Effects Of Biogas Slurry Research Articles

Effects of biogas slurry on hydrothermal carbonization of digestate: Synergistic valorization of hydrochars and aqueous phase

In this study, livestock manure digestate (LMD) was used as feedstock for hydrothermal carbonization (HTC) at different temperature (180–260 °C) and residence time (0–4 h). Nutrient flow and distribution during the HTC process were evaluated by comparing the effects of livestock manure biogas slurry (LBS) and ultrapure water (UW) to determine the optimal reaction conditions for the synergistic production and application of hydrochars (HC) and aqueous phases (AP). Compared with UW, the HC yields derived from LBS as solvent were increased by 27.05–38.24% under the same conditions. The C content, high heating value (HHV), and energy densification of HC obtained from LMD and UW were higher than those obtained from LMD and LBS, and the ash content was lower. While, LBS circumstance improved the porosity, N content and some trace elements e.g. Ca, Fe and Mg in HC that showed excellent fertility potential. In addition, the recovery rate of K, TOC, NH4+-N, and TN concentrations in AP were significantly higher in the LBS circumstance than in UW. The results show that the addition of UW is more favorable for fuel generation, and the HC obtained from LMD and UW at 220 °C has the potential to be used as a fuel. Whereas, the addition of LBS enhanced the potential of HC and AP for agricultural applications simultaneously. It is recommended to use HC and AP obtained from LMD and LBS at 240 °C for using as fertilizer.

Effect of Biogas Slurry on the Soil Properties and Microbial Composition in an Annual Ryegrass-Silage Maize Rotation System over a Five-Year Period.

Soil health is seriously threatened by the overuse of chemical fertilizers in agricultural management. Biogas slurry is often seen as an organic fertilizer resource that is rich in nutrients, and its use has the goal of lowering the amount of chemical fertilizers used while preserving crop yields and soil health. However, the application of continuous biogas slurry has not yet been studied for its long-term impact on soil nutrients and microbial communities in a rotation system of annual ryegrass-silage maize (Zea mays). This study aimed to investigate the impacts on the chemical properties and microbial community of farmland soils to which chemical fertilizer (NPK) (225 kg ha-1), biogas slurry (150 t ha-1), and a combination (49.5 t ha-1 biogas slurry + 150 kg ha-1 chemical fertilizer) were applied for five years. The results indicated that compared to the control group, the long-term application of biogas slurry significantly increased the SOC, TN, AP, and AK values by 45.93%, 39.52%, 174.73%, and 161.54%, respectively; it neutralized acidic soil and increased the soil pH. TN, SOC, pH, and AP are all important environmental factors that influence the structural composition of the soil's bacterial and fungal communities. Chemical fertilizer application significantly increased the diversity of the bacterial community. Variation was observed in the composition of soil bacterial and fungal communities among the different treatments. The structure and diversity of soil microbes are affected by different methods of fertilization; the application of biogas slurry not only increases the contents of soil nutrients but also regulates the soil's bacterial and fungal community structures. Therefore, biogas slurry can serve as a sustainable management measure and offers an alternative to the application of chemical fertilizers for sustainable intensification.

Effects of Biogas Slurry on Crop Yield, Physicochemical Properties and Aggregation Characteristics of Lime Concretion Soil in Wheat–Maize Rotation in the North China Plain

Biogas slurry is a potential sustainable substitute for chemical fertilizers and a soil amendment to restore soil organic matter depletion and structural deterioration. The effects of substituting biogas slurry for chemical fertilizer on a lime concretion soil in the North China Plain were investigated. A field experiment examined the consequences of applying different proportions (0, 25, 50, 75 and 100%) of biogas slurry, while maintaining the same total nitrogen supply, over a period of 5 years. We determined effects on crop yield (winter wheat/summer maize rotation), soil physiochemical properties and aggregation characteristics (using dry- and wet-sieving) in the last experimental year. All fertilizer treatments increased crop yield relative to a control. 50% substitution by biogas slurry gave the highest yield of wheat and maize. Increasing substitution progressively increased soil pH, water holding capacity, organic matter content, total nitrogen content, available phosphorus and potassium contents and C/N ratio; conversely, bulk density declined. Soil aggregate size distribution and stability were improved to varying degrees by biogas slurry substitution, in comparison with chemical fertilizer application alone and unamended control; optimal values for macro-aggregate mass proportion, fractal dimension and percentage of aggregate destruction were achieved with 50% substitution, coinciding with the highest crop yield. Lime concretion black soil was readily amenable to improvement by biogas slurry application, while maintaining optimal crop yields. Its use should be a priority for environmentally coordinated crop production and animal husbandry in this region.

