Article

Studies on Land Application of Sewage Sludge and Its Limiting Factors

Key Laboratory of Terrestrial Ecosystems Process, Institute of Applied Ecology, Chinese Academy of Sciences, P.O. Box 417, No. 72, Wenhua Road, Shenyang 110016, China.
Journal of Hazardous Materials (Impact Factor: 4.53). 04/2008; 160(2-3):554-8. DOI: 10.1016/j.jhazmat.2008.03.046
Source: PubMed

ABSTRACT

Field experiments were conducted to study the effect of sewage sludge application on the heavy metal content in soils and grasses. The sewage sludge was obtained from Northern Shenyang Wastewater Treatment Plant, China, and applied at 0, 15, 30, 60, 120 and 150tha(-1). Native grasses Zoysia japonica and Poa annua were chosen as experimental plants. The experimental results showed that nutrient content of the soil, especially organic matter, was increased after sewage sludge application. The grass biomass was increased and the grass growing season was longer. Heavy metal concentrations in the soil also increased; however, the Zn content did not exceed the stringent Chinese environmental quality standard for soil. Pb and Cu did not exceed the standard for B grade soil, but Cd concentration in soil amended by sewage sludge has exceeded the B grade standard. Therefore, it is suggested that the sewage sludge produced from the wastewater treatment plant should not be applied to farmland, for which B grade soil or better is required. The sludge is suitable for application to forestry and grasslands or nurseries where food chain contamination with cadmium is not a concern.

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    • "Assim, alternativas de destino da grande quantidade de material orgânico gerado devem ser estudadas. O uso agrícola do lodo de esgoto pode ser considerado alternativa de destino, uma vez que em razão do alto teor de matéria orgânica e da presença de alguns nutrientes como N, P e micronutrientes (Bertoncini et al., 2004), seu uso agrícola pode proporcionar melhorias ao solo e aumento na produtividade agrícola (Bovi et al., 2007; Melo et al., 2007; Wang et al., 2008). "
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    ABSTRACT: O uso agrícola de lodo de esgoto e derivados no Estado de São Paulo é regulamentado por norma federal e por norma paulista, que recomendam que esses materiais quando incorporados a solos agrícolas devem apresentar no mínimo 30 % de degradação do carbono total. Para observar as frações de degradação de um lodo de esgoto e de um composto, produzido a partir do mesmo lodo juntamente com poda de árvore urbana triturada, realizaram-se dois ensaios de biodegradação de C. As doses dos resíduos foram adicionadas em frascos contendo 500 g de solo coletado na profundidade de 0,00-0,20 m de um Nitossolo Háplico Álico textura argilosa. No ensaio I, as doses de lodo (L) e composto (C) utilizadas consideraram percentuais da necessidade em N para a cultura da cana-de-açúcar, e expressas em Mg ha-1 de resíduo (base úmida): L1 21,2 (100 %); L2 42,4 (200 %); C1 69,4 (50 %); C2 138,9 (100 %); e C3 277,8 (200 %). O ensaio II foi realizado apenas com o lodo de esgoto, utilizando-se doses 5, 10, 15 e 20 vezes maiores que aquelas recomendadas no ensaio I: L3 120; L4 240; L5 360; e L6 480, simulando sucessivas aplicações do resíduo no solo. O C-CO2 liberado foi quantificado por meio da medida de condutividade elétrica. O lodo de esgoto no ensaio I apresentou menores frações de degradação quando comparado ao composto orgânico, mas a taxa de decomposição do composto foi menor, provavelmente pela presença de substâncias recalcitrantes resultantes do processo de humificação. A fração de degradação dos resíduos no solo atingiu valor próximo a 30 % apenas para a dose de lodo de esgoto 20 vezes superior à dose exigida pela cultura, e assim não poderiam ser utilizados em solos agrícolas argilosos. Observou-se a necessidade de revisão desse valor adotado pela legislação paulista de uso de resíduos orgânicos em solos.
    Full-text · Article · Dec 2015 · Revista Brasileira de Ciência do Solo
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    • "On the other hand, DSS does not pose a threat to crops because of its low content of heavy metals (Fra ˛c et al. 2012), pathogenic bacteria, viruses, parasites and also toxic organic compounds (Antonijevic and Maric 2008; Pascual et al. 2008; Singh and Agrawal 2008; Jezierska-Tys and Fra ˛c 2009). Thus, application of DSS into the field is regarded as proper disposal alternatives (Wang et al. 2008; Fra ˛c and Jezierska-Tys 2011, Gryta et al. 2014), especially in view of the size and growth of the dairy industry and the associated production of large quantities of sewage sludge. Addition of exogenous organic matter to the cropland can lead to an improvement in soil biological functions, depending on the quantity and quality of materials applied. "
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    ABSTRACT: Microbial activity and the diversity of their catabolic potential would be stratified according to soil profile as a result of differing content of soil organic C and they would be altered by applying dairy sewage sludge (DSS) to the surface and subsequently ploughing. We applied 26 Mg ha−1 of DSS and the same nutrient dose of mineral fertilisers as an NPK reference to the soil before sowing winter rape (Brassica napus) in the field experiment. We evaluated the impact of the fertilisers on microbial activity, measured with dehydrogenase and respiratory activity, and diversity of the microbes’ catabolic potential from non-rhizosphere and rhizosphere soil at selected depths. In the surface rhizosphere soil, there were significant increases in microbial catabolic potential (>25 %) and respiratory activity (>20 %) due to DSS application. All of the microbial parameter values in non-rhizosphere soil were higher at 0-20 than at 25-30 cm. These results are important for improving the management approach of diary sewage sludge application to agricultural soils in the context of increasing microbial activity in the soil profile and reducing mineral fertiliser use.
    Preview · Article · Nov 2015 · International journal of Environmental Science and Technology
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    • "Agriculture has become an alternative destination for the sizeable quantities of sewage sludge (SS) generated , due to the presence of plant nutrients in organic waste (Melo et al., 2007; Wang et al., 2008). However, its use can also harm the soil-plant system, due principally to an imbalance in nutrients in this waste (Bertoncini et al., 2004). "
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    ABSTRACT: Sewage sludge (SS) has been widely used as organic fertilizer. However, its continuous use can cause imbalances in soil fertility as well as soil-water-plant system contamination. The study aimed to evaluate possible improvements in the chemical and microbiological characteristics of domestic SS, with low heavy metal contents and pathogens, through the composting process. Two composting piles were set up, based on an initial C/N ratio of 30:1, with successive layers of tree pruning waste and SS. The aeration of piles was performed by mechanical turnover when the temperature rose above 65 ºC. The piles were irrigated when the water content was less than 50 %. Composting was conducted for 120 days. Temperature, moisture
    Full-text · Article · Sep 2015 · Scientia Agricola
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