Ecological health status of the Lagos wetland ecosystems: Implications for coastal risk reduction

Agboola, Julius I.; Ndimele, Prince Emeka; Odunuga, Shakirudeen; Akanni, Adeniran; Kosemani, Bosede; Ahove, Michael Adetunji

doi:10.1016/j.ecss.2016.10.019

Cited by 21 publications

(10 citation statements)

References 15 publications

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“…A lot of the processes in aquatic ecosystem are driven by these water quality variables, which must be maintained within specific limits; otherwise the water body would be unable to provide its traditional services to man and its environment. The results of the physico-chemical parameters of this study conform to earlier studies on Badagry Creek and Ologe Lagoon in the Lagos Lagoon complex (Agboola et al, 2016. Some of the water quality variables showed significant (p<0.05) variation among the sampling stations.…”

Section: Physicochemical Parameters In Watersupporting

confidence: 89%

Ecosystem health assessment of three inland water bodies in South-west, Nigeria based on fish diversity, pollution status, ecological and health risk indices

Ndimele

Owodeinde

Giwa-Ajeniya

et al. 2021

Preprint

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This study was conducted to determine the health status of three water bodies (Badagry Creek, Ologe Lagoon and River Owo) because of the large amount of effluent they receive from industries around Lagos as well as the services they provide to sustain the large human population in an emerging mega city like Lagos. Water, sediment and fish samples were collected monthly from the three water bodies between January and December, 2018. Standard methods were used for the analysis of physico-chemical parameters, heavy metals, length-weight relationship, condition factor, fish diversity indices, sediment pollution indices, ecotoxicology of heavy metals in sediment and potential ecological risks as well as health risk assessment of heavy metals. The geoaccumulation index (Igeo) of heavy metals in sediments of the sampling sites ranged from − 12.14 to -0.38. The mean quotients using the probable effect level (m-PEL-Q) are 3.91 x10-4, 4.77 x10-4 and 7.87 x10-4 for Ologe Lagoon, Badagry Creek and River Owo respectively. The trend was the same with mean quotients using effect range-median (m-ERM-Q). The estimated daily intake (EDI) ranged from 0.00 mgkg-1day-1 in Pb from River Owo to 1.15 x10-3 mgkg-1day-1 in Fe still from River Owo. The range of values of the target hazard quotient (THQ) of the metals in Badagry Creek, River Owo and Ologe Lagoon are 1.23x10-4–1.65x10-2, 0.00–1.64x10-2 and 5.76x10-5–1.65x10-2 respectively. The study showed that the three aquatic ecosystems are healthy but require regular monitoring to promptly detect sudden changes in their health status.

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Section: Physicochemical Parameters In Watersupporting

confidence: 89%

Ecosystem health assessment of three inland water bodies in South-west, Nigeria based on fish diversity, pollution status, ecological and health risk indices

Ndimele

Owodeinde

Giwa-Ajeniya

et al. 2021

Preprint

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“…However, the BOD 5 in the outflow water of the three treatments at 5 L/s was higher than that of the other flows. On the other hand, the discharge of hospital wastewater with BOD 5 concentrations above the maximum allowable limits could affect the ecological health of the receiving water bodies (Agboola et al, 2016;Al-Kubaisi et al, 2021). Therefore, the addition of chlorine in treated water is necessary to eliminate pathogenic bacteria (Verlicchi et al, 2015) and maintain safety for reuse (Desye et al, 2021).…”

Section: Treatment Of Hospital Wastewater By Residual Chlorine Applic...mentioning

confidence: 99%

Treatment of Hospital Wastewater Using Activated Sludge with Extended Aeration

Custodio¹,

Cuadrado-Campó²,

Peñaloza³

et al. 2022

J. Ecol. Eng.

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Hospital wastewater is of a complex nature and is generally discharged into urban sewage systems. This study evaluated the removal efficiency of organic and biological contaminants from a hospital wastewater treatment plant using extended aeration activated sludge. The study was conducted at a treatment plant scale, with 14 hours of feed. The plant consists of a pre-filter, a collector and crumbler tank, a homogenization tank, two biological reactors of 80 000 liters capacity each, two settlers and a contact disinfection chamber. Three flow rates of 3 L/s, 4 L/s and 5 L/s were tested in each biological reactor, with application of three concentrations of residual chlorine with sodium hypochlorite to the effluent of the settling tanks (0.3 ppm, 0.4 ppm and 0.5 ppm). The removal efficiency of suspended solids varied according to flow rate. The reactor with a flow rate of 3 L/s and 0.5 ppm of residual chlorine achieved the highest removal of suspended solids (91.95%), biological oxygen demand (97.52%) and fecal coliforms (99.99%). Finally, the quality of the hospital wastewater is within the limits of the national and international environmental quality thresholds.

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“…The laboratory experimental technique was used to analyze the quality of the [24]). Also, the nutrient and metal analyses followed the methodology described in [23]. The used for the study is as presented in Table 1.…”

Section: Water Quality Abstraction and Supplymentioning

confidence: 99%

“…Surface water samples were collected at about 0.5 m depth in acid clean 2-L plastic bottles with screw caps[22] [23]. In order to minimized the absorption of metals onto the sample bottles wall, the water samples were acidified using nitric acid[23] [24][25] and immediately transferred to a cool storage environment at −10˚C so as to retain the physical properties of the water samples. Hydrogen ion concentration (pH), conductivity/salinity, turbidity, dissolved oxygen and temperature of samples were measured in-situ using a…”

mentioning

confidence: 99%

Human-Nature Interactions in the Owo River Catchment, South-West, Nigeria

Adegun¹,

Odunuga²,

Ajayi³

2019

JEP

Self Cite

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This paper examines the interactions and feedbacks between environmental and human variables within the Owo River catchment by analyzing land use change, morphometric dynamics, rainfall stationarity and water quality using statistical approach. The results show that built-up land use grew from 142.92 km 2 (12.20%) in 1984 to 367.22 km 2 (31.36%) in 2013 at an average growth rate of 7.73 km 2 per annum. Total streams length reduced from 622.24 km in 1964 to 556 km in 2010 while stream density reduced from 0.53 in 1964 to 0.47 in 2010. The Mann-Kendall trend test (p-value = 0.022) indicates rainfall non-stationarity. The river has a low level of pollutant loading while annual water abstraction balances water supply. The human environment interaction has not at present critically affected water supply (quality and quantity) but continuous loss of vegetation poses greater challenges.

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Ecological health status of the Lagos wetland ecosystems: Implications for coastal risk reduction

Cited by 21 publications

References 15 publications

Ecosystem health assessment of three inland water bodies in South-west, Nigeria based on fish diversity, pollution status, ecological and health risk indices

Ecosystem health assessment of three inland water bodies in South-west, Nigeria based on fish diversity, pollution status, ecological and health risk indices

Treatment of Hospital Wastewater Using Activated Sludge with Extended Aeration

Human-Nature Interactions in the Owo River Catchment, South-West, Nigeria

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