Eighteenth International Conference on Environmental, Cultural, Economic & Social Sustainability

Abstract

In order to obtain a sustainable technological development, the cultivation of microalgae to assimilate nitrogen and phosphorus from domestic wastewater was satisfactorily studied, but the problem was how to separate the microalgae produced. Therefore, the objective of this study is the determination of the dosage of a domestic solution of chlorine to settle the microalgae. For which, microalgae culture tests were carried out in photobioreactors, using as a culture medium domestic wastewater from a channel that collects municipal wastewater, and microalgae as an inoculum. Photobioreactors are inverted plastic bottles of 20 liters, to accumulate microlagas sedimented in the neck of the bottle. 100, 25, 12 and 6 ml of clarifying solution were dosed in four bottles with 1 liter of biomass volume. With 100 ml, the microalgae spontaneously began to settle and clarify satisfactorily, with 25 ml after one hour, with the other doses after several days. The same procedure was performed on the photobioreactors after drainage of accumulated sludge, 50 ml of clarifying solution per 1 liter of biomass was used, after one hour, the water was clarified satisfactorily. In the all system, BOD removal yield was 70%, nitrogen and phosphorus between 80 and 75%, the chl(a) concentration in the photobioreactors was 2500 μg/L. It is concluded that the proposal is a good sustainable alternative, since research was not used energy but from the sun. In addition, the sludge produced has possible use in soils.