Abstract:ABSTRACT:The potassium ion, present in great amount in the vinasse because it is a monovalent cation, has the characteristic of promoting the dispersion of clay particles, in the same way as the sodium, causing a reduction in the pore space of the soil and, in its turn, reducing its permeability. To evaluate this effect of reduction by application of vinasse to the soil, an experiment was conducted for three different soils, with the objective of evaluating the effect of the application of different doses of v… Show more
“…[25,27] The content of potassium in soils commonly used in the cultivation of sugarcane accounts for less than 5% of the soil's cation exchange capacity (CEC). [15,16,28] Consequently, the application of sugarcane vinasse is an attractive alternative to mineral fertilization, enabling reductions of approximately 50% in the application of synthetic fertilizers in terms of supplying potassium. [29] However, the transportation of vinasse to the agricultural field (either using trucks or pipelines) depends strictly on the radius of economic distribution, [30] which limits the distance from which the transportation of the effluent is economically unfeasible (Fig.…”
Section: Potential Negative Effects Of Fertirrigationmentioning
confidence: 99%
“…Fertirrigation is virtually characterized as the only approach for the management of vinasse in Brazil; there are two main drawbacks of this practice, considering both environmental and energetic aspects. First, although some studies indicate beneficial results from the land disposal of vinasse, [14][15][16] considering short-term applications (i.e., from a few months to two to three years), its continuous disposal in sugarcane crops tends to generate a wide range of negative effects on soils, water resources and crops due to the polluting characteristics of vinasse. [3] Second, the high biodegradable organic content usually found in vinasse characterizes this wastewater as a highly energetic byproduct from the ethanol production chain; thus, fertigation also promotes a bioenergy loss.…”
This paper reports the characterization of the polluting potential of sugarcane vinasse, the main wastewater from ethanol production. Compositional data from vinasse samples collected from sugarcane biorefineries were used to predict negative effects on the soil, water resources and crops potentially associated with fertirrigation, the primary final destination of vinasse in Brazil. High risks of soil salinization were associated with the land disposal of vinasse, as evidenced by the high levels of total dissolved solids (TDS; >4,000 mg L) and electrical conductivity (>6.7 dS m). The high TDS levels coupled with the high biodegradable organic content of vinasse (>14 g L) also favor organic overloading events, leading to local anaerobiosis conditions. Conversely, soil sodification should not be observed in areas fertirrigated with sugarcane vinasse, given the low Na concentrations (<66 mg L) relative to Mg (>145.1 mg L) and Ca (>458.4 mg L) levels. Priority pollutants (Cu, Cr, Ni, Pb and Zn) and phytotoxic elements (Al and Fe) were also found in the analyzed samples; however, relevant environmental impacts should not be associated with these particular constituents. Overall, the relatively simple methodology used herein could efficiently replace massive field data collection to provide a basic understanding of the fate of vinasse in the environment in order to highlight the priority points to be considered in the management of this effluent. In summary, the prompt implementation of treatment plants in distilleries, in addition to a continuous and broad compositional characterization of vinasse, is essential to guarantee its adequate reuse.
“…[25,27] The content of potassium in soils commonly used in the cultivation of sugarcane accounts for less than 5% of the soil's cation exchange capacity (CEC). [15,16,28] Consequently, the application of sugarcane vinasse is an attractive alternative to mineral fertilization, enabling reductions of approximately 50% in the application of synthetic fertilizers in terms of supplying potassium. [29] However, the transportation of vinasse to the agricultural field (either using trucks or pipelines) depends strictly on the radius of economic distribution, [30] which limits the distance from which the transportation of the effluent is economically unfeasible (Fig.…”
Section: Potential Negative Effects Of Fertirrigationmentioning
confidence: 99%
“…Fertirrigation is virtually characterized as the only approach for the management of vinasse in Brazil; there are two main drawbacks of this practice, considering both environmental and energetic aspects. First, although some studies indicate beneficial results from the land disposal of vinasse, [14][15][16] considering short-term applications (i.e., from a few months to two to three years), its continuous disposal in sugarcane crops tends to generate a wide range of negative effects on soils, water resources and crops due to the polluting characteristics of vinasse. [3] Second, the high biodegradable organic content usually found in vinasse characterizes this wastewater as a highly energetic byproduct from the ethanol production chain; thus, fertigation also promotes a bioenergy loss.…”
This paper reports the characterization of the polluting potential of sugarcane vinasse, the main wastewater from ethanol production. Compositional data from vinasse samples collected from sugarcane biorefineries were used to predict negative effects on the soil, water resources and crops potentially associated with fertirrigation, the primary final destination of vinasse in Brazil. High risks of soil salinization were associated with the land disposal of vinasse, as evidenced by the high levels of total dissolved solids (TDS; >4,000 mg L) and electrical conductivity (>6.7 dS m). The high TDS levels coupled with the high biodegradable organic content of vinasse (>14 g L) also favor organic overloading events, leading to local anaerobiosis conditions. Conversely, soil sodification should not be observed in areas fertirrigated with sugarcane vinasse, given the low Na concentrations (<66 mg L) relative to Mg (>145.1 mg L) and Ca (>458.4 mg L) levels. Priority pollutants (Cu, Cr, Ni, Pb and Zn) and phytotoxic elements (Al and Fe) were also found in the analyzed samples; however, relevant environmental impacts should not be associated with these particular constituents. Overall, the relatively simple methodology used herein could efficiently replace massive field data collection to provide a basic understanding of the fate of vinasse in the environment in order to highlight the priority points to be considered in the management of this effluent. In summary, the prompt implementation of treatment plants in distilleries, in addition to a continuous and broad compositional characterization of vinasse, is essential to guarantee its adequate reuse.
