Slaughterhouse Wastewater Research Articles

Treatment of Slaughterhouse Wastewater through a Series System: Upflow Anaerobic Reactor and Artificial Wetland

Slaughterhouse wastewater is characterized by high concentrations of organic matter. This creates a need to explore methods for its treatment before discharge. This study evaluated the efficiency of an integrated treatment process consisting of a laboratory-scale upflow anaerobic sludge blanket reactor and a pilot-scale horizontal subsurface flow wetland. This treatment was used for (i) the removal of organic matter through anaerobic–aerobic microbiological processes, (ii) the conversion of organic matter from hydraulic processes, and (iii) for bioremediation and phytoremediation. The treatment system was evaluated at hydraulic retention times (HRTs) of 7.5, 5.0, and 2.5 d; during the investigation, the influence of the HRTs on the removal efficiency of the system was evaluated. High efficiencies of 85% and 75% were obtained for CODT and BOD, respectively, at an HRT of 7.5 d. The highest overall efficiency for the removal of total solids was observed at an HRT of 2.5 d. The results obtained confirm the feasibility of implementing the suggested system as an alternative for the adequate and sustainable treatment of slaughterhouse wastewater, and the system can be applied to slaughterhouses with similar conditions to those in this study.

Modeling and optimization of atmospheric CO2 capture for neutralization of high alkaline wastewaters using response surface methodology

Lab-scale stirrer bubble and lab-scale stepped continuous flow capillary columns were developed to neutralize lime precipitation treated slaughterhouse wastewater (SWW) and recover the volatilized ammonia, using atmospheric CO2. These experiments were carried out using central composite design based on the response surface methodology. The carbonation process occurred in both processes. For the bubbling process, numerical optimization indicated a final pH of 8 with calcium and ammonium nitrogen removals of 76.0 and 66.2%, respectively, applying 21 h, air flow rate at 65 L h−1, the stirring speed at 52 rpm, and SWW volume at 178 mL. It was also observed that increasing the air flow rate can avoid the stirring step. For the capillary process, a pH of 8.2 and calcium and ammonium nitrogen removals of 81.0 and 57.5% were achieved, applying a SWW flow rate at 1.2 mL min−1, air flow rate at 90 L h−1, and capillary area at 700 cm2. Under optimal conditions, the flow capillary column was able to neutralize different SWW volumes, 178–478 mL, without significant differences in the collected samples, with the operation time varying between 4.48 and 10.20 h, respectively.

Electrode material impact on microbial fuel cell and electro-Fenton systems for enhanced slaughterhouse wastewater treatment: A comparative study of graphite and titanium.

The treatment of slaughterhouse wastewater is a complex task demanding careful consideration due to its challenging nature. Therefore, exploring more sustainable treatment methods for this particular type of wastewater is of utmost significance. This research focused on the impact of electrode materials, specifically graphite and titanium, on the efficiency of microbial fuel cells (MFCs) and electro-Fenton systems in treating slaughterhouse wastewater. Both graphite and titanium electrodes displayed increasing current density trends, with titanium outperforming graphite. Titanium showed superior electron transfer and current generation (2.2 to 21.2 mA/m2 ), while graphite ranged from 2.4 to 18.9mA/m2 . Titanium consistently exhibited higher power density, indicating better efficiency in converting current to power (0.059 to 22.68 mW/m2 ), compared to graphite (0.059 to 12.25 mW/m2 ) over the 48-h period. In removal efficiency within the MFC system alone, titanium exhibited superior performance over graphite in key parameters, including zinc (45.5% vs. 37.19%), total hardness (39.32% vs. 29.4%), and nitrates (66.87% vs. 55.8%). For the electro-Fenton system with a graphite electrode, the removal efficiency ranged from 34.1% to 87.5%, with an average efficiency of approximately 56.2%. This variability underscores fluctuations in the efficacy of the graphite electrode across diverse wastewater treatment scenarios. On the other hand, the electro-Fenton system employing a titanium electrode showed removal efficiency values ranging from 26.53% to 89.99%, with an average efficiency of about 68.4%. The titanium electrode exhibits both a comparatively higher and more consistent removal efficiency across the evaluated scenarios. On the other hand, the integrated system achieved more than 90% removal efficiency from most of the parameters. The study underscores the intricate nature of slaughterhouse wastewater treatment, emphasizing the need for sustainable approaches. PRACTITIONER POINTS: Microbial fuel cell (MFC) and electro-Fenton were investigated for slaughterhouse wastewater treatment. The MFC microbial activity started to decrease after 24 h. The integrated system achieved up to 99.8% removal efficiency (RE) for total coliform bacteria. Up to 99.4% of RE was also achieved for total suspended solids (TSS). The integrated system highly improved RE of the pollutants.

