LEMNA MINOR INFLUENCE IN THE TREATMENT OF ORGANIC POLLUTION OF THE INDUSTRIAL EFFLUENTS

The purpose of the research was to determine the influence of industrial wastewater treatment using the Lemna Minor aquatic plant. Certain varieties of macrophyte plants can absorb or retain various contaminants. Thanks to this, it has been determined that the variety known as Lemna Minor presents this type of property. Three treatment trials were carried out varying the amounts of Lemna Minor (100, 200, and 300g). They are keeping constant the retention time of 10 days that were analyzed at 3, 6, and 10 days after the treatment and with a constant volume of the residual effluent. The results indicate that in terms of the parameters that determine organic contamination, BOD was reduced by (61 %); COD was reduced by (68 %) and the concentration of total suspended solids by (61 %).


INTRODUCTION
The effluents from industrial processes coming from dyestuffs present organic matter expressed as chemical oxygen demand (COD), biochemical oxygen demand (BOD), and total suspended solids (TSS).
The bathing ratios (BR) in these types of processes comprise 1:7 to 1:12; this leads to the use of large quantities of water. These effluents must be treated before being introduced into the industrial drainage system, to comply with national regulations related to the use of public sewage systems and to avoid contamination of the receptors.
The main benefit of treatment systems with aquatic plants is their low cost of construction and maintenance, as well as their simplicity of operation using an available resource.The presence of a large amount of organic contamination depletes the oxygen in the water, resulting in a decrease in the appropriate conditions for life, producing fermentations that lead to bad odors. The sedimented solids, many of them are toxic because they carry heavy metals such as Cu, Mn, Cd and Cr (Hoyos et al., 2016).
In this research thesis: Influence of the use of Lemna minor in the treatment of organic contamination of industrial effluents in Cotexsur. The objective of the present work was to determine the influence of the treatment of industrial wastewater from the company Cotexsur, using the aquatic plant Lemna Minor. The research was of an applied type and experimental design with a quantitative approach. The sample was taken considering the convenience and criteria previously evaluated by the types of analysis performed and the treatment proposed (Sun et al., 2020;Walsh et al., 2020).
The theoretical bases that support the research, thus, the advantages of using the Lemna Minor, previous definitions of textile dyes, and parameters for measuring organic contamination. The research was also carried out with Lemna Minor, which has a percentage of removal expressed as COD 72.57 %, BOD5 73.36 %, total solids 75.21 % and in the first six days of treatment with different masses of 100g, 200g of Lemna Minor there is a high percentage of decrease in the concentrations of the mentioned parameters (Hoyos et al., 2016;Li et al., 2020).

METHOD AND INSTRUMENTS
The measurements obtained are analyzed (often using statistical methods).The sample was considered according to convenience. The criteria previously evaluated, the types of analysis performed, and the treatment proposed, therefore the sample was non-probabilistic.
The total volume of the sample was 70 liters from the industrial textile effluents. These 70 liters will be divided into 3 types of treatment: 100g, 200g, and 300g of Lemna Minor and each of the treatments with 7 experimental runs (Coronel, 2016).
For the collection of data, as Rodriguez et al. (2020), which made it possible to have better control over the data that allowed the characterization of the effluents from Cotexsur. The following equipment was used to obtain the concentrations of the parameters: • HI 2210 potentiometer.
• Equipment for determining BOD.
• Digital sterilization and drying oven DHG 9023 A.
The equipment and materials for the analyses were provided by the laboratory of the Universidad Autónoma del Perú, which allowed to determine: PH, Biochemical Oxygen Demand, Chemical Oxygen Demand, and Total Suspended Solids (Jojoa, Rodríguez, & Cardona, 2015

OF COTEXSUR
Wastewater analysis was performed according to standardized methods (Standard Methods for the examination wáter and wastewater, APHA) and instruments, equipment, reagents, which are recommended in the methods.

