Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Chollom, Martha Noro; Rathilal, Sudesh; Swalaha, Feroz Mahomed; Bakare, Babatunde Femi; Tetteh, Emmanuel Kweinor

doi:10.2495/ws190221

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…6-A. Despite the ratio and the time of digestion, pH values were comprised between 6.5 -8.5, ideal condition for good anaerobic digestion [37][38]. There is an increase in the final pH in the digester comparatively to the initial pH in the digester (Fig.…”

Section: Effect Of C/n Ratiomentioning

confidence: 99%

Bioenergy Potential and Kinetic of Biogas Production in Anaerobic Digestion of Slaughterhouse Effluent

Houndedjihou

Kodom

Tchakala

et al. 2022

Preprint

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A great amount of wastewater is generated each day from the slaughterhouse located in the harbor area (Togo). This amount of wastewater is a source of environmental pollution and degradation of water quality, as it is discharged with no treatment. The wastewater produced by slaughterhouses is biodegradable with a ratio between biological oxygen demand (BOD5) and chemical oxygen demand (COD) (BOD5/COD) > 0.5. Anaerobic co-digestion was used in this study to assess the bio-energy potential and kinetics of biogas production during processing. An effective anaerobic digestion design shows that over 90% of organic material was removed when inoculation and the carbon/nitrogen (C/N) ratio were adjusted. Biogas production was significantly affected by COD concentration, inoculation and C/N ratio. The cumulative volume of biogas increased from 415 mL to 2,150 mL as the substrate/inoculum (S/I) ratio has decreased from 2.028 to 0.337, while the cumulative volume of biogas increased from 1,140 mL to 5,250 mL as the C/N ratio increased from 6 to 22. The biogas produced has a high calorific value, as the methane content is 74% after simple purification with a concentrated solution of NaOH. Among the three kinetic models used to describe biogas production, a modified Gompertz model was found to be the best with R2 between 0.983 and 0.993. Then, the logistical model with R2 between 0.902 and 0.928 and the first order kinetic model with R2 between 0.552 and 0.704

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Section: Effect Of C/n Ratiomentioning

confidence: 99%

Bioenergy Potential and Kinetic of Biogas Production in Anaerobic Digestion of Slaughterhouse Effluent

Houndedjihou

Kodom

Tchakala

et al. 2022

Preprint

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“…In general, the biological treatment processes are the most widely applicable technologies for poultry slaughterhouse wastewater. In the literature, several investigations based on up-flow anaerobic sludge blanket reactors achieved more than 90% COD removal efficiency from poultry slaughterhouse wastewater [ 19 , 20 ]. According to Aziz et al, that investigated the performance of submerged fibers in an attached growth sequential batch reactor for poultry slaughterhouse wastewater treatment, more than 93% for BOD and COD was achieved,…”

Section: Introductionmentioning

confidence: 99%

Assessing the Influence of Electrode Polarity on the Treatment of Poultry Slaughterhouse Wastewater

et al. 2022

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Electrochemical methods have been increasingly gaining popularity in the field of wastewater treatment. However, the performance of these methods can be highly affected by the polarity direction as determined by the electrodes arrangement (anode to cathode or cathode to anode); as well as the characteristics of the wastewater to be treated as determined by the type of wastewater. The presented research work investigated the relationship between polarity direction and the removal of pollutants from poultry slaughterhouse wastewater using titanium and aluminium electrode materials. In the first case, the wastewater was exposed to the Ti (anode)-Al (cathode) combination, whereas in the second case the wastewater was subjected to the Al (anode)-Ti (cathode) arrangement. The two cases were designed to see if the polarity direction of the chosen electrode materials affected the removal of pollutants. The removal efficiencies were computed as a ratio of the remaining concentration in the treated effluent to the concentration before treatment. It was observed that the production processes generate highly fluctuating wastewater in terms of pollution loading; for instance, 422 to 5340 Pt-Co (minimum to maximum) were recorded from color, 126 to 2264 mg/L were recorded from total dissolved solids, and 358 to 5998 mg/L from chemical oxygen demand. Also, the research results after 40 min of retention time showed that both electrode arrangements achieved relatively high removal efficiencies; Whereby, the aluminium to titanium polarity achieved up to 100% removal efficiency from turbidity while the titanium to aluminium polarity achieved a maximum of 99.95% removal efficiency from turbidty. Also, a similar phenomenon was observed from total dissolved solids; whereby, on average 0 mg/L was achieved when the wastewater was purified using the aluminium to titanium arrangement, while on average 2 mg/L was achieved from the titanium to aluminium arrangement. A little higher removal efficiency discrepancy was observed from ammonia; whereby, the aluminium to titanium arrangement outperformed the titanium to aluminium arrangement with average removal efficiencies of 82.27% and 64.11%, respectively.

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“…Nevertheless, the chemical-based coagulants were ruled inappropriate owing to the potential dangers and disastrous consequences on marine organisms [ 7 , 14 , 19 , 20 , 21 , 22 , 23 , 24 ]. Furthermore, they change the pH of the water, which might cause secondary pollution [ 25 , 26 ].The remaining aluminum particles in treated water have been connected to Alzheimer’s disease. [ 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Effect on Coagulation Treatment of Wastewater Using Magnetite Rice Starch and Aluminium Sulfate

et al. 2022

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The use of synthetic coagulants to reduce suspended particles from drinkable water and wastewater is prompting new issues because it poses many health and environmental risks. Hence, improving the coagulation process using sophisticated nanotechnology with a magnetic field (MF) for quick recoverability emerges as being useful. In this study, the effects of magnetite rice starch (MS) and aluminum sulfate (alum) were investigated at a constant dose (3 g or 3000 mg/L) using a Jar test (six beakers) as potential low-cost coagulants for industrial wastewater treatment. At a high magnification of 1000× and a surface pore size of 298 µm, scanning electron microscopy and energy dispersive X-ray (SEM/EDX) analyses were utilized to elucidate the morphology of the coagulants. Coagulation was performed at 150 rpm (quick mixing) for 2 min, and 30 rpm (slow mixing) for 15 min. Thereafter, samples were allowed to settle (10–60 min) with and without MF. The findings showed more than 65% contaminants removal (turbidity and TSS) and 30% chemical oxygen demand (COD) removal using alum while MS showed 80% contaminants removal (turbidity and TSS) and 50% COD removal. MS showed an increase of more than 3% in contaminants removal (COD, turbidity, and TSS) when exposed to MF. As a result, the use of MS together with MF in water and wastewater treatment is anticipated as an environmentally benign and effective coagulant.

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Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Cited by 8 publications

References 22 publications

Bioenergy Potential and Kinetic of Biogas Production in Anaerobic Digestion of Slaughterhouse Effluent

Bioenergy Potential and Kinetic of Biogas Production in Anaerobic Digestion of Slaughterhouse Effluent

Assessing the Influence of Electrode Polarity on the Treatment of Poultry Slaughterhouse Wastewater

Magnetic Field Effect on Coagulation Treatment of Wastewater Using Magnetite Rice Starch and Aluminium Sulfate

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