The assessment and optimization of agricultural reuse of wastewater treatment by-products

Bouanani, Hanane; Kettab, Ahmed; Bensacia, Nabila; Riahi, Rim; Mandi, Laila; Chabaca, Mohamed Naçer; Benziada, Salim; Nakib, Maamer; Djillali, Youcef; Lisaneddine, Amina

doi:10.5004/dwt.2020.26220

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“…Today, the preservation of the environment and water resources depends mainly on the ability to clean wastewater at a low cost before being discharged into nature (Kendouci et al 2013). Many scientific research in dry countries focused on the optimization of wastewater treatment in order to take advantage of their hydric and agronomic features without endangering the receptive environment (Bouanani et al 2020). The processes implemented in conventional facilities, which aim to reduce the pollutant load until reaching an acceptable level to the receiving medium, are generally costly and consist of mechanical, biological, or physicochemical methods, such as adsorption, precipitation, electrolysis, ion exchange, clotting or oxidation, and flocculation processes (Rodier 2009).…”

Section: Introductionmentioning

confidence: 99%

Removal performance for thermotolerant coliforms and fecal streptococci from dairy effluents by Kenadsa’s natural green clay (Bechar-Algeria) in a fixed-bed column

et al. 2021

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This present work is a part of the liquid discharges treatment topic by studying the removal performance for thermotolerant coliforms (FC) and fecal streptococci (F.Strep) by a local natural light green clay from Kenadsa (Bechar-Algeria) under continuous adsorption processes in a fixed-bed column. The study estimated the clay adsorbing efficiency by the adsorption technique for bacteria contaminating the dairy effluent by determining the bacterial load before and after treatment. The mean log counts per 100 ml for FC and F.Strep were assessed by MPN method on liquid medium. The clay material characterizations were made through X-ray diffraction, X fluorescence spectrometry and Fourier transform infrared spectroscopy analysis. Besides, some parameters were estimated such as the breakthrough time tb (clay filter breakdown); the amount of the contaminating bacteria that was removed at the breakthrough time Xb and the exhaustion of disinfection capacity Xe; the total amount of contaminating bacteria flowing through the column Xtotal; and the total removal efficiency (Y). According to the XRD, XRF and FTIR results, the predominant mineral constituents were silicon dioxide, aluminum oxide, ferric oxide and magnesium oxide with rates of 59,44; 18,09; 7,79; and 3,87%, respectively, and hence, their classification among non-swelling clay minerals, illite is the major mineral group of this material. The results of the bacteriological analysis of raw dairy effluents showed an average bacterial load of 3,88 Log10 and 4,1 Log10 CFU/100 mL for FC and F.Strep, respectively, exceeding the thresholds set by the national and the international regulations. The results of the dairy effluents treated by the tested material have shown that the used clay has a relatively high adsorption property for the clay fixed-bed system (3 cm of bed height), expressed by a total removed efficiency Y (%) of FC and F.Strep used to evaluate the column performance ranging from 55 to 84%. It gives a higher log removal for FC and F.Strep (0.98–1.65 Log10) reported from the first adsorption process, and a breakthrough time ranged from 100 to 250 min, which was inversely proportional to the initial bacterial load of discharges and also linked to the nature of the bacterial contaminants. When the breakthrough occurs earlier, the column service life will be shortened. For the studied parameters, the results of treated effluent complied with national and WHO regulations for unrestricted agricultural irrigation, otherwise, as authorized effluents to be discharged into nature without risks. These preliminary results are very promising at laboratory scale as an innovative green technology, treatment method respecting the environment and opens up prospects for the future, where the modification or the optimization of operating conditions such as the bed height of the fixed bed for adsorption, the volumetric flow rate or the clay structure like the particle size distribution of the adsorbents, known as one of the adsorbent classes endowed with an antimicrobial property, can improve the column performance, and further, the removal or even more the disinfection process by adsorption method.

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Section: Introductionmentioning

confidence: 99%