Yusuf Momoh | University of Port Harcourt, Nigeria (original) (raw)

Papers by Yusuf Momoh

Journal of Scientific Research and Reports, Oct 25, 2019

Particle pollution poses serious public health concern because of its potential to find its route... more Particle pollution poses serious public health concern because of its potential to find its route into human lungs thereby causing respiratory diseases and cancer. This paper analyses various aspect of particulate matter including seasonal variation, Particulate matter based AQI, particulate matter exceedances and empirical modelling for seasonal prediction of PM 2.5 and PM 10 concentration. The study was carried out in Woji, a residential urban area of Port Harcourt, Nigeria, between May and December 2018. The Particulate matter concentrations were monitored with particulate monitor while meteorological variables were also monitored with Misol weather station. The 24-hour average PM 10 concentration for dry and wet seasons were 139.6 μg/m³ and 97 μg/m³ respectively. These concentrations are below USEPA 24-hr standard (PM 10 = 150 μg/m³) while the 24-hour average PM 2.5 concentrations of 46.1μg/m³ for dry season exceeded daily limit (PM 2.5 = 35 μg/m³) but was below the limit in wet season with concentration of 29.1 μg/m³. The study area experienced daily PM 2.5 and PM 10 exceedances of 33.3% and 19.7% respectively for the study period. Also, the Original Research Article

International Journal of Advanced Engineering Research and Science

Abattoir wastes which are wastes generated during the various operations that are aimed at proces... more Abattoir wastes which are wastes generated during the various operations that are aimed at processing for consumption categorized as solid, liquid or gaseous have the potential to pollute the environment. They are stages in the abattoir operations and the adequacy of the operations is key to healthy products and environment. This study reviews thehandlingstages in an abattoir from animal arrival and temporary storage, stunning/Immobilising, slaughtering/bleeding, skinning, evisceration and Splitting to the roasting and washing operations. The waste handling point was noted to be categorized as solid which consist mainly of bone and compostable material, Liquid waste which include wash water, intestinal fluid and blood and the gaseous waste that includes emission due to the use of fuel for roasting of skin which is used in meals in parts of West Africa. Research on the alternative use of waste from the various abattoir wastes has been suggested in the study. The application of liquid waste and the part of solid waste for biogas production and purification (using charred bone) and deploying of the biogas as fuel for the roasting operation.

Asian Journal of Advanced Research and Reports

Particulate matter pollution poses serious health concern to public health in Nigeria especially ... more Particulate matter pollution poses serious health concern to public health in Nigeria especially at elevated concentration. Its size is very vital in determination of its long stay in the atmosphere as well as its deposition in human respiratory system. This study analyzes the temporal variation of particulate matter (PM10 and PM2.5) concentrations and its ratio in urban area of Port Harcourt. The study was carried out in Woji, area of Port Harcourt, Nigeria, from May to December 2018 using Aerocet 531 particulate monitor while meteorological variables were monitored via Misol wireless weather station mounted 10 m above the ground level. The highest particle pollution occurred in the month of December with an average daily PM2.5 concentration of 58.8 μgm-3 and PM10 concentration of 164.5 μgm-3, which exceeds WHO and USEPA daily threshold. These particle pollution exceedances recorded the dry season month of December was due to high atmospheric stability with dry dusty north east tra...

... University of Alabama, Tuscaloosa, AL 35487-0205. ... This information is being collected and... more ... University of Alabama, Tuscaloosa, AL 35487-0205. ... This information is being collected and evaluated by Celina Bochis as part of her MSCE thesis in the Department of Civil and Environmental Engineering, at the University of Alabama, Tuscaloosa, AL 35487-0205. ...

