Insights into the technology Utilized to cultivate microalgae in dairy effluents

A combined physico-chemical process is suitable for the effective pretreatment of dairy effluents, achieving almost complete removal of fat, and considerable reduction of protein content. The specific cost of COD removal using the process is only half or a third of that using aerobic biological methods. Depending on the chemicals used, further treatment or, in certain cases, agricultural utilization, of the sludge is possible. In addition, the components remaining in the effluent have low molecular weights, are easily degradable, and are very favourable as nutrients in municipal aerobic post-treatment. Investigation of the sludge showed that it did not contain any pathogen organisms and therefore its application on land is recommended. Laboratory and field experiments have shown that, with agricultural use of the sludge, increased plant growth and grain production were achieved.

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Corn cobs efficiently reduced ammonia volatilization and improved nutrient value of stored dairy effluents

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.144712 ◽

2021 ◽

Vol 769 ◽

pp. 144712

Author(s):

Obemah David Nartey ◽

Deyan Liu ◽

Jean Yves Uwamungu ◽

Jiafa Luo ◽

Stuart Lindsey ◽

...

Keyword(s):

Ammonia Volatilization ◽

Corn Cobs ◽

Nutrient Value ◽

Dairy Effluents

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Treatment of Dairy Effluents in Biological Fluidized-Bed Reactors using Oyster Shells as Ecological Garnishing

Research Journal of Applied Sciences Engineering and Technology ◽

10.19026/rjaset.15.5975 ◽

2018 ◽

Vol 15 (10) ◽

pp. 362-369

Author(s):

Amal Aitcheikh ◽

Nadia Boutaleb ◽

Bouchaib Bahlaouan ◽

Mohammed Bennani ◽

Said Lazar ◽

...

Keyword(s):

Fluidized Bed ◽

Fluidized Bed Reactors ◽

Dairy Effluents

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The Application of Response Surface Methodology in the Study of Photodegraded Industrial Dairy Effluents by the Photo-Fenton Process: Optimization and Economic Viability

ISRN Chemical Engineering ◽

10.1155/2014/967534 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

Carla Cristina Almeida Loures ◽

Hélcio José Izário Filho ◽

Ivy dos Santos Oliveira ◽

Gisella Rossana Lamas Samanamud ◽

André Luiz de Souza ◽

...

Keyword(s):

Oxygen Demand ◽

Statistical Design ◽

Cost Benefit ◽

Process Efficiency ◽

Organic Load ◽

Maximum Efficiency ◽

Fenton Process ◽

Fenton Reagent ◽

Benefit Evaluation ◽

Dairy Effluents

This study presents results from an application of Photo-Fenton process for organic-load reduction in dairy effluents. Process efficiency was evaluated in terms of percentage dissolved organic carbon, chemical oxygen demand, and biochemical oxygen demand (DOC, COD, and BOD, resp.), whose initial values were 1658±145 mg O2 L−1, 9500±500 mg O2 L−1, and 2400 ± 100 mg O2 L−1, respectively. We applied a statistical design represented by Box-Behnken factorial design inclusive of Fenton's reagent, the power of applied radiation (W), and pH factors. The set temperature value was 30°C with a reaction time of 60 min. The maximum efficiency obtained was at pH=3.5, Fenton reagent in the proportion of 35 g H2O2 + 3.6 g Fe2+, and ultraviolet radiation potency of 28 W. The results obtained for DOC, COD, and BOD were 81%, 90.7%, and 78.8%, respectively. Regarding the cost/benefit evaluation, the variables and their levels should be the following: pH 3.5, 35.0 g H2O2/Fe2+ 3.6 g, and 28 W UV, obtaining a reduction in concentration of 79.5% DOC.

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Use of native aquatic macrophytes in the reduction of organic matter from dairy effluents

International Journal of Phytoremediation ◽

10.1080/15226514.2017.1284750 ◽

2017 ◽

Vol 19 (8) ◽

pp. 781-788 ◽

Cited By ~ 4

Author(s):

Rita de Cássia Souza de Queiroz ◽

Rodrigo Santos Andrade ◽

Isadora Rosário Dantas ◽

Vinícius de Souza Ribeiro ◽

Luciano Brito Rodrigues Neto ◽

...

Keyword(s):

Organic Matter ◽

Aquatic Macrophytes ◽

Dairy Effluents

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Effect of agitation on the performance of an anaerobic sequencing batch biofilm reactor in the treatment of dairy effluents

Water Science & Technology ◽

10.2166/wst.2011.281 ◽

2011 ◽

Vol 63 (5) ◽

pp. 995-1003 ◽

Cited By ~ 6

Author(s):

T. Z. Penteado ◽

R. S. S. Santana ◽

A. L. B. Dibiazi ◽

S. C. de Pinho ◽

R. Ribeiro ◽

...

Keyword(s):

Organic Matter ◽

Particulate Organic Matter ◽

Oxygen Demand ◽

Anaerobic Treatment ◽

Biofilm Reactor ◽

Volatile Acid ◽

Batch Reactors ◽

Agitation Rate ◽

Organic Matter Concentration ◽

Dairy Effluents

Agitation rate is an important parameter in the operation of Anaerobic Sequencing Biofilm Batch Reactors (ASBBRs), and a proper agitation rate guarantees good mixing, improves mass transfer, and enhances the solubility of the particulate organic matter. Dairy effluents have a high amount of particulate organic matter, and their anaerobic digestion presents inhibitory intermediates (e.g., long-chain fatty acids). The importance of studying agitation in such batch systems is clear. The present study aimed to evaluate how agitation frequency influences the anaerobic treatment of dairy effluents. The ASBBR was fed with wastewater from milk pasteurisation process and cheese manufacture with no whey segregation. The organic matter concentration, measured as chemical oxygen demand (COD), was maintained at approximately 8,000 mg/L. The reactor was operated with four agitation frequencies: 500 rpm, 350 rpm, 200 rpm, and no agitation. In terms of COD removal efficiency, similar results were observed for 500 rpm and 350 rpm (around 90%) and for 200 rpm and no agitation (around 80%). Increasing the system’s agitation thus not only improved the global efficiency of organic matter removal but also influenced volatile acid production and consumption and clearly modified this balance in each experimental condition.

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