Effect of biogas slurry and sucrose addition on electrokinetic removal of arsenic from paddy soil

Effect of biogas slurry and sucrose addition on electrokinetic removal of arsenic from paddy soil

Pig farm biogas slurry can effectively reduce the pH of saline-alkali soils

ABSTRACT Pig farm biogas slurry is being increasingly used as a potent organic fertilizer for sustainable agriculture under circular economy. However, the effect of biogas slurry on soil pH is currently controversial, and the underlying mechanisms especially in saline-alkali soils are not well understood. A saline-alkali soil (pH = 9.2, EC = 2.0 ms/cm) was selected for soil column (0–50 cm) experiments with (BS) and without (CK) addition of pig farm biogas slurry to investigate the soil pH change and its driving factors. Our results show that the soil pH under CK ranged between 9.1 and 9.5 across different soil depths. Compared to CK, the BS-treated soil had lower pH at 0–20 cm depth and higher pH at 20–30 cm depth (P < 0.01). The soil concentrations were negatively correlated with pH values under BS (P < 0.01), indicating that the oxidation of ammonium mainly contributed to the decrease of soil pH. Interestingly, the anions, such as Cl−, and , were accumulated in the topsoil (0–20 cm) under BS, resulting in the changed correlations of these anions with Na+ when compared to the control. FT-IR and 13C-NMR spectra uncovered that carboxyl, amide C, and total alkyl C groups may be responsible for reducing pH of the saline-alkali soil tested. The soil surface morphology confirmed a much tighter granular aggregate microstructure when mixing the biogas slurry with the soil. Overall, we concluded that from the perspective of soil pH, the utilization of biogas slurry for improving saline-alkali soil is feasible and sustainable.

Nitrogen fertiliser value of biogas slurry and cattle manure for maize (Zea mays L.) production

Recovery of nutrients from biogas slurry (BGS) as a soil amendment, on low input smallholder farms in sub-Saharan Africa, could improve agricultural production and minimize contribution of the agroecosystems to CO2 emissions. Comparative effects of BGS and cattle manure (CM) on maize dry matter, grain yield, uptake of nitrogen (N), phosphorus (P) and potassium (K), and soil total N, extractable P and exchangeable K after harvest were studied, relative to chemical fertiliser (CF). The field experiment was conducted in the 2016/2017 and 2017/2018 growing seasons and was arranged in a randomized complete block design replicated four times with (i) BGS, (ii) CM and (iii) CF as the treatments. Each treatment was applied at 40, 80 and 120 kg Nha−1. Additional P was added to BGS and CM to have the same added P as in the CF treatments. The CM treatment had higher dry matter than both BGS and CF in both seasons at each N rate. Maize grain yield from CF treatment was higher than the two organic fertilisers at each N rate, while the BGS treatment had higher grain yield than CM except at 40 kg Nha−1. When applied at the same N rate, BGS resulted in lower P and K than CF, and had higher extractable P with lower exchangeable K when compared with CM. The findings imply that while BGS provided nutrients, it resulted in lower maize dry matter than CM and lower grain yield than CF, but raised total N and available P, over time.

Short-term effects of selected organic fertilizer sources on carbon dioxide fluxes and soil quality.

Biogas slurry (BGS) has potential as an organic nutrient source, and understanding its effect on carbon (C) exchange in soils is important for clarifying the contribution of organic amendments to soil fertility and the C budget globally. This study evaluated the effect of BGS, cattle manure (CM), and chemical fertilizer (CF) on carbon dioxide (CO2 ) fluxes, microbial biomass C, and β-glucosidase activity during the 2016-2017 and 2017-2018 maize (Zea mays L.) seasons, covering December-May, in South Africa. The experiment was arranged in a randomized complete block design with the treatments as (a) BGS, (b) CM, and (c) CF, applied at 40, 80, and 120kg nitrogen (N) ha-1 . In both seasons, BGS and CM had higher CO2 fluxes than CF. Relative to CM, BGS resulted in higher CO2 flux earlier in the season and lower flux later in the season. The highest CO2 flux was in February but decreased as the season progressed. When expressed as a percentage of organic C present, CO2 fluxes increased with N rate for CM, decreased for BGS, and changed minimally for CF. At maize harvest, the microbial biomass C and β-glucosidase activity were higher in CM than BGS at all N levels tested. These findings imply that relative to CF, applications of BGS and CM increase CO2 fluxes, soil organic C, microbial biomass C, and β-glucosidase activity, and the two organic resources also differ in their contributions to CO2 fluxes, soil organic C, microbial biomass C, and β-glucosidase activity depending on the part of the season, at least in the short term.