The application of a set of simplified anaerobic digestion models (SADM's) to describe the anaero... more The application of a set of simplified anaerobic digestion models (SADM's) to describe the anaerobic biodegradability and kinetics of cow manure at ambient temperature was conducted in this study. It was observed that the Hill's based biogas yield rate model was the most appropriate in describing biogas yield rate from cow manure. Parameter estimation revealed that the half saturation constant expressed as acidified substrate and volatile solids (VS) equivalent were 0.163g/l and 21.9g VS/l respectively while the maximum biogas yield rate was estimated to be 1.957ml/g VS/day. The coefficient of acidogenic bacteria adaptation (n) and coefficient of acetogenic/methanogenic bacterial cooperativity (m) were estimated to be 1.28 and 0.65 respectively. The poor cooperativity amongst the acetogenic/methanogenic bacterial species can be attributed to poor adaptation, possibly due to interaction between ammonia and volatile fatty acids. In addition, the biodegradability and recalcitrance was estimated to be 0.42 and 0.433 respectively, while hydrolysis/acidogenesis was identified as the rate limiting step. Application of Simplified Anaerobic Digestion Models (SADM's) for Studying the Biodegradability and… Yusuf O.L. MOMOH and Benedict ANYATA 24

Based on preliminary investigations under controlled conditions of drying experiments, a direct n... more Based on preliminary investigations under controlled conditions of drying experiments, a direct natural convection solar dryer was designed and fabricated to dry tapioca in the rural area. This paper describes the design considerations followed and presents the results of MS excel computed results of the design parameters. A minimum of 7.56 m 2 solar collector area is required to dry a batch of 100 kg tapioca in 20 hours (two days drying period). The initial and final moisture content considered were 79 % and 10 % wet basis, respectively. The average ambient conditions are 32ºC air temperatures and 74 % relative humidity with daily global solar radiation incident on horizontal surface of 13 MJ/m 2 /day. The weather conditions considered are of Warri (lat. 5°30', long. 5°41'), Nigeria. A prototype of the dryer so designed was fabricated with minimum collector area of 1.08 m 2 .

Ambient temperature kinetic assessment of biogas production from co-digestion of horse and cow du... more Ambient temperature kinetic assessment of biogas production from co-digestion of horse and cow dung. Res. Agr. Eng., 57: 97-104. Biogas production from 5 batch digesters containing varying ratio of mix of horse and cow dung was studied for a period of 30 days at ambient temperature. It was observed that biogas production was optimized when horse and cow dung were mixed in a ratio of 3:1. The modified Gompertz equation was used to adequately describe the cumulative biogas production from these digesters. In addition, a modified first order model was developed to assess the kinetics of the biodegradation process. It was observed that the rates of substrate biodegradability and of removal of the biodegradable fractions of the substrate could be obtained by plotting 1/t (ln(dyt/dt)) against the inverse of time of digestion. This modified first order model also showed that the digester containing horse dung and cow dung in the ratio of 3:1 had the highest short term anaerobic biodegradability index (STABI) of 3.96 at room temperature.

Journal of Applied Sciences and Environmental Management, 2010

The effect of waste paper on biogas production from the co-digestion of fixed amount of cow dung ... more The effect of waste paper on biogas production from the co-digestion of fixed amount of cow dung and water hyacinth was studied at room temperature in five batch reactor for over 60 days. Waste paper addition was varied for a fixed amount of cow dung and water hyacinth until maximum biogas production was achieved. Biogas production was measured indirectly by water displacement method. The production of biogas showed a parabolic relationship as the amount of waste paper (g) increased with a goodness of fit of 0.982. Maximum biogas volume of 1.11liters was observed at a waste paper amount of 17.5g which corresponded to 10.0% total solids of the biomass in 250ml solution. Thus, an optimum waste paper amount of 17.5g needs to combine with 5g of cow dung and 5g of water hyacinth in 250ml of water for maximum biogas production. Similar equivalents in kilograms and tonnes can be utilized in large-scale production of biogas which can provide decentralized source of fuel for university laboratories and also local supply of energy for electricity production. Also, the air pollution problems associated with open burning of waste papers can be eliminated. The biogas process has established to be cheap and practically feasible. @ JASEM

