Heavy metals accumulation and spatial distribution in long term wastewater irrigated soils

Elbana, Tamer A.; Ramadan, Malak A. E.; Gaber, Hesham M.; Bahnassy, Ahmed A; Kishk, Fawzy M.; Selim, H. M.

doi:10.1016/j.jece.2013.08.005

Cited by 45 publications

(19 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Use of wastewater in agriculture, a widespread practice worldwide [13] has the potential for both positive and negative impacts on crop production, public health, and ecology [48], with enormous impacts on the lives of poor communities [49]. Significant volumes of untreated wastewaters are becoming available to local farmers in areas where no other alternatives exist.…”

Section: Confronting Realitiesmentioning

confidence: 99%

“…As a result, about 75-90% of the supplied water is being discharged as untreated wastewater [11,12]. On the other hand, wastewater is emerging as an affordable and reliable alternative water supply for urban and outskirts to support their economy, particularly in arid and semi-arid regions [13]. In the Ethiopian context, rapid urbanization, scarcity of freshwater, lack of wastewater facilities, and increased demands for agricultural products coupled with an absence of monitoring and enforcement mechanisms make wastewater management complex.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Amare

Kebede

Kloos

et al. 2017

Water Conserv Sci Eng

View full text Add to dashboard Cite

Water is becoming a scarce resource in terms of quantity and quality. Water supply enhancement measures are being taken with less attention given to wastewater management, leading to increased discharge of untreated wastewaters. Wastewater is emerging as an affordable and reliable alternative water supply for urban agriculture, supporting thousands of farmers. Extensive use of untreated wastewater for irrigation will without a doubt lead to accumulation of heavy metals in soils and crops, resulting in overwhelming risks to both public health and the environment. This paper deals with determination of the strength and compositions of the wastewater from a public university in the tropical semiarid region for rainy and dry seasons, based on a number of key parameters including heavy metals. Furthermore, it identified the real advantages of treated water use and issues pertaining to untreated wastewaters use for irrigation purposes. An independent t test showed significant differences in concentrations of all the tested metals, excluding lead, copper, and cadmium during dry and wet seasons. Similarly, differences were significant for electrical conductivity, biological oxygen demand, total nitrogen and total phosphorus. Salinity and concentrations of organics, nutrients, copper, cadmium, iron, manganese and to some extent copper exceeded the allowable thresholds for irrigation water. Lead, zinc, nickel and chromium, on the other hand, were lower than their respective limits. Wastewater used for irrigation purposes is unsafe, and urgent policy interventions on the use of untreated wastewater are required.

show abstract

Section: Confronting Realitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Amare

Kebede

Kloos

et al. 2017

Water Conserv Sci Eng

View full text Add to dashboard Cite

show abstract

“…Recently, many articles have shown that estuarine aquaculture sediment and agricultural and mangrove forest soil are contaminated by heavy metals [2,3,4,5,6,7,8,9]. The top layer of soil retains heavy metals present in irrigation water through adsorption by soil particles.…”

Section: Introductionmentioning

confidence: 99%

Arsenic and Heavy Metal Contamination in Soils under Different Land Use in an Estuary in Northern Vietnam

Van

Ozaki

Tho

et al. 2016

IJERPH

View full text Add to dashboard Cite

Heavy metal contamination of soil and sediment in estuaries warrants study because a healthy estuarine environment, including healthy soil, is important in order to achieve ecological balance and good aquaculture production. The Ba Lat estuary of the Red River is the largest estuary in northern Vietnam and is employed in various land uses. However, the heavy metal contamination of its soil has not yet been reported. The following research was conducted to clarify contamination levels, supply sources, and the effect of land use on heavy metal concentrations in the estuary. Soil samples were collected from the top soil layer of the estuary, and their arsenic (As), chromium (Cr), cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) concentrations were analyzed, as were other soil properties. Most soils in the estuary were loam, silt loam, or sandy loam. The pH was neutral, and the cation exchange capacity ranged from 3.8 to 20 cmol·kg−1. Manganese and iron concentrations averaged 811 µg·g−1 and 1.79%, respectively. The magnitude of the soil heavy metal concentrations decreased in the order of Zn > Pb > Cr > Cu > As > Cd. The concentrations were higher in the riverbed and mangrove forest than in other land-use areas. Except for As, the mean heavy metal concentrations were lower than the permissible levels for agricultural soils in Vietnam. The principal component analyses suggested that soil As, Pb, Zn, Cd, and Cu were of anthropogenic origin, whereas Cr was of non-anthropogenic origin. The spatial distribution of concentration with land use indicated that mangrove forests play an important role in preventing the spread of heavy metals to other land uses and in maintaining the estuarine environment.

show abstract

“…Organic matter exhibits high affinity for trace metals (Elbana et al 2013) and that it can play an important role in metal immobilization (Janos et al 2004;Sauvé et al 2000). So, it is very important to investigate the role of this compound in the metal distribution in the tested soil.…”

Section: Introductionmentioning

confidence: 99%

Assessment of effect of pH, temperature and organic matter on zinc mobility in a hydromorphic soil

2015

View full text Add to dashboard Cite

Before using Zn-rich sewage sludge in agricultural soil, it is very important to study the behavior of this pollutant and its mobility in semiarid climate to prevent the risk that may pose on the human health. Batch technique was used to study sorption and desorption experiments of zinc onto hydromorphic soil with a loamy texture. Results showed that the effect of pH ranged between 6 and 7.8 on zinc sorption amount was negligible. Whereas the coefficient of distribution K d at pH = 6 was 1-3 times greater than at pH = 7.8. The increase in temperature from 25 ± 2 to 40 ± 2°C increased zinc uptake by 4.37-63.2 % and 3.75-27.09 % at pH 7.8 and 6, respectively. The removal of organic matter slightly enhanced zinc sorption at alkaline pH; while it remarkably reduced it at acidic pH suggesting that organic matter effect depended significantly on pH. All sorption data of zinc fitted only the Freundlich equation. Also, the sorption energies (E) calculated from the Dubinin-Radushkevich equation were high implicating that the main process of zinc uptake was chemisorption. Zinc speciation after sorption experiments showed that the added zinc amount was mostly bonded to oxides fraction at alkaline pH and to organic matter at acidic pH. Zinc mobility in the two investigated soil pH values was similar, while its mobility was not very affected by the organic matter removal. The percentage of desorbed zinc (bioavailable) was higher into 0.05 M of ethylenediaminetetraacetic acid (about 20 %) than into distilled water (B4 %). From the principal component analysis, we deduced that pH was the main factor controlling zinc sorption and the coefficient of distribution K d was the best parameter that describes the mechanism of zinc retention onto hydromorphic soil.

show abstract

Heavy metals accumulation and spatial distribution in long term wastewater irrigated soils

Cited by 45 publications

References 24 publications

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Arsenic and Heavy Metal Contamination in Soils under Different Land Use in an Estuary in Northern Vietnam

Assessment of effect of pH, temperature and organic matter on zinc mobility in a hydromorphic soil

Contact Info

Product

Resources

About