Utilization of Bio Slurry with Input of Buffalo Faeces and Water Hyacinth (Eichornia crassipes) With Various Doses of MOD (Microorganism Decomposer) on Productivity of Indigofera zollingeriana.

SAUDARMAN SITANGGANG, 2018: Utilization of Bio Slurry with Input of Buffalo Faeces and Water Hyacinth (Eichornia crassipes) With Various Doses of MOD (Microorganism Decomposer) on Productivity of Indigofera zollingeriana. Guided by NURZAINAH GINTING and YUSUF LEONARD HENUK. The aim of this research was to inventigate the effect of bio gas slurry with the input of buffalo feces and water hyacinth (Eichornia crassipes) with various doses of MOD (Microorganism Decomposer) on Indigofera zollingeriana productivity. This research was conducted in Parbaba Village, Pangururan District, Samosir Regency of North Sumatera from April to November 2017. The design used in this research was split plot design with 4 replications. Factor I dose of MOD, M1 = 1 liter / 150 liters and M2 = 2 liters /150 liters. Factor II dose of bio-slurry fertilizer with input of buffalo feces and water hyacinth parameters, P0 = 0 (as control), P1 = 20, P2 = 40. Were plant height, stems diameter, fresh weight production, and dry weight troduction. The results showed that dosage of MOD gave significant effect on plant height, stem diameter, fresh weight production, and dry matter of Indigofera zollingeriana. The provision of bio gas slurry with buffalo faeces and water hyacinth with various doses of MOD has a significant effect on plant height, stem diameter, fresh weight production, and dry matter. The conclusion of this research that increasing the dose of MOD and fertilization dose of Indigofera zollingeriana gave a better result.

Effects of biogas and raw slurries on grass growth and soil microbial indices

AbstractBiogas slurry is increasingly used as fertilizer. Earlier research was focused on plant growth and soil chemical properties, with only little information available regarding the effects of biogas slurry on soil and root microbial indices. For this reason, a 70 d pot experiment was conducted in which biogas and raw slurries obtained from six biodynamic farms were added to a soil. Italian ryegrass (Lolium multiflorum Lam.) was cultivated to investigate the effects on plant yield, N uptake (two harvests), soil microbial biomass, soil fungi, and root‐colonizing microorganisms. Biogas slurries increased the mean total above‐ground plant biomass by 66% and raw slurries by 35% in comparison to the control. The mean plant N‐uptake increased under biogas and raw slurry application by 166% and 65%, respectively, compared with the unfertilized pots. The effects of biogas and raw slurry application on soil microbial indices were similar except for the lower fungal biomass after biogas slurry amendment. In contrast to biogas slurries, the raw slurries significantly increased microbial biomass C and N by roughly 25% in comparison to the control. The application of biogas slurries significantly decreased the soil ergosterol content in comparison with raw slurry and control treatment, leading to a significantly lower ergosterol : microbial biomass C ratio. In the roots, biogas and raw slurry application significantly decreased the concentrations of the amino sugars galactosamine and glucosamine by 39 and 27%, respectively, but not that of ergosterol in comparison with the control. This was most likely due to a reduced colonization with arbuscular mycorrhizal fungi in the presence of highly available plant nutrients.

