A good way for utilizing municipal sewage sludge is its use on agriculture lands after composting. The fate of sewagesludge is unsolved, its large quantity is cumulated on the territories of sewage cleaning plants. We can solve seriousenvironmental problems with sewage sludge treatment, however there are some risks, since sewage sludge may containheavy metals in high rate.In the Nyírség region of Hungary there are mostly acidic sandy soils with low humus content. Because of the decreasingquantity of livestock manure, the subsequent delivery of organic matter into the soils could be problematic.
Gy. Füleky - Szent István University
Applicationof sewage sludge (compost) in agriculture is very difficult, because the possible great toxic elements content of sludgesand the farmers have to proceed according to stringent lows.Sandy soils are poor in organic and mineral colloids. Long-term use of organic fertilizers could improve this problem,but in a short-term period only the macro- and micro-element content could be supplied. Due to these properties sandysoils have low fertility. To improve all these characteristics we can use composted sewage sludge.Experiment was established in spring, 2003 at the Research Institute of University of Debrecen, in Nyíregyháza city,located at NE part of Hungary and was re-treated in 2006 and 2009. The compost was applied at 9, 18, 27 t ha-1 doses,ploughed into the soil before sowing. Beside the toxic element content of soil, we studied the effect of the appliedcompost on triticale, maize and pea in a small-plot experiment in five replicates. The pH of this light textured sandy soilis 4.58, its humus content is 0.31%. In the composting process some additives such as bentonite, rhyolite and wheatstraw were used, because these materials have good effects on light textured sandy soils, especially with organicmaterial. In this way, the compost contains 40% sewage sludge, 25% straw, 30% rhyolite and 5% bentonite. Ourcompost fills the requirements of the Agricultural Ministry Order of 36/2006 (V.18.).The observed parameters were the followings:
toxic element content (As, Cr, Cu),
the quantity of the yield,
the development of plants.
In the 2008 and 2009 years of the experiment, soil samples were collected twice a year, in April and after harvesting.Samples were sieved to <2 mm, dried at 105 oC and the Cr and Cu concentrations analyses were done after a HNO3-H2O2 digestion by ICP-OES (VARIAN VISTA PRO) and the As concentrations analyses was done by GF-AASequipments. Plant samples were dried at 105oC and were ground before digestion. The measured elements were arsenic(As), chromium (Cr), and copper (Cu).One-way analysis of variance and Tukey’s test were used to determine the effects of treatments on crop yield and onmetal content of plants and soil.Pea accumulated heavy metals in its root but the heavy metal content of seeds was not increased in the treatments andthe values were in the concentration range of crops growing on unpolluted soils. In the case of the other crops treated,there was no or very little increase of the heavy metal content. The results of the metal content stayed under the levelsset in the 50/2001 (IV.3.) Goverment Statute. Any significant effect of sewage sludge compost treatments on Cu, As and Cd content of the soil was not found.
|Copyright:||© European Compost Network ECN e.V.|
|Quelle:||Orbit 2012 (Juni 2012)|
|Preis inkl. MwSt.:||€ 8,00|
|Autor:||Attila Tomócsik |
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Effect of sewage sludge compost application on the potential toxic elements of soil and plant in 2009-2012
© European Compost Network ECN e.V. (6/2014)
In the spring of 2003 we established a small plot experiment with sewage sludge compost that contains 40% sewage sludge, 25% straw, 30% rhyolite and 5% bentonite. In 2006, 2009 and 2012 the experiment was re-treated. We ploughed into the soil 0, 9, 18 and 27 t ha-1 sewage sludge compost in five repetitions. We used spring crops and autumn cereals as corn, pea and triticale in crop rotation. Now we present some potential toxic elements (Co, Cu, Ni and Pb) content of soil samples collected from the 0-30 cm soil layer after harvesting, in 2009-2012.
Co-Combustion of Sewage Sludge in Grate-Based Combustion Plants
© TK Verlag - Fachverlag für Kreislaufwirtschaft (9/2011)
Various feeding systems are available for co-combusting municipal sewage sludge in thermal waste-to-energy plants using grate-based systems. Dried sewage sludge can be fed directly into the refuse pit. Mechanically dewatered sewage sludge is intermediately stored in silos and then conveyed by means of solids pumps to the specific feeding system in the waste chute of the grate-based combustion system or furnace.
Development of local municipal solid waste management in the Western Transdanubia region of Hungary
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
Hungarian municipal solid wastes (MSW) management has developed tremendously over the past 15 years. More than 3,000 landfills and dumps had been closed, just to mention one improvement. However, still, lots of work is necessary to accomplish the EU’s ambitious aim of decreasing landfilling and increasing recycling and composting.
Biopolymerproduktion aus Abwasserströmen für eine kreislauforientierte Siedlungswasserwirtschaft
© Springer Vieweg | Springer Fachmedien Wiesbaden GmbH (6/2020)
In Laborversuchen wurden Primärschlamm, Braunwasser, Schwarzwasser, Brauerei- und Molkereiabwasser anaerob versäuert, um damit kurzkettige organische Säuren zu gewinnen, die als Substrat zur Biopolymerproduktion genutzt werden können. Ausgehend von den Versäuerungsergebnissen der jeweiligen Abwasserströme wurden Potenzialabschätzungen zur Biopolymerproduktionskapazität für Deutschland durchgeführt.
Recycling von metallurgischen Rückständen
© Rhombos Verlag (3/2020)
Schmelzversuche zeigen, wie die Tantalrückgewinnung aus Zinnschlacken und weiteren Reststoffen optimiert werden kann