DESCRIPTIVE
The results obtained in the development of the research are presented below:   Figure 1 show the decrease in the average concentration of BOD as a function of time, for a mass in contact of 100 g of Lemna Minor, the average BOD concentration in the initial time was 823 ppm; when in contact for 3 days the average concentration of BOD decreases to 518 ppm; for 6 days of treatment the BOD concentration was 369 ppm, and for 10 days the BOD concentration was reduced to a concentration of 319 ppm. . In Table 3, we can see the decrease in the average concentration of the biochemical oxygen demand as a function of time. For a mass in contact of 200 g of Lemna Minor, the average concentration for the initial contact time was 823 ppm; when in contact for 3 days, the average concentration of the biochemical oxygen demand decreased to 468 ppm; for 6 days of treatment, the BOD concentration decrease to 346 ppm for 10 days, the BOD concentration was reduced to 389 ppm. In Table 4, the decrease in time-averaged BOD concentrations for a contact mass of 300 g of Lemna Minor is shown. The average concentration for the initial treatment time was 823 ppm. This, when in contact for 3 days, the average concentration of BOD decreases to 429 ppm. For 6 days of contact, the BOD concentration was 331 ppm, and for 10 days, the BOD concentration was 533 ppm.     In Table 6, we can see the decrease in the average concentration of chemical oxygen demand as a function of time for a treatment with a mass of Lemna Minor of 100 g of Lemna Minor, the average concentration in the initial time was 1747 ppm; when being in contact for a period of 3 days, the average concentration of chemical oxygen demand decreases to 1062 ppm; for 6 days of contact the COD concentration was 749 ppm, and in 10 days a COD concentration of 554 ppm is obtained, obtaining a considerable reduction.      In Table 9    In Table 10, the decrease of the average concentrations as a function of time of the total suspended solids for a treatment with a mass of 100 g of Lemna Minor, the average concentration of TSS initially was 124 ppm; when being in contact for 3 days, the average concentration of TSS decreases to 82 ppm; for 6 days of contact, the concentration of TSS 60 ppm and in 10 days a concentration of TSS at 48 ppm is obtained, obtaining a considerable reduction.   In Table 12 the decrease of the average concentrations as a function of time of the total suspended solids for a treatment with a mass of 300 g of Lemna Minor, the average concentration of TSS initially was 124 ppm; when being in contact for 3 days the average concentration of TSS decreases to 75 ppm; for 6 days of contact the concentration of TSS to 51 ppm and in 10 days a concentration of TSS to 99 ppm is obtained, obtaining an increase.      Figure 4 show the average levels of % removal of BOD BOD concentration vs. treatment time for a treatment mass of 100 g of Lemna Minor. On the third day of treatment, 37%, on the sixth day, 53%, and the tenth day of treatment, 61% of average BOD removal was obtained. It is concluded that for the treatment with a mass of 100 g of Lemna Minor, the maximum removal of BOD is obtained at the tenth day of treatment. Source: authors' own elaboration.    Figure 4 show the average levels of % removal of BOD BOD concentration vs. treatment time for a treatment mass of 100 g of Lemna Minor. On the third day of treatment, 37%, on the sixth day, 53%, and the tenth day of treatment, 61% of average BOD removal was obtained. It is concluded that for the treatment with a mass of 100 g of Lemna Minor, the maximum removal of BOD is obtained at the tenth day of treatment.   Source: authors' own elaboration. In Table 16 and Figure 15, the average levels of % removal of concentration of the biochemical demand of oxygen BOD versus the time of treatment for a treatment mass of 300 g of Lemna Minor is observed, obtaining 48% on the third day of treatment, 60% on the sixth day and 35% on the tenth day of treatment of average removal of BOD. It is concluded that for the treatment with a mass of 300 g of Lemna Minor, the maximum removal of BOD is obtained on the sixth day of treatment. In Table 16 and Figure 5, the average levels of % removal of concentration of the biochemical demand of oxygen BOD versus the time of treatment for a treatment mass of 300 g of Lemna Minor is observed, obtaining 48% on the third day of treatment, 60% on the sixth day and 35% on the tenth day of treatment of average removal of BOD. It is concluded that for the treatment with a mass of 300 g of Lemna Minor, the maximum removal of BOD is obtained on the sixth day of treatment.