Integrated Effect of Organic and Inorganic Fertilizers on Yield, Quality Parameter and Nutrient Availability of Sugarcane in Calcareous Soil

A long term experiment under rice–sugarcane plant–sugarcane ratoon I–sugarcane ratoon II–Moong rotation was started during May, 1993 at Sugarcane Research Institute, Pusa, Bihar to evaluate the long term effect of different levels of nitrogen applied either alone or in combination with organic manures on yield and quality parameter of sugarcane as well as on soil health. The number of tillers, millable cane count, sugarcane and sugar yield were significantly increased at higher level of N when applied with organic manure where as the effect of biogas slurry (BGS) was found more pronounced. Similarly, juice quality was also significantly enhanced at higher N level in conjoint with BGS. The nutrient uptake (N, P, K and Zn) by sugarcane crop was highest in treatment T4 (100 % NPK + 20 t BGS/ha). The bulk density varied from 1.36 to 1.48 g/cm3 and lowest bulk density was found in treatment T8 (100 % NPK + 10 t ST + 10 t SPM/ha) and higher pore space and water holding capacity were also recorded in treatment T8 (100 % NPK + 10 t ST + 10 t SPM/ha). The available N, P and K content in post harvest soil of sugarcane crop was increased with increasing N levels alone or along with organic manures. The correlation between physico-chemical properties of post harvest soil with yield and quality parameters of sugarcane was positive and significant.

Promotion of the Growth and Quality of Chinese Cabbage by Application of Biogas Slurry of Water Hyacinth

Biomass and quality index of Chinese cabbage were investigated under the following treatment, control (CK), 25% biogas slurry + 75% fertilizer (Z-25%), 50% biogas slurry + 50% fertilizer (Z-50%), 75% biogas slurry + 25% fertilizer (Z-75%), and 100% biogas slurry (Z-100%). The results indicated that Z-25% significantly increased shoot height and fresh weight. But shoot height and fresh weight significantly decreased in a time-dependent manner when the concentration of the biogas slurry was greater than 50%. Vitamin C, soluble sugar, protein, and nitrite were measured to evaluate the effect of biogas slurry on the quality of Chinese cabbage. Z-25% treatment could remarkably increased the content of dehydroascorbate (DHA) and total Vc, whereas did not significantly affect reduced ascorbate (AsA) content compared to the CK for 60 d. The content soluble sugar and protein were significantly enhanced under Z-25% treatment. In addition, Z-25% effectively reduced nitrite content in Chinese cabbage. Biogas slurry with concentration more than 50% could not promote quality index of Chinese cabbage. To sum up, biogas slurry of water hyacinth could improve the growth and quality of Chinese cabbage under the optimal applied concentration.

Effect of Biogas Slurry on Biological Properties of Continuous Cropping Cabbage Soil*

Effect of Biogas Slurry on Biological Properties of Continuous Cropping Cabbage Soil*

The Research of Biogas Slurry on Yield and Safety

In this paper, throng studying effect of biogas slurry of different fertilizer rates on wheat yield and some biological traits, found that environmental conditions in the purple, biogas slurry application rate was 3500kg/667m2, wheat yield was maximum; And heavy metals Content in wheat grain would increase with the increasing of biogas slurry application rate, However, compared with conventional chemical fertilizers, the difference was not significant, biogas slurry agricultural would not cause food heavy metal pollution, Wheat planted was in line with food hygiene standards.

Effects of Biogas Slurry Combinated with Urea on Photosynthetic Characteristics and Grain Yield of Winter Wheat

A two-year field experiment was carried out to study the physiological basis of photosynthesis when biogas slurry was jointly applied with urea in wheat(Triticum aestivum L.) and to suggest the proper method for applying biogas slurry.Under the control of total input of nitrogen,the treatments with basal biogas slurry and topdressed urea showed relative high values of PSII potential activity(Fv/Fo),the maximal quantum efficiency of PSII photochemistry(Fv/Fm),photochemical quenching coefficient(qP),electron transport rate(ETR),overall photochemical quantum yield of PSII(ΦPSII),and Pn and low values of non-photochemical quenching coefficient(qN) of flag leaf from heading to maturity of wheat.The best performance of Pn and chlorophyll fluorescence parameters was observed in the treatment of basal biogas slurry(25%) + topdressed urea(75%),which also showed the highest yield of 8 277.90 kg ha-1 and 7 318.07 kg ha-1 in 2007–2008 and 2008–2009.The only application of biogas slurry resulted in poor chlorophyll fluorescence parameters and low Pn because of plant malnutrition,and ultimately a significant lower yield than other treatments.Although the highest Fv/Fo and Fv/Fm were observed in the treatment with urea applied only at heading stage,there were obvious unbalanced chlorophyll fluorescence parameters,such as a continuously low level of qP,a continuously high level of qN,and the unstable ETR and ΦPSII across years.The results suggest that the proper application of biogas slurry in combination with chemical fertilizers may promote grain yield of wheat through optimizing photosynthetic functions,and biogas slurry applied before sowing is better than topdressed at jointing stage.

