Impact of fly ash and phosphatic rock on metal stabilization and bioavailability during sewage sludge vermicomposting

Wang, Longmian; Zhang, Yimin; Lian, Jing; Chao, Jianying; Gao, Yuexiang; Yang, Fei; Zhang, Leiyan

doi:10.1016/j.biortech.2013.03.039

Cited by 96 publications

(23 citation statements)

References 30 publications

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“…Earthwoms increase the quantity of small particles by ingesting, mixing, grinding, and then egesting organic material [92]. In addition, the nutrient level was higher and the heavy metal concentration was lower in vermicompost [91,93,94]. Moreover, the supplement of additives could counteract some negative aspects of composting processes, such as emissions of GHGs and odorous molecules.…”

Section: Feedstock Waste Use As Growing Medium For Plant Production Rmentioning

confidence: 99%

Increasing Sustainability of Growing Media Constituents and Stand-Alone Substrates in Soilless Culture Systems

2019

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Decreasing arable land, rising urbanization, water scarcity, and climate change exert pressure on agricultural producers. Moving from soil to soilless culture systems can improve water use efficiency, especially in closed-loop systems with a recirculating water/nutrient solution that recaptures the drain water for reuse. However, the question of alternative materials to peat and rockwool, as horticultural substrates, has become increasingly important, due to the despoiling of ecologically important peat bog areas and a pervasive waste problem. In this paper, we provide a comprehensive critical review of current developments in soilless culture, growing media, and future options of using different materials other than peat and rockwool. Apart from growing media properties and their performance from the point of view of plant production, economic and environmental factors are also important. Climate change, CO 2 emissions, and other ecological issues will determine and drive the development of soilless culture systems and the choice of growing media in the near future. Bioresources, e.g., treated and untreated waste, as well as renewable raw materials, have great potential to be used as growing media constituents and stand-alone substrates. A waste management strategy aimed at reducing, reusing, and recycling should be further and stronger applied in soilless culture systems. We concluded that the growing media of the future must be available, affordable, and sustainable and meet both quality and environmental requirements from growers and society, respectively.

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Section: Feedstock Waste Use As Growing Medium For Plant Production Rmentioning

confidence: 99%

Increasing Sustainability of Growing Media Constituents and Stand-Alone Substrates in Soilless Culture Systems

2019

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“…Organic additives, such as biochar, straw and sawdust, decreased the bioavailability of heavy metals to worms during vermicomposting (Malińska et al 2017) and reduced the concentration of heavy metals in vermicomposts (He et al 2016). During sewage sludge composting, worms improved the efficiency of additives such as fly ash or sawdust by increasing the exchangeable fraction of essential nutrients such as Zn and Cu and decreasing the soluble forms of non-essential elements such as Cr and Pb (Wang et al 2013a). Mineral additives were found to decrease heavy metal content and availability in covermicomposts (Hayawin et al 2014;He et al 2016).…”

Section: Reduction Of Environmental Hazards Due To Heavy Metalsmentioning

confidence: 99%

Composting with additives to improve organic amendments. A review

Barthod

Rumpel

Dignac

2018

Agron. Sustain. Dev.

209

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Composting and vermicomposting are sustainable strategies to transform organic wastes into organic amendments, valuable as potting media or soil conditioner. However, the negative aspects of these processes are emissions of greenhouse gases and odorous molecules and final product potentially containing toxic compounds. These negative aspects can be limited through the addition of organic, inorganic or biological additives to the composted or vermicomposted mixture. The aims of this review are (1) to present the main characteristics of composting and vermicomposting processes with and without additives, (2) to show the influence of additives on greenhouse gas emissions during waste degradation and (3) to report the effects of additives on the properties of the final products (heavy metal and nutrient contents), in view of their use as a soil conditioner or potting media. Finally, the feasibility and potential environmental benefits of co-composting and co-vermicomposting are discussed. Our results show that additives affect composting parameters such as temperature, pH and moisture and thus have an impact on the composting process. They may be used to reduce gas emissions and mobility of mineral ions. The various additives have contrasting effects on the quality of the final product and its impact on soil quality. The use of worms and additives seems to increase plant available nutrient contents, while decreasing N leaching, heavy metal mobility and composting time. Cocomposting and co-vermicomposting strategies need to be locally optimised, involving the generated amendments in a circular economy to improve sustainability of agricultural systems.

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“…Many studies have been done to study physicochemical reactions such as adsorption-desorption, oxidation-reduction, or precipitation occurring on a lifted pH level [27,63,64]. It should be noted that the acid-base buffering capacity of soil was another important property influencing the speciation change of heavy metals.…”

Section: Phmentioning

confidence: 99%

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

2017

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Abstract:The safe disposal of sewage sludge during the process of municipal wastewater treatment has become one of the major concerns of increased production. Land application was thought of as a more economical method for sewage sludge disposal than landfill and incineration. However, the presence of heavy metals in sewage sludge restricted the use of land application. The environmental risk of heavy metals was dependent on their contents, chemical speciations, and soil characteristics. Composting and chemical immobilization were the commonly used methods to immobilize the heavy metals in sewage sludge. The immobilization mechanism and speciation transformation of heavy metals during the composting process were presented. Aluminosilicate, phosphorus-bearing materials, basic compounds, and sulfides were reviewed as the commonly used chemical immobilizing agents. The problems that occur during the immobilization process were also discussed. The combination of different methods and the modification of chemical immobilizing agents both improved the fixation effect on heavy metals.

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Impact of fly ash and phosphatic rock on metal stabilization and bioavailability during sewage sludge vermicomposting

Cited by 96 publications

References 30 publications

Increasing Sustainability of Growing Media Constituents and Stand-Alone Substrates in Soilless Culture Systems

Increasing Sustainability of Growing Media Constituents and Stand-Alone Substrates in Soilless Culture Systems

Composting with additives to improve organic amendments. A review

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

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