The most common approaches for the in-situ bioremediation of contaminated sites worldwide are bioaugmentation and biostimulation. Biostimulation has often proved more effective for chronically contaminated sites. This study examined the effectiveness of optimized water hyacinth compost in comparison with other organic and inorganic amendments for the remediation of crude oil-polluted soils. Water hyacinth was found to be rich in nutrients necessary to stimulate microbial growth and activity. An organic geochemical analysis revealed that all amendments in this study increased total petroleum hydrocarbon (TPH) biodegradation by ≥75% within 56 days, with the greatest biodegradation (93%) occurring in sterilized soil inoculated with optimized water hyacinth compost. This was followed by polluted soil amended with a combination of spent mushroom and water hyacinth composts (SMC + WH), which recorded a TPH biodegradation of 89%. Soil amendment using the inorganic fertilizer NPK (20:10:10) resulted in 86% TPH biodegradation. On the other hand, control samples (natural attenuation) recorded only 4% degradation. A molecular analysis of residual polycyclic aromatic hydrocarbons (PAHs) showed that the 16 PAHs designated by the US EPA as priority pollutants were either completely or highly degraded in the combined treatment (SMC + WH), indicating the potential of this amendment for the environmental remediation of soils contaminated with recalcitrant organic pollutants.

Some physico-chemical properties and the concentrations of the metals Fe, Mn, Ni, Cd, Cr, Co, Cu, Pb, and Zn in water and sediments were examined from September 2011 to January 2012 in Bodo Creek, where oil spills have been recurrent. Temperature, pH, total dissolved solid, conductivity, salinity, dissolved oxygen, biological oxygen demand (BOD), chemical oxygen demand (COD), total hardness, sulfate, nitrate, and phosphate were determined in surface water. Particle size, total organic matter (TOM), and pH were also determined in the sediments. The parameters were within permissible limits except the mean values of BOD, COD, total hardness, and sulfate that exceeded levels permissible for domestic use. The sediments consisted mainly of sand, with TOM ranging from 0.2% to 5.5%. With the exception of cadmium that was below detection limit, metal levels (mg kg⁻¹) in the sediments were 12 (Mn), 1070 (Fe), 10 (Cu), 10 (Zn), 5.3 (Cr), 1.1 (Pb), 1.0 (Ni), and 0.5 (Co) while in water they were 24, 98, 21, 6.9, 4.0, 0.6, 0.18, and 0.16, respectively. The latter were higher than World Health Organization recommended permissible levels for both surface and drinking water.

Fisheries support livelihood of over half a billion of people globally. Many of these people live in coastal regions of developing countries; and have limited capacity to adapt and build resilience in the face of climate change. This research assesses the biophysical and socioeconomic characteristics of fishers in four coastal communities, Komenda, Elmina, Cape coast and Morree, in Ghana. Structured questionnaire based on selected indicators that serve as proxy for components of the vulnerability were administered randomly to 237 fishers through face-to-face survey. Descriptive statistics was used to determine the socio-demographic characteristics profile of fishermen and how it will affect their susceptibility to climate change. There were slight differences in the socio-demographic characteristics of the four communities, probably because of their similar physical locations and occupation. A theoretically-derived vulnerability index was used to determine their vulnerability which was based on the components of vulnerability identified from 1IPCC and capital assets identified from sustainable livelihood framework. The vulnerability index score in Morre was found to be the highest (0.64) while that of Elimina was the lowest (0.30). The size and activities in Elmina and Moree artisanal landing site did not play any role in the vulnerability of fishers in these communities rather better access to basic amenities and livelihood strategies affected their vulnerability. Since vulnerability and adaptations are highly specific to a particular people or location, this study will be used to examine the fishers’ vulnerability to climate change and to target adaptation interventions in these communities.

Distribution of Trace Metals in Water and Sediments of Qua Iboe River Estuary, Nigeria

The persistent issue of drought in Northern Nigeria is exacerbated by the reduction in precipitation and rise in temperature. Nigeria is being impacted by climate change in diverse ways, necessitating the immediate implementation of proactive measures to tackle its challenges. It is crucial to integrate adaptation and mitigation into the country's development plans. The objective of the study is to identify current practices, gaps, and opportunities for incorporating climate change into the EIA framework; and the integration of climate change considerations into the Environmental Impact Assessment (EIA) process from projects in Northern Nigeria. The study assesses various criteria in EIA reports, such as vulnerability assessments, climate projections, adaptation measures, stakeholder engagement, and policy compliance. A self-created questionnaire titled "Mainstreaming Climate Change within EIA" was utilized to collect data. The questionnaire was designed with an interactive format, divided into three main categories (Category A, B, C). It was conducted between February and April 2022, with 400 potential volunteers receiving electronic and hard copies of questionnaires, resulting in 127 valid responses. The findings from five EIA reports of projects in Northern Nigeria revealed significant gaps in addressing climate change, including limited attention to vulnerability and risk assessments, inadequate reporting of adaptation measures, and insufficient stakeholder engagement. Key stakeholder interviews conducted support the relevance and significance of incorporating climate change adaptation skills into the EIA process. However, the study contends that in order for stakeholders to accept mainstreaming climate change mitigation and adaptation, institutional and policy changes are needed.