Treatment of Agricultural Wastewater with Chlorpyrifos by Coupling of Heterogeneous Photocatalysis and Anaerobic Biologi
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ORIGINAL PAPER
Treatment of Agricultural Wastewater with Chlorpyrifos by Coupling of Heterogeneous Photocatalysis and Anaerobic Biological Process Dorance Becerra1 · Ingrid Barrientos1 · Ana Rodriguez1 · Fiderman Machuca‑Martinez2 · Luisa Ramírez1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Treatment of wastewater with Chlorpyrifos content using heterogeneous photocatalysis was evaluated, for which a compound parabolic collector (CPC) was used, under different combinations of pH and T iO2 concentration designed using the response surface methodology (RSM), and an anaerobic biological process based on the specific methanogenic activity test (SMA), using a flocculent sludge and an initial concentration of 2.0 g VSS/L. Initially, water resulting from the triple washing of equipment for manual application of Chlorpyrifos from the El Zulia Irrigation District and the municipality of Bucarasica were characterized. In the biological process, COD and TOC removals of 46.4% and 86.6% were obtained; while by applying preliminary photocatalytic processes, under optimal conditions of T iO2 (100 mg/L), pH (3 units) and retention time (3 h), better biodegradability efficiencies (72.2% and 53.0%) were achieved. The results revealed that the combined use of advanced oxidation processes with biological treatment technologies is technically viable, as it increases the efficiency of removing contaminants from agricultural effluents with Chlorpyrifos. Keywords Pesticides · Compound parabolic collector · TiO2 · Response surface methodology · Specific methanogenic activity · Real wastewater
1 Introduction The overpopulation of planet Earth has generated the growing need for food, so much so that today agriculture is the activity that has the most land area for its processes, which has led to a considerable increase in the use of pesticides in last years, reaching growth rates of 4 to 5.4% in some regions, since these, are applied intensively and without appropriate measures in many countries, both developed and developing [1]. As a consequence, the use of this chemical products has generated a lot of negative effects in the environment, mainly contaminating the hydric resource with carcinogenic agents and other toxics, which can cause poisoning events with
* Dorance Becerra [email protected] 1
Facultad de Ciencias Agrarias y del Ambiente, Universidad Francisco de Paula Santander, Norte de Santander, Cúcuta, Colombia
Facultad de Ingeniería, Universidad del Valle, Valle del Cauca, Cali, Colombia
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risks to human health and loss of biodiversity, which makes it one of the most important environmental problems [1, 2]. Several biological, chemical and physical methods have been applied to treatment of wastewater with pesticide content and reduce the impact of its use. However, these technologies are significantly expensive, have low efficiency and, sometimes, do not constitute appropriate alternatives for the treatment of this type of waste [3, 4]. Now, new technologies have been de
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