Novel K-enriched organomineral fertilizer from sewage sludge-biochar: Chemical, physical and mineralogical characterization

Fachini, Jóisman; Figueiredo, Cícero Célio de; Frazão, Joaquim José; Rosa, Sttela Dellyzete Veiga Franco da; Silva, Juscimar da; Vale, Ailton Teixeira do

doi:10.1016/j.wasman.2021.08.027

Cited by 18 publications

(3 citation statements)

References 60 publications

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“…In this case, further studies should search alternatives to provide K sources together with SSB. Enriching SSB with K and copyrolysis of SS with K-rich raw materials [6] or produce of K-enriched organomineral fertilizer from SSB [18] are some promising technologies.…”

Section: Physical and Chemical Characteristicsmentioning

confidence: 99%

Pyrolysis of Sewage Sludge: Physical, Chemical, Morphological and Mineralogical Transformations

Fachini

Figueiredo

2022

Braz. arch. biol. technol.

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The sewage sludge (SS) use in agriculture has been limited by the Brazilian legislation to a few situations, mainly as a precautionary measure due to inorganic pollutants and pathogens. Thus, a large amount of SS has been accumulated in landfills, with no prospect of use, generating great concern for governments and society. Thermal treatment via pyrolysis has stood out as an option for SS recycling, transforming it into a carbon-rich product known as SS biochar (SSB). Biochar from SS showed good potential to be used for agricultural and environmental purposes. The present study aimed to evaluate the influence of pyrolysis at 300°C on the physical, chemical, morphological and mineralogical characteristics of SSB. In general, pyrolysis increased total carbon, total nitrogen, macro and micronutrient contents, except potassium. Pyrolysis also increased heavy metals (HMs) concentration in SSB. However, HMs values remained below the maximum limits allowed according to the legislation on SS agricultural use. X-ray analysis showed that both SS and SSB present silica (SiO2) as the main mineral. Pyrolysis also increased the SS surface area (SA) and porosity. In general, results of the present study prove showed that pyrolysis is a technological alternative to enable SS use as a sustainable input in agriculture.

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Section: Physical and Chemical Characteristicsmentioning

confidence: 99%

Pyrolysis of Sewage Sludge: Physical, Chemical, Morphological and Mineralogical Transformations

Fachini

Figueiredo

2022

Braz. arch. biol. technol.

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“…Subsequently, when sewage sludge is used as a feedstock for pyrolysis treatment, a sintering process occurs, which completes the chemical stability and relatively low bioavailability of phosphorus. The use of multiple additions and the use of copyrolysis of materials has proven to be an effective option in several cases [13][14][15]. Our experiment aimed at performing a simulation of an Na 2 CO 3 effect on P-extractability from products obtained by the pyrolysis of soda ash with FePO 4 or Al(H 2 PO 4 ) 3 and finding the optimal molar ratio of Na 2 CO 3 and FePO 4 or Al(H 2 PO 4 ) 3 .…”

Section: Chemicals Pyrolysismentioning

confidence: 99%

“…Therefore, suitable sludge modification or pretreatment and co-pyrolysis represent options on how to improve nutrient bioavailability. There have been several studies on sewage sludge pretreatment with CaO [13], MgCl 2 [14], NaCl [14], CaCl 2 [14], KCl [15] and K 2 SO 4 [15], but only limited information on Na 2 CO 3 effects.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Sewage Sludge-Derived Pyrogenic Material as a Promising Soil Amendment

et al. 2022

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The use of advanced treatment technologies such as pyrolysis and carbonization of bio-waste materials has the promise to develop coupled solutions for organic C and P problems in the future of food processing. Sewage sludge-derived pyrogenic materials that are applied to the soil system contain notable levels of P (1–20%). However, only a small portion of total phosphorus is available for plants. Therefore, our study assessed the pretreatment of sewage sludge with Na2CO3 and subsequent pyrolysis at 400 °C and 500 °C for the production of MPCM400 and MPCM500 as potential alternatives for inorganic P fertilizers. Non-pretreated sewage sludge-derived pyrogenic carbonaceous materials (PCM400 and PCM500) were produced as controls. The derived materials obtained by slow pyrolysis at a residence time of 120 min and pyrolysis temperatures of 400 °C and 500 °C, were analyzed by determination of electrical conductivity (EC), pH, elemental analysis of total C, H, N, scanning electron microscopy (SEM) and total concentrations of P, Cd, Fe, Pb and Zn. PCM400, PCM500, MPCM400 and MPCM500 were characterized by analysis of total 16 US-EPA (U.S. Environmental Protection Agency) PAHs by a toluene extraction procedure. Additionally, PCM400, PCM500, MPCM400 and MPCM500 were tested by a germination test with cress seeds (Lepidium sativum L.) and a short-term rye seedling test. Total C concentrations were raised in the order: MPCM500 < MPCM400 < PCM500 < PCM500. Concentration of Σ16 US-EPA PAHs was almost five times higher at PCM500 (21.87 mg/kg) compared to PCM400 (4.38 mg/kg) and three times higher at MPCM500 (23.12 mg/kg) compared to MPCM400 (7.55 mg/kg) with a dominant role of two and three-ring aromatic structures. Total P-concentrations in rye biomass increased in the order for the controls: (2.43 ± 0.95 mg/g) < PCM400 (3.57 ± 0.27 mg/g) < PCM500 (4.04 ± 0.24 mg/g) < MPCM400 (5.23 ± 0.09 mg/g) < MPCM500 (5.57 ± 0.70 mg/g) < IF (7.53 ± 2.65 mg/g). Obtained results showed that pyrolysis materials produced from sewage sludge represent a potential alternative of conventional P inorganic fertilizers and organic C suppliers.

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Sewage Sludge Biochar

Figueiredo

Fachini²,

Araujo³

et al. 2022

Handbook of Waste Biorefinery

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Novel K-enriched organomineral fertilizer from sewage sludge-biochar: Chemical, physical and mineralogical characterization

Cited by 18 publications

References 60 publications

Pyrolysis of Sewage Sludge: Physical, Chemical, Morphological and Mineralogical Transformations

Pyrolysis of Sewage Sludge: Physical, Chemical, Morphological and Mineralogical Transformations

Utilization of Sewage Sludge-Derived Pyrogenic Material as a Promising Soil Amendment

Sewage Sludge Biochar

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