Journal of Environmental Science and Health, Part A, 2003

The effect of water hyacinth on the remediation of crude oil contaminated soil was studied ex-sit... more The effect of water hyacinth on the remediation of crude oil contaminated soil was studied ex-situ for 1.5, 3.0 and 4.5% crude oil contaminated soil (Heavy Crude) obtained from the Niger Delta region. The volume of the different percentages of crude oil contamination was equivalent to 3.17, 6.35 and 9.70l/m 2 of land area respectively. The remediation process was followed by monitoring the THC of the soil with time on 16 cells. After a period of 10 weeks, bean seeds were planted on the remediated soil to observe if these various cells would sustain plant growth for the first 15 days. Results obtained were analysed with a 2-Factor Analysis of Variance Excel tool for data analysis. The effect of water hyacinth on the remediation process had P-values greater than 0.05 at 1.5 and 3% which indicated that water hyacinth application may not be necessary for remediating crude oil contaminated soil at 1 and 3%. However, the P-value less than 0.05 for crude oil contaminated soil at 4.5% which indicated that the water hyacinth may be necessary for remediating crude oil contaminated soil above 3 -4.5%. Also, the time effect of the remediation process had P-value less than 0.05 for 1.5, 3.0 and 4.5% crude oil contamination signifying that the time factor play important role in the remediation process. _____________________________________________________________________________________________

Journal of Biochemical Technology, 2011

... Env Sc Tech 41:8154-8158 Ghangrekar MM, Shinde VB (2007) Performance of membrane-less microbi... more ... Env Sc Tech 41:8154-8158 Ghangrekar MM, Shinde VB (2007) Performance of membrane-less microbial fuel cell treating wastewater and effect ... Wat R 39(9):1675-1686 Venkata MS, Raghavulu VS, Srikanth S et al (2007) Bioelectricity production by mediatorless microbial fuel ...

Journal of Applied Sciences and Environmental …, 2010

... Sci. Technol, 41, 8154-8158. Ghangrekar, MM; Shinde, VB (2007). ... Water Res 39(9) 1675-1686... more ... Sci. Technol, 41, 8154-8158. Ghangrekar, MM; Shinde, VB (2007). ... Water Res 39(9) 1675-1686. 26 Page 7. Generation of Electricity???.. MOMOH, OLY; NEAYOR, B ,Mohan VS; Raghavulu, VS;Srikanth S; Sarma, PN (2007), Bioelectricity production by mediatorless microbial ...

Biochemical Engineering Journal, 2013

The anaerobic co-digestion of cow manure and waste paper at ambient temperature condition was obs... more The anaerobic co-digestion of cow manure and waste paper at ambient temperature condition was observed to be optimized at a mix proportion of 75:25 respectively. The development and testing of a set of simplified anaerobic digestion models (SADM's) for this mixture revealed that the Hill's based biogas yield rate model was most appropriate in describing the kinetics of biogas production. Parameter estimation using non-linear regression revealed that the half saturation constants expressed as acidified substrate and volatile solids equivalents were 0.228 g/L and 5.340 g VS/L respectively, and the maximum specific biogas yield rate and biodegradability were 2.2 mL/g VS/day and 0.313 respectively. The coefficients "n" and "m" indicative of acidogenic bacterial adaptation for degradation and acetogenic/methanogenic bacterial cooperativity were estimated to be 1.360 and 2.738 respectively, while hydrolysis/acidogenesis was considered the rate limiting step. The need of bacterial adaptation may be an important factor to consider during anaerobic modeling of complex biomass.

The hydrolytic step is usually considered the rate limiting step in the biological conversion of ... more The hydrolytic step is usually considered the rate limiting step in the biological conversion of ligno-cellulose material into biofuels. Current optimization approach attempts to understand the mechanism of hydrolysis in order to boost production. In this study, the development and testing of a surface-based and a water-based-diffusion kinetic model for modeling biogas production from cow manure was conducted using total solid (TS) loading ranging from 8 to 10% (TS) in batch reactors. Parameter estimation using solver function of the Microsoft Excel Tool Pak revealed that, the second order water diffusion model was superior in predicting biogas production with correlation coefficients ranging from 0.9977 to 0.9995. In addition, the initial surface permeability flux of water (K spf 0) into the organic biomass and fragmentation of particles were observed to be independent events elicited by the action C 1 and C x factors respectively. The initial surface permeability flux of water was observed to increase as solids concentration increased from 8 to 9%TS while, fragmentation constants decreased. Maximum initial surface permeability flux of water (1.78E-05 m 3 /m 2 /day) was observed at 9% (TS) with a simultaneous minimization in the fragmentation rate (0.13/day). For optimal production of biofuels, appropriate quantity of C 1-factor, the degree of crystallinity and particle size may be critical for efficient conversion.

