Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Badza, Taruvinga; Tesfamariam, Eyob Habte; Cogger, Craig

doi:10.1016/j.scitotenv.2020.137658

Cited by 38 publications

(18 citation statements)

References 71 publications

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“…Lower heavy metal levels were present in the topsoil as compared to the sewage sludge for all the selected heavy metals. e presence of heavy metals in the sewage sludge accord with several research works which reported the presence of heavy metals in sewage sludge as a major setback to its application in agriculture [20][21][22]. Levels of metals in the soil samples were all within the EU directives of acceptable limits of heavy metals in soil: Pb (50-300 mg/kg), Cu (50-140 mg/kg), and Zn (150-300 mg/kg).…”

Section: Background Concentrationsupporting

confidence: 78%

Levels of Lead, Copper, and Zinc in Cabbage (Brassica oleracea sp.) and Lettuce (Lactuca sativa sp.) Grown on Soil Amended with Sewage Sludge

Fei‐Baffoe

Amo-Asare

Sulemana

et al. 2021

Journal of Environmental and Public Health

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The study focused on levels of selected heavy metals (Pb, Zn, and Cu) in sewage sludge, soil, and in lettuce and cabbage grown on sewage sludge amended soil. Also, the effect of sewage sludge on soil properties (pH, soil organic matter, and soil conductivity) was studied. Three treatments were used based on nitrogen application rates of the sewage sludge: 100, 150, and 200 kg N/ha for lettuce while 160, 210, and 260 kg N/ha for cabbage. A pot experiment was conducted with pots arranged in a completely randomized design and under local climatic conditions. The study revealed that soil organic matter content and conductivity increased significantly with increasing nitrogen application rates. Levels of heavy metals in the soil increased significantly with increasing application rates. The controls for both plants recorded the lowest heavy metal uptake. Cabbage had an uptake of 0.48 ± 0.13, 1.36 ± 0.23, and 2.60 ± 0.29 mg/kg for Pb, Zn, and Cu, respectively, while lettuce had 0.34 ± 0.19, 1.35 ± 0.31, and 2.30 ± 0.14 mg/kg uptake for Pb, Zn, and Cu, respectively. Highest metal uptake was recorded at the highest application rate in both plants (0.66 ± 0.17, 2.66 ± 0.09, and 4.33 ± 0.14 mg/kg for Pb, Zn, and Cu, respectively, for cabbage and 0.54 ± 0.01, 2.24 ± 0.17, and 3.88 ± 0.19 mg/kg of Pb, Zn, and Cu, respectively, for lettuce). The uptake of Zn and Cu was significant, while Pb uptake was insignificant for both plants. Yields increased significantly with increasing application rates. The study provides information on yield enhancement resulting from cultivating plants on soil amended with sewage sludge and the associated health risk implication.

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Section: Background Concentrationsupporting

confidence: 78%

Levels of Lead, Copper, and Zinc in Cabbage (Brassica oleracea sp.) and Lettuce (Lactuca sativa sp.) Grown on Soil Amended with Sewage Sludge

Fei‐Baffoe

Amo-Asare

Sulemana

et al. 2021

Journal of Environmental and Public Health

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“…Sludge applications in forests can be environmentally sound if application rates are matched to site characteristics (Zasoski et al, 1984). Badza et al (2020) assessed the use of MSS in agricultural processes using the characteristics of MSS from 18 wastewater treatment plants in South Africa and found that applying MSS to land was the best option. However, hazardous substances in MSS pose risks to soil, plants, and humans.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive recycling of fresh municipal sewage sludge to fertilize garden plants and achieve low carbon emission: A pilot study

Lin

Chen

et al. 2022

Front. Environ. Sci.

