. agua [online]. 2016, vol.7, n.6, pp.139-157. ISSN 2007-2422.

The urban and industrial wastewater produced in the Valley of México is used for the irrigation of different crops in the Mezquital Valley. The approximate volume of this water is 56.60 m3/s. In the Spring of 2013, 102 water samples were collected along the Hydrographic system known as Gran canal oriente D.F-Zumpango-Ixmiquilpan-Alfajayucan-Zimapán. The analytic methods that were used to determine the ionic composition of the water samples were those that are described in APHA (1995). The aim of this investigation is the physical and chemical characterization of this water, in order to evaluate the functional relations ESP-SARor , SARadj , and SARcorr . The coefficient of mg = af(EC) was of a = 0.6989, which corresponds to type of water with a composition of SO4-Cl-HCO3. The physical and chemical regime of acid-alkalinity was of pH = 6.95-7.70-8.36. The NaHCO3 content is 0.23-4.66-11.09 mmolc L-1. NaCl content was 0.62-4.84-9.35 mmolc l-1. The coefficient of the functional relation I = af(EC) was of a = 0.0116. The values for SARor are 1.24-12.91, SARcorr 1.30-15.57 and SARadj 1.70-26.20. To calculate the ESP-SAR functional relation, the stoichiometric and heterogenous balance chemical reactions were used; these reactions show that the charges are maintained. The ESP values in the coordinated field ESP-RAS are SARor = 17.90, SARcorr = 20.83, SARadj = 30.69. In the management of the quality of wastewater, SAR must be determined in order to predict which ESP will be found in the surface layers of the soil, which is the area of germination and growth of the seedling emergence of different crops.

Keywords : SAR; ESP; Water quality; agriculture; RSC.

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