Susceptibility of some Enterobacteriaceae isolated from 4 different aquatic environments in DR Congo (Central Africa), to Amoxicillin/Clavulanic acid and some 3rd generation Cephalosporins

Little is known about the variation of the antibiotic susceptibility of different bacterial strains of the same cells species, isolated from different aquatic environments. The present study aims to evaluate the susceptibility towards some 3rd generation cephalosporins (Ceftriaxon, Ceftazidim and Cefotaxim) and Amoxicillin/Clavulanic acid, of Enterobacteriaceae strains isolated from groundwater, stream, hospital wastewater and slaughterhouse wastewater. Enterobacteria species were isolated on Mac Conkey agar, then identified using enzymatic and MALDI-TOF MS system. The antimicrobial susceptibility was carried out using the disk diffusion method. The antibiotic minimum inhibitory concentrations (MICs) were carried using the VITEK®2 system. Bacterial species mostly identified were Klebsiella pneumoniae, Escherichia coli, Salmonella typhi and Ewingelia americana. The antibiotic inhibition diameters and the MICs varied depending on the antibiotics, bacterial species and type of aquatic environment hosting the microorganism. Relatively lower MICs were recorded with Cefotaxim against different bacteria in slaughterhouse wastewater, in river water and in well water. Antibiotic resistance was noted with all strains from hospital wastewater. Significant differences (P˂0.05) amongst antibiotic inhibition diameter was noted for K. pneumoniae and S. typhi in most cases. The relative variations in the action mechanisms amongst antibiotics and the intrinsic defense potential of each bacterial strain, as well as the potential influence of the physicochemical properties of each water medium, could partly be at the origin of the relative differences observed at the phenotypic level. It seems necessary to explore the diversity, similarities and differences amongst antibiotic resistance genes in these different types of aquatic biotopes.

Intelligent algorithms-aided modeling and optimization of the deturbidization of abattoir wastewater by electrocoagulation using aluminium electrodes

The removal of turbidity from abattoir wastewater (AWW) by electrocoagulation (EC) was modeled and optimized using Artificial Intelligence (AI) algorithms. Artificial neural networks (ANN), adaptive neuro-fuzzy inference systems (ANFIS), particle swarm optimization (PSO), and genetic algorithms (GA) were the AI tools employed. Five input variables were considered: pH, current intensity, electrolysis time, settling time, and temperature. The ANN model was evaluated using the Levenberg-Marquardt (trainlm) algorithm, while the ANFIS modeling was accomplished using the Sugeno-type FIS. The ANN and ANFIS models demonstrated linear adequacy with the experimental data, with an R2 value of 0.9993 in both cases. The corresponding statistical error indices were RMSE (ANN = 5.65685E-05; ANFIS = 2.82843E-05), SSE (ANN = 1.60E-07; ANFIS = 3.4E-08), and MSE (ANN = 3.2E-09; ANFIS = 8E-10). The error indices revealed that the ANFIS model had the least performance error and is considered the most reliable of the two. The process optimization performed with GA and PSO considered turbidity removal efficiency, energy requirement, and electrode material loss. An optimal turbidity removal efficiency of 99.39 % was predicted at pH (3.1), current intensity (2 A), electrolysis time (20 min), settling time (50 min), and operating temperature (50 °C). This represents a potential for the delivery of cleaner water without the use of chemicals. The estimated power consumption and the theoretical mass of the aluminium electrode dissolved at the optimum condition were 293.33 kW h/m3 and 0.2237 g, respectively. The work successfully affirmed the effectiveness of the EC process in the removal of finely divided suspended particles from AWW and demonstrated the suitability of the AI algorithms in the modeling and optimization of the process.

