Évolution de la qualité physico-chimique et bactériologique d’un effluent laitier sur un cycle annuel

Hamdani, Ahmed; Moufti, A.; Mountadar, M.; Assobhei, O.

doi:10.4267/dechets-sciences-techniques.1880

Cited by 4 publications

(9 citation statements)

References 5 publications

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“…Since the treatment operation is not functional at the studied dairy industry, the proliferation of contaminant bacteria is justified, where the bacteriological analysis results of the raw dairy effluents showed a significant bacterial load. These results are in agreement with a previous study carried out by Benyagoub et al (2018a) on dairy effluents discharged from the same studied dairy industry where a load of thermotolerant coliforms and fecal streptococci were in the range of 2,07 log 10 to 5,2 log 10 CFU/100 mL, and from 1,84 log 10 to 5,9 log 10 CFU/100 mL, respectively, and remains lower than that reported by Hamdani et al (2005) in which the studied dairy effluents during a year have thermotolerant coliforms and fecal streptococci loads ranging from 4,29 to 4,6 log 10 CFU/mL.…”

Section: Discussionsupporting

confidence: 93%

“…Finally, we must focus on two essential points: First, the regeneration of the saturated adsorbent during the scaling-up by moving from the laboratory stage to the industrial scale, which can be considered as waste and its disposal, cannot be an economical option. This may include chemical, biological, or thermal way as practical methods, and according to El-Naas and Alhaija (2011), the most common methods consist of temperature changes (thermal swing adsorption) and changes in pressure (pressure swing adsorption); Second, the studied dairy industry should establish a program to limit the volume and pollutant load of discharged dairy effluents (Hamdani et al 2005;Benyagoub 2019).…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

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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“…These values depend on the use of hot water where the wastewater generated by pre-rinsing operations and detergent cleaning carried out at temperatures up to 55 and 70 °C, respectively, are too hot, and the regenerative heat exchange in dairy processing (Sayad 2015). The values found are close to those cited by Raho ghalem (2017), which were between 19 and 22 °C, and similar to that cited by Sekkoum (2004), which were between 20 and 25 °C for the raw effluent and 29 °C after its biological treatment, but they are higher than those cited by Mahrouche and Saaoui (2017), which were between 11.8 and 25.1 °C, and lower than that cited by Hamdani et al (2005), working on the dairy effluents from Djedida dairy unit (Morocco), which were between 23 and 43 °C with an average temperature value of 33 °C.…”

Section: Discussionsupporting

confidence: 88%

“…As a result, the analyzed dairy effluents were milky (i.e., mainly diluted milk or milk products) and characterized by a hydrogen potential (pH) ranging from 5.09 to 8.27, slightly alkaline, and located in the range recommended by the Algerian standard. These variations in pH depend on the use of chemicals such as nitric acid and NaOH (caustic soda) in the cleaning and disinfecting operation for equipment, and piping circuit of dairy industry (Hamdani et al 2005), which can influence the pH of the receptor medium (Rodier et al 1996).…”

Section: Discussionmentioning

confidence: 99%

Risk assessment for chemical pollution of dairy effluents from a milk processing plant located in Bechar (Southwest of Algeria)

Nabbou¹,

Benyagoub²,

Mellouk³

et al. 2020

Appl Water Sci

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Milk and dairy products’ production lines generate pollution in the form of food waste. The management of this waste concerns professionals that fit the purpose of this study to assess the chemical risk of the raw liquid effluents that are discharged from a milk processing plant located in Bechar (Southwest of Algeria) by analyzing the main chemical indicator parameters of water pollution following official analytical methods. A total of ten samples were analyzed during the months of February, March and April of the year 2019. The obtained results were interpreted according to the regulatory requirements recommended by the Algerian standard related to threshold limit of physicochemical parameters’ values. The obtained results showed pollution signs revealed by high levels of the organic matters, expressed by significant means related to the following parameters: chemical oxygen demand (COD: 810.33 mg/L), 5 days-biochemical oxygen demand (BOD5: 797.91 mg/L), total suspended solids (TSS: 47.3 mg/L) and turbidity (174.014 NTU) exceeding those required by the national standard, except other physicochemical parameters, such as pH, conductivity, sulfate, nitrate and nitrite contents that did not exceed the threshold of acceptable values. Although these raw effluents present a high organic load expressed by average BOD5/COD ratio equal to 0.985, they constitute organic matters in a dissolved form (average value of the TSS/BOD5 ratio = 0.076). Furthermore, The COD/BOD5 ratio that had an average value equal to 1.015 underlines the biodegradability character of discharged dairy effluents. The high pollution levels which are aggravated by the lack of wastewater treatment can hurt the environment and the biological diversity and, therefore the humans' health. This requires an immediate intervention for a solution, where it is very important that proper wastewater treatment systems should be installed for the environment protection and for the ecological balance. Otherwise, it may constitute a risk to the public health on medium- to long-term by affecting the quality of the underground reservoir known as the main source of supply for the inhabitants of arid and semi-arid areas.

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“…Some groundwater can also be contaminated with nitrates due to the leaching of natural vegetation [6]. The nitrate content ranged from 4.96 to 21327.44 mg L-1; this is probably due to the use of nitric acid as a chemical disinfectant for closed pipeline circuits [20], by the nitri cation reaction of the organic nitrogen present in industrial e uents at the basin level . In fact, nitri cation is a two-step process in which ammoniacal nitrogen is oxidized to nitrites (NO2-) then to nitrates (NO3-) [21].…”

Section: Discussionmentioning

confidence: 99%

Risk Assessment of Chemical Pollution of Industrial Effluents From A Soap Production Plant Located In Bafoussam (Western Region of Cameroon)

Mathurin

Kisito

2021

Preprint

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The MEWOU river, which runs through the town of Bafoussam, is one of the main sources of drinking water and irrigation for the people who live there. It is subject to intense agricultural and industrial activity all along its banks. Soap and refined oil factories generate pollution in the form of liquid effluent which is released without any form of treatment. A total of seven samples were analyzed during the months of March, April and May of the year 2021. The results we obtained were analyzed according to the regulatory requirements recommended by the Guidelines for the quality of drinking water and the Algerian standard relating to the limit values of physicochemical parameters. The results we obtained showed signs of significant pollution in particular: chemical oxygen demand (COD: 125.32-959 mg L-1), 5 days-biochemical oxygen demand (BOD5: 23-99 mg L-1), turbidity (2-520 NTU), TDS (130-13430 mg L-1), Nitrite (4.96-21327.44 mg L-1) and many other parameters greatly exceed those required by the international standard, we have also noted a strong pollution to heavy metals: chromium (35.76- 1381.08 mg L-1), lead (0.21 - 2.49 mg L-1), iron (0.28- 17.82 mg L-1), and cadmium (0 , 03-0.19 mg L-1) which are above the values prescribed by the WHO. These heavily polluted effluents released into the natural environment are harmful to the environment, biodiversity and human health. This state of affairs requires urgent intervention to preserve the ecological balance. Otherwise, it can constitute a risk for public health in the short term by deteriorating the quality of the underground reservoir known as the main source of water supply for the local populations.

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Évolution de la qualité physico-chimique et bactériologique d’un effluent laitier sur un cycle annuel

Abstract: Boues d'industries de traitement de surface Bibliographie

Cited by 4 publications

References 5 publications

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

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

Risk assessment for chemical pollution of dairy effluents from a milk processing plant located in Bechar (Southwest of Algeria)

Risk Assessment of Chemical Pollution of Industrial Effluents From A Soap Production Plant Located In Bafoussam (Western Region of Cameroon)

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