Increasing the organic matter content of sandy soils using sewage sludge compost
© European Compost Network ECN e.V. (6/2014)
The growing quantity of wastes increases the need for environmentally sound treatment and utilization of these materials. Sewage sludge is a continuously formed organic waste. Its treatment and utilization depend on the quality of the sludge. If it contains high quantity of nutrients and the organic and inorganic toxic materials and elements are present in low quantity, the sewage sludge could be composted and utilized in the agriculture. In our long-term sewage sludge compost experiment 0, 9, 18 and 27 t ha-1 compost is added to the soil in every third year. Compost is made from sewage sludge, straw, rhyolite and bentonite therefore it is suitable for improving the acidic sandy soil in the Nyírség region of Hungary.

Digestate and Compost qualities focus on nitrogen and organic matter respective brings to crops and to cultivated soils
© European Compost Network ECN e.V. (6/2014)
CIRSEE team contributes for Suez Environnement and in collaboration with different public and private partners to the collaborative R&D program DIVA that is partially financed by ANR and that is dedicated to the characterization and agricultural recovery of different digestates produced in France. CIRSEE participates to the task “agronomic characterization” that is led by INRA and realizes different laboratory and “on land” tests in order to precise and compare the agronomic value of different organic products : raw digestates, composted digestates as Methacompost or simple composts produced from domestic or agricultural waste.

Elution experiment on biochar-soil and biochar-compost systems to investigate the leaching dynamics of nutrients and possible toxic components
© European Compost Network ECN e.V. (6/2014)
Nowadays there is no doubt about the negative impact of the fertilizers and chemicals used in agriculture, and it is more and more urgent to increase sustainability by reducing the use of these agrochemicals. It can happen by recycling, reusing organic waste, food industrial by-products and farm organic residues as compost and biochar products. After transformation (pyrolysis and composting) of waste materials we can apply these compost and biochar products as fertilizers or soil improvers. However before agricultural applying we have to make sure of the environmental safety of these products.

Influence of biochar and digestate on pesticide decontamination
© European Compost Network ECN e.V. (6/2014)
To overcome the problem of on farm point pollution originated from cleaning pesticide spaying equippment, easy and cheap on farm biopurification systems are under development. To optimize such systems the combination of soil amended with biochar and/or digestate will be tested. Therefore, a sophisticated sceening procedure based on respiration, degradation, sorption/ desorption, and leaching studies will be performed to identify the most appropriate mixture with respect to different pesticide classes (herbicides, fungicides, and mixtures).

Examination of zinc adsorption capacity of soils treated with differenet pyrolisis products
© European Compost Network ECN e.V. (6/2014)
During pyrolisis the high organic matter content materials (biomass originated organic matter) are heated in oxygen free (or limited amount of oxygen) environment. As a result, the solid phase that remains after eliminating the gases and liquid phase, is more stabile compared to the original product, it cannot be mineralized easily and its utilization is more beneficial in terms of climatic aspects. Furthermore, it can improve the soil structure, it can retain soil moisture and cations in the topsoil for long periods of time that are very important for plants.

Biochar and Compost usage in Farmland for Carbon Sequestration with Mitigating GHG Emission
© European Compost Network ECN e.V. (6/2014)
By using biochar carbonized with biomass materials such as waste wood, bamboo and agricultural materials in farmland, carbon sequestration in the land soil for long period is expected. The analytical method of estimation of undegradable carbon (UDC) amount as follows: The total carbon amount (TOC) and the inorganic carbon (IOC) amount derived from carbonate in the soil of the farmland were measured with the solid sample combustion method.

Improving barley utilization of n and p nutrients from soil amended with bio-digested cattle manure
© European Compost Network ECN e.V. (6/2014)
Anaerobic digestion (AD) of animal manure has become an environmentally attractive technology to meet the world’s increasing demand for energy. Anaerobically digested manure (ADM) is a nitrogen-rich material and its application increases crop yields. We investigate barley response to the application of ADM. Two field sites located in Alberta Canada were used, Lethbridge (Southern) and St. Albert (Central).

Bioremediation of soils contaminated with Bonny light crude oil using Horse manure
© European Compost Network ECN e.V. (6/2014)
Horse manure has appreciable nitrogen content. This made it attractive to be used as organic amendment for tomatoes (Solanum lycopersicum) grown in soils contaminated initially with Bonny light crude oil at 5, 7.5 and 10% (w/w).

Ecological and economic benefits of compost and digestate products
© European Compost Network ECN e.V. (6/2014)
European soils are systematically degrading. The European Soil Strategy urges more attention to the need for organic matter in soil: 45% of the soils in Europe show a lack of organic matter. This is also a problem in Flanders: almost 50% of the soils are below the target of organic matter. A range of measures is necessary for restoring the organic matter content: green manures, crop residues, organic fertilizer and soil improvers will all be needed. It is therefore of great importance that in the future sufficiently high amounts of quality composts and digestate products are produced, because these have shown to be excellent sources of stable organic matter and/or contribute to the soil fertility and food supply.

Technosols manufacturing from sewage sludge to recover degraded soils
© European Compost Network ECN e.V. (6/2014)
The Technosols (TCNS) are “anthropogeomorphic material”, which includes those residues from anthropogenic activities, with similar characteristics to the geological and biogenic components of soils that can act as source material of them through the edaphogenesis processes.

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