Effect of biogas slurry and neem oil treated urea sources on rice (Oryza sativa) wheat (Triticum aestivum) cropping system

A field experiment was conducted during the rainy season (kharif) and winter season (rabr) of 1999 2000 and 2000 2001 at New Delhi, to study the effect of biogass slurry (BGS) and neem oil treated urea sources on rice (Oryza sativa L.) wheat (Trticum aestivum L. emend. Fiori. Paol.) cropping system. Except plant height, all the growth and yield attributes of rice such as effective tillerslhill, panicle length, filled grainslpanicle and 1,000 grain weight differed significantly due to different sources of N and their combinations with biogas slurry (BGS). Pusa neem micro emul sion urea 120 (PNME,,,) alone or with BGS in 70:30 gave the significantly higher grain yield of rice compared to prilled urea 120 (PU,,,), BGS,,, and Pusa neem golden urea 120 (PNGU,,,).The PNME,,, also recorded significantly higher apparent N recovery (59.3%) and agronomic efficiency (28.7 kg grainlkg N) compared to rest of sources and their combinations. Also, significantly more total N, P, K uptake was,associated with PNME,,,. Direct application of 60 kg Nlha to wheat significantly increased (16.6%) its grain yield over no nitrogen. Inorganic fertilizers applied to rice did not show significant influence on succeeding wheat crop. Biogas slurry resulted in the higher grain yield (3.97 tonnesl ha) than the control (3.14 tonneslha), prilled urea Q 120 kg Nlha (3.18 tonneslha), Pusa neem golden urea (3.37 tonneslha) and PNME (3.54 tonneslha). However, Pusa neem micro emulsion urea significantly differed with the control, but not with rest of the sources. The PNGU,,, BGS,,, in 50 : 50 ratio resulted in higher grain yield (3.78 tonneslha) than (prilled urea biogas slurry),,, in 70 : 30 ratio, however it remained statistically at par with other com binations.

Effect of biogas slurry on ovarian maturation of common carp

Biogas slurry (BGS) applied at 52·1 litres ha −1 day −1 (6·4% dry matter) resulted in faster maturation of common carp. Fingerlings of Cyprinus carpio communis (Linn.) became fully mature at eight months old in tanks treated with BGS and supplementary feed (SF) and at the ninth month in BGS-treated tanks. The control fish became fully mature during the eleventh month. The fecundity of the fish in tanks treated with BGS+SF was also highest, although the differences among the treatments were statistically non-significant.

Efficacy of biogas slurry in carp, Cyprinus carpio var. communis (Linn.), culture—effects on survival and growth

Effects of biogas slurry, a by-product of biogas plants, on the survival and growth of common carp, Cyprinus carpio var. communis over 270 days of culture were determined. Growth rates of the fish (in terms of weight) were 3·54 times higher in biogas slurry-treated tanks than in controls. Supplementary feeding (with rice bran: groundnut oil-cake, 2:1 at 2% of the body weight) further increased growth rates to 5·70 times higher. Biogas slurry was a better fish pond manure than raw cowdung, for growth rates of common carp in raw cowdung-treated tanks were only 1·18 to 1·24 times higher than in the control. A strong positive correlation existed between length and weight of fish in all treatments.

The solubilization of low-grade rock phosphate with anaerobic digester slurry

The effects of biogas slurry on the solubilization of low-grade rock phosphate was studied by digestion in compost pits. Biogas slurry had solubilizing power for up to 60 days while molasses addition prolonged it throughout a digestion period of 120 days. In this case solubilization reached a maximum of 42.6% of added rock phosphate. Pyrite incorporation depressed drastically the rate of solubilization in spite of decreasing the pH and increasing the citrate-soluble P of the digesting biogas slurry. The concentration of total P increased with increase the loss of organic matter during digestion. The maximum weight loss was recorded in rock phosphate-containing treatment, where release of water-soluble P increased continuously with time and organic P decreased after 30 days of incubation. On the other hand, incorporation of molasses both in presence and absence of pyrite, decreased the water-soluble P but increased the organic P content of the digesting material.