With the increasing demand for meat (pork) the pig production in China increased over the last years,especially in the Northern East of China around mega cities like Beijing. Increasing pig production in large scale pigfarms head to enormous amounts of organic wastes (such as pig faeces), over-fertilization of agricultural areas andenvironmental pollution in regions with high pig production and density.
Wang M., He C., Ling Y., Liu Y - China Agricultural University
Pig manure can contain pathogens with risksfor animal health, public human health and the environment.Objectives: Composting is biotechnological treatment and a possibility to produce a fertilizer in consideration ofhygienic safety which could be transported to agricultural areas in regions far away from these mega cities. In order toprotect soil and plant quality the agronomic efficiency and hygienic safety of such fertilizer must be demonstrated priorto their application on cultivated fields. The challenge was to determine the sanitation capacity of different variants ofcomposting processes, especially under winter conditions in Beijing (China), and to estimate the microbiological riskfor human health, animal health and the environment.Material and methods: Pig manure and corn stalks were used for composting (ratio 1:7) carried out in small rottingboxes (1m3). The six variants of composting differed in turning interval (no turning, turning once and turning twice aweek) and cover. Two boxes were the same in turning interval, one covered and one uncovered. The composting trialran for ten weeks without forced aeration. As test organism heat resistant strain Salmonella Senftenberg W775 (H2Snegative) (called “W775”) and as indicator organism faecal streptococci were used for microbiological examinations inthe experiment. Mixed input materials were inoculated with a suspension of test organism “W775” and put in sterilesacks. These served as test carriers and were inserted in the rotting boxes in three different positions, representative forparts of the rotting boxes with different risks for hygienic safety. During experiment, qualitative and quantitativeexaminations were carried out to determine the presence of “W775” and faecal streptococci in control and test sampleson day 0, 14, 49 and 70. Data logger were used for temperature measurements on each position of test samples.Temperature, dry matter content and exhaust gas composition were regularly monitored.Main result, brief discussion and conclusion drawn: The numbers of “W775” in the control and starting sample in thebeginning of experiment were 107 cfu/g. The “W775” was not detectable after 14, 49 and 70 days of composting in allof the tested samples. In the positive control samples, stored at room temperature, “W775” was still detectable more orless without any decrease by orders of magnitude over the whole composting period. In regard to the sanitation capacitythe temperature and other influences of composting procedure at each position in every box seem to be sufficient toinactivate the heat resistant strain “W775” in our test samples in all six variants of composting. In conclusioncomposting in this way is a suitable treatment for organic wastes to produce a fertilizer in consideration of hygienicsafety. These fertilizer can be used to export nutrients from areas with high animal density to other regions, far away, with a minimized microbiological risk.
|Copyright:||© European Compost Network ECN e.V.|
|Source:||Orbit 2012 (Juni 2012)|
|Autor:||René A. Eling |
Dr. Werner Philipp
Ludwig E. Hoelzle
|Send Article||Add to shopping cart||Comment article|
Integration einer aeroben Perkolationsstufe mit anschließender Vergärung in das Kompostwerk Göttingen
© Witzenhausen-Institut für Abfall, Umwelt und Energie GmbH (12/2008)
Die ständig knapper werdenden Ressourcen fossiler Energieträger sowie die zunehmenden klimatischen Veränderungen durch deren intensivere Nutzung sind die Triebkraft für das Umdenken in der Energieversorgung. So haben sich in den letzten Jahren vor allem kleinere Anlagen der Energieerzeugung etabliert, die einen entscheidenden Anteil an der Gesamtenergieerzeugung sicherstellen.
Biogaspark Großenlüder: Biomethan- und Düngemittelerzeugung mittels Nass- und Trockenvergärung
© Witzenhausen-Institut für Abfall, Umwelt und Energie GmbH (11/2013)
Die Biothan GmbH ist eine Tochter der RhönEnergie Fulda GmbH, der Gas- und Wasserversorgung Osthessen GmbH sowie der Stadt Fulda. Das Unternehmen wurde im Oktober 2009 mit Sitz in Fulda gegründet. Die Anlage befindet sich in der Gemeinde Großenlüder (Ortsteil Kleinlüder) und wurde auf einem ehemaligen Militärgelände errichtet.
Effect of operating Parameters during compost stability Respiration activity tests
© European Compost Network ECN e.V. (6/2012)
The goal of this work was to assess the effect of various operating parameters (sample size, temperature, air flowrate)during static and dynamic respiration activity tests that are used to assess compost stability. The material used in allexperiments was a MSW compost derived from a commingled MSW composting facility in Athens, Greece. Thefacility receives raw commingled MSW that go through several pre-processing steps, an active in-vessel compostingstep of 18 hr and 6 weeks and a final curing period of 5-6 weeks. Further Authors: D. Kanellos - Democritus University of Thrace C. Kletsas - Democritus University of Thrace
Leakage control of Biogas plants
© European Compost Network ECN e.V. (6/2012)
Anaerobic digestion has become a very important technology to treat organic waste and to generate renewable energy. During construction and operation leaks at biogas plants may occur and methane is emitted. Further Authors: S. Neitzel - Systemtechnik Weser-Ems S. Kohne - esders Ltd
MBT scrubber effluent: Wastewater or fertiliser?
© European Compost Network ECN e.V. (5/2012)
The design of waste air cleaning in Mechanical Biological Treatment (MBT) plants frequently includes acid scrubbing followed by biofiltration. The main purpose of the former process is to remove ammonia from the exhaust air, which produces odours and is toxic for the biofilter microorganisms. The ammonia is then solubilised as ammonium sulphate or ammonium nitrate, according to the acid used in the scrubber (sulphuric or nitric acid, respectively). When the washing solution reaches a preset conductivity, it is partially discharged and replaced by fresh water. As a consequence, an effluent with high ammonia concentration is produced, which is difficult and expensive to treat in a waste water treatment plant. Yet, if we see it in the agronomical perspective, an ammonia rich solution may not be a pollutant but a fertiliser. Further Authors: H. Ribeiro - Technical University of Lisbon D. Catalino - AMARSUL S.A.