Abstract
This research sought to determine the ideal percentage of soaking water from the tannery industry as a nutrient source for the microalgae Chlorella sp.; evaluating the effect of the initial concentration of 15, 30, 45, 60 and 75% of soaking water in contact with the microalgae in a first phase and a new evaluation with 30, 45 and 60% of soaking water using the adapted microalgae from the first phase into the second. Cell density over time was determined by cell counting in a neubauer chamber until reaching the stationary phase in all samples. The results show that the microalgae adapted to the effluent used present growth kinetics more similar to that of microalgae grown in a conventional medium. In the same way, it was determined that a better cell growth was obtained with a 30% concentration of soaking water. It is concluded that the use of soaking water is an efficient way to cultivate microalgae, thus helping to reduce pollution from tannery effluents.
Highlights
The leather tanning industry is one of the industries that requires the most water for its production process, it is one of those that has the most polluting effluents due to the presence of sulfides, its high organic and inorganic load, as well as the large amount of suspended matter, colorants, the high content of chromium and other metals. (Chowdhury et al, 2015).Please cite this article as: Mendoza J., Guerrero A., Vásquez C., Alfaro A., Flores G
The growth results of the Chlorella sp microalgae are shown by evaluating its cell density in different concentrations of soaking water, all of them compared to the growth curve of a control reactor without exposure to effluent
The pretreated soaking water used in the experiments showed that it is a source of nutrients for the microalgae Chlorella sp., Exceeding in certain concentrations the conventional nutrient used in the cultivation of this microalgae, these concentrations were 15 and 30%, as shown observed in figure 1
Summary
The leather tanning industry is one of the industries that requires the most water for its production process, it is one of those that has the most polluting effluents due to the presence of sulfides, its high organic and inorganic load, as well as the large amount of suspended matter, colorants, the high content of chromium and other metals. (Chowdhury et al, 2015). The leather tanning industry is one of the industries that requires the most water for its production process, it is one of those that has the most polluting effluents due to the presence of sulfides, its high organic and inorganic load, as well as the large amount of suspended matter, colorants, the high content of chromium and other metals. It is calculated that to process 1 Kg of skin, between 25 and 80 L of water are required (Swartz et al, 2017), with the soaking stage representing around 50-55% of the total load of pollutants discharged by it. Industry (Chowdhury et al, 2015), having as typical components salt, manure, blood, dirt, globular skin proteins, biocides, surfactants and degreasers. The biomass that is generated thanks to its adaptability to a great diversity of ecosystems and biotechnological processes, can be used in or for the production of food, concentrates, active compounds, biofuels, biofertilizers and bioremediation. (Ortiz et al, 2012)
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