Evaluation of Selected Operating Process Variables for a Bioflocculant Supported Column Flotation System

The poultry industry generates significant volumes of slaughterhouse wastewater, laden with numerous pollutants, thus requiring pretreatment prior to discharge. However, new technologies must be used to re-engineer the existing wastewater treatment equipment and incorporate new designs to improve the treatment processes or system performance. In this study, three variables, i.e., diffuser design, bioflocculant form, and flow rate, were evaluated to determine their effect on the performance of a bioflocculant-supported column flotation (BioCF) system. It was found that bioflocculants influenced diffuser performance with limited impact when the feed flow rate was varied, i.e., 3D-printed air diffusers and cell-free flocculants imparted high BioCF performance when compared to moulded diffusers and cell-bound flocculants. Notably, the combination of 3D-printed air diffusers and cell-free flocculants resulted in relatively high pollutant removal (81.23% COD, 94.44% TSS, 97.77% protein, and 90.38% turbidity reduction). The study lays a foundation for exploring 3D-printed air diffusers, a relatively new technology in conjunction with microbial flocculants usage that are regarded as eco-friendly for application in industry to enhance the performance of column flotation systems.

Effects of abattoir wastewater on the growth of <i>Solanum lycopersicum</i> L. (tomato)

With the growing necessity to use wastewater for irrigation due to water scarcity, farmers face the challenge of using wastewater containing non-profiled nutrients that may be detrimental to crop productivity. The study investigated the effects of water from abattoirs on tomato plant growth and development. Abattoir wastewater (AWW) was obtained from Surulere and Agege abattoirs in Lagos State. The experimental design implemented a randomized complete design (RCD) with three replications. Tomato plants were grown in experimental pots and treated with different amounts of AWW: Tap water (control), 20, 40, 60, 80, and 100%. Data on plant height, branch and leaf numbers, fruit yield, stem girth, and root length, were collected at two-week intervals for five months. Data was subjected to analysis of variance (ANOVA), and the means were separated using the Tukey HSD test at a threshold of 5% (P<0.05). The study revealed that AWW significantly increased tomato growth characteristics and fruit yield at 100% AWW concentration. Thus, AWW may be an alternative source of organic nutrients for vegetable crop irrigation and could assist farmers with the escalating issues of freshwater scarcity and drought challenges worldwide.

Enhancing slaughterhouse wastewater treatment through the integration of microbial fuel cell and Electro-Fenton systems: A comprehensive comparative analysis

This research examined the viability of combining the Microbial Fuel Cell (MFC) and Electro-Fenton (EF) system to treat slaughterhouse wastewater. The study compared three different setups: the first utilizing only the MFC, the second employing solely EF, and the third integrating both systems for wastewater treatment (MFC and EF). In the case of Microbial Fuel Cell treatment, notable removal efficiencies were observed, including 58.8 % for turbidity, 41.2 % for color, 69.9 % for chemical oxygen demand, 72.2 % for biochemical oxygen demand, and 69.9 % for total coliform bacteria. EF treatment demonstrated substantial Removal efficiencies of 72.5 % for turbidity, 81.6 % for Chemical Oxygen Demand (COD), 86.5 % for biochemical oxygen demand, and 84.3 % for Escherichia coli (E. coli) bacteria. Integrated treatment yielded exceptional Removal efficiencies of 98.9 % for turbidity, 95.5 % for chemical oxygen demand, 95.4 % for biochemical oxygen demand, and 100 % for E. coli bacteria. After computing water quality indices, it was found that raw wastewater had an extremely high water quality index (1.087 × 1012), indicating severe pollution. Despite lower water quality indices from MFC and EF treatments, the water remained unsuitable for drinking. Integrated treatment significantly reduced the water quality index (1.67 × 104), indicating enhanced water quality, though it remained non-potable.

Wastewater and environmental sampling holds potential for antimicrobial resistance surveillance in food-producing animals - a pilot study in South African abattoirs.

