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Proceedings of the International Academy of Ecology and Environmental Sciences, 2019, 9(4): 164-174
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Article

Acidification of recalcitrant effluent: Optimization of time and reagent volume

Maria Luisa P. R. Alves1, Elisangela Maria R. Rocha2, Samara Teixeira Pereira3, Elson Santos da Silva4, Romildo H. dos Anjos Junior4
1Graduate in Environmental Engineering, Federal University of Paraiba, Joao Pessoa, Brazil
2Civil and Environmental Engineering Department (DECA), Federal University of Paraiba, Joao Pessoa, Brazil
3Graduate Program in Civil and Environmental Enginnering, Federal University of Paraiba, Joao Pessoa, Brazil
4Laboratory of Environmental Sanitation (LABSAM), Federal University of Paraiba, Joao Pessoa, Brazil

Received 3 September 2019;Accepted 5 October 2019;Published 1 December 2019
IAEES

Abstract
Hydric bodies suffer from the discharge of recalcitrant effluents, such as landfill leachate, which requires advanced treatment, such as photo-Fenton. Though, it requires a acidification step of effluent to adjust it to pH¡Ö3. The objective of this work was to apply sulfuric acid (H2SO4) and hydrochloric acid (HCl) in different concentrations in the gross leached, and decide which of one would be better in relation to time optimization and volume of acid spent. Potentiometric curves and trend lines were formulated by the polynomial regression degree 5 and the hypothesis test was used to determine the volumes to be added, to achieve the desired pH (pH 3). The H2SO4 (6 N) presented better results in the average time control of 6 min 35 s - while spending 27 min 50 s without the potentiometric curves. From hypothesis test, sulfuric acid achieved the best result when compared to the final, theoretical and real volume used in the acidification of the leachate.

Keywords leached;pH;hypothesis test;potentiometric curve;reagent concentration.


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