“…The incidence of diseases such as brown eye spot and rust in coffee plants is also favored by nutritional imbalance, with very high K contents in soil and plant leaves, due to coffee husk applications (SANTOS et al, 2008). Excessive K + contents in the soil can also promote the dispersion of clay particles, reducing the porosity and affecting other soil physical properties (UYEDA et al, 2013).…”
Coffee processing generates large amounts of husk, which can be used as organic fertilizer if technical criteria are considered. This study investigated the effect of coffee husk, applied to or incorporated into the soil, on soil fertility properties, early crop growth and nutrient accumulation in coffee plants. The experiment analyzed coffee plants in a greenhouse in pots, in randomized blocks, in a 5x2 factorial arrangement plus a control treatment, with four replicates. The treatments consisted of the combination of five coffee husk rates (3.5; 7; 14; 28, and 56 t ha-1), applied in two forms: spread on the surface or incorporated into the soil, plus the control treatment, without husk application. Portions of 7 dm 3 soil were blended with lime, phosphate fertilizer, as well as coffee husk rates in the treatments with residue incorporation, and incubated for 30 days. Thereafter, one coffee seedling per plot was planted, the coffee husk rates were applied on the soil surface for the treatments without residue incorporation, and the plants were left to grow for 180 days. Coffee husk applied to or incorporated into the soil surface increases the K and organic matter contents of the soil, intensifies the early growth of coffee plants and accelerates N and K accumulation in the plant shoots. The application of coffee husk on the surface is more indicated than its incorporation into the soil, and the best rate at coffee planting is equivalent to 20 t ha-1 .
“…Some previous studies has already pointed out that use of vinasse as a fertilizer may have positive consequences for sugarcane crops (BRITO et al ., 2009; JIANG et al ., 2012; UYEDA et al ., 2013; PREVINA & SARAVANAM, 2013; FUESS e GARCIA, 2014), which is its main use nowadays. However, Fuess and Garcia (2014) highlighted some important disadvantages, mostly observed if vinasse is continuously disposed on soil, namely salinization and sodification, organic overloading, permanent acidification of water bodies, interference in the photosynthesis of aquatic plants and inhibition of seed germination.…”
Sugarcane vinasse is an industrial liquid waste generated in great amounts in Brazilian ethanol industries. Nowadays its main use occurs at sugarcane crops, where vinasse is applied as a nutrient source for fertirrigation. However, continued use of vinasse in soil can cause several environmental impacts. So, aiming to provide a more environmentally friendly destination to the effluent, the goal of this work was to investigate the acidogenesis using a synthetic vinasse as substrate, focusing on the effects of initial pH and Chemical Oxygen Demand (COD) on short chain organic acids (SCOAs) concentrations. Synthetic vinasse was prepared at laboratory taking some real sugarcane vinasse composition given in previous works as references. So, major contribution presented here is the investigation on obtaining high added-value SCOAs from a simulated effluent. Cattle manure sludge was utilized as inoculum to promote the conversion of carbohydrate (sucrose, Suc) in synthetic vinasse into SCOAs in batch reactors during a total incubation time of 72 h. Acidogenesis profiles have shown that concentration of lactic acid (HLa) was prevailing among all metabolites, indicating that process followed through an essentially lactic route. Furthermore, considerable concentrations of propionic, acetic and isobutyric acids were also verified at some specific operation times, while solventogenesis was not detected at all. The greatest peak of lactate content was 4.96 g HLa L-1, observed under initial pH 6.0 and 25 g COD L-1, at 16 h. Maximum of lactate productivity was 332.10 g HLa L-1 h-1 at 8 h, associated to a yield of 189.14 g HLa (g Suc)-1, under initial pH 7.5 and 20 g COD L-1.
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