Antimicrobial resistance (AMR) poses a significant global One Health challenge that causes increased mortality and a high financial burden. Animal production contributes to AMR, as more than half of antimicrobials are used in food-producing animals globally. There is a growing body of literature on AMR in food-producing animals in African countries, but the surveillance practices across countries vary considerably. This pilot study aims to explore the potential of wastewater and environmental surveillance (WES) of AMR and its extension to the veterinary field. Floor drainage swab (n = 18, 3/abattoir) and wastewater (n = 16, 2-3/abattoir) samples were collected from six South African abattoirs that handle various animal species, including cattle, sheep, pig, and poultry. The samples were tested for Extended-Spectrum Beta-Lactamase (ESBL) and Carbapenemase-producing Enterobacterales, Methicillin-Resistant Staphylococcus aureus (MRSA), Vancomycin-resistant Enterococci (VRE), and Candida auris by using selective culturing and MALDI-TOF MS identification. The phenotype of all presumptive ESBL-producing Escherichia coli (n = 60) and Klebsiella pneumoniae (n = 24) isolates was confirmed with a disk diffusion test, and a subset (15 and 6 isolates, respectively), were further characterized by whole-genome sequencing. In total, 314 isolates (0-12 isolates/sample) withstood MALDI-TOF MS, from which 37 species were identified, E. coli and K. pneumoniae among the most abundant. Most E. coli (n = 48/60; 80%) and all K. pneumoniae isolates were recovered from the floor drainage samples, while 21 presumptive carbapenem-resistant Acinetobacter spp. isolates were isolated equally from floor drainage and wastewater samples. MRSA, VRE, or C. auris were not found. All characterized E. coli and K. pneumoniae isolates represented ESBL-phenotype. Genomic analyses revealed multiple sequence types (ST) of E. coli (n = 10) and K. pneumoniae (n = 5), including STs associated with food-producing animals globally, such as E. coli ST48 and ST10 and K. pneumoniae ST101. Common beta-lactamases linked to food-producing animals, such as bla CTX-M-55 and bla CTX-M-15, were detected. The presence of food-production-animal-associated ESBL-gene-carrying E. coli and K. pneumoniae in an abattoir environment and wastewater indicates the potential of WES in the surveillance of AMR in food-producing animals. Furthermore, the results of this pilot study encourage studying the topic further with refined methodologies.

Integrated Hydrogen Peroxide, Sono, and Heterogeneous Photocatalysis Technologies: A Novel Technique for Ammonia and Phosphorus Removal in Real Poultry Slaughterhouse Wastewater

Integrated Hydrogen Peroxide, Sono, and Heterogeneous Photocatalysis Technologies: A Novel Technique for Ammonia and Phosphorus Removal in Real Poultry Slaughterhouse Wastewater

Mathematical modeling to size anaerobic stabilization ponds intended for slaughterhouse wastewater treatment – the role of temperature and hydraulic retention time

A new mathematical model for constructing anaerobic stabilization pond treatment systems for high organic load wastewater, based on biochemical oxygen demand, temperature and hydraulic retention time, is discussed.

Investigation Removal Efficiency of Electrocoagulation Process as A Slaughterhouse Wastewater Treatment Technique: Toxicity Assessment

Investigation Removal Efficiency of Electrocoagulation Process as A Slaughterhouse Wastewater Treatment Technique: Toxicity Assessment

Microbiological Assessment and Antibiotic Susceptibility of Orogodo River Exposed to Abattoir Effluent in Delta State, Nigeria

