Temperature Effect on Water Extractability of Cadmium, Copper, Lead and Zinc from Composted Organic Solid Wastes of South-West Nigeria

Adekunle, Iheoma M.

doi:10.3390/ijerph6092397

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Composting is a process in which the waste materials are subjected to natural decomposition, facilitated by microbial activities under aerobic or anaerobic conditions and there are a wide range of methods by which composting can be achieved (He et al 2002, Barker & Gretchen 2002, Adekunle 2009). The increased cost of secured sanitary landfill construction and associated greenhouse gas (CH 4 ) emission, increasing demands for resource recovery from solid waste materials are among the several factors contributing to the global acceptance of composting (He et al 1992).…”

Section: Introductionmentioning

confidence: 99%

“…Studies on composting in the country have not been fully developed, being still at the literature review and research stages (Sridhar & Bammeke 1986, Adeoye et al 1994, Gbolagade 2006, Iwegbue et al 2007, Adekunle 2009. Although produced in the same country, the nature and basic characteristics of waste materials vary from one geographical location to another.…”

Section: Introductionmentioning

confidence: 99%

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Recycling of organic wastes through composting for land applications: a Nigerian experience

Adekunle

Akintokun

et al. 2010

Waste Manag Res

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In-vessel composting, a contribution to sustainable solid waste management, was conducted on source-separated waste materials generated in Abeokuta city, south-west Nigeria. Feedstock (household, agricultural and municipal waste) and the resultant composts were chemically characterized using standard procedures. Identification and changes in the microbial population during composting, the effects of composting on waste volume reduction (WVR) and elemental composition of composts were evaluated. Product performance on plant growth and metal uptake were then assessed using African spinach (Amaranthus hybridus) in a screen house for 8 weeks. Metals were determined in acid digest using atomic absorption spectrometry. Compost yields and WVR ranged from 35.28 to 48.68% and 51.66 to 64.72%, respectively. Compost heavy metal (Cu, Cr, Zn, Ni, Cd and Pb) concentrations (mg kg( -1)), ranging from 0.67-0.82; 0.13-7.5; 0.001-0.22; 1.67-18.33; 6.50-17.67; and 0.83-6.00 for Cu, Pb, Cd, Ni, Cr and Zn, respectively, were within limits for class A+ composts. The effect of composting varied with element type and significantly (p < 0.05) reduced microbial population by 44.44 to 88.46%. Plant height, leaf number and biomass yield gave positive correlations (r = 0.950 to 0.977; 0.978 to 0.989 and 0.99, respectively; p < 0.05) with applied compost rate. Low-metal composts were produced but the presence of Cd and Pb in plant tissues calls for further research on the long-term effect of products on plant metal uptake in amended soils. The study is a contribution to the data bank of composting as a low technology waste management option in the developing countries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycling of organic wastes through composting for land applications: a Nigerian experience

Adekunle

Akintokun

et al. 2010

Waste Manag Res

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“…If the view on global warming causing imbalance in the ecosystem is upheld, then, the impact of global warming on agriculture could be direct on plants or indirect by impacting factors that have bearing on crop productivity and soil sustainability (Adekunle, 2009). Having such impacts as stated above imply that the increased, sustainable and safe food production agenda of the country is at stake.…”

Section: Author(s) Agree That This Article Remain Permanently Open Acmentioning

confidence: 99%

Climate Change Effect and Adaptation Measures on Selected Soil Properties

Joseph¹,

Oluwakemi²,

Olanrewaju³

2018

J. Soil Sci. Environ. Manage.

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Soil sustainability in climate changing trends is critical to address future food security and safety. This study investigated the effect of air and soil temperature on some selected soil properties. The impact of soil conditioning with composted organic wastes on the temperature effect was also assessed. Four different chambers were set up using electrical bulbs of 60, 100, 200, and 300 W given air temperature ranges of 30-32, 33-35, 36-38 and 39-41°C (10 h daily photoperiod) respectively with two other natural growth units (27-29°C) with or without organic compost were established and replicated four times under screen house for 95 days. Soil properties; particle size distribution, electrical conductivity (EC), pH, cation exchange capacity (CEC), organic carbon (OC), N, P, and K were determined using standard methods. Positive correlation was obtained for air and soil temperature, and soil parameters varied significantly (P ≤ 0.05) for the different temperature ranges. Combined effect of elevated temperature and compost amendment increased soil properties by 0.45-54, 9-28, 0.4-0.6, 89-91 and 10-29% for C, K, pH, EC and CEC under different temperature regimes respectively. Nitrogen and phosphorus availability decreased by 16-21 and 8-37% with increased in temperature. The addition of compost cushioned the effects of increasing temperatures on soil factors. It is evident from the study that global warming could potentially alter fate of soil factors and which may be detrimental to sustainable food production and food security.

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“…Combined with meteorological data and sedimentary records in Chaohu Lake (SE China), Chen et al (2013b) revealed that annual mean air temperature was a significant factor influencing diatom succession, probably via increasing sediment nutrient release. In addition, rising temperature can increase water-extractable metal fractions, and then strength metal mobility and bioavailability (Adekunle, 2009). Therefore, climate warming might exacerbate eutrophication and metal contamination in these shallow urban lakes.…”

Section: Potential Impact From Climate Changementioning

confidence: 99%

Diatom response to heavy metal pollution and nutrient enrichment in an urban lake: evidence from paleolimnology

Chen

Chang-an

McGowan

et al. 2014

Ann. Limnol. - Int. J. Lim.

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-Diatoms and geochemical stratigraphy were studied in sediment core samples collected from a heavily polluted urban lake (SE China) in order to track the history of eutrophication and heavy metal contamination. The sediment profile covered ca. 60 years (from ca. 1951 to 2011) based on 137 Cs and Spheroidal carbonaceous particles (SCP) dating, and encompassed a period of rapid industrial development in this region. Diatoms experienced two visible shifts, including the replacement of benthic and epiphytic taxa by planktonic species (e.g., Cyclotella meneghiniana Ku¨tzing) in 1972, and the dominance of Cyclotella atomus Hustedt and Nitzschia palea (Ku¨tzing) W. Smith after 1999. Metals (i.e., Cd, Pb and Zn), total phosphorus, total nitrogen and total organic carbon all increased in the past 60 years. Redundancy analysis was used to correlate diatom with chemical change and explained 50.3-60% of total variation in diatom data for three periods (from 1951 to 1999, between 1951 and 2011 and from 1972 to 2011). The combined effects of nutrients and metals were the predominant factor, capturing 29.6-42.8% of the total variance. Nutrients alone accounted for little more variance than did metals alone for the first flora shift about 1972. The further shift after 1999 was more influenced by the sole effect of metals than that of nutrients. Increases in species (e.g., N. Palea) able to tolerate both nutrient-related and metal-related stressors were related to persistent nutrient and metal inputs. In addition, climate warming might exacerbate eutrophication and metal contamination in this lake.

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Temperature Effect on Water Extractability of Cadmium, Copper, Lead and Zinc from Composted Organic Solid Wastes of South-West Nigeria

Cited by 14 publications

References 14 publications

Recycling of organic wastes through composting for land applications: a Nigerian experience

Recycling of organic wastes through composting for land applications: a Nigerian experience

Climate Change Effect and Adaptation Measures on Selected Soil Properties

Diatom response to heavy metal pollution and nutrient enrichment in an urban lake: evidence from paleolimnology

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