Previously, the capture of suspended particulate matter focused on the total suspended particulat... more Previously, the capture of suspended particulate matter focused on the total suspended particulate matter, until recent research into the health impacts of suspended particulate matter suggests that minute particles that have toxic substances adsorbed onto their surface are insidious and deleterious for human health and vegetation. The Inhalable fraction and respirable fraction were captured between the month of May 2009 to October 2009 using SKC Air Check Gravimetric Sampler-Model 210-5000 serial No. 20537 and respirable foam for I.O.M sampler. The elemental composition (Co, Ni, Zn, Cu, Fe, Pb, Cr, Mn and Cd) were analyzed by using Atomic Absorption Spectrophotometric (AAS). The data generated were subjected to descriptive analysis. In inhalable fraction,the enrichment factor ranged from 1-73.3 while in respirable ,it was 1-72.9.Lead had the highest mean concentration in both inhalable and respirable fraction. From the enrichment factor Cd was highly enriched while Pb was moderately enriched. Co and Ni were below detection limit in both inhalable and respirable suspended particulate matter. ©JASEM

Biomass & Bioenergy, 2011

Ultimate methane yield First order kinetics Waste paper a b s t r a c t

Anaerobic digestion is the most successful bioenergy technology worldwide with, at its core, unde... more Anaerobic digestion is the most successful bioenergy technology worldwide with, at its core, undefined microbial communities that have poorly understood dynamics. Here, we investigated the relationships of bacterial community structure (>400,000 16S rRNA gene sequences for 112 samples) with function (i.e., bioreactor performance) and environment (i.e., operating conditions) in a yearlong monthly time series of nine full-scale bioreactor facilities treating brewery wastewater (>20,000 measurements). Each of the nine facilities had a unique community structure with an unprecedented level of stability. Using machine learning, we identified a small subset of operational taxonomic units (OTUs; 145 out of 4,962), which predicted the location of the facility of origin for almost every sample (96.4% accuracy). Of these 145 OTUs, syntrophic bacteria were systematically overrepresented, demonstrating that syntrophs rebounded following disturbances. This indicates that resilience, rather than dynamic competition, played an important role in maintaining the necessary syntrophic populations. In addition, we explained the observed phylogenetic differences between all samples on the basis of a subset of environmental gradients (using constrained ordination) and found stronger relationships between community structure and its function rather than its environment. These relationships were strongest for two performance variables-methanogenic activity and substrate removal efficiency-both of which were also affected by microbial ecology because these variables were correlated with community evenness (at any given time) and variability in phylogenetic structure (over time), respectively. Thus, we quantified relationships between community structure and function, which opens the door to engineer communities with superior functions. community dynamics | UniFrac | community function | digester | sludge T he production of bioenergy from wastes is an essential component in the global development of sustainable energy sources (1). Anaerobic digestion, which is the most prominent bioenergy technology worldwide, uses undefined microbial cultures to produce methane from organic substrates (2). Methanogenic bioreactors are maintained on the basis of decades of observed relationships between performance and operating parameters. However, differences underlying bioreactors that perform well and bioreactors that perform inadequately are often poorly understood (3). This has led to a general perception that methanogenic bioreactors are unreliable or unstable, inhibiting their wider adoption for bioenergy production (2). A deeper analysis of the structure and dynamics of bioreactor microbial communities as a function of performance and operating conditions has the potential to reveal important and unappreciated structure-function relationships.