The content of abattoir effluent and its receiving water body, Orogodo River in Agbor, Delta State. Total heterotrophic and coliform counts were assessed using standard microbiological techniques. The viable heterotrophic bacteria count for the rainy season ranges from 7.7x105-4.6x104cfu/ml. Total coliform counts 2.6x105 -3.4x104 MPN/ml respectively. A total of 11 bacteria were isolated, antibiotic susceptibility pattern of bacteria was determined using the disk diffusion method. Five out of the bacteria isolates were resistant to at least four antibiotics. Out of all the antibiotics used 90 isolates were susceptible to erythromycin, 5% were resistant, also, 85 were susceptible to ofloxacin with 5% resistance and 10% were intermediate. Ampicillin had the highest resistance of 40%. The Molecular identification of multiple antibiotic-resistant bacteria was carried out using a 16S rRNA gene sequence. The identified bacteria include Shigella flexneri, Enterobacter hormaechei, Proteus vulgarus, Morganella morganii, and Pseudomonas oryzae. Data were statistically analyzed to determine the level of significance. The microbial population of bacteria isolated was found to be higher in the abattoir wastewater sample 7.7x105 and the point of entry sites 4.0x105 when compared to the downstream and upstream sample stations. The high microbial load and presence of multiple antibiotic-resistant bacteria in the river water is alarming and can lead to public health risks when such water is consumed or used for cleaning meat during processing. There is a need for proper management of abattoir waste, An on-site pretreatment strategy (collection of waste, treatment, processing, anaerobic digestion, and safe disposal) is highly recommended and should be enforced by relevant authority to safeguard the environment and the populace that depend on the Orogodo river water.

Wastewater management from municipal slaughterhouses in Mexico: quantities produced, existing legislation, treatment processes applied and future challenges

Wastewater from municipal slaughterhouses remains a persistent issue in the world, owing to its inherent characteristics it has been categorized as one of the most environmentally detrimental water sources. Mexico has 972 registered facilities dedicated to meat processing, so it is necessary to establish the best treatment options in order to achieve efficient control of the wastewater produced, reduce water consumption and enhance the utilization of natural resources. The objective of this study was to estimate the quantities of municipal slaughterhouse wastewater produced in Mexico and to provide information on the legislation applicable to the disposal and discharge of these effluents. It also presents the nature-based solutions that could be applied and that are technically and economically feasible, as well as future opportunities for the sustainable management of this type of wastewater. The state of Jalisco is the largest generator of wastewater and solid waste in the country, and significant progress has been made in the transition of public policies toward a sustainability model nationwide. These advancements are supported by legal foundations, institutional frameworks, and governmental bodies. The competitive advantages of nature-based solutions such as constructed wetlands over other treatment technologies include low operation and maintenance costs, ease of implementation, low energy consumption, and the fact that they are not harmful to nature and receiving bodies. While significant progress has been made in the management and sanitation of slaughterhouse wastewater, challenges persist with regard to the technologies employed (design and operation parameters, scaling up, biochemical processes involved, etc.) which in turn become excellent areas of opportunity for future research.

Efficiency of Some Chemical Reagents with Ultrafiltration System in the treatment of Abattoir Wastewater

The study seeks to evaluate the concentration of some toxicants in abattoir wastewater prior to treatment and after treatment using ultrafiltration system. Samples of water were gathered from the reservoir of wastewater in the Gwagwalada abattoir, Abuja, Nigeria without treatment and labelled S1. Some of the water was subjected to treatment using Chlorine + Alum + Lime (S2), another with Chlorine + Alum + Lime + Activated carbon (S3). Physico-chemical parameters such as: pH, colour, nitrates etc. were analyzed. Trace metals (Zn, Cu, Fe, Pb, Mn, Ni, Co and Cd) levels in the water samples were investigated using Atomic Absorption Spectrophotometer (AAS). Concentration of pesticide residues (μg/L), antibiotics and bacterial growth were also evaluated. The S1, S2 and S3 nitrate concentrations were 271.20, 22.40 and 26.57 mg/L respectively. Level of Zinc, Copper and Lead in the trio samples investigated were within the range 0.14 to 0.24 mg/L, 0.15 to 0.24 mg/L and 0.06 to 0.17 mg/L respectively. Dichlorvos, Lambda-cyhalothrin and Chlorpyrifos were found in the 3 water samples in varying concentration. Only sample S1 shows microbial growth of Salmonella spp., Escherichia coli, Pseudomonas spp., and Shigella spp. at 52.00 ± 8.49, 58.00±31.11, >100 and 10.50 ±0.71 CFU/100ml respectively. In S1, 0.05 μg/L of oxytetracycline and 0.34 μg/ of levofloxacin were found. This study has shown that treating wastewater from the abattoir using ultrafiltration method with some reagents such as Chlorine, Alum, Lime and Activated Carbon can help in removing toxicants and purify it before releasing it into the environment.