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Recycling nutrients in municipal sewage sludge (MSS) to soil would support sustainable development. In this study, a comprehensive recycling using specific plants able to grow in the fresh MSS and an indirect application technique was developed. Fresh MSS was placed in permeable containers next to Handroanthus chrysanthus plants to provide indirect fertilization. Sludge treatment plants (Alocasia macrorrhiza and Pennisetum hybridum) were grown directly on the Fresh MSS to produce plant biomass and treat MSS. The basal diameters of the H. chrysanthus plants were markedly increased by the treatment. Nutrients were extracted from MSS more readily and more biomass was produced by the P. hybridum than the A. macrorrhiza plants. The heavy metal contents of the soil did not increase significantly and not generate potential ecological risk, but the organic matter, nitrogen, and phosphorus contents increased markedly. The fresh MSS leachate met the relevant fecal coliform and heavy metal irrigation water standards. At the end of the treatment, the MSS mass had markedly decreased and the treated MSS was used as a seedling substrate for two garden plant seedlings. The net carbon emissions from the comprehensive recycling are estimated as -15.79 kg CO2e (CO2 equivalent) per ton fresh sludge, in contrast, the emissions from composting treatment are estimated as 8.15 kg CO2e. The method allows nutrients in MSS to be recycled without causing heavy metal pollution and without net carbon emission, while gives gardening products with commercial value.

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“…The product of interest is a gaseous mixture mainly rich in methane (CH 4 ) and carbon dioxide (CO 2 ) [12], with the potential to reduce CO 2 equivalent emissions and save on the purchase of fossil fuels [13]. AD used as treatment for wastewater produces sludge with high contents of organic matter (45-85%), nitrogen (95-790 mg L -1 ), phosphorus (13-28 g kg -1 ), and potassium (1.5-8.2 g kg -1 ), with potential uses in the irrigation of crops such as corn [14]. Likewise, the treatment of solid waste generates a digestate with a high content of nitrogen (20-40 mg g -1 ), phosphorus (9.5-25 mg g -1 ), and potassium (1.1-2.3 mg g -1 ) [15] with agricultural applications [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature on kinetics and hydraulic retention time in discontinuous and continuous anaerobic systems

Maldonado-Saeteros

Baquerizo-Crespo

Gómez-Salcedo

et al. 2022

Environmental Engineering Research

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Anaerobic digestion (AD) is a biological treatment susceptible to temperature variations. The Arrhenius model and the Van´t Hoff-Arrhenius relationship analyze the temperature effect in AD first-order kinetic constant (k). Kinetic data is relevant for estimating the hydraulic retention time (HRT) in continuous reactors. This research aimed to evaluate the behavior of kinetic constants concerning temperature using the Arrhenius model and Van´t Hoff-Arrhenius relationship and analyze the influence of kinetic constants as estimators of the HRT. The evaluation of the temperature effect in AD analyzed k fit to the Arrhenius model and Van’t Hoff-Arrhenius relationship. The research used data of AD methane yield (B0) kinetics from the literature, corresponding to macroalgae (MA) (25, 35, 45oC), swine manure (SM) (25, 30, 35oC), and co-digestion of chicken manure with sawdust and miscanthus (CM) (35, 40, 42oC). The Arrhenius model and Van´t Hoff-Arrhenius relationship fitted the data with reduced temperature intervals (∆T = 5°C). The HRT analysis used a mass balance model considering 80% of the maximum B0 compared with the technical digestion time at 80 (T80) and 90% (T90) of the maximum B0. The results indicate that the HRT calculation is sensitive for k below 0.13 d-1.

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Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Cited by 38 publications

References 71 publications

Levels of Lead, Copper, and Zinc in Cabbage (Brassica oleracea sp.) and Lettuce (Lactuca sativa sp.) Grown on Soil Amended with Sewage Sludge

Levels of Lead, Copper, and Zinc in Cabbage (Brassica oleracea sp.) and Lettuce (Lactuca sativa sp.) Grown on Soil Amended with Sewage Sludge

Comprehensive recycling of fresh municipal sewage sludge to fertilize garden plants and achieve low carbon emission: A pilot study

Influence of temperature on kinetics and hydraulic retention time in discontinuous and continuous anaerobic systems

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