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Apr 2020 DOI 10.14302/issn.2637-6075.jpae-20-3322
Omozemoje Ayobami AigberuaCorresponding author
Department partment of Environment, Research and Development, Anal Concept Limited, Elelenwo, Rivers State, Nigeria
In spite of the popularity of open-air waste dumping in Nigeria, it remains a relatively less effective waste management option across the globe because of its associated environmental impacts which includes the release of green house gases (GHGs), persistent organic pollutants (POPs), and metal micro-pollutants amongst others. This study aims to assess the potential environmental risks associated to metals released and vertically delineated across the soil profile within surroundings of dumpsite. Heavy metals in soil samples were acid-digested using the aqua-regia mixture of hydrochloric and nitric acid, followed by instrumentation analysis using the GBC 908 PBMT model atomic absorption spectrophotometer. Contaminated sites showed metal concentrations ranging from 1.493 to 109.460 mg/kg, 0.133 to 4.237 mg/kg, and 5.200 to 25.367 mg/kg for lead, cadmium and chromium respectively, with location 1 land area showing the most contamination. Only soil chromium was observed within regulatory stipulations in all cases. There was significant variation (p < 0.05) between the different sample locations, thereby indicating variations in composition of dumped wastes. Lead and cadmium showed the strongest positive correlation (r = 0.855, p < 0.01) and the application of some heavy metal pollution indicators revealed relatively higher metal loads and degree of contamination, as well as depicting potential ecological risk for soils of location 1. The significant heavy metal contamination of soils in the Tombia-Amassoma waste dumpsite requires that the local environmental sanitation and regulatory authorities take necessary remedial action to forestall the escalation of public health concerns that may emanate from this open-air dump.
Dec 2019 DOI 10.14302/issn.2641-7669.ject-19-3125
C.N Angaye TariwariCorresponding author
Department of Biological Sciences, Niger Delta University, Bayelsa State, Nigeria.
Emission of Hydrogen Sulphide (H2S) from dumpsites has become a global threat due to its impact on global climate change. This study assessed the spatial and seasonal levels of H2S emissions from 6 dumpsites (LA - LF), with portable air quality meter (AEROQUAL-Series 300). Results showed that the spatial level of H2S ranged from 1.40 ppm - 14.34 ppm. Based on seasonal variation level of H2S ranged from 1.88 ppm – 3.86 ppm (p<0.05), with higher values in wet season. Meanwhile H2S were not detected in the control station (LX). Based on model for Air Quality Index (AQI), H2S emission was predominantly rated as safe and moderate, except for the two stations in the central dumpsite (LE and LF). These results confirmed the emission of H2S from the dumpsite due to anthropogenic activities. We therefore recommend policies aimed at sequestration of H2S, by the reduce, reuse and recycle policy of waste stream.
Oct 2019 DOI 10.14302/issn.2637-6075.jpae-19-3022
Chibueze Izah SylvesterCorresponding author
Department of Biological Sciences, Bayelsa Medical University, Yenagoa, Bayelsa State, Nigeria.
This study assessed the effect of aluminum phosphide on transferases in liver and muscle of Parophiocephalus obscurus (with mean weight of 42.20±1.5 gSD and mean length of 16.50± cmSD, respectively). The fish were obtained from a private fish farm in Yenagoa Metropolis, Nigeria, and the fish was allowed acclimatized to laboratory condition for 7 days, and then exposed to sublethal concentrations (0.00mg/L, 4.20mg/L, 6.30mg/L and 8.40mg/L) of aluminum phosphide for 14 days. Renewal bioassay was adopted in this study. At the end of the experimental period, the fish was dissected and the muscle and liver were collected, processed and analyzed for alanine aminotransferase and aspartate aminotransferase using colorimetric method. Results of the phosphatase at 0.00mg/L, 4.20mg/L, 6.30mg/L and 8.40mg/L were 94.50±6.44µ/L, 134.47±15.27 µ/L, 106.47±9.21 µ/L and 31.00±3.46 µ/L, respectively (liver), 107.50±9.24, 92.00±6.93 µ/L, 116.50±8.95 µ/L and 146.33±9.33 µ/L respectively (muscle) for aspartate aminotransferase; and 40.00±1.15µ/L, 26.50±3.18µ/L, 14.50±2.02µ/L and 9.80±1.44 µ/L, respectively (liver) and 17.00±1.75µ/L, 8.50±0.87µ/L, 21.00±2.89µ/L and 5.50±0.87 µ/L, respectively (muscle) for alanine aminotransferase. Statistically, there were significant variations (p<0.05) among the various concentration in the transferances. In addition, at some concentration, there was significant variations (p<0.05) between the level of the transferases in the muscle and liver. The significant alteration observed in the various concentrations is an indication that aluminum phosphide is lethal to fish. Therefore, caution should be exercise during the use of aluminum phosphide near biological system.
Apr 2019 DOI 10.14302/issn.2641-7669.ject-19-2753
C.N Angaye TariwariCorresponding author
Department of Biological Sciences, Niger Delta University, Bayelsa State, Nigeria.
The problem associated inappropriate management of municipal waste to the ecosystem cannot be overemphasized. This study involved the physical characterization of municipal solid waste streams in 4 commercial dumpsites in Yenagoa Metropolis, using the quartile estimate method. Results showed that out of a total mass of 79.82kg; the individual mass composition was reported for garbage (food) waste 33.32 (39%), paper waste 14.90 kg (40.82%), plastic waste 5.12 kg (6%), nylon 11.01kg (13%), metal 4.31 kg (5%), wood 2.29 kg (3%), electronic 5.69 kg (7%), glass/ceramic 3.48 kg (4%) and unclassified waste whose mass was 4.62kg (5%). Disposal of untreated and unsegregated/uncharacterized waste adverse effect to the environment. It is hereby recommended that the populace to desist from illicit disposal of waste stream. In addition all stakeholders and Government in particular should formulate policies the reduction, reuse and recycling of waste stream.
Jan 2019 DOI 10.14302/issn.2641-7669.ject-18-2550
C. N Angaye TariwariCorresponding author
Department of Biological Science, Faculty of Science, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
The ecotoxicological effects of leachates from dumpsite have become a major problem. Leachates arising from waste dumpsites are transported by surface runoff or infiltration through the soil and become bioavailable in the ecosystem. The ecotoxicological assessment of leachates from 6 dumpsite in Yenagoa Metropolis were investigated against adult and fingerlings of Clarias gariepinus (African catfish). Ecotoxicological activities (LC50 values) were reported for the following stations; Akenpai (124.57 ppm), and Etegwe stations (95.38 ppm), as well as Opolo (157.95 ppm), and Kpansia Markets (123.82 ppm). In addition, leachates of the two stations from the central dumpsite (CDS), were the most active (CDS 1; 60.97 ppm, and CDS 2; 76.65 ppm). Notwithstanding, the order of toxicological activities of the leachates were reported as; CDS 1>CDS2>Etegwe>Akenpai>Kpansia market>Opolo Market. These results confirm the toxicity of leachates from the dumpsites. In addition, we recommend that government, regulators and all stakeholders should enact policies to treat, reduce, recycle and reduce waste stream in order to mitigate the adverse effects on the ecosystem.