Health Risks Associated with the Concentration of Heavy Metals in Sediment, Water, and Carp Reared in Treated Wastewater from a Slaughterhouse

The use of purified slaughterhouse wastewater in carp ponds, and the use of wastewater from the pond for the irrigation of agricultural fields, was the basis for the construction of an integrated system of agricultural production as a sustainable solution for the food and fish production industries. The negative side of such integrated production systems is the concern related to the safety of fish meat produced in such a system. The aim of this research was to determine the concentration of heavy metals and metalloids in the wastewater from the slaughterhouse, in the pond water and sediment, in the carp tissue and in the water leaving the pond, and to evaluate the effectiveness of the integrated system and the safety of the produced fish. Sampling was carried out in spring and autumn. The mean concentrations in all water samples (µg/L) were: As (12–125), Cd (0.12–4.2), Hg (1.14–14.21), Pb (<0.1–17.2), Cu (<0.1–44.6), Fe (17.02–425.2) and Zn (2.91–186.2), with the highest numbers in the wastewater, where it was above the prescribed limit values for the wastewater discharged from the slaughterhouses into natural recipients in both samplings. The efficiency of the wastewater treatment plant for heavy metals and metalloids was very high, in the range of 87% to 98%. The water from the pond corresponded to class 3 in terms of the concentration of heavy metals and metalloids both in spring and autumn, and can be used freely for breeding cyprinid fish species. The water from the irrigation canal corresponded to class 2/3 and can be used for irrigation. The mean concentrations of heavy metals and metalloids in the sediments (mg/kg) were: As (3.00–4.88), Cd (0.16–0.96), Hg (0.21–1.47), Pb (0.77–2.29), Cu (49.60–60.90), Fe (3.94–5.32) and Zn (92.8–115.20). The content of heavy metals in different organs of carp differed significantly depending on the season. The trend of heavy metal accumulation in common carp muscles in spring was: Zn > Fe > Cu > Pb > Hg > Cd > As, and in autumn: Zn > Fe > Cu > Pb > As > Cd > Hg. Metal concentrations in the examined fish samples were far below the WHO guidelines. It can be concluded that carp produced in a pond supplied with purified wastewater from the slaughterhouse industry, in terms of the concentration of residues of the tested heavy metals and metalloids, is safe for human consumption.

Economic and environmental assessment of a biogas-based pressurized grid in a livestock farm: A case study in a cuban context

The present study reports on the quantification of the economic feasibility and environmental sustainability potential of a biogas-based pressurized grid on a rural livestock farm in Cuba. Three different grids (Grid 1: Niña Bonita, Grid 2: Sabanilla, and Grid 3: Dos Ríos) were evaluated, with the main differences between them being the number of anaerobic digesters and the substrates to be managed. For this purpose, the economic evaluation was carried out based on the cost of the equipment. In addition, the Life Cycle Assessment (LCA) method was used to obtain the environmental profile of the whole system and each grid. The cost analysis included the monetization of cost savings derived from the monetization of fertilizer and energy sources. The selected functional unit was the 10 kg chemical oxygen demand (COD) in livestock manure and slaughterhouse wastewater. The results show the need for grid interconnection to balance biogas production and consumption. The proposed model demonstrates the economic feasibility of the biogas-based pressurized grid, with a payback period, internal rate of return (IRR), and net present value (NPV) of 4.6 years, 38%, and $2 188 993.08, respectively. Studies confirm that the price of digestate is critical to the economics of the process, with a high sensitivity to project profitability. From an environmental point of view, Grid 2 performed the worst, mainly due to CO2 and N2O emissions (mainly in the lagooning process). However, the current grid supports the diversion of lagooning effluent for the irrigation of nearby fodder crops. In addition, the sensitivity analysis showed that the increase in the number of cattle (doubling) is crucial for the improvement of the environmental profile. Its variation proved that the substitution of fossil-based electricity can be considered a solution to reduce the environmental burden with bioenergy.

Isolation and Identification of Antibiotic-Susceptible Bacteria from Abattoir Effluent in Port Harcourt, Rivers State, Nigeria

Abattoir environment can become a significant reservoir for antibiotic resistance bacteria, particularly in abattoirs that do not treat their waste before discharge. This study seeks to verify the antibiotics susceptibility profile of bacteria isolated from abattoir wastewater in Port Harcourt, River State, Nigeria. The bacteria were isolated from the wastewater using a standard plating technique. The antibiotics sensitivity pattern of all bacterial isolates was determined by the Kirby-Bauer disk diffusion method. Isolates with high multiple antibiotic resistance (MAR) index (≥0.5) were screened for genes for pathogenicity (icaC, adhesion gene) and antibiotic resistance (QnrA gene). The abattoir wastewaters were contaminated by bacteria resistant to no less than two of the antibiotics experimented with (MAR index range, 0.2-1.0). The isolates were identified as Acinetobacter brisouii, Bacillus altitudinis, Bacillus stratosphericus and Priestia flexa. Among these isolates, 2(50.0%) harboured the QnrA gene while 3(75.0%) harboured the icaC gene. The findings underscore the importance of abattoir wastewater as an environmental flashpoint for antibiotic resistance. Detection of bacteria with multiple antibiotic resistance in abattoir wastewater would inform cautious use of antibiotics, to check the spread of antibiotic resistance emanating from this source.

Electrocoagulation Technique for Treating Swine Slaughterhouse Wastewater from Batch to Semicontinuous Operation Mode

In this study, industrial swine slaughterhouse wastewater was treated by electrocoagulation process using batch and semicontinuous operation systems. Electrochemical technique was carried out in batch operation mode during 2.5 h applying different current densities in sulfate and chloride media. After finding the best operating parameters in batch mode (lab-scale), the process was transferred to a semicontinuous pre-pilot scale process using a filter-press FM01-LC type electrochemical reactor fitted with flat plate aluminum electrodes. In this stage, distinct current densities and mean linear flow rates were assessed.Total organic carbon, chemical oxygen demand, total phosphorus, total nitrogen, and potassium among other parameters were analyzed during both treatments. The industrial swine slaughterhouse wastewater contained TOC 333 mg L–1, COD 1765 mg L–1, TP 13.55 mg L–1, TN 327 mg L–1, K 45 mg L–1, turbidity 102 NTU, color –absorbance 0.90 A.U. at 415 nm–, conductivity 1.9 mS cm–1, and pH 6.9. The highest TOC removal efficiency (72.7%), in semicontinuous process, was found at j = 25 mA cm-2 and ur = 0.64 cm s-1 with an energy consumption of 19.80 kW h m-3. Residual COD and TP concentrations met the international standard limits. Moreover, complete discoloration and disinfection were achieved. EDXRF, SEM, EDAX, XRD, and FTIR analyzes indicate pollutants were removed by adsorption on aluminum/iron hydroxides/oxyhydroxides.

Advanced oxidation processes: a supplementary treatment option for recalcitrant organic pollutants in Abattoir wastewater

Animal production and meat processing generate large amounts of waste. Large amount of water containing substantial quantities of biodegradable organic matter are produced as a result of the slaughtering of animals and the routine washing of leftover particles in the abattoir. Blood, fats, oil, and grease, undigested food, suspended materials, etc. are a few examples of the materials that typically contributed organic load to these effluents. Thus, regulatory agencies prohibit the direct discharge of the effluents and solid abattoir wastes into the environment. This is because these wastes are potential pollutants and can increase harmful ecological hazards, therefore, treatment is required before discharge into environment. The advanced oxidation processes (AOPs), a tertiary water treatment method is based on the production of hydroxyl radicals, which brings about its non-selective reaction with water contaminants, allowing mineralization of contaminants and converting them into CO2 and water. AOPs could be applied to oxidize pollutants in abattoir wastewater (AWW), and may be used as a supplementary treatment system. A combined process involving the physical and biological treatments, and AOPs may be used as an alternate form of treatment with the potential for greater effectiveness and dependability. However, the properties of the wastewater, treatment time, influent concentration, type of treatment, and the best treatment technique currently available to comply with the standards will all have a significant impact on treatment efficiencies of AWW.